Fan beam x- or. gamma. -ray 3-D tomography

Patent · Tue Feb 21 04:00:00 EST 1978

OSTI ID:6801996

Boyd, D P; Goitein, M

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 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 shodowgraph 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: Board of Trustees of Leland Stanford Junior Univ.
• Patent Number(s): US 4075492
• OSTI ID: 6801996
• Country of Publication: United States
• Language: English

Related Subjects

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47 OTHER INSTRUMENTATION
550600 -- Medicine
62 RADIOLOGY AND NUCLEAR MEDICINE
COLLIMATORS
DESIGN
ELECTROMAGNETIC RADIATION
EQUIPMENT
GAMMA RADIATION
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
OPERATION
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RADIATIONS
TOMOGRAPHY
X RADIATION