Patient / Organ Dose in CT
|
|
- Kenneth Roberts
- 6 years ago
- Views:
Transcription
1 Patient / Organ Dose in CT Patient specific and organ dose estimation H.D. Nagel Dr. HD Nagel, Science & Technology for Radiology Buchholz / Germany 1
2 Topics CTDI & patient dose SSDE Organ dose estimation Dosimetry software Limitations of organ dose assessment What is organ dose really needed for? How patient-specific must it be? Summary & conclusions. 2
3 CTDI & Patient Dose? Radiology 2011; 259:
4 CTDI vs. Organ Dose Example: Liver dose in upper abdomen scan CT-Expo v2.4 4
5 GSF Phantoms ADAM and EVA ADAM 40 cm x 20 cm d eff = 28.3 cm EVA 37.6 cm x 18.8 cm d eff = 26.6 cm 5
6 Standard CT Dosimetry Phantoms Body phantom 32 cm PMMA CT# = 126 HU WED = 36.0 cm Head phantom 16 cm PMMA CT# = 126 HU WED = 18.0 cm WED = water equivalent diameter 6
7 CTDI vs. Organ Dose 32cm CTDI 36*/28.3** phantom ADAM 40x20=28.3cm = 1.27 = (eff.) 36 cm WED * water equivalent of 32 cm PMMA ** effective diameter of ADAM phantom Differences (ca. 30%) mainly due to male phantom diameter < 36 cm 7
8 SSDE 8
9 SSDE SSDE = CTDI vol corr. factor (d eff ) d eff = d lat d front 16cm PMMA corr. factor = 36cm / deff ADAM ADC reference diameter 32cm PMMA from: AAPM report 204 table 10 9
10 Reference Diameters in CT ADC from: Somatom Definition user manual Reference WED (body range) for average adults in automatic dose control: CareDose 4D (Siemens): 33 cm on average DoseRight (Philips): 33 cm SSDE correction factor = 36/33 = 1.1 CTDI vol under-estimates SSDE for average adults by 10% only. 10
11 Effective Diameters for Children CF=1.5 16cm PMMA CF=1.9 CTDIvol16 ± 20% CF=2.3 from: AAPM report 204 fig. 10 Pädiatric range: CF = 1.9 ± 20% => SSDE = CTDI vol16 ± 20% 11
12 Limitations of SSDE Patient s size varies along the scan range Which diameter is representative? Average, peak or central? Lateral diameter often not accessible Reconstructed FOV generally smaller than patient s cross section Calculation based on a.p. diameter alone presumes constant aspect ratio SSDE based on geometric, not on water equivalent diameter Average CT# of e.g. chest from -100 to -300 HU WED significantly smaller than d eff by 10 to 30% Not necessary for average and obese adults (SSDE CTDI vol ) For pediatrics CTDI vol16 2 CTDI vol32 would do as well Meaningful for slim adults only (or SSDE 1.5 CTDI vol ). 12
13 Organ Dose Estimation Much more complicated than effective dose assessment Huge number of conversion factors required Without appropriate software very time-consuming Which one to use? How user-friendly? How accurate? 13
14 CT Dosimetry Software 14
15 CTDI vs. Organ Dose Scanners: - Elscint CT Twin - Picker PQ GE LightSpeed 16 - Siemens Sensation 16 - Philips Brilliance 16 - Toshiba Aquilion 16 Conditions: kv - 10 mm beam width CTDI100 vs. Organ Dose CT-Expo ImPACT-PDC CTDI300 vs. Organ Dose CT-Expo ImPACT-PDC 0 Liver (Liver) Thyroid Eye Lenses Brain (Neck) (Sinuses) (Brain) Organ / Range Liver (Entire Trunk) 0 Liver (Liver) Thyroid (Neck) Eye Lenses (Sinuses) Organ / Range Brain (Brain) Liver (Entire Trunk) CTDI 100 vs. organ dose CTDI 300 vs. organ dose ADAM/EVA are slim -> differences for average patients even smaller With CTDI 300 significant over-estimation of organ doses. 15
16 CTDI vs. Organ Dose (Head) Scanners: - Elscint CT Twin - Picker PQ GE LightSpeed 16 - Siemens Sensation 16 - Philips Brilliance 16 - Toshiba Aquilion 16 Conditions: kv - 10 mm beam width CTDI 100 vs. organ dose CTDIvol16 organ dose for head scans independent of age group Overestimation of brain doses due to partial shielding by skull. 16
17 CT-Expo - Strengths and Weaknesses Strengths For almost all scanners, regularly updated Excellent assessment of CTDI vol and DLP with corrections for voltage, collimation, effective mas, overbeaming, overranging, z-axis modulation (generic) 3 age groups (adult, child (7 y), baby (8 w)), both genders All relevant dose descriptors Quick assessment of organ and effective doses from CTDI vol and DLP Weaknesses 1 adult size only, 2 pediatric sizes only Mathematical phantom, not voxel-based Gantry tilt, angular and sectorial dose modulation not accounted for. 17
18 CT Dosimetry Software (Mobile) Organ/effective dose + SSDE 13 types of examination Input: CTDI vol, DLP, circumference Organ and effective dose 40 types of examination Input: CTDI vol and DLP only... plus many other apps for ios and Android, often not recommendable. 18
19 CT Dosimetry Software (Web-based) Web-based MC calculation Fast (< 60 s) 9 different patient sizes 2 genders, voxel-based First tests: much left to do few fixed scan ranges only limited number of scanners larger discrepancies in CTDI vol 19
20 Limitations of Organ Dose Assessment Most software tools based on mathematical phantoms Voxel phantom-based solutions often regarded as more realistic Most software solutions based on one patient size only However, differences in organ doses for adults are within ±15% only Individual habitus not taken into account Composition, organ size and location can vary substantially Large uncertainties for organs at or close to the border of scan range Organ dose assessment performed with CALDose_XCT for thorax CT examination ±15% ±15% ±15% Heart Lungs Breasts 20
21 What is Organ Dose Needed for? Comprehensive assessment of organ doses rarely required Only in research studies for organ-based risk estimates Often with poor knowledge of underlying scanners and protocol settings In daily practice for a few purposes only Uterus dose of pregnant women for decision making (abortion of pregnancy) Selected organs for decision making of usefulness of protective devices. 21
22 How much Patient-Specificity? Individual habitus can vary substantially Composition, organ size and location male/178cm 50kg/ BMI 16 male/178cm 75kg/BMI 24 male/178cm 79kg/BMI 25 male/178cm 105kg/BMI 33 Possible solution MC calculation based on individual voxel patient Requires whole body scan with individual segmentation of organs Enormous effort plus additional radiation exposure. 22
23 How much Patient-Specificity? Uterus dose Never an issue (i.e. < 20 msv) if outside scan range Otherwise never above 100 msv Usefulness of protective devices Organ doses for eye lenses, thyroid, breasts, ovaries and testes Coarse estimates sufficient for decision making CT doses limited to stochastic risk in > 99.9% Completely different from therapy planning Risk estimates with uncertainty of factor 1.5 to 2 more than sufficient. 23
24 Summary & Conclusions CTDI vol is a reasonable (±20%) estimate of organ dose In case of average and obese adults and For organs fully inside the scan range SSDE in full detail no big help Pediatrics: CTDI vol16 2 CTDI vol32 does the same within ±20% Slim adults: 1.5 CTDI vol32 does the same within ±20% Software tools useful for organs not fully inside the scan range But subject to larger uncertainties due to patient-specific factors Not much improved when based on multiple voxel phantoms Resulting doses should be regarded as informative only Individual dose assessment Not really needed for assessment of stochastic risks Estimates with correction for 3 sizes (as above) by far sufficient. 24
25 Objection, Your Honor! Radiology 2011; 259:
Doses from Cervical Spine Computed Tomography (CT) examinations in the UK. John Holroyd and Sue Edyvean
Doses from Cervical Spine Computed Tomography (CT) examinations in the UK John Holroyd and Sue Edyvean Why a new dose survey? Number of enquires received concerning the current NDRL Concern that could
More informationRadiation Dosimetry for CT Protocols
Radiation Dosimetry for CT Protocols This document contains radiation dosimetry information from CT scans and can be used by investigators to estimate the dosimetry information required by the JRSC or
More informationState of the art and future development for standardized estimation of organ doses in CT
State of the art and future development for standardized estimation of organ doses in CT March 2015 William J. O Connel, Dr. Ph, Senior Medical Physicist Imagination at work. Agenda Introduction Duke Florida
More informationCT Dose Estimation. John M. Boone, Ph.D., FAAPM, FSBI, FACR Professor and Vice Chair of Radiology. University of California Davis Medical Center
CT Dose Estimation John M. Boone, Ph.D., FAAPM, FSBI, FACR Professor and Vice Chair of Radiology 1 University of California Davis Medical Center CT Dose Estimation Introduction The CTDI Family of Metrics
More informationESTABLISHING DRLs in PEDIATRIC CT. Keith Strauss, MSc, FAAPM, FACR Cincinnati Children s Hospital University of Cincinnati College of Medicine
ESTABLISHING DRLs in PEDIATRIC CT Keith Strauss, MSc, FAAPM, FACR Cincinnati Children s Hospital University of Cincinnati College of Medicine CT Dose Indices CTDI INTRODUCTION CTDI 100, CTDI w, CTDI vol
More informationCURRENT CT DOSE METRICS: MAKING CTDI SIZE-SPECIFIC
CURRENT CT DOSE METRICS: MAKING CTDI SIZE-SPECIFIC Keith Strauss, MSc, FAAPM, FACR Cincinnati Children s Hospital University of Cincinnati College of Medicine Acknowledgments John Boone, PhD Michael McNitt-Grey,
More information8/18/2011. Acknowledgements. Managing Pediatric CT Patient Doses INTRODUCTION
Managing Pediatric CT Patient Doses Keith J. Strauss, MSc, FAAPM, FACR President X-Ray Computations, Inc. Boston, Massachusetts Acknowledgements Marilyn Goske, MD John Boone, PhD Cynthia McCollough, PhD
More informationSOMATOM Drive System Owner Manual Dosimetry and imaging performance report
www.siemens.com/healthcare SOMATOM Drive System Owner Manual Dosimetry and imaging performance report Table of contents 1 Dosimetry and imaging performance report 5 1.1 Dose information 5 1.1.1 General
More informationThoracic examinations with 16, 64, 128 and 256 slices CT: comparison of exposure doses measured with an anthropomorphic phantom and TLD dosimeters
Thoracic examinations with 16, 64, 128 and 256 slices CT: comparison of exposure doses measured with an anthropomorphic phantom and TLD dosimeters Poster No.: C-2584 Congress: ECR 2015 Type: Scientific
More informationNational Cancer Institute
National Cancer Institute A Dosimetry Summary of CT Participants in the National Lung Screening Trial (NLST) U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES National Institutes of Health AAPM 2015 Anaheim,
More informationManaging Radiation Risk in Pediatric CT Imaging
Managing Radiation Risk in Pediatric CT Imaging Mahadevappa Mahesh, MS, PhD, FAAPM, FACR, FACMP, FSCCT. Professor of Radiology and Cardiology Johns Hopkins University School of Medicine Chief Physicist
More informationAccounting for Imaging Dose
Accounting for Imaging Dose High Profile Over-exposures Lead to Growing Concern FDA issues warning in October 2009-209 patients exposed to 8 times typical dose for CT brain perfusion scan (3-4 Gy) - Some
More informationEstimating Patient Radiation Dose from Computed Tomography
Estimating Patient Radiation Dose from Computed Tomography C. Cagnon, J. DeMarco, E. Angel, M. McNitt-Gray UCLA David Geffen School of Medicine 1 Patient Dose from CT Advances in Technology... Helical
More informationWhy is CT Dose of Interest?
Why is CT Dose of Interest? CT usage has increased rapidly in the past decade Compared to other medical imaging CT produces a larger radiation dose. There is direct epidemiological evidence for a an increase
More informationChief Radiographer TEI Clinical Associate 2016
MDCT Principles i and Applications Ε ΑGADAKOS MSc Ε. ΑGADAKOS MSc Chief Radiographer TEI Clinical Associate 2016 Aim To understand d recent technological advances in MSCT and how they can be effectively
More informationIntroduction and Background
CT Lung Cancer Screening and the Medical Physicist: Background, Findings and Participant Dosimetry Summary of the National Lung Screening Trial (NLST) Randell Kruger, PhD, DABR Medical Physics Section
More informationMachine Learning Powered Automatic Organ Classification for Patient Specific Organ Dose Estimation
Machine Learning Powered Automatic Organ Classification for Patient Specific Organ Dose Estimation Junghwan Cho, Eunmi Lee, Hyunkwang Lee, Bob Liu, Xinhua Li, Shahein Tajmir, Dushyant Sahani, and Synho
More informationCalculation of Effective Doses for Radiotherapy Cone-Beam CT and Nuclear Medicine Hawkeye CT Laura Sawyer
Calculation of Effective Doses for Radiotherapy Cone-Beam CT and Nuclear Medicine Hawkeye CT Laura Sawyer Department of Medical Physics and Bioengineering, Royal United Hospital, Bath Overview Varian Acuity
More informationToshiba Aquillion 64 CT Scanner. Phantom Center Periphery Center Periphery Center Periphery
Comparison of radiation dose and imaging performance for the standard Varian x-ray tube and the Richardson Healthcare ALTA750 replacement tube for the Toshiba Aquillion CT scanners. by Robert L. Dixon,
More informationCT Dosimetry in the Clinical Environment: Methods and Analysis
CT Dosimetry in the Clinical Environment: Methods and Analysis Manuel Arreola, Ph.D. DABR Associate Chair of Radiology Director, Medical Physics Graduate Program Department of Radiology University of Florida
More informationDianna Cody, PhD, DABR, FAAPM Professor & Clinical Operations Director Imaging Physics U.T. M.D. Anderson Cancer Center Houston, TX
Dianna Cody, PhD, DABR, FAAPM Professor & Clinical Operations Director Imaging Physics U.T. M.D. Anderson Cancer Center Houston, TX Learning Objectives: Limitations for estimating patient dose for CT Methods
More informationAcknowledgments. A Specific Diagnostic Task: Lung Nodule Detection. A Specific Diagnostic Task: Chest CT Protocols. Chest CT Protocols
Personalization of Pediatric Imaging in Terms of Needed Indication-Based Quality Per Dose Acknowledgments Duke University Medical Center Ehsan Samei, PhD Donald Frush, MD Xiang Li PhD DABR Cleveland Clinic
More informationEstimated Radiation Dose Associated With Low-Dose Chest CT of Average-Size Participants in the National Lung Screening Trial
Medical Physics and Informatics Original Research Larke et al. Estimated Radiation Dose for Low-Dose Chest CT Medical Physics and Informatics Original Research Frederick J. Larke 1 Randell L. Kruger 2
More informationMeasurement of organ dose in abdomen-pelvis CT exam as a function of ma, KV and scanner type by Monte Carlo method
Iran. J. Radiat. Res., 2004; 1(4): 187-194 Measurement of organ dose in abdomen-pelvis CT exam as a function of ma, KV and scanner type by Monte Carlo method M.R. Ay 1, M. Shahriari 2, S. Sarkar 3, P.
More informationCT Optimisation for Paediatric SPECT/CT Examinations. Sarah Bell
CT Optimisation for Paediatric SPECT/CT Examinations Sarah Bell Sarah.bell14@nhs.net Outline 1. Introduction 2. Aims and Objectives 3. Methods 4. Results 5. Discussion 6. Conclusions 7. References Introduction
More informationComputed tomography Acceptance testing and dose measurements
Computed tomography Acceptance testing and dose measurements Jonas Andersson Medical Physicist, Ph.D. Department of Radiation Sciences University Hospital of Norrland, Umeå Sweden Contents The Computed
More informationCT Radiation Dosimetry Study Using Monte Carlo Simulation and. Computational Anthropomorphic Phantoms
CT Radiation Dosimetry Study Using Monte Carlo Simulation and Computational Anthropomorphic Phantoms by Yakun Zhang Graduate Program in Medical Physics Duke University Date: Approved: Ehsan Samei, Supervisor
More informationAutomated CT Protocol Design Advantages and Pitfalls of Algorithm-Based Technique Selection in Pediatrics. Disclosures 7/22/2014. Learning Objectives
Automated CT Protocol Design Advantages and Pitfalls of Algorithm-Based Technique Selection in Pediatrics Robert MacDougall, M.Sc. Department of Radiology Boston Children s Hospital Disclosures 2 Learning
More informationDoses from pediatric CT examinations in Norway Are pediatric scan protocols developed and in daily use?
Doses from pediatric CT examinations in Norway Are pediatric scan protocols developed and in daily use? Eva Godske Friberg * Norwegian Radiation Protection Authority, P.O. Box, Østerås, Norway Abstract.
More informationSPECIFIC PRINCIPLES FOR DOSE REDUCTION IN HEAD CT IMAGING. Rajiv Gupta, MD, PhD Neuroradiology, Massachusetts General Hospital Harvard Medical School
SPECIFIC PRINCIPLES FOR DOSE REDUCTION IN HEAD CT IMAGING Rajiv Gupta, MD, PhD Neuroradiology, Massachusetts General Hospital Harvard Medical School OUTLINE 1 st Presentation: Dose optimization strategies
More informationProf. Dr. Doğan BOR Ankara University Institute of Nuclear Science
PATIENT DOSIMETRY IN DIAGNOSTIC RADIOLOGY MODALITIES Prof. Dr. Doğan BOR Ankara University Institute of Nuclear Science Ankara University Institute of Nuclear Science USE OF RADIATION! INCREASING? Natural
More informationA more accurate method to estimate patient dose during body CT examinations with tube current modulation
A more accurate method to estimate patient dose during body CT examinations with tube current modulation Poster No.: C-0738 Congress: ECR 2014 Type: Scientific Exhibit Authors: A. Kawaguchi 1, Y. Matsunaga
More informationImplementation & optimization of a lung cancer screening CT program. Presented by Izabella Barreto at the 2016 Florida AAPM Chapter Meeting
Implementation & optimization of a lung cancer screening CT program Presented by Izabella Barreto at the 2016 Florida AAPM Chapter Meeting Izabella Barreto, Nathan Quails, Catherine Carranza, Nathalie
More informationAssessment of effective dose in paediatric CT examinations
Assessment of effective dose in paediatric CT examinations E. Dougeni 1,2 CL. Chapple 1, J. Willis 1, G. Panayiotakis 2 1 Regional Medical Physics Department, Freeman Hospital, Freeman Road, Newcastle
More informationRadiation Dose Reduction: Should You Use a Bismuth Breast Shield?
Radiation Dose Reduction: Should You Use a Bismuth Breast Shield? Lincoln L. Berland, M.D., F.A.C.R. Michael V. Yester, Ph.D. University of Alabama at Birmingham Breast Radiation on CT Use of chest CT
More informationTracking Doses in the Pediatric Population
Tracking Doses in the Pediatric Population Frederic H. Fahey DSc Boston Children s Hospital Harvard Medical School frederic.fahey@childrens.harvard.edu Disclosures Sadly, none that pay me any money! SNMMI
More informationPaediatric Dose Reduction and Image Quality
Paediatric Dose Reduction and Image Quality Alan Whiteside The majority of this work was undertaken as part of MSc Thesis of Helen Dixon. Introduction Paediatric CT protocols result in a higher effective
More informationOriginal Article Thoracic Imaging
Original Article Thoracic Imaging https://doi.org/10.3348/kjr.2018.19.6.1179 pissn 1229-6929 eissn 2005-8330 Korean J Radiol 2018;19(6):1179-1186 Size-Specific Dose Estimation In the Korean Lung Cancer
More informationFetal Dose Calculations and Impact on Patient Care
Fetal Dose Calculations and Impact on Patient Care Matt Hough, MS, DABR, DABMP Florida Hospital Diagnostic Medical Physics and Radiation Safety Resource ACR-SPR Practice Parameter for Imaging Pregnant
More informationRadiation Dose Reduction Strategies in Coronary CT Angiography
Radiation Dose Reduction Strategies in Coronary CT Angiography Noor Diyana Osman, PhD noordiyana@usm.my Contents: Introduction Radiation dosimetry in CT Radiation risk associated with coronary CT angiography
More information3/5/2015. Don t Electrocute Me!: Common Misconceptions in Imaging and Radiation Safety (and What to Do About Them)
Don t Electrocute Me!: Common Misconceptions in Imaging and Radiation Safety (and What to Do About Them) Rebecca Milman Marsh, Ph.D. University of Colorado Department of Radiology Who in the Facility Works
More informationTranslating Protocols Across Patient Size: Babies to Bariatric
Translating Protocols Across Patient Size: Babies to Bariatric Cynthia H. McCollough, PhD, FACR, FAAPM Professor of Radiologic Physics Director, CT Clinical Innovation Center Department of Radiology Mayo
More informationAn Update of VirtualDose Software Used for Assessing Patient Organ Doses from CT Examinations
An Update of VirtualDose Software Used for Assessing Patient Organ Doses from CT Examinations Aiping Ding, X. George Xu Rensselaer Polytechnic Institute Troy, NY USA http://rrmdg.rpi.edu 1 Acknowledgements
More informationUltralow Dose Chest CT with MBIR
Ultralow Dose Chest CT with MBIR Ella A. Kazerooni, M.D. Professor & Director Cardiothoracic Radiology Associate Chair for Clinical Affairs University of Michigan Disclosures Consultant: GE Healthcare
More informationCrowd-Sourcing Quality in Imaging
Crowd-Sourcing Quality in Imaging Ricardo S. Avila rick.avila@accumetra.com April 20, 2017 2017 Dialog For Action on Cancer Screening and Prevention Image Quality For Lung Cancer Screening Since 2015:
More informationImage Diagnostic Technology Ltd IDT Ireland, 15 Market Street, Kinsale, Co. Cork, Ireland P17 XN65 Tel: Mob: IRL:
Image Diagnostic Technology Ltd IDT Ireland, 15 Market Street, Kinsale, Co. Cork, Ireland P17 XN65 Tel: +44 20 8819 9158 Mob: +44 7767 366596 IRL: +353 21 470 9501 Web: www.simplantscans.com Email: info@ctscan.co.uk
More informationSkyscan 1076 in vivo scanning: X-ray dosimetry
Skyscan 1076 in vivo scanning: X-ray dosimetry DOSIMETRY OF HIGH RESOLUTION IN VIVO RODENT MICRO-CT IMAGING WITH THE SKYSCAN 1076 An important distinction is drawn between local tissue absorbed dose in
More informationTrue Dual Energy. Dr. Stefan Ulzheimer, Siemens Healthcare GmbH. DEfinitely Siemens
DEfinitely Siemens True Dual Energy Dr. Stefan Ulzheimer, Siemens Healthcare GmbH International version. Not for distribution in the US. Unrestricted Siemens AG 2015 All rights reserved. The products/features
More informationDoses from CT examinations to children suffering from hydrocephalus
Doses from CT examinations to children suffering from hydrocephalus E. G. Friberg 1, L. J. Holmedal 2, I. Børretzen 1, K. Rosendahl 3 and H. M. Olerud 1 1 Norwegian Radiation Protection Authority, P.O.
More informationVarian Edge Experience. Jinkoo Kim, Ph.D Henry Ford Health System
Varian Edge Experience Jinkoo Kim, Ph.D Henry Ford Health System Disclosures I participate in research funded by Varian Medical Systems. Outline of Presentation Review advanced imaging in Varian Edge Linear
More informationAustin Radiological Association Ga-68 NETSPOT (Ga-68 dotatate)
Austin Radiological Association Ga-68 NETSPOT (Ga-68 dotatate) Overview Ga-68 dotatate binds to somatostatin receptors, with highest affinity for subtype 2 receptors (sstr2). It binds to cells that express
More informationAdopting DAP as a dose metric in CT
Adopting DAP as a dose metric in CT Nick Weir Department of Medical Physics Royal Infirmary of Edinburgh NHS Lothian Dose Area Product (DAP) in CT Hypothesis: There are advantages to using DAP: (i) In
More informationManaging Patient Dose in Computed Tomography (CT) INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION
Managing Patient Dose in Computed Tomography (CT) International Commission on Radiological Protection Information abstracted from ICRP Publication 87 Available at www.icrp.org Task Group: M.M. Rehani,
More informationSurvey of patients CT radiation dose in Jiangsu Province
Original Article Page 1 of 6 Survey of patients CT radiation dose in Jiangsu Province Yuanyuan Zhou 1, Chunyong Yang 1, Xingjiang Cao 1, Xiang Du 1, Ningle Yu 1, Xianfeng Zhou 2, Baoli Zhu 1, Jin Wang
More informationPatient Dose Estimates. from CT Examinations. Patient Dose Estimates
Patient Dose Estimates from CT Examinations Patient Dose Estimates from CT Examinations John M. Boone, Ph.D. Professor and Vice Chairman of Radiology Professor of Biomedical Engineering University of California,
More informationIMAGE GENTLY HOW CAN YOU HELP?
IMAGE GENTLY HOW CAN YOU HELP? Keith J. Strauss, MSc, FAAPM, FACR Director, Radiology Physics & Engineering Children s s Hospital Boston Harvard Medical School Acknowledgment Marilyn J. Goske,, MD Robert
More informationAustin Radiological Association Nuclear Medicine Procedure PET SODIUM FLUORIDE BONE SCAN (F-18 NaF)
Austin Radiological Association Nuclear Medicine Procedure PET SODIUM FLUORIDE BONE SCAN (F-18 NaF) Overview Indication Sodium Fluoride F18 injection is a radioactive diagnostic agent for positron emission
More informationAn Assessment of Organ and Effective Dose of Patients who Undertake CT Examinations in two Teaching Hospitals of Mashhad&Isfahan
An Assessment of Organ and Effective Dose of Patients who Undertake CT Examinations in two Teaching Hospitals of Mashhad&Isfahan *M.T.Bahreyni Toossi, **S.Mohandes Dastgherdi Medical Physics Dep., Faculty
More informationRadiation dose and cancer risk estimates in helical CT for pulmonary tuberculosis infections
Open Phys. 2017; 15:769 776 Research Article Bamise Adeleye and Naven Chetty* Radiation dose and cancer risk estimates in helical CT for pulmonary tuberculosis infections https://doi.org/10.1515/phys-2017-0090
More informationAn audit of radiation dose of 4D CT in a radiotherapy department
An audit of radiation dose of 4D CT in a radiotherapy department Poster No.: R-0097 Congress: Type: Authors: Keywords: DOI: 2014 CSM Scientific Exhibit T. Hubbard, J. Callahan, J. Cramb, R. Budd, T. Kron;
More informationTHE UNIVERSITY OF OKLAHOMA HEALTH SCIENCES CENTER GRADUATE COLLEGE RADIATION DOSE ESTIMATION FOR DIAGNOSTIC MODALITIES
THE UNIVERSITY OF OKLAHOMA HEALTH SCIENCES CENTER GRADUATE COLLEGE RADIATION DOSE ESTIMATION FOR DIAGNOSTIC MODALITIES A THESIS SUBMITTED TO THE GRADUATE FACULTY in partial fulfillment of the requirements
More informationCT Radiation Risks and Dose Reduction
CT Radiation Risks and Dose Reduction Walter L. Robinson, M.S. D.A.B.S.N.M., D.A.B.M.P., D.A.B.R. Consultant Certified Medical Radiation Health & Diagnostic Imaging Physicist Medical Radiation and Children
More informationDebra Pennington, MD Director of Imaging Dell Children s Medical Center
Debra Pennington, MD Director of Imaging Dell Children s Medical Center 1 Gray (Gy) is 1 J of radiation energy/ 1 kg matter (physical quantity absorbed dose) Diagnostic imaging doses in mgy (.001 Gy)
More informationFAX, A FEMALE ADULT VOXEL PHANTOM FOR RADIATION PROTECTION DOSIMETRY
EFFECTIVE DOSE RATIOS FOR THE TOMOGRAPHIC MAX AND FAX PHANTOMS ******************************************************** EFFECTIVE DOSE RATIOS FOR TOMOGRAPHIC AND STYLIZED MODELS FROM > EXTERNAL EXPOSURE
More information8/1/2017. Financial Disclosures. Dose Tracking at MGH. How Dose Tracking Affected Protocol Optimization in a Tertiary Quaternary Healthcare Center
How Dose Tracking Affected Protocol Optimization in a Tertiary Quaternary Healthcare Center Mannudeep K. Kalra, MD Webster Center for Quality and Safety Massachusetts General Hospital Harvard Medical School
More informationEFFECTIVENESS OF PROTECTIVE PATIENT EQUIPMENT FOR CT: AN ANTHROPOMORPHIC PHANTOM STUDY Barbara Ott 1, *, Anja Stüssi 2 and Roberto Mini 1
Radiation Protection Dosimetry Advance Access published September 8, 2010 Radiation Protection Dosimetry (2010), pp. 1 9 doi:10.1093/rpd/ncq214 EFFECTIVENESS OF PROTECTIVE PATIENT EQUIPMENT FOR CT: AN
More informationPatient dose assessment of CT perfusion scanning at the RSCH
Patient dose assessment of CT perfusion scanning at the RSCH Lesley Leavesley, Emma Whitehead, Matthew Pryor, Debbie Peet Regional Radiation Protection Service Royal Surrey County Hospital, Guildford Overview
More informationRadiography/Radiology
Radiography/Radiology Activity for 2017 Activity No: A1(17) Topic CT radiation Article CT radiation: key concepts for gentle and wise use Approved for (3) Clinical Continuing Educational Units (CEU s)
More informationImplementation of the 2012 ACR CT QC Manual in a Community Hospital Setting BRUCE E. HASSELQUIST, PH.D., DABR, DABSNM ASPIRUS WAUSAU HOSPITAL
Implementation of the 2012 ACR CT QC Manual in a Community Hospital Setting BRUCE E. HASSELQUIST, PH.D., DABR, DABSNM ASPIRUS WAUSAU HOSPITAL Conflict of Interest Disclaimer Employee of Aspirus Wausau
More informationComputed tomography for pulmonary embolism: scan assessment of a one-year cohort and estimated cancer risk associated with diagnostic irradiation.
Computed tomography for pulmonary embolism: scan assessment of a one-year cohort and estimated cancer risk associated with diagnostic irradiation. Award: Poster No.: E-0004 Certificate of Merit Congress:
More informationEstimating Iodine Concentration from CT Number Enhancement
Estimating Iodine Concentration from CT Number Enhancement Rosemary Eaton, Andrew Shah, Jane Shekhdar Medical Physics, Mount Vernon Hospital CT Users Group 4 th October 212, Edinburgh Summary Background
More informationRegional diagnostic reference levels and collective effective doses from CT scanners in India
Regional diagnostic reference levels and collective effective doses from CT scanners in India Roshan S Livingstone and Paul M Dinakaran Department of Radiology Christian Medical College, Vellore, S India
More informationMedical Physics and Informatics Original Research
Medical Physics and Informatics Original Research Christner et al. Estimating Effective Dose for CT Medical Physics and Informatics Original Research FOCUS ON: Jodie A. Christner 1 James M. Kofler Cynthia
More informationOrgan-Based Dose Current Modulation and Thyroid Shields: Techniques of Radiation Dose Reduction for Neck CT
Medical Physics and Informatics Original Research Hoang et al. Radiation Dose Reduction for Neck CT Medical Physics and Informatics Original Research Jenny K. Hoang 1,2 Terry T. Yoshizumi 1 Kingshuk Roy
More informationDose Reduction Options in Cardiac CT
Dose Reduction Options in Cardiac CT Doyle P, Ball P*, Donnelly P # Radiological Sciences & Imaging, Forster Green Hospital *Department of Radiology, Ulster Hospital # Department of Cardiology, Ulster
More informationWhole Body CT Protocol Update 2018
Whole Body CT Protocol Update 2018 10 th Nordic Course in Trauma Radiology Gothenburg, Sweden K.SHANMUGANATHAN M.D. Disclosure of Commercial Interest Neither I nor my immediate family members have a financial
More informationQuality Control and Patient Dosimetry on line for Computed Tomography
Quality Control and Patient Dosimetry on line for Computed Tomography Jose I. Ten 1,2, Eliseo Vano 2,3, Jose M. Fernandez-Soto 2,3, Roberto Sanchez 3, Juan Arrazola 1,2 1 Diagnostic Radiology Service and
More informationAsk EuroSafe Imaging. Tips & Tricks. Paediatric Imaging Working Group. Shielding in pediatric CT
Ask EuroSafe Imaging Tips & Tricks Paediatric Imaging Working Group Shielding in pediatric CT Claudio Granata (IRCCS Istituto Giannina Gaslini, IT) Joana Santos (ESTeSC-Coimbra Health School, PT) Elina
More informationCTDI versus New AAPM Metrics to assess Doses in CT: a case study
BJRS BRAZILIAN JOURNAL OF RADIATION SCIENCES 04-02 (2016) 01-15 CTDI versus New AAPM Metrics to assess Doses in CT: a case study M. C. S. Campelo a ; M. C. Silva b ; R. A. Terini c a Curso de Física, Pontifícia
More informationOptimizing radiation dose by varying age at pediatric temporal bone CT
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS, VOLUME 16, NUMBER 1, 2015 Optimizing radiation dose by varying age at pediatric temporal bone CT Daichi Noto, 1 Yoshinori Funama, 2a Mika Kitajima, 3 Daisuke
More informationImpact of ICRP-89 Based Models on Dose Estimates for Radiopharmaceuticals and CT Exams. Stabin MG, Kost SD, Clark JH, Pickens DR, Price RR, Carver DE
Impact of ICRP-89 Based Models on Dose Estimates for Radiopharmaceuticals and CT Exams Stabin MG, Kost SD, Clark JH, Pickens DR, Price RR, Carver DE Vanderbilt University, Nashville, TN, USA Abstract New
More informationTo Shield or Not to Shield? Lincoln L. Berland, M.D.
To Shield or Not to Shield? Lincoln L. Berland, M.D. Disclosures Consultant to: Nuance, Inc. Page 2 Breast Radiation on CT Use of chest CT has increased in women vulnerable to cancer induction by radiation.
More informationLow Dose CT Lung Screening: What is Technically Required?
Low Dose CT Lung Screening: What is Technically Required? COMP/CCPM Annual Scientific Meeting Ottawa, Ontario July 15 th, 2017 Yogesh Thakur, PhD, MCCPM Medical Physicist Lead and Regional RSO (X-Ray)
More informationMeasurement of computed tomography dose profile with pitch variation using Gafchromic XR-QA2 and thermoluminescence dosimeter (TLD)
Journal of Physics: Conference Series PAPER OPEN ACCESS Measurement of computed tomography dose profile with pitch variation using Gafchromic XR-QA2 and thermoluminescence dosimeter (TLD) To cite this
More informationCT NUMBER ACCURACY ANALYSIS FOR RADIOTHERAPY TREATMENT PLANNING IMAGING
CT NUMBER ACCURACY ANALYSIS FOR RADIOTHERAPY TREATMENT PLANNING IMAGING Julian Liu a, Keisha Robinson a, DhanaJayan Kothandan a and Joshua Luis b (a) Cancer Centre London (b) University College London
More informationRadiation dose optimization in CT planning of corrective scoliosis surgery. A phantom study.
Radiation dose optimization in CT planning of corrective scoliosis surgery. A phantom study. Abul-Kasim, Kasim; Gunnarsson, Mikael; Maly, Pavel; Ohlin, Acke; Maly Sundgren, Pia Published in: The Neuroradiology
More informationCT Quality Control Manual FAQs
CT Quality Control Manual FAQs General Question: How often will the QC Manual be updated and how will those updates be communicated? Answer: The ACR CT Physics Subcommittee will review any comments, issues
More informationAsk EuroSafe Imaging Tips & Tricks. CT Working Group
Ask EuroSafe Imaging Tips & Tricks CT Working Group Organ Based Tube Current Modulation to Reduce Radiation Dose to Superficial Radiosensitive Organs Eileen Kelly (Galway University Hospitals, IE) Matthias
More informationGATE MONTE CARLO DOSIMETRY SIMULATION OF MARS SPECTRAL CT
GATE MONTE CARLO DOSIMETRY SIMULATION OF MARS SPECTRAL CT R Aamir, C Lowe, J Damet, P Carbonez, A P H Butler, N Schleich, N G Anderson MARFO, Emmanuel Geant4 User Workshop 2017, Wollongong Overview MARS
More informationCT examination is a high-radiation-dose imaging technique
ORIGINAL RESEARCH J.S.P. Tan K.-L. Tan J.C.L. Lee C.-M. Wan J.-L. Leong L.-L. Chan Comparison of Eye Lens Dose on Neuroimaging Protocols between 16- and 64-Section Multidetector CT: Achieving the Lowest
More informationA multicentric study on patient dose in multislice CT
A multicentric study on patient dose in multislice CT A.Stratis 1, M.Molfetas 1, S.Kottou 2, A.Louizi 2 1. Medical Physics department, Evangelismos General hospital of Athens, Athens, Greece 2. Medical
More informationPatient Radiation Doses from Adult and Pediatric CT
Radiation Doses from CT CT Imaging Original Research Walter Huda 1 Awais Vance 1,2 Huda W, Vance A Keywords: MDCT, pediatric CT, physics of radiology, radiation dose DOI:.2214/AJR.06.01 Received January
More informationUsing body mass index to estimate individualised patient radiation dose in abdominal computed tomography
O Neill et al. European Radiology Experimental (2018) 2:38 https://doi.org/10.1186/s41747-018-0070-5 European Radiology Experimental ORIGINAL ARTICLE Using body mass index to estimate individualised patient
More informationBone Densitometry Radiation dose: what you need to know
Bone Densitometry Radiation dose: what you need to know John Damilakis, PhD Associate Professor and Chairman University of Crete, Iraklion, Crete, GREECE Estimation of bone status using X-rays Assessment
More informationAmerican College of Radiology CT Accreditation Program. Testing Instructions
American College of Radiology CT Accreditation Program Testing Instructions (Revised January 6, 2017) This guide provides all of the instructions necessary for clinical tests, phantom tests and general
More informationRadiation Dose To Pediatric Patients in Computed Tomography in Sudan
Radiation Dose To Pediatric Patients in Computed Tomography in Sudan Omer Osman,Saeed Medical Physics Department, ALNeelain University, Sudan Presentation outlines Introduction Objectives Materials and
More informationReducing Radiation Dose in Body CT: A Primer on Dose Metrics and Key CT Technical Parameters
Medical Physics and Informatics Review Maldjian and Goldman Reducing Radiation Dose in Body CT Medical Physics and Informatics Review FOCUS ON: Pierre D. Maldjian 1 Alice R. Goldman Maldjian PD, Goldman
More informationStudies in both the United States and Europe have revealed that computed tomographic (CT) examinations account for only up to 15% of all imaging exami
Note: This copy is for your personal non-commercial use only. To order presentation-ready copies for distribution to your colleagues or clients, contact us at www.rsna.org/rsnarights. Alice B. Smith, MD
More informationMultislice CT versus cone beam CT: dosimetric and image quality comparision.
Multislice CT versus cone beam CT: dosimetric and image quality comparision. Poster No.: C-2589 Congress: ECR 2015 Type: Authors: Scientific Exhibit C. Dionisi 1, A. Crispo 2, E. Stefani 3, A. Lovaglio
More informationCT dose survey data acquisition form
CT dose survey data acquisition form CT Protocol page CT Head (acute stroke) C-spine (fracture) Chest (lung cancer) Chest High-Res. (interstitial lung disease) CTA (blood vessels) CTPA (PE) Abdomen (liver
More information