Program Information
Computed Tomography Chest and Abdomen Organ Doses Estimation Using a Dose Management Tool
V Tsapaki1*, N Fitousi2 , P Caracappa3 , J Jacobs4 , I Papailiou5 , (1) Konstantopoulio General Hospital, Nea Ionia, Athens, ,(2) Qaelum NV, Leuven, Leuven, (3) Virtual Phantoms Inc, Albany, New York, (4) Qaelum NV, Leuven, Leuven, (5) Konstantopoulio General Hospital, Nea Ionia, Attiki
Presentations
MO-RPM-GePD-I-1 (Monday, July 31, 2017) 3:45 PM - 4:15 PM Room: Imaging ePoster Lounge
Purpose: To estimate organ doses for routine Computed Tomography (CT) chest and abdomen examinations using a radiation dose management tool and to compare the outcome with the implementation of a patient size-specific approach.
Methods: The study was carried out on a Philips Brilliance 64 CT scanner, monitored by an advanced radiation dose management tool (tqm|DOSE, Qaelum, Belgium). The sample included 100 patients (chest and abdomen). In the first part of the study, organ doses were estimated in tqm|DOSE using conversion factors derived from Monte Carlo simulations for a normal-sized model. In the second part, VirtualDoseCT (VDCT) software was used to recalculate organ doses by automatically matching the patient to the closest body sized phantom from a library of 25 anatomically realistic phantoms
Results: The comparison of the two models for normal-sized patients showed dose differences for lung and heart (chest CT) of 16% and 7%, and for liver, kidney and uterus (abdomen CT) of 4%, 17% and 14%, respectively. Average lung dose for chest examinations was 10.78 mGy with tqm|DOSE and 8.94 mGy with VDCT. For other body types, differences could be as high as 60% or more, for organs like thyroid, affected by the scanned length
Conclusion: The tqm|DOSE monitoring platform offers good estimation of organ doses for normal-sized patients. For other body types, a more patient size-specific approach needs to be utilized. Conclusions for this comparison have to be drawn with care, as a small difference in the scanned area could cause great differences in dose
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