Tomographic x-ray apparatus for producing transverse layer image

Details Tomographic x-ray apparatus for producing transverse layer image Tomographic x-ray apparatus for producing transverse layer image

1977-04-15

1979-02-06

Church, Craig E.

Radiant energy

Inspection of solids or liquids by charged particles

Analyte supports

250402, G03B 4116

Patent

active

041386108

ABSTRACT:
In the illustrated embodiment, a series of detectors subject to additive errors in measurement due to high voltage variations is provided with a reference channel having a detector or an equivalent component which is not exposed to the radiation, but which is responsive to high voltage fluctuations. The output from the reference channel during each measurement cycle is supplied to multiplier circuitry which receives from each channel as a second input a stored constant representing the deviation in sensitivity of the channel detector as compared to the reference detector or equivalent. The output from the multiplier is combined with the measured value from such channel by means of a subtractor circuit so as to correct the output from the channel for the errors introduced by fluctuations in the high voltage supply.

REFERENCES:
patent: 3946234 (1976-03-01), Hounsfield

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