Rotational angiography dye and mask image acquisition and synchr

Details Rotational angiography dye and mask image acquisition and synchr Rotational angiography dye and mask image acquisition and synchr

1996-06-21

1997-10-28

Wong, Don

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378 9812, 378146, H05G 164

Patent

active

056824130

ABSTRACT:
A patient is positioned on a patient support (12) and a gantry (16) carrying an x-ray source (10) and a radiation detector assembly (14) are rotated around the subject. The detector assembly includes a video camera (28) which is run in a synchronous mode to generate a first plurality of images at regular temporal intervals T.sub.blanking. Because each image requires a finite time for generation, it is acquired over an interval of arc between a starting angular orientation (A.sub.S .degree., B.sub.S .degree.) and a terminal angular orientation (A.sub.T .degree., B.sub.T .degree.). A position encoder (40) monitors the terminal positions of each of the first series of images. The patient is then injected with a radiographic dye and the gantry is rotated in a reverse direction. A comparator compares the stored terminal angular positions of each forward direction image and the current angular position of the gantry. A trigger circuit (54) triggers an asynchronous mode x-ray exposure controller (50) such that a video image is commenced at each terminal angular orientation. Images generated over substantially the same arc segment are subtracted (66) to form a difference image for storage in a difference image memory (68) and display on a monitor (72).

REFERENCES:
patent: 4896211 (1990-01-01), Hunt et al.
patent: 4922337 (1990-05-01), Hunt et al.
patent: 4949172 (1990-08-01), Hunt et al.
patent: 5040057 (1991-08-01), Gilblom et al.
patent: 5301220 (1994-04-01), Wong
patent: 5386452 (1995-01-01), Toki

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