Effects of bismuth breast shielding on iodine quantification in dual-energy computed tomography: an experimental phantom study

Jang, Hyunsik; Hur, Jin; Choi, Byoung Wook; Im, Dong Jin; Hong, Yoo Jin; Kim, Young Jin; Lee, Hye Jeong

doi:10.1177/0284185118768098

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…However, the fact of beam hardening leads to an unpredictable change of Hounsfield units, thereby challenging for any quantitative image analysis, e.g. for coronary CT angiography or iodine quantification [43,66,67]. In addition, if authors conclude that despite the shielding causing higher noise levels a sufficient diagnostic image quality was achieved, then, one has at least to reconsider whether the original protocol would allow for dose savings based on optimized scanning parameters instead of contact in-plane-shielding.…”

Section: In-plane Shieldingmentioning

confidence: 99%

Systematic literature review on the benefit of patient protection shielding during medical X-ray imaging: Towards a discontinuation of the current practice

et al. 2022

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Patient shielding during medical X-ray imaging has been increasingly criticized in the last years due to growing evidence that it often provides minimal benefit and may even compromise image quality. In Europe, and as also shown in a short assessment in Switzerland, the use of patient shielding is inhomogeneous. The aim of this study was to systematically review recent literature in order to assess benefits and appraise disadvantages related to the routine use of patient shielding. Methods: To evaluate benefits and disadvantages related to the application of patient shielding in radiological procedures, a systematic literature review was performed for CT, radiography, mammography and fluoroscopyguided medical X-ray imaging. In addition, reports from medical physics societies and authorities of different countries were considered in the evaluation. Results: The literature review revealed 479 papers and reports on the topic, from which 87 qualified for closer analysis. The review considered in-and out-of-plane patient shielding as well as shielding for pregnant and pediatric patients. Dose savings and other dose and non-dose related effects of patient shielding were considered in the evaluation. Conclusions: Although patient shielding has been used in radiological practice for many years, its use is no longer undisputed. The evaluation of the systematic literature review of recent studies and reports shows that dose savings are rather minimal while significant dose-and non-dose-related detrimental effects are present. Consequently, the routine usage of patient protection shielding in medical X-ray imaging can be safely discontinued for all modalities and patient groups.

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Section: In-plane Shieldingmentioning

confidence: 99%

Systematic literature review on the benefit of patient protection shielding during medical X-ray imaging: Towards a discontinuation of the current practice

et al. 2022

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“…Many studies showed that CT scans increase the incidence of cancer risk (2,3). The dose of the superficial organs in CT scan examination is high and the breast is one of the organs that is directly irradiated through thoracic CT scans and it is also a sensitive organ to radiation (4). Breast cancer is one of the most important reasons causing death in women; therefore, the strategy of radiation protection must be used in order to reduce radiation dose to these organs (5).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Effect of Nano-Composite Shield on Radiation Risk Prevention to Breast During Computed Tomography

Mehnati¹,

Malekzadeh²,

Divband³

et al. 2020

Iran J Radiol

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Background: Application of nanomaterial has recently been introduced as a novel method to make a radiation shield to protect biological damage. Objectives: The purpose of this study was to evaluate the effectiveness regarding the use of nano-shield on the protection of the breast in chest computed tomography (CT) scan. Materials and Methods: Bismuth oxide nanoparticles were prepared and synthesized in the Chemistry Laboratory of the University of Tabriz. Special tests were used to evaluate the properties of nanoparticles. Then, nano-bismuth oxide shields were designed with the silicon matrix at 10% and 15% ratios in 0.5-and 1-mm thicknesses, respectively. The dosimetry process was performed by thermoluminescent dosimeters (TLD) dosimeters in the skin and fourth layers of the breast in the chest CT scan. Also, signals and noises of the images were obtained to assess the effects of shield on image quality. Nanoparticles size was equal to 24 nm and they were spherical in shape. The distribution of nanoparticles in the silicone matrix was approved by scanning electron microscope energy dispersive spectroscopy (SEM-EDS). Results: Nano-bismuth shields reduced the dose value by 9% and 15% in the skin layer related to 10% and 15% bismuth nanoparticles ratio (0.5 mm thickness), respectively. Also, by increasing shield thickness to 1 mm, the dose of skin layer was reduced by 18% and 24% related to 10% and 15% of bismuth nanoparticles ratio, respectively. Analysis of CT image showed a 10% increase in the noise related to the 10% bismuth shield. Conclusion:The nano-bismuth composite shield with different ratios and thicknesses show significant dose reduction in the breast. This could play a role in breast cancer prevention during chest CT scan.

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Effects of bismuth breast shielding on iodine quantification in dual-energy computed tomography: an experimental phantom study

Abstract: Although using the bismuth breast shield may decrease radiation exposure to the breast on DECT, it may also significantly affect iodine quantification.

Cited by 2 publications

References 24 publications

Systematic literature review on the benefit of patient protection shielding during medical X-ray imaging: Towards a discontinuation of the current practice

Systematic literature review on the benefit of patient protection shielding during medical X-ray imaging: Towards a discontinuation of the current practice

Assessment of the Effect of Nano-Composite Shield on Radiation Risk Prevention to Breast During Computed Tomography

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