Abstract
A novel digital PET scanner based on Time over Threshold method is developed. The positron emission tomography (PET) is composed of 144channel Ce:Gd3Al2Ga3O12 (GAGG)-Avaranche photodiode (APD) detector arrays individually coupled with custom designed Time over Threshold (ToT) application-specific integrated circuit (ASIC) to realize the high count rate and good spatial resolution. Such an imaging system provides a simple front-end circuit and flexible digital signal processing like multiplexing such as a pulse train method. The measured energy resolution of the detector system was 6.7% for the 511 keV peak, and 4.25 ns time resolution was measured with a single detector module. The measured spatial resolution for a point source was 1.37 mm FWHM for our initial data with a columnar 22Na source.
Original language | English |
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Article number | 6722988 |
Pages (from-to) | 348-352 |
Number of pages | 5 |
Journal | IEEE Transactions on Nuclear Science |
Volume | 61 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2014 Feb |
Keywords
- Avalanche photodiode (APD)
- Positron emission tomography (PET)
- Scintillator
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- Electrical and Electronic Engineering