Radiation dose in chest CT: Assessment of size-specific dose estimates based on water-equivalent correction

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

Abstract

In the setting of thorax Computed Tomography (CT), the main purpose of this work is to quantify differences in Size-Specific Dose Estimate (SSDE), calculated on the basis of both effective diameter and water-equivalent diameter, accounting for patient size and tissue attenuation, respectively. An in-house software was developed to measure water-equivalent diameter and effective diameter on each CT slice, for 133 CT examinations. SSDE was calculated according to the Report of American Association of Physicists in Medicine Task Group (AAPM TG) 204 and 220. The ratio between effective and water-equivalent diameters was studied as function of cross-sectional air-to-body area ratio, for the slice located in the middle of the scan range. When AAPM TG 220 prescriptions were applied, SSDE was mostly found larger than that obtained with AAPM TG 204 recommendations. On average, a difference of about 12% was observed, in spite of a considerable variability (from -18% to 53%). The ratio between effective and water-equivalent diameters ranged from 0.97 to 1.31, with a mean value of 1.15. Moreover, it was found considerably correlated with cross-sectional air-to-body ratio (Pearson's coefficient was 0.78 for women, 0.90 for men). The discrep...Continue Reading

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Citations

Dec 21, 2017·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Johannes BoosPatric Kröpil
Mar 2, 2019·Physics in Medicine and Biology·Abdullah AbuhaimedOmer Demirkaya
Feb 12, 2020·Radiation Protection Dosimetry·Souha GharbiMokhtar Mars
Oct 12, 2019·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Andrea SteuweJohannes Boos
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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