頭部CT画像における「枠の効果」の検証 : 頭部CT画像の脳実質写真濃度についての心理学的検討

概要

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When reading and diagnosing head CT images, it is not always clear whether or not the optical illusion known as the "picture frame effect" is present. In order to examine this phenomenon, I used personal computer image processing application software to create head CT images that look upon the skull and the background of the image as a single frame. Second, I tried to compare them using the visual subjective evaluation of nine observers. The results were then analyzed statistically. Because of the differences between frames, the discriminative ability of the human visual system (contrast/assimilation) could determine whether the picture frame effect was taking place. Even if the brain was shown at exactly the same photographic density, sometimes the plural frame in the image would leave a whitish impression on the observer and sometimes it would leave a blackish impression ; thus, it would seem that the practical density had been observed differently. Therefore, photographic density is under the influence of the frame that occasionally surrounds the image. In the future, we should further consider the "picture frame effect."
2000-07-20