X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1989-09-06
1992-01-14
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
378 62, 378159, 358111, G01N 2304
Patent
active
050816594
ABSTRACT:
Method and apparatus for variably compensating a radiographic image irradiates the patient with an x-ray beam. X-ray attenuation (or transmission) variations within the patient are detected and used to modulate the x-ray beam in order to produce an image with equalized exposure and increased SNR. The beam modulation information is used to produce a beam profile image which is an image of the exposure modulation given to the x-ray beam. After the modulated x-ray beam passes through the paient, a compensated image is produced. Both the beam profile image and the compensated image are logarithmically transformed and combined. The logarithmically transformed beam profile image is selectively weighted in order to alter the appearance of the compensated image by various degrees. The combined image is then retransformed and provided to a video monitor for display. An interactive control device controls the amount of weighting to the beam profile image, thus allowing the diagnostician to vary the amount of displayed image compensation desired in the resultant image. The invention produces an image which can be retrospectively adjusted by the diagnostician, or which may be used in either dual-energy imaging systems, or as input in further digital filtering routines.
REFERENCES:
patent: 3755672 (1973-08-01), Edholm et al.
patent: 4322619 (1982-03-01), Nelson et al.
patent: 4497062 (1985-01-01), Mistretta et al.
patent: 4636850 (1987-01-01), Stewart
patent: 4670896 (1987-06-01), Klausz
patent: 4868857 (1989-09-01), Dobbins, III
Duke University
Fields Carolyn E.
Porta David P.
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