Tomographic apparatus and method for reconstructing planar slices from non-absorbed and non-scattered radiation

Patent · Tue Dec 21 00:00:00 EST 1982

OSTI ID:6516612

Nunan, C S; Pavkovich, J M

In a tomographic apparatus and method for reconstructing two dimensional planar slices from linear projections of non-absorbed radiation useful in the fields of medical radiology, microscopy, and non-destructive testing, a beam of radiation in the shape of a fan is passed through an object lying in the same quasi plane as the object slice and non-absorption thereof is recorded on oppositely situated detectors aligned with said source of radiation. There is relative rotation between the source-detector configuration and the object within the quasi-plane. Periodic values of the detected radiation are taken, convolved with certain functions, and back-projected to produce a twodimensional output picture on a visual display illustrating a facsimile of the object slice. A series of two-dimensional pictures obtained simultaneously or serially can be combined to produce a three-dimensional portrayal of the entire object. The invention is the first device which uses a fan beam source of radiation coupled with the application of a convolution method of data reduction with no intervening reordering of fan beam rays, thereby eliminating errors and delays in computation time which would be involved in such reordering. The invention is the first method for providing an exact reconstruction of a two-dimensional picture of an object slice from a series of one-dimensional projections of radiation not absorbed by the slice when the superior fan beam source is employed.

• Assignee: General Electric Co.
• Patent Number(s): US 4365339
• OSTI ID: 6516612
• Resource Relation: Patent File Date: Filed date 11 Sep 1978; Other Information: PAT-APPL-941506
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
COMPUTERIZED TOMOGRAPHY
ABSORPTION
BEAM SHAPING
RADIATION DETECTORS
RADIOLOGY
ROTATION
X RADIATION
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MEDICINE
MOTION
NUCLEAR MEDICINE
RADIATIONS
TOMOGRAPHY
550602* - Medicine- External Radiation in Diagnostics- (1980-)