Verification of clinical test objects for diagnostic quality-guaranteed CRT monitor based on the visual evaluation

Takeo Ishigaki; Mitsuru Ikeda; Hisashi Usami; Satoshi Hidano; Kazuhiro Shimamoto; Yoshie Kodera

doi:10.1117/12.462696

12 April 2002 Verification of clinical test objects for diagnostic quality-guaranteed CRT monitor based on the visual evaluation

Takeo Ishigaki, Mitsuru Ikeda, Hisashi Usami, Satoshi Hidano, Kazuhiro Shimamoto, Yoshie Kodera

Author Affiliations +

Proceedings Volume 4686, Medical Imaging 2002: Image Perception, Observer Performance, and Technology Assessment; (2002) https://doi.org/10.1117/12.462696
Event: Medical Imaging 2002, 2002, San Diego, California, United States

Abstract

The purpose is to verify the clinical usefulness of newly developed visual test-objects including chest images and contrast test images for a safe usage of CRT monitor. Various kinds of test images including the contrast-detail method were created. Here, the 11 CRT monitor display conditions that simulated the CRT monitors degraded by the long-term usage were tested. The soft-copy test-images under 11 kinds of monitor-luminance conditions were observed. From the results of the threshold contrast values at which the target was just visible, we determined the border zone of CRT monitor luminance below which the diagnostic performance was inferior to that of the normal CRT monitors. In the darker display conditions in which the maximum luminance was 0.607 or less of the normal CRT luminance (480 cd/m²), the correct detection rates of targets were significantly inferior to that in the normal CRT display condition (480 cd/m²)(p<0.05). In the perception study of the contrast test images luminance where the monitor became apparently too dark for the image interpretation was 0.52 to 0.59 of the normal CRT luminance. The method with proposed visual test-objects is practical for daily check of diagnostic CRT monitors and convenient for diagnostic radiologists.

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Takeo Ishigaki, Mitsuru Ikeda, Hisashi Usami, Satoshi Hidano, Kazuhiro Shimamoto, and Yoshie Kodera "Verification of clinical test objects for diagnostic quality-guaranteed CRT monitor based on the visual evaluation", Proc. SPIE 4686, Medical Imaging 2002: Image Perception, Observer Performance, and Technology Assessment, (12 April 2002); https://doi.org/10.1117/12.462696

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KEYWORDS

CRTs

Lithium

Target detection

Chest

Diagnostics

Visualization

Chest imaging

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