Dianna Cody, PhD, DABR, FAAPM Professor & Clinical Operations Director Imaging Physics U.T. M.D. Anderson Cancer Center Houston, TX
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1 Dianna Cody, PhD, DABR, FAAPM Professor & Clinical Operations Director Imaging Physics U.T. M.D. Anderson Cancer Center Houston, TX
2 Learning Objectives: Limitations for estimating patient dose for CT Methods for estimating patient dose for CT Potential future options?
3 What is reported? Volume CT Dose Index (CTDIvol) and Dose Length Product (DLP) Both specific to cylindrical plastic phantom Both are metrics for CT scanner output NOT PATIENT DOSE METRICS McCollough et al. CT Dose Index and Patient Dose: They are NOT the same thing. Radiology 259: , 2011.
4 NOT patient dose? Does not adjust for: Patient SIZE Organs partially irradiated Presence of contrast enhancement Tissue composition (instead of plastic) Energy absorbed by patient (presence or absence of naturally occurring attenuator layer FAT)
5 What do we mean by patient dose? Absorbed dose (energy) by individual subject What about effective dose? Is that dose to a patient? Maybe organ dose would be a better measure?
6 Convert to effective dose k-factor approach (AAPM Report 96) ImPACT CT Dosimetry Tool CT-Expo Commercial dose database packages Research facilities (also organ dose) UCLA [Michael McNitt-Gray] University of Florida [Wes Bolch] Rensselaer Polytechnic Institute [George Xu] Duke [Ehsan Samei and Xiang Li] Others
7 Effective dose definition E(Sv) = [w T x H T (Sv)] w T = tissue weighting factors H T = organ dose Applies to population, NOT individual
8 Effective dose? Specific to standard man size or geometric model May be automatically calculated by database But useful in what context? Population studies Overall practice patterns Protocol quality assurance (outliers)
9 Effective dose? NOT suitable for individual patient histories Only when patient size exactly matches modeling approach used to calculate effective dose Standard Man Durand DJ et al. Utilization strategies for cumulative dose estimates. J Am Coll Radiol 9:480-5, 2012.
10 What would be most useful for our patients??? ORGAN DOSE (relevant to size & scan details) Would help us understand risk to organ systems Would allow more useful cumulative analyses VERY complicated LOTS of values to track MUST be automated!!
11 So what can we do??? AAPM Report 204 Chair: John Boone, Ph.D., FAAPM, FSBI, FACR Size Specific Dose Estimates
12 Conversion Factor 32 cm 120 kvp
13 Conversion Factor 16 cm 120 kvp age in years
14 circle of equal area AP lateral effective diameter
15 ICRU 74 Strauss Boone Fit to All
16 Real-Life Example from pediatric radiologist (July) Goske, et al Diagnostic Reference Ranges for Pediatric Abdominal CT. Radiology 268: , Dose ranges for pediatric CT exams How does the dose delivered in this particular case (5 year old abdomen/pelvis CT) compare to published range???
17 Body Width SSDE (mgy)
18
19 22cm
20 Body Width SSDE (mgy) 11.4 mgy average 7.6 to 13.4 mgy range 25 th - 75 th percentiles
21
22 Report 204 table for 16cm CTDI & Lateral dimension SSDE = CTDI vol x conversion factor SSDE = 2.82 mgy x 0.94 SSDE = 2.65 mgy, or 2.7 mgy
23 Body Width SSDE (mgy) 11.4 mgy average 7.6 to 13.4 mgy range 25 th - 75 th percentile Our case SSDE = 2.7 mgy CLEARLY LOW COMPARED TO THIS RANGE
24 Reaction? Rationale to slowly systematically increase technique on our pediatric exam protocols Currently planning to increase CTDI vol in 25% steps
25 Take home message? SSDE can be hugely helpful in real clinical cases Individual patients can have very unique aspects Be wary of one-size-fits-all approach Think big-picture with dose data base analysis Think customized medicine for individual patient analysis
26 What does new metric mean? SSDE Size corrected CTDIvol DO NOT apply standard k-factors to this value k-factors are based on standard man size Will require some effort to sort out May be similar to average dose in cross-section Organ dose???
27 In Vivo dose comparison to SSDE TLDs attached to enema tip Virtual Colonoscopy CT Exam (no TCM) N=10 patients IRB approved
28 Radiation dose (mgy) TLD vs SSDE Under review, AJR TLD SSDE Anthropomorphic CTDI(vol) Farmer CTDI(vol,c) w/in 10% for 8 of 10 cases Effective patient diameter (cm)
29 Future??? CT Vendors Use information in localizer scan Provide Water Equivalent Diameter (or surrogate) With CTDIvol, provide SSDE automatically For exams using tube current modulation (TCM): Mean SSDE Min & Max SSDE? May need a method for scaling SSDE for specific organ locations (organ dose)
30 SSDE to Organ Dose? CTDIvol for average ma over scan extent Adjust for ma in section of interest Adjust for patient size (SSDE) Result organ dose estimate for tissues in that section Potential for automated calculation of organ dose values
31 But Just because we can, should we? Which patients would this benefit? Younger patients with chronic conditions or stable disease Small proportion of our patients? By the time organ data bases are ready, scanners may deliver tiny exposures Worth the effort and expense? Not sure Over-zealous application of technology?
32 Summary Current metrics not intended for individual patients SSDE provides method for scaling CTDI vol for patient size SSDE may represent average dose at measured cross section May be useful in building organ dose databases Must be automatic and robust for routine clinical use
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