Radiation doses to the eye lenses of radiologic technologists who assist patients undergoing computed tomography

Suzuki, Akira; Matsubara, Kosuke; Chusin, Thunyarat; Suzuki, Yuko

doi:10.1007/s12194-021-00613-7

Cited by 8 publications

(7 citation statements)

References 23 publications

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“…The reduction rates of Hp(3) to the eye lens by 0.07 mm Pb and 0.5 mm Pb radiation protection glasses were approximately 50% and 75%, respectively. In a previous study that directly measured the lens exposure of CT assistants, the reduction rates of scattered radiation by protective glasses (0.07 mm Pb) were approximately 50%-60% (Nagamoto et al 2021, Suzuki et al 2021. These reports are consistent with the results of our studies.…”

Section: Discussionsupporting

confidence: 92%

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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Section: Discussionsupporting

confidence: 92%

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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“…First, they should have a lens with a higher lead equivalent. The dose reduction rates with Glasses 1 and 2 (0.07 mmPb) were approximately 58% on the right eye surface, which is comparable to previous studies [13,14]. Conversely, the reduction rates with Glasses 3 and 4 (0.50-0.75 mmPb) were approximately 84% on the right eye surface.…”

Section: Discussionsupporting

confidence: 85%

“…Several previous studies about the effects of radioprotective glasses have focused on interventional radiology (IR) physicians [2][3][4][5][6][7][8][9][10][11]; however, only a few studies focused on medical staff assisting patients during computed tomography (CT) examinations [12][13][14]. The staff should stay outside the examination room for good radiation protection practice, but it is not always possible for them due to several reasons such as restraining patient's body movement and assisting ventilation.…”

Section: Introductionmentioning

confidence: 99%

Eye lens dose for medical staff assisting patients during computed tomography: comparison of several types of radioprotective glasses

et al. 2023

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Medical staff sometimes assists patients in the examination room during computed tomography (CT) scans for several purposes. This study aimed to investigate the dose reduction effects of four radioprotective glasses with different lead equivalents and shield shapes. A medical staff phantom was positioned assuming body movement restraint of the patient during chest CT, and air kerma at the eye surfaces of the medical staff phantom and inside the lens of the four types of radioprotective glasses were measured by changing the distance of the staff phantom from the gantry, eye height, and width of the nose pad. The air kerma at the right eye surface with glasses of 0.50–0.75 mmPb and 0.07 mmPb was approximately 83.5% and 58.0%, respectively, lower than that without radioprotective glasses. The air kerma at eye surfaces decreased with all types of glasses by 67.4%–78.2% by increasing the distance from the CT gantry to the staff phantom from 25 cm to 65 cm. The air kerma at the left eye surface was larger except for the glasses with the highest lead equivalent (0.75 mmPb at the front) when the height of the eye lens for the medical staff phantom was higher. The air kerma on the left eye surface decreased by 46.9% with the widest nose pad width compared to the smallest nose pad width for the glasses with adjustable nose pad width. The radioprotective glasses for staff assisting patients during CT examinations should have a large lead equivalent and no gap around the nose and under the front lens.

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“…A small optically stimulated luminescence (OSL) dosimeter, namely, “nanoDot” (Nagase‐Landauer, Ltd.), can obtain H p (0.07). Although this is generally used to confirm skin dose measurements in patients, it can also monitor eye lens exposure because H p (3) can be determined using a conversion factor 22 . Dosimetry services in the USA and Thailand proposed the nanoDot dosimeter to measure eye lens exposure among clinical staff 12 .…”

Section: Methodsmentioning

confidence: 99%

“…Although this is generally used to confirm skin dose measurements in patients, it can also monitor eye lens exposure because H p (3) can be determined using a conversion factor. 22 Dosimetry services in the USA and Thailand proposed the nanoDot dosimeter to measure eye lens exposure among clinical staff. 12 We measured and analyzed the results of nanoDot placed at the eye, neck, chest, and abdomen.…”

Section: Methodsmentioning

confidence: 99%

Determination of a reliable assessment for occupational eye lens dose in nuclear medicine

Miyaji

Miwa

Iimori

et al. 2022

J Applied Clin Med Phys

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The most recent statement published by the International Commission on Radiological Protection describes a reduction in the maximum allowable occupational eye lens dose from 150 to 20 mSv/year (averaged over 5-year periods). Exposing the eye lens to radiation is a concern for nuclear medicine staff who handle radionuclide tracers with various levels of photon energy. This study aimed to define the optimal dosimeter and means of measuring the amount of exposure to which the eye lens is exposed during a routine nuclear medicine practice. A RANDO human phantom attached to Glass Badge and Luminess Badge for body or neck, DOSIRIS and VISION for eyes, and nanoDot for body, neck, and eyes was exposed to 99m Tc, 123 I, and 18 F radionuclides. Sealed syringe sources of each radionuclide were positioned 30 cm from the abdomen of the phantom. Estimated exposure based on measurement conditions (i.e., air kerma rate constants, conversion coefficient, distance, activity, and exposure time) was compared measured dose equivalent of each dosimeter. Differences in body, neck, and eye lens dosimeters were statistically analyzed. The 10-mm dose equivalent significantly differed between the Glass Badge and Luminess Badge for the neck, but these were almost equivalent at the body. The 0.07-mm dose equivalent for the nanoDot dosimeters was greatly overestimated compared to the estimated exposure of 99m Tc and 123 I radionuclides. Measured dose equivalents of exposure significantly differed between the body and eye lens dosimeters with respect to 18 F. Although accurately measuring radiation exposure to the eye lenses of nuclear medicine staff is conventionally monitored using dosimeters worn on the chest or abdomen, eye lens dosimeters that provide a 3-mm dose equivalent near the eye would be a more reliable means of assessing radiation doses in the mixed radiation environment of nuclear medicine.

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Radiation doses to the eye lenses of radiologic technologists who assist patients undergoing computed tomography

Cited by 8 publications

References 23 publications

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

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

Eye lens dose for medical staff assisting patients during computed tomography: comparison of several types of radioprotective glasses

Determination of a reliable assessment for occupational eye lens dose in nuclear medicine

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