Bismuth shielding in computed tomography

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August undefined, 2024

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 ... WebAug 7, 2024 · Finally, bismuth shielding reduced 40% of cancer risk, and it decreased in both genders by increasing age at exposure. Conclusion: According to our findings, excess relative risk (ERR) up to...

Evaluation in the Use of Bismuth Shielding on Cervical ... - SpringerLink

WebApr 23, 2024 · This research work aims to investigate the radiation shielding ability of a Yb 3+-doped calcium borotellurite glass system.The system has the basic composition of CaF 2 –CaO–B 2 O 3 –TeO 2 –Yb 2 O 3 but is denoted as TeBYbn for simplicity. The effect of increasing the TeO 2 content in the glasses from 10 to 54 mol% was investigated, with … 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 ... dust brake covers

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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 … WebDec 3, 2009 · 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 measured using an ionisation chamber in a polymethylmethacrylate (PMMA) phantom that had five measurement points at the … 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 … dust bowling

Protection of superficial organs using bismuth and iodine …

Organ-based tube current modulation and bismuth eye shielding …

WebSimulations were performed to estimate Computed Tomography Dose Index values using GEANT4 and MCNPX. The relative differences between measurements and simulations were <10 %. The dose reduction arising from the use of bismuth shielding ranges from 2 to 45 %, depending on the position of the bismuth shield. WebFeb 21, 2024 · Bismuth 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. dust bowl static electricityWebINIS Repository Search provides online access to one of the world's largest collections on the peaceful uses of nuclear science and technology. The International Nuclear Information System is operated by the IAEA in collaboration with over 150 members. dva housing support

"Web6 rows · Jun 25, 2024 · Bismuth shielding techniques have been used to reduce radiation, but image noise increased, ... " - Bismuth shielding in computed tomography

Bismuth shielding in computed tomography

Effects of bismuth breast shielding on iodine …

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: WebMay 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 …

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WebDec 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 … WebBackground: To quantify image quality and radiation doses in regions adjacent to and distant from bismuth shields in computed tomography (CT). Methods: An American College of Radiology accreditation phantom with four solid rods embedded in a water-like background was scanned to verify CT number (CTN) accuracy when using bismuth shields.

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 ... Webwww.ncbi.nlm.nih.gov

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 … WebJul 15, 2024 · The commercially available bismuth eye shield, consisting of one layer of bismuth-impregnated latex, was 16-cm long, 4-cm wide and equivalent to a 0.07-mm Pb layer (CTEYEPROTEC 2 mm; XProtect, Reinach, Switzerland). A 0.5-cm thick layer of foam is attached by the manufacturer behind the bismuth layer.

WebJun 20, 2024 · Bismuth has gained attention in preclinical research because of its ability to attenuate X-rays and high biocompatibility, which make it an excellent element for use in a biomedical agent or in radiation shielding. Developments in the synthesis of elemental bismuth nano- and microparticles, their X-radiation interactions, and their biological …

WebApr 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 … dust bowl woman photoWebBackground: Coronary computed tomographic angiography (CCTA) is associated with high radiation dose to the female breasts. Bismuth breast shielding offers the potential to significantly reduce dose to the breasts and nearby organs, but the magnitude of this reduction and its impact on image quality and radiation dose have not been evaluated. dva holma watch online freeWebApr 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 ... dust bowl: the southern plains in the 1930sWebApr 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, … dust brush for nailsWebJan 1, 2012 · Organ-based TCM provided superior image quality to that with bismuth shielding while similarly reducing dose to the eye. Simply reducing tube current globally by about 30% provides the same dose … dva home and garden maintenanceWebTo 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 ... dust bowls and dust storms great depressionWebBismuth 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, … dva home medical oxygen therapy