Adaptive baseline correction for gamma camera
US5847395A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1996 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Oct 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/81
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Signal processing circuitry for use in medical imaging includes a flash analog-to-digital converter (FADC) for digitizing signals from a sensor; a memory for storing a plurality of digitized signals prior to a current event; and a processor for generating an adjustment signal from the plurality of digitized signals to adjust a first signal corresponding to the current event. In a fast time scale event processing, the signal processing circuitry generates an adjustment signal in near real-time corresponding to an analog error which is computed and updated from signals just prior to an event. In an alternative embodiment, the signal processing circuitry includes an FADC which generates the plurality of signals from a plurality of pseudo-event signals; and a digital-to-analog converter (DAC) is used for generating the pseudo-event signals between a previous event and the current event. A data fitting circuit is included for performing linear fitting of data corresponding to the plurality of signals to generate the adjustment signal. The baseline shifts and other effects of DC drift are corrected to improve event localization in the medical imaging system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.