The purpose of the present study was to evaluate radiation dose reduction and image quality during CT scanning by using a new dose reduction fiber sheet (DRFS) with commercially available bismuth shields. These DRFS were composed of nano-barium sulfate (BaSO 4 ), filling the gaps left by the large oxide bismuth (Bi 2 O 3 ) particle sizes. The radiation dose was measured five times at directions of 12 o'clock from the center of the polymethyl methacrylate (PMMA) head phantom to calculate an average value using a CT ionization chamber. The image quality measured CT transverse images of the PMMA head phantom depending on X-ray tube voltages and the type of shielding. Two regions of interest in CT transverse images were chosen from the right and left areas under the surface of the PMMA head phantom and from ion chamber holes located at directions of 12 o'clock from the center of the PMMA head phantom. The results of this study showed that the new DRFS shields could reduce dosages to 15.61%, 23.05%, and 22.71% more in 90 kVp, 120 kVp, and 140 kVp, respectively, than with a conventional bismuth shield of the same thickness, while maintaining image quality. In addition, the DRFS were produced to about 25% more thinness than conventional bismuth. We concluded, therefore, that DRFS can replace the conventional bismuth and may be utilized as a new shield.
The purpose of this study was to evaluate of the usefulness and to develop new auxiliary equipment that can bending angle of the bone of the knee various depending on the thickness of the thigh of the human. The subjects agreed for research purposes and were selected from normal person who do not have past knee-related diseases and grouped thin group A and thick group B for the thigh. We set in order to obtain images in the axial direction of the bones of the knee, 35° to increase by 5° angle of knee flexion, 45°, to 55°, and we performed combinations of 9 tests by incident angle X-ray per each angle, 40°, 50° and 60°. As a result, we have developed an Merchant auxillary equipment of X-ray table integral type in radiographic images which was easy to use and could take images of various integral knee joint angles adjusting different body types. Using the auxiliary equipment, in the case of X-ray incident angle 50° and 60° with the knee flexion angle of 40° in group A, and in group B, Knee flexion angle of 45° and 35°, the X-ray incident angle at 60°, excellent images were derived. Future, it would be very useful in the examination of patients with a variety of body types.
The purpose of this study was to perform an actual proof analysis on the structural effects of recognition of radiation risks on management and benefits. Data was collected using self-administered questionnaires targeting students having majors related to radiation from 1 April to 31 May in 2013 of one four-year-course university located in Chungbuk, Korea. As a result of the analysis, it turned out that as recognition of radiation risks is higher, recognition of radiation management is higher, which has a significant effect on benefits. It was indicated that although recognition of radiation risks does not directly influence radiation benefits, positive recognition on radiation benefits could increase through the parameter, radiation management. In order to improve smooth use of radiation and increase benefits, education that emphasizes the need of proper radiation management should be performed.
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