Tomography window-level gamma functions

Details Tomography window-level gamma functions Tomography window-level gamma functions

1981-11-13

1984-03-20

Krass, Errol A.

Boots, shoes, and leggings

358111, 358166, 364571, 378901, 382 6, 382 54, G06F 1542, H04N 514

Patent

active

044384955

ABSTRACT:
Apparatus for applying a gamma correction to digital CT numbers at a selected level and within a window. A memory is loaded sequentially with the gamma correction lookup table. At the start a counter generates a sequence of addresses, in response to clock pulses. These are addresses to another memory. Simultaneously, a variable address generator addresses the gamma lookup table memory to effect transfer of the gamma correction data to the other memory (window-gamma lookup table) at locations that are represented by the ratio of the locations in the gamma lookup table to the address in the window-gamma table. To read out and produce an image, the window black value is subtracted from the stored CT numbers in sequence. The resulting differences constitute addresses to the window-gamma lookup table whose output is then the gamma corrected values for CT numbers in the window. This digitized data is converted to analog video signals for driving a television monitor that displays the image.

REFERENCES:
patent: 4105922 (1978-08-01), Lambert et al.
patent: 4217641 (1980-08-01), Naparstek
patent: 4323977 (1982-04-01), Arseneau
patent: 4394688 (1983-07-01), Iida et al.

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