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Contrast Enhancement of Scanning Procedures by High-Speed Digital Computer¹

Rochester, Minnesota

ABSTRACT

Computer-produced digital quantitative scans have been shown to offer all the advantages of color, but instead of using only six to eight gradations, we use 20 now. It offers the further advantages of data manipulation such as background corrections, decay correction, running statistical analysis, total summation, and corrections for scalloping and for unvevennesses in count rates due to pass direction. An additional bonus is that such scans are probably the least expensive type of readout; equipment beyond the pulse height analyzer is not essential. An online production of 20 contrast levels, plus quantitation plots, derivative plots, and contour plots, is accomplished in a small amount of IBM 7090 time, approximately less than $4 worth.

FOOTNOTES

¹ Read at the meeting of the Society of Nuclear Medicine, Bal Harbour, Florida, June 17 to 19, 1965.

² Section of Clinical Pathology, Mayo Clinic and Mayo Foundation.

³ Medical Applications Division, IBM Corporation.

⁴ Applied Mathematics Division, IBM Corporation.