Effects Of The CT Display Window On Detectability Of Large And Small Lesions

Dana A. Twible; Philip F. Judy; Richard G. Swensson

doi:10.1117/12.943221

28 August 1984 Effects Of The CT Display Window On Detectability Of Large And Small Lesions

Dana A. Twible, Philip F. Judy, Richard G. Swensson

Proceedings Volume 0486, Medical Imaging and Instrumentation '84; (1984) https://doi.org/10.1117/12.943221
Event: Medical Imaging and Instrumentation '84, 1984, Las Vegas, United States

Abstract

The effects of CT display window width and lesion size on observer performance were studied by measurements of contrast-detail "thresholds" and lesion detectability (using ROC analysis). Both methods of measuring observers' perceptual performance showed that lesions became less visible as the width of the display window increased, and that the magnitude of this effect was greater for larger (lower contrast) lesions than for smaller ( higher contrast) lesions. Manipulations of the CT display window did not affect the information content of the physical image, as measured by actual calculations of signal-to-noise ratio for a "lesion-matched" filter. Therefore, the effects of display window on observer performance were attributed to psychophysical properties of the human visual system.

Citation Download Citation

Dana A. Twible, Philip F. Judy, and Richard G. Swensson "Effects Of The CT Display Window On Detectability Of Large And Small Lesions", Proc. SPIE 0486, Medical Imaging and Instrumentation '84, (28 August 1984); https://doi.org/10.1117/12.943221

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