Gantry position reference for tomographic scanners

Details Gantry position reference for tomographic scanners Gantry position reference for tomographic scanners

1992-05-11

1992-12-29

Hannaher, Constantine

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 94, 378 15, 378101, H05G 166

Patent

active

051757540

ABSTRACT:
A CT apparatus produces a trigger position signal having a programmable angular spacing, for triggering the acquisition of projections, from an encoder index pulse having a different fixed angular spacing. An estimation circuit estimates the time of occurrence of a next pulse in the trigger position signal by evaluating the timing of the encoder index pulses. The estimation circuit may be a phase-locked-loop or a set of lookup tables keyed to gantry position and speed.

REFERENCES:
patent: 4620313 (1986-10-01), Erker

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