Enhancement of computed tomographic scanner based digital radiographic images

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Abstract
Scanned digital radiographs are 1 of the imaging facilities available on the EMI 7070 scanner. The images offered by the system were found to be clinically poor because the round shape of the patient was forming the major component of the image. Two empirical methods to account effectively for patient shape were investigated and are now in clinical use. The 1st method assumes that the patient shape is approximated to a 2nd-order polynomial of the picture element position. For each line of the image a 2nd-order polynomial function is fitted to the image data, then removed from the image data. The 2nd method involves using the existing CT [computed tomography] wedge as an average compensation wedge to remove the majority of the effect of the patient shape. The relative merits and clinical application of both techniques are discussed.

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