Contour maps of normalised scattered radiation doses at different eye heights and positions in an angiography room based on multiple linear regression model

Ahmad Radzi, Halimatussa'Diah and Sohaimi, Norhanna and Md Ralib @ Md Raghib, Ahmad Razali (2023) Contour maps of normalised scattered radiation doses at different eye heights and positions in an angiography room based on multiple linear regression model. Journal of Health Management (JoHM), 20 (2). pp. 59-69. E-ISSN 2948-5126

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Abstract

Background: The phantom study produced contour maps to educate angiography staff on the distributions of scattered radiation to their eyes. Methodology: The scattered radiation came from an upper-body PBU-31 phantom (Kyoto Kagaku) exposed to percutaneous transhepatic biliary drainage technical factors. A total of 48 nanoDots™ (Landauer Inc.) were placed on the paper tubes, corresponding to six positions and eight heights (from 135 cm to 170 cm, with 5 cm increments) of the angiography staff’s eyes from the scattered source. The studied projection and positions were posteroanterior (PA), 25° right anterior oblique (RAO), and 25° left anterior oblique (LAO). The measured doses (mGy) were normalised to the respective dose area product for each exposure (mGym2). The normalised doses (mGy/mGym2) were then transformed to their common logarithmic (log10) form and analysed using a multiple linear regression model. After the analysis, the back transformation was performed, and the contour maps of the results were produced. Results: Linear relationships were observed between log10 normalised scattered radiation doses with eye heights and positions for all projections [F (6,137) = 56.96, p< .001 (PA), F (6,137) = 299.94, p< .001 (25° RAO), F (6,137) = 333.953, p< .001 (25° LAO)]. An increase of 5 cm heights reduced normalised doses by 15.9%, 16.8%, and 6.7% in PA, 25° RAO, and 25° LAO, respectively. In PA projection, 155 cm and above eye heights received lower scattered radiation doses for all positions. Meanwhile, in 25° RAO, the flat panel detector (FD) shielded the position right next to the irradiated area. However, this position received higher scattered radiation doses in 25° LAO. Conclusion: The contour maps differed for each projection, and the distribution of scattered radiation in an angiography room was affected by the shielding of the FD. Manuscript classification: Original research

Item Type:	Article (Journal)
Uncontrolled Keywords:	Keywords: angiography, radiation dosimetry, radiation protection, eye, occupational radiation exposure
Subjects:	Q Science > Q Science (General) R Medicine > R Medicine (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Allied Health Sciences Kulliyyah of Allied Health Sciences > Department of Diagnostic Imaging and Radiotherapy Kulliyyah of Medicine Kulliyyah of Medicine > Department of Radiology
Depositing User:	Halimatussa'diah Ahmad Radzi
Date Deposited:	19 Jan 2024 16:26
Last Modified:	19 Jan 2024 16:27
URI:	http://irep.iium.edu.my/id/eprint/110313

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