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Title: Apparatus for examining objects by means of penetrating radiation



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Claims: What I claim is:

1. A medical radiographic apparatus including,

a. a source, arranged to irradiate a slice of an object with radiation projected in different directions in a substantially planar fan-shaped distribution about a mean direction,

b. detector means, sensitive to the radiation and disposed to receive and to provide output signals indicative of the intensity of radiation emergent from the object in the plane of the distribution,

c. means for moving the source and the detector means, in the plane of the distribution, relative to the object, to irradiate the object from a plurality of different mean directions,

d. means for processing the output signals provided by the detector to derive a representation of the variation of absorption of the radiation in said slice of the object and,

e. means adapted to compensate for variations in the hardness of radiation projected in different directions in the plane of the distribution.

2. An apparatus according to claim 1 wherein said means adapted to compensate is a further object, disposed in the path of the radiation, having different absorptions for radiation emitted at different directions in the plane of the distribution.

3. An apparatus according to claim 2 wherein said further object has an absorbing path length, to the radiation, which is continuously variable with angular position, relative to the source, in the plane of the distribution.

4. An apparatus according to claim 3 wherein said further object is wedge-shaped.

5. An apparatus according to claim 2 wherein said further object is disposed between the source and the first mentioned object.

Other info:


Inventors: Hounsfield, Godfrey Newbold (Newark, EN)

Application Number: 659155
Filing Date: 1976-02-18
Publication_date: 1978-01-17
Assignee: E M I Limited (Hayes, EN)
Primary Class(es): 378/5 378/159
Other Classes:
US Patent Ref:
3134903May, 1964Fengler250/510.
3432657Mar, 1969Slavin250/369.
3737660Jun, 1973Ando et al.250/445.
3755672Aug, 1973Edholm et al.250/510.
3778614Dec, 1973Hounsfield250/360.

Other Refs:
Primary Examiner: Borchelt, Archie R.
Assistant Examiner:
Attorney: Fleit & Jacobson