Radiation detection measurements with a new “Buried Junction” silicon avalanche photodiode

Lecomte, Roger; Pépin, C.; Rouleau, D.; Dautet, H.; McIntyre, R.J.; McSween, D.; Webb, P.P.

doi:10.1016/s0168-9002(98)01182-6

Cited by 45 publications

(18 citation statements)

References 7 publications

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“…14 the timing resolution as a function of the APD bias for an LGSO sample with 0.025 mol% Ce. The timing resolution is generally degrading near APD breakdown bias voltage due to increasing noise [4], [27]. However, the APD-LGSO detectors investigated in this paper demonstrated good timing resolution that remained fairly stable over the entire APD bias range, as shown in Fig.…”

Section: B Scintillation Characteristics With Apdmentioning

confidence: 72%

Characteristics of Lu$_{1.8}$Gd$_{0.2}$SiO$_{5}$:Ce (LGSO) for APD-Based PET Detector

Shimizu

Pépin

Bergeron

2010

IEEE Trans. Nucl. Sci.

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Since its discovery in 1993, LGSO has been seen as a promising scintillator for positron emission tomography (PET) imaging. Recently, new high lutetium content Lu 1 8 Gd 0 2 SiO 5 :Ce (LGSO-90%Lu) has been produced with Ce concentration varying from 0.025 to 0.75 mol% Ce, yielding decay times in the range of 34.2 to 44.8 ns. These scintillators could potentially be used as phoswich detectors in PET for improving spatial resolution. To validate this assumption, light output, energy resolution, temperature dependence, timing resolution, and pulse-shape discrimination performance were assessed. The light output of these LGSO scintillators is 3.5 to 4.8 times higher than BGO with avalanche photodiode readout [7.5 to 8 times with photomultiplier tube (PMT)] and increases with Ce concentration. The variation of light output for temperature ranging from 10 to 50 C is less than 18% with PMT readout. Energy resolution at 662 keV is about 11% (l0%) with avalanche photodiode (APD) (PMT) readout. Timing resolution with APD is 1.65 ns for all samples relative to a fast PMT-plastic detector. Pulse-shape discrimination of LGSO-90% Lu with 0.025 mol% Ce ( = 34 2 ns) and 0.75 mol% Ce ( = 44 8 ns) was successfully achieved in a phoswich assembly, making this new high lutetium content LGSO with adjustable decay time constants a strong candidate for a high-resolution depth-of-interaction detector intended for PET imaging.

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Section: B Scintillation Characteristics With Apdmentioning

confidence: 72%

Characteristics of Lu$_{1.8}$Gd$_{0.2}$SiO$_{5}$:Ce (LGSO) for APD-Based PET Detector

Shimizu

Pépin

Bergeron

2010

IEEE Trans. Nucl. Sci.

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“…While a small gain of only 3.7%-7% in timing resolution was obtained for LYSO-LYSO coincidences, a significant improvement of 17%-22% was achieved for LGSO-LGSO coincidences. These results suggest that the filtered interpolation algorithm can achieve better performance with scintillators having a lower SNR and slower decay time such as LGSO, and also stress the importance of applying adequate APD bias for optimum performance [12], [21].…”

Section: B Sensitivity To Apd Biasmentioning

confidence: 76%

Timing Improvement by Low-Pass Filtering and Linear Interpolation for the LabPET Scanner

Fontaine

Lemieux

Viscogliosi

et al. 2008

IEEE Trans. Nucl. Sci.

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Digital processing for positron emission tomography (PET) scanners commonly relies on low frequency sampling ( 65 MHz) to reduce power consumption. Timestamps must then be interpolated between samples to achieve adequate time resolution for coincidence detection of annihilation radiation. A low-pass filter based interpolation algorithm adding up to 31 samples between original samples was designed to improve timing resolution of the LabPET scanner. A 2-bit refinement in the determination of the pulse maximum amplitude leads to a better estimation of the triggering threshold, which in turn enables a more accurate timestamp generation. Timestamp accuracy was investigated as a function of trigger level (15%-50% of maximum value). With the trigger threshold set at 20%, coincidence time resolution of 5 0 ns for LYSO-LYSO and 9 6 ns forLGSO-LGSO are obtained. A real time implementation of the algorithm was achieved in a Xilinx FPGA.

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“…Using 1 MBq of 18 F, it is possible to obtain sufficient statistics within 15 min to be able to find time offsets for the entire scanner by automatically fitting gaussian functions to the peaks. An important calibration procedure for APD-based PET scanners is to individually tune the bias of each APD detector to achieve optimum timing resolution [2,16,17]. This calibration procedure is usually computationnaly expensive and time consuming due to the large amount of coincidence data to be acquired for all LORs in the scanner FOV and to the many iterations required before an optimal setting is found.…”

Section: Methodsmentioning

confidence: 99%

A handy time alignment probe for timing calibration of PET scanners

Bergeron

Pépin

Arpin

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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Radiation detection measurements with a new “Buried Junction” silicon avalanche photodiode

Cited by 45 publications

References 7 publications

Characteristics of Lu$_{1.8}$Gd$_{0.2}$SiO$_{5}$:Ce (LGSO) for APD-Based PET Detector

Characteristics of Lu$_{1.8}$Gd$_{0.2}$SiO$_{5}$:Ce (LGSO) for APD-Based PET Detector

Timing Improvement by Low-Pass Filtering and Linear Interpolation for the LabPET Scanner

A handy time alignment probe for timing calibration of PET scanners

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