RAI Labs Duke
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Medical image display assessment metrology

 

As the medical imaging practice is gradually transitioning from analog media to electronic media, it is vitally important to understand the tradeoffs in that transition, and to provide the best image quality possible on the display medium. For the last several years, one of RAI Labs faculty (Dr. Samei) has led a national task force (AAPM TG18) and served on an international committee (IEC) aimed to define standard testing methodologies for medical display devices. His research in this area is currently focused on the perceptual impact of display quality, and on the fine-tuning of new testing methodologies fore display quality characterization.

The way in which medical image data are displayed has a direct influence on diagnosis. This dependency is task-specific, and for many tasks in medical imaging, including the early detection and classification of cancer, has not been fully substantiated in quantitative terms. Current research at RAI Labs is focused on the influence of display characteristics on the diagnostic interpretation of breast cancer and lung cancer. The mammgraphic images below show a region of a mammogram with (right) and without (left) microcalcification clusters associated with breast cancer. The related images below show the layout of the calcifications alone, and the just noticeable difference (JND) map generated based on model calculations which depict the visibility of the lesion. The second set of images below show corresponding images and results when the images are blurred by the soft-copy display system.


Mammography images with (right) and without (left) microcalcification clusters associated with breast cancer. The related images below show the layout of the calcifications alone, and the just noticeable difference (JND) map generated based on model calculations which depict the visibility of the lesion.

The same images as above and results when the images are blurred by the soft-copy display system.

The chart depicts the reduction in the visibility of the lesion as a function of the sharpness of the display system.
 
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