PubMed · 715013
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C J Karzmark, P A Huisman. 1978. A versatile radium storage safe.. https://doi.org/10.1088/0031-9155%2F23%2F5%2F017
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Owing to the high radiation exposure associated with computed tomography (CT) examinations and the image quality degradation caused by conventional radiation shielding materials, this study evaluated the dose reduction performance and image quality maintenance potential of a newly developed lead-free composite shielding material. This material was composed of bismuth, tungsten, tungsten carbide, aluminium, and polyurethane. Phantom-based dose measurements demonstrated that the shielding material achieved dose reduction rates ranging from 17.6% to 37.6%, depending on tube voltage. Signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and changes in tube current-time product (mAs) under a scout-based automatic exposure control (AEC) protocol were analysed according to the presence or absence of the shielding material across regions. For the clinical evaluation, CT scans were performed on four patients. Furthermore, the images were reviewed to evaluate whether this material affected image quality. The shielding material exhibited radiation reduction levels comparable to those reported in previous studies. SNR and CNR analyses showed minor statistical variations in certain regions; however, most differences were not statistically significant, and even significant differences remained within a range that did not compromise diagnostic image quality. Under the scout-based AEC protocol, the use of the shielding material resulted in less than 1% variation in mAs values. No visually perceptible artefacts or clinically significant image quality degradation were observed. The proposed composite shielding material demonstrated the potential to mitigate some limitations of conventional shielding materials and showed preliminary clinical feasibility as an adjunctive strategy for radiation dose reduction in CT examinations.
The Third Conference on Radiation Protection and Dosimetry was conducted in Orlando, FL, on 21-24 October 1991. At the end of the conference, each member of the Technical Program Committee summarized the events considered to be of particular importance. Subjects discussed included dosimetry accreditation programs, regulations, standards, compliance, advances in dosimeters and instrumentation, training, needs in metrology, and funding of dosimetry research. These statements have been collected and combined and are presented as a brief summary of the conference.
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