X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1983-12-15
1986-02-11
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 4, G03B 4116
Patent
active
045702640
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 automatically 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 to the patient still scans a substantial portion of the patient cross section, the sets of readings for successive patient sections, e.g. offset by one millimeter, being stored in digital form, and utilized for on line display of a radiograph covering the desired longitudinal extent.
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Church Craig E.
Siemens Aktiengesellschaft
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