Variable x-ray beam modulator for wide field angiography

Details Variable x-ray beam modulator for wide field angiography Variable x-ray beam modulator for wide field angiography

H - Electricity

01

J

358/27

H01J 35/02 (2006.01) G01N 23/04 (2006.01) H01J 35/14 (2006.01)

Patent

CA 2030766

VARIABLE X-RAY BEAM MODULATOR FOR WIDE-FIELD ANGIOGRAPHY ABSTRACT OF THE DISCLOSURE A computer-controlled, motor-driven shutter assembly to be used with the X-ray tube of a large field angiographic system. The shutter assembly installed onto the angiography system enables to compensate for different patient anatomy by reducing the relative X-ray exposure time from the feet to the abdomen of the patient, so as to achieve uniform radiographic exposure, without affecting the X-ray beam hardness. The X-ray exposure time reduction is obtained by gradually masking the X-ray beam during each exposure from the feet to the abdomen, through use of a motor-driven lead shutter. A radiation sensor detects the beginning of every X-ray beam exposure at the upper (leading) port of the large field, X-ray beam tube and in turn, triggers a shutter controlling circuitry. The X-ray exposure time of the patient from feet to abdomen is reduced according to computer- generated attenuation curves and gradients of patient contour. In consequence, body contrast remains high and constant from feet to abdomen and from patient to patient.

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