Measurement of Scatter Radiation on MDCT Equipment Using an OSL Dosimeter

Tomita, Hironobu; Morozumi, Kunihiko

doi:10.6009/jjrt.kj00003326579

Cited by 10 publications

(5 citation statements)

References 1 publication

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“…The dose distribution of scattered radiation near the gantry was measured using OSLDs during multi-detector row CT (MDCT) procedures within the CT rooms. The maximum dose, H p (10), at 50 cm from the gantry and 150 cm above the floor, was 1.47 mSv/examination [40]. The skin surface dose was measured using RPLDs during CT-guided biopsy procedures for lung cancer [41].…”

Section: Medical Workersmentioning

confidence: 99%

Current situations and discussions in Japan in relation to the new occupational equivalent dose limit for the lens of the eye

et al. 2017

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Since the International Commission on Radiological Protection recommended reducing the occupational equivalent dose limit for the lens of the eye in 2011, there have been extensive discussions in various countries. This paper reviews the current situation in radiation protection of the ocular lens and the discussions on the potential impact of the new lens dose limit in Japan. Topics include historical changes to the lens dose limit, the current situation with occupational lens exposures (e.g., in medical workers, nuclear workers, and Fukushima nuclear power plant workers) and measurements, and the current status of biological studies and epidemiological studies on radiation cataracts. Our focus is on the situation in Japan, but we believe such information sharing will be useful in many other countries.

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Section: Medical Workersmentioning

confidence: 99%

Current situations and discussions in Japan in relation to the new occupational equivalent dose limit for the lens of the eye

et al. 2017

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“…The scattered radiation tended to be lower near the table and right next to the gantry because the scattered radiation was absorbed by the table and the gantry themselves. The studies of Tomita et al (2004) and Miyajima et al (2018) showed that no scattered radiation was detected right next to the gantry.…”

Section: Discussionmentioning

confidence: 99%

“…However, reports on the exposure assessment and radiation protection of medical staff at the time of assistance of CT imaging were less than those for CT fluoroscopy (Suzuki et al 1997, 2001, Iida et al 2002, Tomita and Morozumi 2004, Neeman et al 2006, Heusch et al 2014, Nils et al 2015, Gyekye et al 2016, Fabian et al 2020, Siru et al 2021. During CT scans in the emergency department, medical staff are exposed scattered radiation by assisting CT examinations for various reasons, such as head holding, ventilation, and body movement suppression.…”

Section: Introductionmentioning

confidence: 99%

Usefulness of a lead-acrylic shield for reducing lens dose of assistant in x-ray CT examination

Ito¹,

Matsubara²,

Kobayashi³

et al. 2022

J. Radiol. Prot.

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In CT examinations, the usefulness of protective glasses for reducing lens exposure to assistants has been reported. The present study aimed to compare the dose reduction effect for assistants with lead-acrylic shields and protective glasses (0.07 mmPb, 0.5 mmPb) during CT examination. The air dose distribution in a CT examination room with and without a lead-acrylic shield was compared. It was found that the amount of scattered radiation was significantly reduced by installing a lead-acrylic shield at the CT gantry aperture. Moreover, the reduction rate of air kerma at the assistant's lens was higher using the lead acrylic shield than with the protective glasses—95.7% during head holding and 76.1% during assisted ventilation.

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“…Protective clothing and eyeglasses are also effective in reducing radiation exposure when workers remain in the examination room during CT scans for the purpose of restraining children or patients with a low level of consciousness, or confirming extravascular leakage during contrast injection. 67,68 This will result in unequal exposure, and therefore, 2 personal dosimeters should be attached to the inside of the protective clothing: 1 on the chest (male) or abdomen (female) and 1 on the neck of the outside of the protective clothing. In particular, it is recommended that workers who often remain in the examination room during CT imaging wear protective eyewear and a dedicated lens dosimeter inside the eyewear.…”

Section: B Dose Limit Of the Lensmentioning

confidence: 99%