Tomographic scanning apparatus with ionization detector means
An axial tomography system is disclosed which includes an assembly rotatable about an axis extending along a central opening defined therein, and means for positioning the body portion to be examined within the central opening so that the axis of assembly rotation is perpendicular to a plane passing through the bodily structures to be examined. A source of penetrating radiation is mounted on the assembly toward one side thereof and provides radiation in the form of a fan beam. Means are provided for rotating the assembly so that the fan beam impinges upon said body portion at a plurality of incident directions. Detector means for the radiation are positioned on the assembly opposite the source, enabling detection of radiation which traverses laterally and is not absorbed in the thin body section in which the aforementioned plane resides. The detector means is preferably of the ionization type, and may comprise an array of side-by-side elongated cells, the principal axis of each cell being oriented along a radius extending toward the radiation source. Collimating means overlie the detector means and serve to assure that the radiation incident on each cell is only that which has passed through an appropriate element of the body portion being examined.
- Assignee:
- General Electric Co
- Patent Number(s):
- US 4217498
- Application Number:
- TRN: 81-001199
- OSTI ID:
- 6855829
- Resource Relation:
- Patent File Date: Filed date 20 Jun 1978
- Country of Publication:
- United States
- Language:
- English
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Tomographic scanning apparatus with ionization detector means
Tomographic scanning apparatus with ionization detector means