Title: Apparatus for examining objects by means of penetrating radiation

Abstract: In an apparatus for examining a body by means of penetrating radiation, a source directs a fan-shaped distribution of radiation through a slice of a patient. Detectors disposed on the other side of the body provide measurements of the intensity of the radiation for processing to derive a representation of absorption in the slice. Variations of the hardness of the radiation, with angular position in the fan-shaped distribution, can cause errors in the representation. Means are provided for compensating such variations of hardness; the means being in one example a wedge-shaped compensator inserted into the path of the radiation.

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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:

3134903	May, 1964	Fengler	250/510.
3432657	Mar, 1969	Slavin	250/369.
3737660	Jun, 1973	Ando et al.	250/445.
3755672	Aug, 1973	Edholm et al.	250/510.
3778614	Dec, 1973	Hounsfield	250/360.

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