Abstract
It is important to evaluate the radiation eye dose (3 mm dose equivalent, Hp (3)) received by physicians during computed tomography fluoroscopy (CTF)-guided biopsy, as physicians are close to the source of scattered radiation. In this study, we measured the radiation eye dose in Hp (3) received by one physician during CTF in a timeframe of 18 months using a direct eye dosimeter, the DOSIRISTM. The physician placed eye dosimeters above and under their lead (Pb) eyeglasses. We recorded the occupational radiation dose received using a neck dosimeter, gathered CT dose-related parameters (e.g., CT-fluoroscopic acquisition number, CT-fluoroscopic time, and CT-fluoroscopic mAs), and performed a total of 95 procedures during CTF-guided biopsies. We also estimated the eye dose (Hp (3)) received using neck personal dosimeters and CT dose-related parameters. The physician eye doses (right and left side) received in terms of Hp (3) without the use of Pb eyeglasses for 18 months were 2.25 and 2.06 mSv, respectively. The protective effect of the Pb eyeglasses (0.5 mm Pb) on the right and left sides during CTF procedures was 27.8 and 37.5%, respectively. This study proved the existence of significant correlations between the eye and neck dose measurement (right and left sides, R2 = 0.82 and R2 = 0.55, respectively) in physicians. In addition, we found significant correlations between CT-related parameters, such as CT-fluoroscopy mAs, and radiation eye doses (right and left sides, R2 = 0.50 and R2 = 0.52, respectively). The eye dose of Hp (3) received in CTF was underestimated when evaluated using neck dosimeters. Therefore, we suggest that the physician involved in CTF use a direct eye dosimeter such as the DOSIRIS for the accurate evaluation of their eye lens dose.
Highlights
The International Commission on Radiological Protection (ICRP) adopted the new recommendation of reducing the occupational eye lens dose limit from 150 mSv/year to 20 mSv/year, averaged over 5 years—where the maximum dose should not exceed 50 mSv in any year [1]
In Japan, the new eye lens dose limit set by the ICRP was adopted in April 2021
Computed tomography fluoroscopy (CTF) is one of the main methods used in minimally invasive image-guided procedures for the neck, chest, abdomen, and musculoskeletal
Summary
The International Commission on Radiological Protection (ICRP) adopted the new recommendation of reducing the occupational eye lens dose limit from 150 mSv/year to 20 mSv/year, averaged over 5 years—where the maximum dose should not exceed 50 mSv in any year [1]. The International Atomic Energy Agency (IAEA) has embraced this new eye lens dose limit for medical workers [2]. Many countries have used this limit in their regulations. In Japan, the new eye lens dose limit set by the ICRP was adopted in April 2021. It is important to evaluate occupational eye doses and eye protection methods [3–5]. Computed tomography fluoroscopy (CTF) is one of the main methods used in minimally invasive image-guided procedures for the neck, chest, abdomen, and musculoskeletal
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