High Rate Photon Counting CT Using Parallel Digital PET Electronics

Recent developments in detectors and electronics enable both positron emission tomography (PET) and X-ray computed tomography (CT) data to be acquired concurrently using the same detection front-end for dual-modality PET/CT imaging. Moreover, it would potentially allow substantial reduction of cost...

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Bibliographic Details
Published inIEEE transactions on nuclear science Vol. 55; no. 1; pp. 40 - 47
Main Authors Riendeau, J., Berard, P., Viscogliosi, N., Tetrault, M.-A., Lemieux, F., Lecomte, R., Fontaine, R.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2008
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Computed tomography
Costs
Counting
Detectors
Digital
Digital signal processing
Electronics
Image fusion
Impulse response
Optical imaging
photon-counting
Photons
Polyethylene terephthalates
Positron emission tomography
positron emission tomography/computed tomography (PET/CT)
Signal processing
Tomography
X-ray detection
X-ray detectors
X-ray imaging
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Summary:Recent developments in detectors and electronics enable both positron emission tomography (PET) and X-ray computed tomography (CT) data to be acquired concurrently using the same detection front-end for dual-modality PET/CT imaging. Moreover, it would potentially allow substantial reduction of cost and housing size, in addition to facilitating image fusion. However, the lower energy signals ( ~60 keV versus 511 keV) and higher photon flux per pixel ( > 1 Mcps versus 10 kcps) in CT relative to PET cause significant pile-up and dead-time in CT data acquired in photon counting mode. A digital signal processing method was developed and implemented to improve processing of detector signals sampled at low frequency (~ 45 MHz) in presence of pile-up. The method consists in digitally subtracting the detector impulse response at the output of the preamplifier to restore the signal baseline for more accurate energy estimation. When compared to a fixed threshold counting technique, the proposed method features better noise immunity, higher energy resolution and 50% higher rates measured at an estimated true rate of 2.75 Mcps, making CT integration within modern digital PET hardware feasible.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2007.914320