Assessment of the efficiency of new bismuth composite shields in radiation dose decline to breast during chest CT

Mehnati, Parinaz; Malekzadeh, Reza; Sooteh, Mohammad Yousefi; Refahi, Soheila

doi:10.1016/j.ejrnm.2018.06.011

Cited by 9 publications

(13 citation statements)

References 12 publications

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“…Application of BSC (1 mm thickness) for breast shield on the four location of female chest phantom recorted by TLD showed 12% dose reduction (21) . The highest reduction doses were recorded in the skin layer by BPC shields, at 15%, and a thickness of 2.2 mm.…”

Section: Discussionmentioning

confidence: 98%

Polyurethane compositions of Bismuth used for breast shields during chest CT

et al. 2021

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Background: Bismuth Polyurethane composite is a novel shield for breast protection while saving image quality in chest CT. Bismuth different concentrations used for constructing polymer composites breast shields in this study. Materials and Methods: Bismuth with particle size <150 micrometer used in bismuth polyurethane composite (BPC) with a ratio of 10%, 15% and 1.1, 2.2 mm thicknesses. The BPC was examined on the female chest phantom (skin and fourth layers), 120 kV and 80 mA selected as an exposure factors in chest CT. The dose reduction was recorded by TLD and the image quality was evaluated quantitatively and quantitatively. Results: Using BPC shields 10% and 15% (2.2 mm) induced to breast dose reduction to 69.1% and 77.5% for skin layer and 44.7% and 52.8% for fourth layer, respectively. The image noise Increasing in BPC for breast and mediastinum areas were 9.43% (P=0.347) and 15.44% (P=0.386), respectively. Conclusion: Application of Bismuth with different weight ratios in polyurethane composite was useful shield for radiation dose reduction of the breast in chest CT.

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Section: Discussionmentioning

confidence: 98%

Polyurethane compositions of Bismuth used for breast shields during chest CT

et al. 2021

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“…In USA, the use of CT increased from 3 million users in 1980 to 80 million in 2007 [1]. Thoracic CT examination assesses various disorders related to breathing, the mediastinum, and the lungs [2]. In the context of thoracic CT, the anatomic location of breast tissue in women is in the primary beam, but it is often not the organ of interest for diagnostic purposes [2,3] although it is directly exposed by the primary x-rays.…”

Section: Introductionmentioning

confidence: 99%

“…Thoracic CT examination assesses various disorders related to breathing, the mediastinum, and the lungs [2]. In the context of thoracic CT, the anatomic location of breast tissue in women is in the primary beam, but it is often not the organ of interest for diagnostic purposes [2,3] although it is directly exposed by the primary x-rays. According to the International Commission on Radiological Protection (ICRP), the breast is one of the most vulnerable human organs to radiation and must be protected.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of silicone rubber-lead shield's effectiveness in protecting the breast during thoracic CT

Lestari¹,

Anam²,

Sutanto³

et al. 2023

Biomed. Phys. Eng. Express

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Radiation of thoracic computed tomography (CT) involves the breast as not an organ of interest. According to the International Commission on Radiological Protection (ICRP) No. 103, the breast is an organ with a high level of sensitivity when interacting with X-rays, increasing the potential risk of breast cancer. Therefore, the radiation dose must be optimized while maintaining image quality. The dose optimization can be accomplished using a radiation shield. This study aims to determine the effect of silicone rubber (SR)-lead (Pb) in various thicknesses as an alternative protective material for thoracic CT while maintaining image quality. SR-Pb was made by a simple method using SR and Pb. The SR-Pb had different thicknesses of 3, 6, 9, and 12 mm. The breast dose was measured using a CT dose profiler on the surface of the breast phantom. The CT number and the noise level of the resulting image were determined quantitatively. The dose without the radiation shield was 5.4 mGy. The doses measured using shielding with thicknesses of 3, 6, 9, and 12 mm were 5.2, 4.5, 4.3, and 3.3 mGy, respectively. Radiation shielding with a thickness of 12 mm reduced breast surface dose by up to 38%. The CT numbers and noise levels for the left and right breast phantom images were almost the same as those without radiation shields indicating there are only slight artifacts in the image. Therefore, the SR-Pb material is considered a good shielding and can be applied clinically by placing it directly on the breast surface for dose optimization.

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“…Thus, to move towards preserving general health, using bismuth shields is a reccommended assay for reducing radiation doses in female breast during MDCT examinations (11)(12)(13)(14)(15). For the first time, Hopper et al (16) reported that bismuth shields can decrease the average radiation dose by 57%.…”

Section: Introductionmentioning

confidence: 99%

New Bismuth Composite Shield for Radiation Protection of Breast During Coronary CT Angiography

2019

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Background: The main problem with coronary computed tomography angiography (CCTA) scan is the extreme exposure of patients during imaging. Bismuth belt shield is a new design to minimize the received dose in CCTA. Objectives: The purpose of this study was to design and construct new bismuth-silicon composite shields to reduce the risk of ionizing radiation during CCTA, along with an examination of the diagnostic capability of the image for the physician. Materials and Methods: Dose reduction was calculated by placing thermoluminescent dosimeters (TLDs) in skin and glandular position for breast dose measuring in the multi detector CT. CCTA scans were performed with new 10% and 15% bismuth composite shields with 1 mm and 1.5 mm thicknesses. Image quality was assessed by CT numbers and noise evaluation. Results: The breasts recorded dose without using shield were 7-8.90 mGy related to large or normal breasts and skin or glandular dose. The results of using 10% and 15% bismuth composite shields induced to dose reduction 9%-31% depending on breast size, shield thickness and skin or gland position. There was a significant relationship between the reduction of breast doses and the thickness of the shields, bismuth weight percentage, the size of the breast and the dosimetry in the skin or gland. The mean noise increased from 8% to 33% in the breast position and from 4% to 25% in regions of Interest (ROIs) in locations of coronary arteries. Conclusion: The new belt bismuth-silicon shields have the potential to reduce breast dose by conserving image quality for acceptable diagnosis in CCTA.

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Assessment of the efficiency of new bismuth composite shields in radiation dose decline to breast during chest CT

Cited by 9 publications

References 12 publications

Polyurethane compositions of Bismuth used for breast shields during chest CT

Polyurethane compositions of Bismuth used for breast shields during chest CT

Evaluation of silicone rubber-lead shield's effectiveness in protecting the breast during thoracic CT

New Bismuth Composite Shield for Radiation Protection of Breast During Coronary CT Angiography

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