Bismuth shielding in computed tomography

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August undefined, 2024

WebThe use of bismuth shielding to reduce the dose absorbed by breast during thoracic CT ... [2013] have analyzed image quality using bismuth shielding in Coronary Computed Tomography Angiography (CCTA) and suggested further research. Wang et al. [2011] studied dose reduction and image quality taking into account bismuth shielding and ... WebTo compare standard of care and reduced dose (RD) abdominal computed tomography (CT) images reconstructed with filtered back projection (FBP), adaptive statistical iterative reconstruction (ASIR), model-based iterative reconstruction (MBIR) techniques. ... Comparison of bismuth shielding, organ-based tube current modulation, and use of a ...

Applied Sciences Free Full-Text Gamma Ray Shielding …

WebBismuth, which showed excellent shielding properties in simulations, was selected to be mixed with barium sulphate to obtain high performances mixtures. ... For hard X-ray industrial applications, such as radiography and computed tomography with energies in the 20-220keV range, the best performing mixtures are: 60:20:20, 40:40:20 and 20:60:20 ... WebBackground: Although the bismuth breast shield can reduce radiation exposure to the breast during dual-energy computed tomography (DECT), it can potentially affect material quantification on DECT due to artifacts. Purpose: To evaluate the effects of bismuth breast shielding on iodine quantification and radiation exposure in DECT. how to show only mutual friends on facebook

Application of Different methods for Reducing Radiation Dose to …

WebThe main objective of the present work was to assess the gamma radiation shielding competencies and gamma radiation transmission factors (TFs) for some tellurite glasses in the form of Bi2O3–TeO2–Na2O–TiO2–ZnO. MCNPX general-purpose Monte Carlo code (version 2.6.0) was utilized for the determination of TF values at various well-known … WebBismuth shielding has been used to reduce the dose from CT to anterior radiosensitive organs, such as the breast, lens of the eye, thyroid, and gonads [1,2]. ... Cantera A: Quantitative assessment of selective in-plane shielding of tissues in computed tomography through evaluation of absorbed dose and image quality. Eur Radiol 2006, … WebApr 12, 2024 · To compare the dose and image quality of three methods for reducing the radiation dose to the eye at head computed tomography (CT): bismuth shielding, organ-based tube current modulation (TCM ... how to show only weekends in excel

Bismuth shield affecting CT image quality and radiation dose in ...

Organ-based tube current modulation and bismuth eye …

WebThe bismuth shield was placed over the breast component during CP4 and CP5 scans. Results: The pattern of absorbed doses in each breast and quadrant were approximately the same for all protocols, where the 4th quadrant > 3rd … WebKeywords: coronary artery CT angiography, bismuth breast shield, MEC, AEC, breast dose. 1. INTRODUCTION system which has been introduced with the development of The artificial radiation exposure is about 20% of the total amount of radiation exposure for human beings, and more than 15% of the artificial radiation exposure is caused by medical nottinghamshire signWeb6 rows · Jun 25, 2024 · Bismuth shielding techniques have been used to reduce radiation, but image noise increased, ... how to show only one of duplicates in excel

"WebApr 12, 2024 · In the case of bismuth shielding, the dose at 11 o'clock was decreased to 34.06% and the dose at 1 o'clock was decreased to 34.32%. Dose reduction was … " - Bismuth shielding in computed tomography

Bismuth shielding in computed tomography

Use of bismuth shield for protection of superficial radiosensitive ...

WebCoronary computed tomography angiography (CCTA) ... Bismuth shielding significantly decreased organ doses (p<0.001); a significant difference was found in both medium- and large-breast phantoms, and for both helical and axial scanning (p<0.02 for each). Breast dose was decreased by 46–57% with shielding, depending on the scan protocol and ... WebBismuth shielding has been used to reduce the dose from CT to anterior radiosensitive organs, such as the breast, lens of the eye, thyroid, and gonads [1,2]. These bismuth …

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WebBismuth shielding was recommended in 88.89% of the studies based on the maintenance of appropriate image quality under shielding. Noise associated with Bi shielding was 7.5%, 263%, and 23.5% for the eye, thyroid, and breast, respectively. WebMay 30, 2024 · Computed Tomography (CT) has become an important tool to diagnose cancer and to obtain additional information for different clinical questions. Today, it is a very fast, painless and noninvasive test that can be performed high quality images. ... Evaluation in the Use of Bismuth Shielding on Cervical CT Scan Using a Female Phantom

WebMar 12, 2024 · Results showed that bismuth shielding is associated with a lower radiation dose exposure than Pb shielding. The dose measured when one to four bismuth shields was used to cover the anteroposterior of the gonad ranged from 35.26 uSv to 0.99 uSv, representing a reduction of 76.38% to 99.34% compared with the unprotected control, …

WebApr 1, 2024 · In this research, using direct measurements and Monte Carlo calculations, the potential dose reduction achieved by bismuth shielding in computed tomography was evaluated. The patient dose was ... WebBismuth shielding during CT exams: a literature review. Dose-reducing techniques and patients' radiation protection are of more concern today than in the past with the …

WebJun 25, 2024 · Bismuth shielding techniques have been used to reduce radiation, but image noise increased, degrading image quality. Purpose: The aim of this study was to investigate how the use of iterative reconstruction (IR) combined with bismuth shielding influences image quality. Materials and methods:

WebApr 11, 2012 · Bismuth shielding increases image noise across the entire image, not just directly under the shields. 3–5 It also causes streak and beam hardening artifacts, which can artifactually increase CT numbers, … nottinghamshire slangWebDec 1, 2024 · The literature indicates that bismuth shielding increases image noise and CT numbers as well as introducing streak artifacts. Tube current modulation (TCM) technique and iterative reconstruction algorithms can provide some levels of dose reduction to radiosensitive organs and superior image quality without the disadvantages of bismuth … nottinghamshire social eating networkWebApr 20, 2016 · The aim of this study is to implement a bismuth eye lens shielding system for Head-CT acquisitions in these cases. ... Loader R (2013) A phantom-based evaluation of three commercially available patient organ shields for computed tomography X-ray examinations in diagnostic radiology. Radiat Prot Dosim 155:161–168. Article CAS … how to show onomatopoeia in writingWebMay 8, 2014 · Despite the dose reduction capabilities of bismuth shields, there are numerous studies that discourage their use. 5,17,18, 29, 39,52 According to several … nottinghamshire small steps serviceWebApr 12, 2024 · We sought to minimize streak artifacts caused by beam hardening on chest CT scan, obtain high-quality CT images and compare image quality and dose between with and without iodine and bismuth shielding material to protect superficial organs. During CT, the radiation dose was measured and the images evaluated before using the shielding … how to show opening balance in tallyWebComputed Tomography Physical Principles, Patient Care, Clinical Applications, and Quality Control 5th Edition - June 16, 2024 Write a review Author: Euclid Seeram Paperback ISBN: 9780323790635 eBook ISBN: 9780443107009 Purchase options Select country/region Info/Buy Institutional Subscription Request a Sales Quote Tax Exempt … nottinghamshire smoking cessationWebBackground: Although the bismuth breast shield can reduce radiation exposure to the breast during dual-energy computed tomography (DECT), it can potentially affect … how to show open tabs