Title: Method of producing a representation of a planar section of a body using scanning radiology

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Claims: What I claim is:

1. A method of producing a representation of the absorption of elements in a planar section of a body in response to an examination of the body with penetrating radiation such as X- or .gamma.- radiation including the steps of:

i. deriving a respective edge value indicative of the absorption suffered by said radiation on traversing each of a plurality of substantially co-planar paths of which at least some intersect, the cross sectional dimensions of each ray being small compared with the dimensions of the body,

ii. performing a transformation process upon said edge values to provide mesh signals indicative of a first estimate of the values of the coefficient of radiation absorption of respective ones of a plurality of elements in a matrix of elements notionally delineated in said body in the plane of said paths, and

iii. operating upon said mesh signals by:

a. deriving, from said mesh signals, further edge values indicative of the values which respective ones of said first mentioned edge values should assume if the said mesh signals are correct,

b. comparing said first edge values with respective ones of said further edge values to derive edge error signals,

c. transforming said edge error signals to mesh error signals indicative of errors in said mesh signals, and

d. changing said mesh signals in accordance with said mesh error signals.

2. A method according to claim 1 wherein said transformation process is an integral convolution process.

3. A method according to claim 1 wherein the transformation of said edge error signals into mesh error signals is effected in accordance with the same transformation process used to provide said mesh signals from said edge values.

Other info:

Inventors: Percival, William Spencer (London, EN)

Application Number: 455394
Filing Date: 1974-03-27
Publication_date: 1976-02-03
Assignee: EMI Limited (Hayes, EN)
Primary Class(es): 250/336.1 250/362, 250/369, 378/901
Other Classes:
US Patent Ref:

3778614

Dec, 1973

Hounsfield

250/362.

Other Refs:
Primary Examiner: Willis, Davis L.
Assistant Examiner:
Attorney: Fleit & Jacobson