Open AccessValidation of a method for estimating peak skin dose from CT‐guided procedures
Author(s) -
Jones A. Kyle,
Kisiel Meghan E.,
Rong X. John,
Tam Alda L.
Publication year - 2021
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1002/acm2.13261
Subject(s) - scanner , nuclear medicine , limits of agreement , dosimetry , medicine , physics , optics
A method for estimating peak skin dose (PSD) from CTDI vol has been published but not validated. The objective of this study was to validate this method during CT‐guided ablation procedures. Radiochromic film was calibrated and used to measure PSD. Sixty‐eight patients were enrolled in this study, and measured PSD were collected for 46 procedures. CTDI vol stratified by axial and helical scanning was used to calculate an estimate of PSD using the method [1.2 × CTDI vol (helical) + 0.6 × CTDI vol (axial)], and both calculated PSD and total CTDI vol were compared to measured PSD using paired t‐tests on the log‐transformed data and Bland‐Altman analysis. Calculated PSD were significantly different from measured PSD ( P < 0.0001, bias, 18.3%, 95% limits of agreement, −63.0% to 26.4%). Measured PSD were not significantly different from total CTDI vol ( P = 0.27, bias, 3.97%, 95% limits of agreement, −51.6% to 43.7%). Considering that CTDI vol is reported on the console of all CT scanners, is not stratified by axial and helical scanning modes, and is immediately available to the operator during CT‐guided interventional procedures, it may be reasonable to use the scanner‐reported CTDI vol as an indicator of PSD during CT‐guided procedures. However, further validation is required for other models of CT scanner.