1995 Volume 51 Issue 12 Pages 1742-1746
We studied the characteristics of a new screen/film system (AD system : HGM/UR-1, Fuji) for chest radiography, that is, H-D curve, relative speed, cross-over effect, resolution and noise properties, X-ray attenuation rate and relative fluorescence. The shape of characteristic curve of UR-1 film is suitable for chest radiography, because the density of UR-1 is higher than that of super HRS film (sHRS) in low exposure range. However, the film gradient of UR-1 is a little lower compared to sHRS. The visibility of mediastnum area and lungs by AD system is superior and or equivalent, compared with conventional HR4 screen/sHRS film system. Relative speed of UR-1 film was approximately 50% sHRS. However, the speed of AD system was equivalent to HR4/s HRS system. Cross-over ratio of UR-1 film was 30% lower than that of sHRS film. X-ray attenuation rate and relative fluorescence of HGM screen were 15% and 120% higher than these of HR4, respectively. Modulation transfer function of AD system and HR4/sHRS system were equivalent. Wiener Spectral value of AD system was 50% lower than that of HR4/sHRS system in low spatial frequency, and 20% lower in high spatial frequency.
