X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1998-12-22
2000-09-05
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
2502081, 25037009, 378 9812, G01T 120
Patent
active
061154512
ABSTRACT:
Described herein is a method of radiographic imaging providing low access time prior to the start of a user-requested X-ray exposure, while at the same time reducing or eliminating the imaging artifacts associated with short access times. The method includes the steps of exposing a radiographic detector for a time period t.sub.e ; reading the radiographic detector to obtain an exposure reading; reading the radiographic detector to obtain an offset reading, wherein the offset reading is obtained after a time period t.sub.w greater than t.sub.e ; and subtracting the offset reading from the exposure reading. Where the detector is subjected to readings lasting for periods t.sub.r prior to taking the exposure reading, detector readings lasting for t.sub.r are also taken during t.sub.w. After the final t.sub.r reading is taken during t.sub.w, the offset reading is then preferably taken after a period equal to t.sub.e. As a result, approximately the same detector sampling scheme is used both prior to and after the exposure reading (i.e., approximately the same operating conditions are imposed on the detector prior to the exposure reading and the offset reading), thereby providing more accurate offset readings and less image artifacts when the offset reading is subtracted from the exposure reading.
REFERENCES:
patent: 5038369 (1991-08-01), Nishiki
patent: 5510623 (1996-04-01), Sayag et al.
patent: 5668375 (1997-09-01), Petrick et al.
Belanger Barry Fredric
Boudry John Moore
Saunders Rowland Frederick
Cabou Christian G.
General Electric Company
Porta David P.
Price Phyllis Y.
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