Tomographic X-ray apparatus for the production of transverse lay

Details Tomographic X-ray apparatus for the production of transverse lay Tomographic X-ray apparatus for the production of transverse lay

1977-03-08

1979-11-13

Church, Craig E.

Radiant energy

Inspection of solids or liquids by charged particles

Analyte supports

250416TV, 250491, G03B 4116

Patent

active

041744810

ABSTRACT:
In order to facilitate exact positioning of a patient relative to tomographic X-ray apparatus the patient is moved longitudinally of the apparatus and the apparatus is retained in a limited angular relationship and operated to produce successive sets of transmittance readings to define a radiographic image having a longitudinal extent sufficient to encompass the precisely desired region of the patient for which a tomographic image is to be generated. The stored sets of readings may be reproduced on a conventional television display unit along with suitable reference means coordinated with the patient's longitudinal position in the apparatus. The radiograph even though taken in a single angular relationship can still provide sufficient information to permit selection of the precise desired patient longitudinal position relative to the tomographic apparatus, whereupon the tomographic apparatus is operated in the usual manner for scanning of the selected transverse layer over a wide range of angles but with a fixed relative longitudinal relationship. Advantageously, the scanner may present a fan-type beam which in a fixed angular relationship to the patient still scans a substantial portion of the patient cross section, the X-ray source or sources being pulsed at successive longitudinal positions of the patient relative to the scanning apparatus, and the successive sets of readings being utilized for on line display of a radiograph covering the desired longitudinal extent.

REFERENCES:
patent: 3974388 (1976-08-01), Distler
patent: 4047044 (1977-09-01), Weaver
patent: 4051379 (1977-09-01), Zacher

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