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Investigation of Eye Lens Dose Estimate based on AAPM Report 293 in Head Computed Tomography.
- Source :
- Journal of Biomedical Physics & Engineering; Oct2021, Vol. 11 Issue 5, p563-572, 10p
- Publication Year :
- 2021
-
Abstract
- Background: Estimation of eye lens dose is important in head computed tomography (CT) examination since the eye lens is a sensitive organ to ionizing radiation. Objective: The purpose of this study is to compare estimations of eye lens dose in head CT examinations using local size-specific dose estimate (SSDE) based on size-conversion factors of the American Association of Physicists in Medicine (AAPM) Report No. 293 with those based on size-conversion factors of the AAPM Report No. 220. Material and Methods: This experimental study is conducted on a group of patients who had undergone nasopharyngeal CT examination. Due to the longitudinal (z-axis) dose fluctuation, the average global SSDE and average local SSDE (i.e. particular slices where the eyes are located) were investigated. All estimates were compared to the measurement results using thermo-luminescent dosimeters (TLDs). The estimated and measured doses were implemented for 14 patients undergoing nasopharyngeal CT examination. Results: It was found that the percentage differences of the volume CT dose index (CTDI<subscript>vol</subscript>), average global SSDE based on AAPM No. 220 (SSDE<subscript>o,g</subscript>), average local SSDE based on AAPM No. 220 (SSDE<subscript>o,l</subscript>), average global SSDE based on AAPM No. 293 (SSDE<subscript>n,g</subscript>) and average local SSDE based on AAPM No. 293 (SSDE<subscript>n,l</subscript>) against the measured TLD doses were 22.5, 21.7, 15.0, 9.3, and 2.1%, respectively. All comparisons between dose estimates and TLD measurements gave p-values less than 0.001, except for SSDE<subscript>n,l</subscript> (p-value = 0.566). Conclusion: SSDE based on AAPM Report No. 293 can be used to accurately estimate eye lens radiation doses by performing the calculations on a number of specific slices containing the eyes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 22517200
- Volume :
- 11
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Journal of Biomedical Physics & Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 152810174
- Full Text :
- https://doi.org/10.31661/jbpe.v0i0.2104-1304