X線撮影に関する基本物理特性の測定 : FFDと体位についての検討

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This time, the FFD in the radiography of chest, cervical vertebrae and lumber vertebrae was examined, measuring the change of penumbra, magnification, sensitivity and absorbed dose in respective radiography. In our study of chest radiography, the FFD = 200 cm was superior in all the cases. In cervical radiography, the case of FFD = 150 cm as a standard was compared with the cases of FFDs=100cm and 120cm. In the case of FFD = 120cm in cervical radiography, penumbra increased by 27-30%, and magnification by 1.6-4.7%. Also, in lumber radiography, the case of FFD = 120 cm as a standard was compared with the case of FFD = 100 cm. In the case of FFD = 100 cm in lumber radiography, penumbra increased by about 27%, and magnification by about 3%. In both cervical and lumber radiography, when FFD was fixed, sensitivity got better as OFD was shorter, and, when OFD was fixed, it got better as FFD was longer. Furthermore, as for the positioning in lumber radiography, it was examined, using Wilcoxon test, which was superior in sharpness of vertebrae image between extension and flexion. In spite of the sex, as for the sharpness of images, there was no significant difference at the level of significance of 5% between the two kinds of positioning, and, as for that of under vertebrae images (L4 and L5), fixed positioning was significantly superior. In Iumber radiography, flexural positioning is more desirable and it advantageously leads to correction of physiological anterior curve. However, the results show that, in upper vertebral radiography, freedom of subjects is given precedence over positioning.RadiographyFFDOFDsharpnessPositioning
東北大学の論文
2003-03-20

X線撮影に関する基本物理特性の測定 : FFDと体位についての検討

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