Dual energy computerized tomography system
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United States of America Patent
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May 19, 1992
Grant Date -
N/A
app pub date -
Nov 25, 1983
filing date -
Nov 25, 1983
priority date (Note) -
Expired
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Abstract
A dual energy method for CT scanning. Scanning is carried out at low and high energy levels, S.sub.2 and S.sub.1 respectively, each at a preselected dose level. Detected electronic signals (I.sub.2,I.sub.1) are digitized. A look up table is used to generate a pair of values from each pair of signals, one a photoelectric component and the other a Compton component. Each of these values are subjected to spatial filtering by a convolution filter function for each signal specially designed to increase the signal to noise ratio in the resultant combined image by exploiting the correlation in noise in the two values.
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