Data converter for CT data acquisition system

Details Data converter for CT data acquisition system Data converter for CT data acquisition system

1987-06-29

1989-03-21

LaRoche, Eugene R.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 4, 330284, A61B 600

Patent

active

048151181

ABSTRACT:
Improved data converter circuitry for a CT data acquisition system is disclosed which makes use of a programmable gain amplifier whose gain is set according to the magnitude of a detector input signal by selecting one of several resistor voltage-divider paths at the input of a fixed gain amplifier. An auto-zero loop uses an intergrating op-amp to provide periodic correction to offset voltage of the fixed gain amplifier. In a modified embodiment, an auto-zero loop is provided for correction of both the fixed gain amplifier and a serially-connected A/D converter.

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patent: 4667153 (1987-05-01), Doyle
patent: 4697280 (1987-09-01), Zarnstorff et al.

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