CT number identifier in a computed tomography system

Details CT number identifier in a computed tomography system CT number identifier in a computed tomography system

1977-04-11

1978-08-08

Smith, Alfred E.

Radiant energy

Inspection of solids or liquids by charged particles

Analyte supports

250369, A61B 602, G01N 2308

Patent

active

041059220

ABSTRACT:
In computed tomography, a computer calculates CT numbers corresponding with the X-ray attenuation by elemental volumes in a body undergoing an X-ray beam scan. Analog signals corresponding with the sequence of CT numbers modulate a raster scanned cathode ray tube to produce a display of the image. Means are provided for controlling the display tube to display elements within a range of CT numbers or gray scale window. New means are provided for causing zones in the image corresponding with picture elements near the selected level or center of the gray scale to blink from gray to white such that when the level is set to correspond with a gray scale level of interest, the blinking zones will have CT numbers corresponding with the level setting. This permits identification of the CT numbers of the zones. The blink mode may be activated while the full image is displayed on the screen and zones of interest may be visualized in the total picture.

REFERENCES:
patent: 4052618 (1977-10-01), Hounsfield

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