Radioscopic image device

Details Radioscopic image device Radioscopic image device

1986-10-22

1988-11-15

Church, Craig E.

X-ray or gamma ray systems or devices

Beam control

Scanner

378145, 378156, 378157, G21K 510

Patent

active

047854715

ABSTRACT:
A radioscopic image former comprises a slit between an X-ray source and a subject to produce an X-ray fan beam to scan the subject. The transmission of the slit is adjusted locally during the scanning depending on local absorptions in the subject. The X-ray fan beam is cyclically modulated. The local modulation frequency depends on the coordinate in the longitudinal direction of the slit. The slit comprises a number of tongues each tongue being excited at or near its resonant frequency. Each tongue has its own frequency or phase and acts as a frequency-selective element.

REFERENCES:
patent: 4626688 (1986-12-01), Barnes
patent: 4639941 (1987-01-01), Hounsfield
patent: 4675893 (1987-06-01), Duinker et al.
patent: 4677652 (1987-06-01), Duinker et al.

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