title: ASSESSMENT OF EFFECTIVE DOSE FROM CONE BEAM CT IMAGING IN SPECT/CT EXAMINATION IN COMPARISON WITH OTHER MODALITIES.
abstract: The aim of this study was to assess radiation dose from the cone beam computed tomography (CBCT) component of single photon emission tomography/computed tomography (SPECT/CT) examinations and to compare it with the radiopharmaceutical related dose as well as dose from multidetector computed tomography (MDCT). Effective dose (ED) from computed tomography (CT) was estimated using dose-length product values and anatomy-specific conversion factors. The contribution from the SPECT component was evaluated using ED per unit administered activity for the radiopharmaceuticals listed in the International Commission on Radiological Protection Publications 80 and 106. With the exception of cardiac studies (0.11 mSv), the CBCT dose (3.96-6.04 mSv) was similar to that from the radiopharmaceutical accounting for 29-56 % of the total ED from the examination. In comparison with MDCT examinations, the CBCT dose was 48 and 42 % lower for abdomen/pelvis and chest/abdomen/pelvis scans, respectively, while in the chest the CBCT scan resulted in higher dose (23 %). Radiation dose from the CT component should be taken into consideration when evaluating total SPECT/CT patient dose.
authors.affiliation: Department of Diagnostic Radiology, Dalhousie University, 1276 South Park Street, Halifax, NS B3H2Y9, Canada elena.tonkopi@cdha.nshealth.ca.|Department of Diagnostic Imaging, Queen Elizabeth II Health Sciences Centre, 1276 South Park Street, Halifax, NS B3H2Y9, Canada.
authors.forename: Elena
authors.initials: E
authors.lastname: Tonkopi
authors.affiliation: Department of Diagnostic Radiology, Dalhousie University, 1276 South Park Street, Halifax, NS B3H2Y9, Canada.|Department of Diagnostic Imaging, Queen Elizabeth II Health Sciences Centre, 1276 South Park Street, Halifax, NS B3H2Y9, Canada.
authors.forename: Andrew A
authors.initials: AA
authors.lastname: Ross
mesh_terms: D000005:Abdomen / Q000000981:diagnostic imaging*; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D006801:Humans; D061330:Multidetector Computed Tomography / Q000379:methods*; D010388:Pelvis / Q000000981:diagnostic imaging*; D011829:Radiation Dosage; D011835:Radiation Protection; D019275:Radiopharmaceuticals / Q000378:metabolism; D013909:Thorax / Q000000981:diagnostic imaging* / Q000378:metabolism; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods*; D051598:Whole Body Imaging / Q000379:methods*
chemical_list: D019275:Radiopharmaceuticals