新オルソ・システムを用いた被曝線量低減の検討(4):胸部ファントム写真の観察評価による高温現象の可能性についての検討

概要

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Recently, some new ortho screen-film systems (Konica EX system, Fuji AD system and Kodak IEF system) are being developed. The granualities of these systems have been greatly improved and gross fogs are lower than those of traditional ortho screen-film systems.<BR>Even if the radiographs with the new ortho screen -film are pr o cessed at higher temperature than with the old ortho system such as Lanex Medium /TMC-RA (Eastman Kodak), the deterioration in the image quality is negligible.<BR>Furthermore, the speed of the screen-film systems increases as the developing temperature rises. Therefore, there may be the potential to reduce patients' radiation exposure without greatly decreasing the image quality. At that time, the problem arises how to determine the appropriate developing temperature. The limit of developing temperature for the new ortho system was determined as the temperature for getting the same gross fog in old ortho-system.<BR>In this report, phantom radiographs were made at various de veloping temperatures and the comments about the higher limit of the developing temperature were solicited from medical doctors who evaluated them.<BR>Consequently, it has been confirmed there are sufficient image qualitiy in the radiographs which were developed at the higher developing temperature than at the temperature used in many faculities now.
Japan Society of Medical Physicsの論文