Computerized tomographic scanner with shaped radiation filter

Details Computerized tomographic scanner with shaped radiation filter Computerized tomographic scanner with shaped radiation filter

1979-04-13

1981-09-08

Anderson, Bruce C.

Radiant energy

Inspection of solids or liquids by charged particles

Analyte supports

250510, G01N 2302, G21F 302

Patent

active

042886953

ABSTRACT:
The invention comprises a shaped filter and a filter correction circuitry for computerized tomographic scanners. The shaped filter is a generally U-shaped block of filter material which is adapted to be mounted between the source of radiation and the scan circle. The U-shaped block has a parabolic recess. The filter material may be beryllium, aluminum, sulphur, calcium, titanium, erbium, copper, and compounds including oxides and alloys thereof. The filter correction circuit comprises a first filter correction profile adding circuit for adding a first scaler valve to each intensity valve in a data line. The data line is operated on by a beam hardness correction polynomial. After the beam hardness polynomial correction operation, a second filter correction circuit adds a second filter correction profile consisting of a table of scalor values, one corresponding to each intensity reading in the data line.

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