Reduction of Radiation Exposure to Operator with Radiation Protective Device in ERCP Procedure Using Over-coach X-ray TV System

Hirosawa, Ayaka; Matsubara, Kosuke; Takei, Yasutaka; Kobayashi, Ichiro

doi:10.6009/jjrt.2020_jsrt_76.1.54

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…The response characteristics of OSLDs to scattered radiation have been previously reported by Hirosawa et al and are similar to those of ion chamber dosimeters. 14 McKeever et al 15 reported that OSLDs could measure doses as low as 10 μGy.…”

Section: As Advocated By the International Commission On Radiologicalmentioning

confidence: 99%

Effect of protective glasses on radiation dose to eye lenses during whole breast irradiation

Nakamura

Suzuki

Kato

et al. 2020

J Applied Clin Med Phys

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Objectives The efficacy of radiotherapy for breast cancer has greatly improved owing to better irradiation methods. Radiotherapy aims to deliver therapeutic doses to predetermined target volumes while sparing surrounding healthy tissues. However, there are few reports on radiation exposure to eye lenses, and the recommended exposure limits to ocular lens have been substantially reduced in recent years. This study aimed to investigate the amount of radiation exposure to eye lenses using optically stimulated luminescence dosimeters (OSLDs) and determine whether wearing special protective devices to protect the eyes, as an organ at risk, during whole breast irradiation, is necessary. Methods This experiment used OSLDs on water‐equivalent phantom to measure the change in scattered radiation dose due to the difference of irradiation field while using 4‐ and 6‐MV photons of TrueBeam linear accelerator. Using a total treatment dose of 50 Gy, a target was positioned to approximate the breast, and a plan was formulated to deliver 2 Gy per treatment by tangential irradiation. The mean (SD) irradiation dose at the lens position outside the irradiation field was reported. Results The scattered radiation dose outside the irradiation field was more affected by the irradiation field size than by the radiation energy. The out‐of‐field irradiation dose with a larger field of view was higher than that with a smaller field of view. The use of 0.07‐ and 0.83‐mm‐thick lead shield protective glasses reduced the radiation dose by 56.1% (P < .001) and 55.6% (P < .001), respectively. Conclusions In this experimental model, the amount of radiation the eye was exposed to during whole breast irradiation was determined by the distance of the eye from the radiation field edge and by wearing protective glasses. In clinical practice, the protection offered by eyeglasses may reduce the risk of long‐term side effects and allow the use of higher intensive radiotherapy.

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Section: As Advocated By the International Commission On Radiologicalmentioning

confidence: 99%

Effect of protective glasses on radiation dose to eye lenses during whole breast irradiation

Nakamura

Suzuki

Kato

et al. 2020

J Applied Clin Med Phys

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“…The workspace of an over-couch fluoroscopy system is larger than that of an under-couch one, but more backscattered radiation reaches to the upper bodies of the gastroenterologists and other medical staff members, resulting in a higher radiation dose to the eye lenses than an under-couch one [ 10 , 11 ]. The use of radioprotective curtains in over-couch fluoroscopy systems is highly effective in reducing radiation exposure to physicians and other staff members [ 12 – 14 ]. They consist of hood and four radioprotective sheets, and the hood is placed over the X-ray tube, while the radioprotective sheets are hang down to the surface of the system couch [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of radioprotective curtain length on the scattered dose rate distribution and endoscopist eye lens dose with an over-couch fluoroscopy system

Matsubara,

Nakajima,

Hirosawa

et al. 2024

Phys Eng Sci Med

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Sufficient dose reduction may not be achieved if radioprotective curtains are folded. This study aimed to evaluate the scattered dose rate distribution and physician eye lens dose at different curtain lengths. Using an over-couch fluoroscopy system, dH*(10)/dt was measured using a survey meter 150 cm from the floor at 29 positions in the examination room when the curtain lengths were 0% (no curtain), 50%, 75%, and 100%. The absorbed dose rates in the air at the positions of endoscopist and assistant were calculated using a Monte Carlo simulation by varying the curtain length from 0 to 100%. The air kerma was measured by 10 min fluoroscopy using optically stimulated luminescence dosimeters at the eye surfaces of the endoscopist phantom and the outside and inside of the radioprotective goggles. At curtain lengths of 50%, 75%, and 100%, the ratios of dH*(10)/dt relative to 0% ranged from 80.8 to 104.1%, 10.5 to 61.0%, and 11.8 to 24.8%, respectively. In the simulation, the absorbed dose rates at the endoscopist’s and assistant’s positions changed rapidly between 55 and 75% and 65% and 80% of the curtain length, respectively. At the 0%, 50%, 75%, and 100% curtain lengths, the air kerma at the left eye surface of the endoscopist phantom was 237 ± 29, 271 ± 30, 37.7 ± 7.5, and 33.5 ± 6.1 μGy, respectively. Therefore, a curtain length of 75% or greater is required to achieve a sufficient eye lens dose reduction effect at the position of the endoscopist.

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“…In particular, an over-couch X-ray system provides a higher radiation dose to the eye lenses than an under-couch one [9]. The use of radioprotective curtains in over-couch X-ray systems is highly effective in reducing radiation exposure to physicians and other staff members [10,11]. Radioprotective curtains are often folded during clinical use because they touch the patients and interfere with the procedure.…”

Section: Introductionmentioning

confidence: 99%

Effect of radioprotective curtain length on the scattered dose rate distribution and endoscopist eye lens dose with an over-couch X-ray fluoroscopic system

Matsubara,

Nakajima,

Hirosawa

et al. 2023

Preprint

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Sufficient dose reduction may not be achieved if radioprotective curtains are folded. This study aimed to evaluate the scattered dose rate distribution and physician eye lens dose at different curtain lengths. Using an over-couch X-ray tube fluoroscopic system, dH*(10)/dt was measured using a survey meter 150 cm from the floor at 29 positions in the examination room when the curtain lengths were 0% (no curtain), 50%, 75%, and 100%. The absorbed dose rates in the air at the positions of endoscopist and assistant positions were calculated using a Monte Carlo simulation by varying the curtain length from 0–100%. The air kerma was measured by 10 min fluoroscopy using optically stimulated luminescence dosimeters at the eye surfaces of the endoscopist phantom and the outside and inside of the radioprotective goggles. At curtain lengths of 50%, 75%, and 100%, the ratios of dH*(10)/dt relative to 0% ranged from 80.8–104.1%, 10.5–61.0%, and 11.8–24.8%, respectively. In the simulation, the absorbed dose rates at the endoscopist’s and assistant’s positions changed rapidly between 55% and 75% and 65% and 80% of the curtain length, respectively. At the 0%, 50%, 75%, and 100% curtain lengths, the air kerma at the left eye surface of the endoscopist phantom was 237 ± 29, 271 ± 30, 37.7 ± 7.5, and 33.5 ± 6.1 µGy, respectively. Therefore, a curtain length of 75% or greater is required to achieve a sufficient eye lens dose reduction effect at the position of the endoscopist.

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Reduction of Radiation Exposure to Operator with Radiation Protective Device in ERCP Procedure Using Over-coach X-ray TV System

Cited by 4 publications

References 11 publications

Effect of protective glasses on radiation dose to eye lenses during whole breast irradiation

Effect of protective glasses on radiation dose to eye lenses during whole breast irradiation

Effect of radioprotective curtain length on the scattered dose rate distribution and endoscopist eye lens dose with an over-couch fluoroscopy system

Effect of radioprotective curtain length on the scattered dose rate distribution and endoscopist eye lens dose with an over-couch X-ray fluoroscopic system

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