Method and apparatus for x-ray or gamma -ray 3-d tomography using a fan beam

Patent · Tue May 25 04:00:00 EDT 1982

OSTI ID:5104337

Boyd, D P

A fan-shaped beam of penetrating radiation, such as x-ray or gamma -ray radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadowgraph of transmission or absorption of the penetrating radiation by the body. A number of such shadowgraphs are obtained for different angles of rotation of the fan-shaped beam relative to the center of the slice being analyzed. The detected fan beam shadowgraph data is reordered into shadowgraph data corresponding to sets of parallel paths of radiation through the body. The reordered parallel path shadowgraph data is then convoluted in accordance with a 3-d reconstruction method by convolution in a computer to derive a 3-d reconstructed tomograph of the body under analysis. In a preferred embodiment, the position sensitive detector comprises a multiwire detector wherein the wires are arrayed parallel to the direction of the divergent penetrating rays to be detected. A focussed grid collimator is interposed between the body and the position sensitive detector for collimating the penetrating rays to be detected. The source of penetrating radiation is preferably a monochromatic source.

• Assignee: Stanford, Leland Junior Univ Trustees
• Patent Number(s): US RE 30947
• OSTI ID: 5104337
• Country of Publication: United States
• Language: English

Related Subjects

550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
BEAM OPTICS
COLLIMATORS
DESIGN
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MEASURING INSTRUMENTS
RADIATION DETECTORS
RADIATIONS
SHADOW EFFECT
TOMOGRAPHY
X RADIATION