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Radiology, Vol 134, 149-154, Copyright © 1980 by Radiological Society of North America

ARTICLES

Detection of low-contrast lesions in computed body tomography: an experimental study of simulated lesions

TF Meaney, U Raudkivi, WJ McIntyre, JH Gallagher, JR Haaga, TR Havrilla and NE Reich

Observer accuracy in the identification of low-contrast objects in computed tomography (CT) was studied. Thresholds were established for detection of lesions of various sizes and attenuation differences in CT images produced at different radiation doses. Noise reduction was important in identifying certain types of lesions. Detection was not accurate when the standard deviation of the mean of an organ exceeded the difference in the means of the lesion and the surround region.


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