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Radiology, Vol 154, 163-169, Copyright © 1985 by Radiological Society of North America

ARTICLES

Histogram equalization of CT images

JL Lehr and P Capek

Histogram equalization for display of clinical CT images was evaluated. In theory, histogram equalization makes optimal use of an available grey scale to display an image, and its use could circumvent the problem of selecting specific window settings for each image. In several clinical images, the use of a spatially variable histogram equalization technique limited to that portion of the CT image occupied by the patient did appear to increase the visibility of anatomic structures. However, using the technique also increased displayed image noise and artifacts. Although radiologists found this to be objectionable, it did not decrease the detectability of simulated low- contrast liver metastases. Further evaluation of histogram equalization for displaying CT images is being pursued.


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L. M. Fayad, Y. Jin, A. F. Laine, Y. M. Berkmen, G. D. Pearson, B. Freedman, and R. Van Heertum
Chest CT Window Settings with Multiscale Adaptive Histogram Equalization: Pilot Study
Radiology, June 1, 2002; 223(3): 845 - 852.
[Abstract] [Full Text] [PDF]


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