Method for calibration of an axial tomographic scanner

Patent · Tue Oct 11 04:00:00 EDT 1977

OSTI ID:5237788

Sparks, R A

The method of calibrating an axial tomographic scanner including frame means having an opening therein in which an object to be examined is to be placed, source and detector means mounted on the frame means for directing one or more beams of penetrating radiation through the object from the source to the detector means, and means to rotate the scanner including the source and detector means about the object whereby a plurality of sets of data corresponding to the transmission or absorption by the object of a plurality of beams of penetrating radiation are collected; the calibration method comprising mounting calibration means supporting an adjustable centering member onto the frame means, positioning the adjustable centering member at approximately the center of rotation of the scanner, placing position-sensitive indicator means adjacent the approximately centered member, rotating the scanner and the calibration means mounted thereon at least one time and, if necessary, adjusting the positioning of the centering member until the centering member is coincident with the center of rotation of the scanner as determined by minimum deflection of the position-sensitive indicator means, rotating and translating the source and detector means and determining for each angular orientation of the frame means supporting the source and detector means the central position of each translational scan relative to the centered member and/or if a plurality of detectors are utilized with the detector means for each planar slice of the object being examined, the central position of each translational scan for each detector relative to the centered member.

• Assignee: Syntex (U.S.A.) Inc.
• Patent Number(s): US 4053780
• OSTI ID: 5237788
• Country of Publication: United States
• Language: English

Related Subjects

550600* -- Medicine
62 RADIOLOGY AND NUCLEAR MEDICINE
BIOMEDICAL RADIOGRAPHY
CALIBRATION
DATA ANALYSIS
DIAGNOSTIC TECHNIQUES
GAMMA SOURCES
GEOMETRY
MATHEMATICS
MEASURING INSTRUMENTS
MEDICINE
NUCLEAR MEDICINE
PATIENTS
RADIATION DETECTORS
RADIATION SOURCES
RADIOLOGY
TOMOGRAPHY
X-RAY EQUIPMENT
X-RAY SOURCES