This study intended to investigate the optimum conditions for lumbar test that has the highest level of irradiation conditions among general test sites. To to this, the most widely used irradiation conditions in terms of statistics were set as standards; test groups applied with DMF were selected; tests groups suitable for clinical trials were selected by using suggested patient dose. Blind tests were conducted by 10 specialists and radiologists. The results suggested that under the optimum conditions, the radiation dose reduction of 2.09 mGy, 4.42 mGy and 3.65 mGy can be achieved in forward-backward test, lateral test and 4-direction test, respectively. There is a need of further studies on the optimization of irradiation conditions in accordance with the conditions of patients. . 과거 아날 http://dx
This study made a tentative estimation of the shielding rate of barium compound by thickness through monte carlo simulation to apply medical radiation shielding products that can replace existing lead. Barium sulfate(BaSO₄) was used for the shielding material, and thickness of the shielding material specimen was simulated from 0.1 ㎜ to 5 ㎜ by applying 15 × 15 ㎠ of specimen area, 4.5 g/㎤ of density of barium sulfate, and 11.34 g/㎤ density of lead. Entered source was simulated with 10kVp Step in consecutive X-ray energy spectrum(40 kVp ∼ 120 kVp). Absorption probability in 40 kVp ∼ 60 kVp showed same shielding rate with lead in 3 ㎜ ∼ 5 ㎜ of thickness, but it was identified that under 2 ㎜, the shielding rate was a bit lower than the existing lead shielding material. Also, the shielding rate in 70 kVp ∼ 120 kVp energy band showed similar performance as the existing lead shielding material, but it was tentatively estimated as fairly low shielding rate below 0.5 ㎜. This study estimated the shielding rate of barium compound as the thickness function of x-ray energy band for medical radiation through monte carlo simulation, and made comparative analysis with existing lead. Also, this study intended to verify application validity of the x-ray shielding material for medical radiation of pure barium sulfate. As a result, it was estimated that the shielding effect was 95% higher than the existing lead 1.5mm in at least 2mm thickness of barium compound in medical radiation energy band 70 kVp ∼ 120 kVp, and this result is considered valid to be provided as a base data in weight lightening production of radiation shielding product for medical radiation.
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