Multislice CT versus cone beam CT: dosimetric and image quality comparision.
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1 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 2 ; 1 Treviso/IT, 2 Matera/IT, 3 Miane/IT Keywords: DOI: Dosimetry, CT, Radioprotection / Radiation dose, Quality assurance /ecr2015/C-2589 Any information contained in this pdf file is automatically generated from digital material submitted to EPOS by third parties in the form of scientific presentations. References to any names, marks, products, or services of third parties or hypertext links to thirdparty sites or information are provided solely as a convenience to you and do not in any way constitute or imply ECR's endorsement, sponsorship or recommendation of the third party, information, product or service. ECR is not responsible for the content of these pages and does not make any representations regarding the content or accuracy of material in this file. As per copyright regulations, any unauthorised use of the material or parts thereof as well as commercial reproduction or multiple distribution by any traditional or electronically based reproduction/publication method ist strictly prohibited. You agree to defend, indemnify, and hold ECR harmless from and against any and all claims, damages, costs, and expenses, including attorneys' fees, arising from or related to your use of these pages. Please note: Links to movies, ppt slideshows and any other multimedia files are not available in the pdf version of presentations. Page 1 of 6
2 Aims and objectives To respect the principle of optimization It is necessary to keep abreast of new technologies and compare them to those used at the time to check the actual benefits. The aim of the study is the comparison of image quality and effective doses of conebeam computed tomography for maxillofacial applications and multi-slices computed tomography. Methods and materials The effective doses of Planmeca ProMax 3D CBCT were calculated and then compared to those of equivalent protocols for Siemens Sensation 64 MSCT. In order to reduce casual errors, all measurements have been repeated for three times. Both dental arches have been acquired simultaneously or individually. The protocol used for MSCT used 120Kv, 90mAs, Rotation Time 1sec, Pitch 0.8, detector configuration 64x0.6. The protocol for CBCT provided for the acquisition of three 8x8 volumes with 90kV, 7.1mA, acquisition time 12sec. The doses of the two systems were calculated using a PMMA head phantom and two ionization chambers of 10 and 12cm, respectively for MSCT and CBCT measurements. In agreement with Sedentex guidelines and recommendations of ICRP, the effective dose for CBCT system was calculated using DAP, while for MSCT using common dose indices (CTDI and DLP). DAP has been used because the doses erogated by CBCT systems were overestimated if common dose indices and DLP were used. Conversion to the effective dose from DLP has been done using the k value indicated in ''EUR EN 16262" equal to msv/mgy*cm, and from DAP the k value published from NRPB-R msv/gy*cm2. As far as image quality is concerned, the MTF has been calculated for MSCT and CBCT using phantoms and software equipped by the manufacturer. Results The dose values for CBCT ranged from 13.8 to 199.8µSv, while the MSCT ones ranged from to µSv. The CBCT values are referred to the acquisition of three different volumes. Three protocols have been used: the first one is referred to the acquisition of both dental arches, considering an acquisition length of 15 cm; the second one is referred to the acquisition of the superior arch and measures 5 cm; the third protocol is referred just to the acquisition of the inferior arch and It is 6 cm long. The minimum values, 13.8 and µsv, are referred to the acquisition of the superior Page 2 of 6
3 arch, while the maximum values, and µsv, are referred to the simultaneous acquisition of both dental arches. CBCT values are referred to the acquisition of both dental arches. A "three-horizontal protocol" has been used: It provided three 8x8 cm horizontally-combined volumes. In order to make acquisition results of the superior and the inferior arches individually, a 8x5 cm and a 8x6 cm fields have been used. The values at 10% and 50%, of MTF were calculated considering acquisition with a normal resolution and are respectively 2.5 and 0.72pl/mm for CBCT, 9.8 and 5.2pl/mm for MSCT. Images for this section: Fig. 1 Page 3 of 6
4 Fig. 2 Fig. 3: MTF MSCT Page 4 of 6
5 Fig. 4: MTF curve referred to CBCT system Page 5 of 6
6 Conclusion The doses obtained with CBCT are from 3 to 17 times lower than those obtained with MSCT. The maximum dose saving has been obtained for the acquisition of the single inferior arch. Optimizing even more protocols, the difference increases considerably. The image quality, although the ProMax system have a spatial resolution at 50% of about 7 times lower than MSCT, is clinically valid. For these reasons, the use of CBCT appears to be more suitable than the MSCT. Personal information References Loubele M. Comparision between effective radiation dose of CBCT and MSCT scanners for dentomaxillofacial applications Ludlow JB and Ivanovic M. Comparative dosimetry of dental CBCT devices and 64-slices CT for oral and maxillofacial radiology Kai H. Lee, Ph.D.. CT Radiation dose: monitoring and reporting Sangroh Kim. Computed tomography dose index and dose length product for cone-beam CT: Monte Carlo simulations of a commercial system. November J. Xu. Technical assessment of a cone-beam CT scanner for otolaryngology imaging: Image quality, dose, and technique protocols. 25 July J.R.Holroyd & A.D. Gulson. The radiation protection implication of the use of cone beam computed tomography in dentistry - what you need to know. July Paola Colombo. Tomogrfia Computerizzata: descrizione e misura dei parametri caratteristici. Report AIFM, Report of AAPM. Comprehensive Methodology for the Evaluation of Radiation Dose in X- Ray Computed Tomogra Radiation protection: cone beam CT for dental and maxillofacial radioloy. Evidence Based Guidelines. Sedentex CT, phy. February C.H. Clement. Radiological protection in cone beam computed tomography. ICRP, 17 june Page 6 of 6
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