Equivalent Spatial Frequency and Optimum Film Densities for the Perceptibility of Radiographic Contrast of Step-Edge images

M. MatsumotoSchool of Allied Health Sciences, Faculty of Medicine, Osaka University, Toyonaka, Osaka, 560, Japan.

Y. OzakiScientific Investigation Laboratory, Kyoto Prefectoral Police Headquarters, Kamigyou-ku, Kyoto, 602, Japan.

H. KubotaInformation Processing Center, Shiga University, Hikone, Shiga, 522, Japan.

Y. AsaiDepartment of Radiology, Kinki University Hospital, Osaka-Sayama, Osaka, 589, Japan.

H. KanamoriDepartment of Electronics & Information Science, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606, Japan

Abstract

Previous experimental results for minimum perceptible contrasts of step-edge images and sinusoidal periodic patterns were transformed to minimum perceptible luminous-exitance differences. By comparing the differences between the two kinds of patterns, the equivalent spatial frequency for the perceptibility of step edges was determined as 1.6-1.8 mm 1. From the minimum perceptible contrasts of step-edge images, the optimum film densities for step edges were obtained as 1.1 - 1.3 for Kodak XRP and OC medical films and 1.7 -2.0 for Fuji Industrial 100 and FR industrial films.

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Equivalent Spatial Frequency and Optimum Film Densities for the Perceptibility of Radiographic Contrast of Step-Edge images

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Equivalent Spatial Frequency and Optimum Film Densities for the Perceptibility of Radiographic Contrast of Step-Edge images

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