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- W2022362262 abstract "Purpose: To experimentally investigate the variation of CTDIair with radial distance from the scanner isocenter. Method and Materials: Radiation dose measurements were obtained on a Siemens Sensation 16 CT scanner operated with both the head and body beam filtration filters. Measurements were made of CTDIair (mGy/mAs) as a function of the radial distance r from the CT scanner isocenter. The radial profile CTDIair(r) was fit to a third order polynomial which permitted the average CTDI over any radius to be obtained analytically. Results: At r = 8 cm, values of CTDIair relative to the isocenter were 0.824 and 0.838 for the head and body filters, respectively; at r = 16 cm, the values of CTDIair relative to the isocenter were 0.521 and 0.546 for the head and body filters, respectively. Values of CTDIair averaged over an 8 cm radial distance were ∼0.91 × CTDIair(0), and averaged over a 16 cm radial distance were ∼ 0.74 × CTDIair(0). Conclusion: Quantification of variations of CTDIair(r) are of interest because: (a) this parameter quantifies the performance and effectiveness of beam shaping filters; (b) CTDIair data can be used to obtain Tissue Air Ratios that can estimate organ doses in CT." @default.
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- W2022362262 date "2008-06-01" @default.
- W2022362262 modified "2023-09-23" @default.
- W2022362262 title "SU-GG-I-65: The Effect of Measurement Location On In-Air CTDI Values" @default.
- W2022362262 doi "https://doi.org/10.1118/1.2961463" @default.
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