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SWITCHED SIGNAL SUMMING FOR SINGLES REJECTION IN POSITRON EMISSION TOMOGRAPHY (PET) SYSTEM

IP.com Disclosure Number: IPCOM000245737D
Publication Date: 2016-Apr-04
Document File: 3 page(s) / 32K

Publishing Venue

The IP.com Prior Art Database

Abstract

A technique for optimizing digitization electronics of a positron emission tomography (PET) system is disclosed. According to the technique described herein, a rough time stamp is sent from each application specific integrated circuit (ASIC) to a global coincidence detector. When a rough coincidence is detected the ASIC with the coincidence is identified. A pass through switch for output of the ASIC identified is activated to allow the signal to pass to an analog to digital converter (ADC). Accordingly, single ADC serves multiple ASICs without degradation in noise or single event count rate.

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SWITCHED SIGNAL SUMMING FOR SINGLES REJECTION IN POSITRON EMISSION TOMOGRAPHY (PET) SYSTEM

BACKGROUND

 

The present disclosure relates generally to positron emission tomography (PET) systems and more particularly to optimizing digitization electronics of the PET system.

One large component cost of the PET system is the digitization electronics. Various conventional techniques have been used to reduce the number of digitization channels. However, these conventional techniques involve a trade-off with noise as the area served by each digitization channel increases. Further, since each digitization channel is limited by the number of single events entering, increasing area served by each digitization channel reduces count rate capability of the system.

While some other conventional techniques include blocking energy signals from being digitized based on coincidence timing, some conventional techniques block or truncate processing of the energy signal, not the energy signal.

It would be desirable to have an efficient technique for reducing the detector area per analog-to-digital converter (ADC) channel of PET systems.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 depicts a central coincidence detection circuit for detecting two events occurring within a rough time window according to a technique for optimizing digitization electronics of a positron emission tomography (PET) system.

DETAILED DESCRIPTION

A technique for optimizing digitization electronics of a positron emission tomography (PET) system is disclosed. According to the technique described herein, a rough time stamp is sent from each application specific integrated circuit (ASIC) to a global or central coincidence detector. When a rough coincidence is detected the ASIC with the coincidence is identified. A pass through switch for output of the ASIC identified is activated to allow the signal to pass to an analog to digital converter (ADC). Accordingly, single ADC serves multiple ASICs without degradation in noise or single event count rate.

According to an embodiment, the timing information from each single event is digitized with a rough, for example about 5 ns time stamp. This time stamp is then passed to a central coincidence detection circuit along with the ID of the ASIC associated with the time stamp. If the central coincidence dete...