Rotational digital subtraction angiography phantom

Details Rotational digital subtraction angiography phantom Rotational digital subtraction angiography phantom

1997-01-14

1998-01-27

Wong, Don

X-ray or gamma ray systems or devices

Accessory

Testing or calibration

378 4, G01D 1800

Patent

active

057128952

ABSTRACT:
A gantry (18) that carries an x-ray source (14) and an x-ray detector (16) rotates around a test phantom (10) in a forward direction. A plurality of forward projection images are generated and stored in a forward image memory (42). The angle at which each forward direction projection image is generated is stored in a position memory (56). The gantry is then rotated in a reverse direction and a reverse direction image is generated at generally the same angular positions as in the forward rotation direction. The forward and reverse direction projection images of the phantom are analyzed to determine an offset or error between each corresponding forward and reverse angular image position. The offsets are stored in an angular position look-up table (80) and a pixel reregistration look-up table (82). In subsequent reverse scans, the angular position at which the reverse direction projection images are taken are altered in accordance with the angular offset for the corresponding angular position. The forward sweep images are video pixel position shifted in accordance with the video pixel offset for the corresponding angular position to bring the forward and reverse direction projection images into registration.

REFERENCES:
patent: 5225979 (1993-07-01), Feldman et al.
patent: 5301220 (1994-04-01), Wong
patent: 5442674 (1995-08-01), Picard et al.

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