Radiology, Vol 123, 361-367, Copyright © 1977 by Radiological Society of North America
An off-line image processing system for digital display in computed tomography
LE Larsen and RA Evans
Early clinical application of an off-line image processing and analysis
system for digital display in conjunction with computed tomography is
described. The system consists of three operational subsystems: (a) a
flexible disk for digital storage of absorption values in each of eight or
more tomographic planes; (b) a high-speed interactive video system which
displays the tomographic plane in correct geometry with the absorption
values, which serve as the pictorial elements; and (c) a paper hard copy of
the absorption values in a simulated gray-tone image of the tomographic
plane in which the numerical values are the pictorial elements. Both the
video and paper displays provide explicit numerical values of x-ray
attenuation for each location on the tomographic plane in an image which
combines analog and digital qualities.
