Eye lens dose levels in interventional rooms using simple phantom simulation, dose management software and Monte Carlo method of uncertainty assessment

Bayón, José; Alejo, Luis; Koren, C.; Huerga, C.; Corredoira, E.; Serrada, A.; Balbacid, Enrique; Gutiérrez-Larraya, Federico; Guibelalde, E.

doi:10.1016/j.apradiso.2018.08.014

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…Plot point (B) shows the calibration factor of incident x‐rays which were scattered by the patient, and was 3% smaller than the vendor‐supplied calibration factor. It was reported that the energy of scattered x‐rays was changed by <10 keV from that found in the previous research 17,29 . In the specific case of this study, the effective energy of the scattered x‐ray spectrum being incident to the eye lens [related to point (B)] is similar to that of 80 kV [related to point (A)].…”

Section: Resultssupporting

confidence: 51%

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Evaluation of calibration factor of OSLD toward eye lens exposure dose measurement of medical staff during IVR

Asahara

Hayashi

Goto

et al. 2020

J Applied Clin Med Phys

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The eye lens is a sensitive organ of which an x-ray exposure dose should be managed during interventional radiology (IVR). In the actual situations, the eye lens is exposed to scattered x-rays; they have different from the standard x-ray energies which are used for general dose calibration of the dosimeter. To perform precise dose measurement, the energy dependence of the dosimeter should be properly accounted for when calibrating the dosimeter. The vendor supplies a calibration factor using 80-kV diagnostic x-rays under a free-air condition. However, whether it is possible to use this calibration factor to evaluate the air kerma during the evaluation of the eye lens dose is unclear. In this paper, we aim to precisely determine calibration factors, and also examine the possible application of using a vendor-supplied calibration factor. First, the x-ray spectrum at the eye lens position during fluoroscopy was measured with a CdTe x-ray spectrometer. We mimicked transfemoral cardiac catheterization using a human-type phantom. Second, we evaluated the doses and calibration factors at three dosimetric points: front and back of protective goggles, and the front of the head (eye lens position). We used the measured x-ray spectrum to determine the incident photon distribution in the eye lens regions, and x-ray spectra corresponding to the dosimetric points around the eye lens were estimated using Monte Carlo simulation. Although the calibration factors varied with dosimetric positions, we found that the factors obtained were similar to the vendorsupplied calibration factor. Furthermore, based on the experiment, we propose a practical way to calibrate an OSL dosimeter in an actual clinical situation. A person evaluating doses can use a vendor-supplied calibration factor without any corrections for energy dependences, only when they add a systematic uncertainty of 5%. This evidence will strongly support actual exposure dose measurement during a clinical study.

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Section: Resultssupporting

confidence: 51%

“…16 The dose to the eye lens is mainly caused by scattered x-rays from the patient. 3,17 This means that a person evaluating doses should pay close attention to the verifications of the polychromatic x-ray spectrum related to the scattered and penetrating x-rays.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of calibration factor of OSLD toward eye lens exposure dose measurement of medical staff during IVR

Asahara

Hayashi

Goto

et al. 2020

J Applied Clin Med Phys

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“… 2 Cardiologists are exposed to scatter radiation from the patient, so they use lead aprons and lead glasses to protect them during procedures. 2 , 3 , 4 , 5 …”

Section: Introductionmentioning

confidence: 99%

“…reported that the annual exposure of a cardiologist under a lead apron is 5 mSv 2 . Cardiologists are exposed to scatter radiation from the patient, so they use lead aprons and lead glasses to protect them during procedures 2–5 …”

Section: Introductionmentioning

confidence: 99%

Estimating radiation exposure of the brain of a physician with a protective flap in interventional radiology: A phantom study

Hattori

Monzen

Tamura

et al. 2022

J Applied Clin Med Phys

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Purpose The efficiency of protective equipment for the brain has not been verified at the left anterior oblique (LAO) position, which is commonly used in clinical procedures. The purpose of this study was to investigate radiation exposure of the brain in interventional radiology (IR) and the shielding ability of a new protective flap. Methods We made a flap that combined a protective cap with a left lateral face shield. The flap was made of tungsten‐containing rubber (TCR). An anthropomorphic head phantom was placed at the physician's position, and air kerma rates (μGy/min and μGy/15s) were measured by electronic dosimeter at three locations: the surface of the left side of the head, and the left and right temporal lobes with the protective cap and the flap in fluoroscopy and cine modes. The X‐ray tube was at the lower left side of the physician, and its angles were LAO60 and LAO60CAU40. The tube voltage (95–125 kV), tube current (4.7–732 mA), and air kerma rate (27.8–1078 mGy/min) were automatically adjusted by the X‐ray system. We obtained the cap and the flap shielding efficiencies. Results In cine mode at LAO60CAU40, the shielding efficiencies on the surface of the left side of the head and left temporal lobe with the cap were 92.6% and 5.1%, respectively, and the corresponding shielding efficiencies with the flap were 92.5% and 86.1%, respectively. The flap can reduce radiation exposure of the brain more than the cap alone. Conclusions At the left anterior oblique in interventional radiology, the flap can reduce exposure to the brain.

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Assessment of the Annual Eye Lens Dose for Cardiologists During Interventional Procedures Using Anthropomorphic Phantoms and mEyeDose_X Tool

Saeed

2020

Cardiovascular Revascularization Medicine

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Eye lens dose levels in interventional rooms using simple phantom simulation, dose management software and Monte Carlo method of uncertainty assessment

Cited by 4 publications

References 8 publications

Evaluation of calibration factor of OSLD toward eye lens exposure dose measurement of medical staff during IVR

Evaluation of calibration factor of OSLD toward eye lens exposure dose measurement of medical staff during IVR

Estimating radiation exposure of the brain of a physician with a protective flap in interventional radiology: A phantom study

Assessment of the Annual Eye Lens Dose for Cardiologists During Interventional Procedures Using Anthropomorphic Phantoms and mEyeDose_X Tool

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