Size-specific Dose Estimates for Chest, Abdominal, and Pelvic CT: Effect of Intrapatient Variability in Water-equivalent Diameter

Radiology
Shuai LengCynthia H McCollough

Abstract

To develop software to automatically calculate size-specific dose estimates (SSDEs) and to assess the effect of variations in water-equivalent diameter (Dw) along the z-axis on SSDE for computed tomographic (CT) examinations of the torso. In this institutional review board-approved, HIPAA-compliant, retrospective study, a software program was used to calculate Dw at each image position in 102 consecutive CT examinations of the combined chest, abdomen, and pelvis. SSDE was calculated by multiplying the size-dependent conversion factor and volume CT dose index (CTDIvol) at each image position. The variations in Dw along the z-axis were determined for six hypothetical scanning ranges: chest alone; abdomen alone; pelvis alone; chest and abdomen; abdomen and pelvis; and chest, abdomen, and pelvis. Mean SSDE was calculated in two ways: (a) from the SSDE at each position and (b) from the mean CTDIvol over each scan range and the conversion factor corresponding to Dw at the middle of the scan range. Linear regression analysis was performed to determine the correlation between SSDE values calculated in these two ways. Across patients, for scan ranges 1-6, the mean of the difference between maximal and minimal Dw within a given patient w...Continue Reading

References

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Citations

Jan 20, 2016·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·M GabusiM Paiusco
Apr 8, 2016·Pediatric Radiology·Boaz KarmazynS Gregory Jennings
Jun 23, 2016·Cancer Imaging : the Official Publication of the International Cancer Imaging Society·Monika UhrigHeinz-Peter Schlemmer
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Dec 21, 2017·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Johannes BoosPatric Kröpil
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Oct 12, 2019·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Andrea SteuweJohannes Boos
Oct 6, 2017·Radiation Protection Dosimetry·Akiko IriuchijimaAkio Ogura
Nov 29, 2020·Medical Image Analysis·Jan JuszczykWojciech Wieclawek
Jan 14, 2021·Medical Physics·Benjamin ViggianoTimothy P Szczykutowicz
Dec 29, 2020·Journal of Applied Clinical Medical Physics·Xia JiangRichard D White
Mar 11, 2021·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Colin J MartinChoonsik Lee
Sep 7, 2021·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·S SookpengM R López-González
Aug 25, 2021·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·D M SatharasingheA S Pallewatte

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