Bismuth shielding in computed tomography
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 … 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 …
Bismuth shielding in computed tomography
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WebApr 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 … 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.
WebINIS 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. 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.
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: 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 …
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 …
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 much is shein delivery ukWebCoronary 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 ... how do i find my ernhow much is sheffield united worthWebBismuth 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. how do i find my esi id numberWebThe 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 ... how much is shein shipping fee in randsWebKeywords: 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 how do i find my epson printer driverWebBismuth, 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 ... how do i find my ets date army enlisted