Characterization of low energy Lu background on continuous LYSO blocks

Lois, Cristina; Aguiar, Pablo; Couce, B.; Iglesias, A.

doi:10.1109/nssmic.2010.6036244

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…However, this background radiation spectrum is primarily above 300 keV, and it is not expected to significantly deteriorate the performance of SPECT imaging when using low energy windows. For example, a count rate of 21 cps/cm3 (7% of the total 176 Lu spectra) was obtained for an 80 keV wide window centred at 140 keV [15]. These measurements are compatible with published data from other authors [16,17].…”

Section: Monolithic Lyso Blocksupporting

confidence: 89%

A feasibility study on the use of arrays of discrete SiPMs for MR compatible LYSO readout using Monte Carlo simulation

Aguiar¹,

Iglesias²,

Couce³

et al. 2012

J. Inst.

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This paper shows a feasibility study on the use of discrete SiPMs to read out monolithic scintillator-based detectors for use in molecular imaging applications. Monte Carlo simulations are carried out in order to evaluate the basic performance of 8 × 8 arrays of discrete SiPMs with different PDE values and compare it to conventional 64 channel multi-anode PMT (MA-PMT) readout. A detailed optical transport model was incorporated into the Monte Carlo simulation and a detector module based on a monolithic scintillator crystal of 50 × 50 × 4 mm 3 coupled to a MA-PMT was built for experimental validation. The effect of the SiPM dynamic range was also investigated by including a model of the saturation effects into the optical transport simulation. The results show that a detector module based on an array of 8 × 8 discrete SiPM devices (3 × 3 mm 2 and PDE > 32%) is feasible as a replacement of a 64 channel MA-PMT in order to read out large monolithic crystals for MR-compatible gamma cameras.

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Section: Monolithic Lyso Blocksupporting

confidence: 89%

A feasibility study on the use of arrays of discrete SiPMs for MR compatible LYSO readout using Monte Carlo simulation

Aguiar¹,

Iglesias²,

Couce³

et al. 2012

J. Inst.

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“…The background map (figure 10(b)) is not uniform. The background events are more prominent at the edges of the scintillator, where the probability that the 176 Lu gamma decays are able to escape the scintillator without interaction is higher (Lois et al 2010). Additionally, a grid pattern is observed.…”

Section: Discussionmentioning

confidence: 97%

“…Dhanasopon et al used thin pixelated LSO (pixel size 2 mm × 2 mm, 3 mm thick) and an H8500 PSPMT to build a miniature gamma-ray camera. Lois et al (2010) coupled a 51 mm × 51 mm × 4 mm continuous LYSO crystal to a Hamamatsu H8500 PSPMT and measured the LYSO background for a 100-180 keV window. They conclude that the LYSO background should not deteriorate the performance of a SPECT system.…”

Section: Introductionmentioning

confidence: 99%

A high resolution SPECT detector based on thin continuous LYSO

2013

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Single-photon emission computed tomography (SPECT) detectors with improved spatial resolution can be used to build multi-pinhole SPECT systems that have a higher sensitivity or a higher spatial resolution. In order to improve the spatial resolution we investigate the performance of a 2 mm thick continuous Lutetium Yttrium Orthosilicate (LYSO) scintillator and compare it to the performance of a 5 mm thick continuous NaI(Tl) scintillator. The advantages of LYSO are its high stopping power and its non-hygroscopicity. Drawbacks are the lower light output and the intrinsic radioactivity. The hypothesis of this study is that such a thin LYSO scintillator will have a small light spread and, as a consequence, will also have an improved spatial resolution when coupled to a Hamamatsu H8500 position sensitive photomultiplier tube. To optimize the spatial resolution and the useful detector area we used a mean nearest neighbor event-positioning method. Beam source measurements ((99m)Tc, 140 keV) were done to investigate the energy resolution and the spatial resolution of both detectors. The effect of the intrinsic radioactivity of the LYSO scintillator in the energy window was quantified. The mean energy resolution is 9.3% for the NaI(Tl) scintillator and 21.3% for the LYSO scintillator. The LYSO spectrum shows an X-ray escape peak which decreases the detection efficiency with 9.1%. The spatial resolution of the LYSO detector (0.93 mm full width at half maximum (FWHM)) is superior to the spatial resolution of the NaI(Tl) detector (1.37 mm FWHM). The intrinsic radioactivity in the energy window (42% window centered at 140 keV) is low (125.6 cps, 0.024 cps mm(-3)). LYSO is a promising scintillator for small-animal SPECT imaging, where spatial resolution is more important than energy resolution.

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“…2, has dimensions of 23 × 23 × 30 mm 3 and is encapsulated in an aluminium case Table 1: The table summarises the main properties of a traditional NaI:Tl, a LYSO:Ce, and CeBr 3 (LB) crystals. The values regarding the NaI:Tl are taken from [32,33]; the ones for LYSO:Ce are from [29] and [34]; the numbers for CeBr 3 (LB) are as reported in [31]. The estimated total activity of the LYSO:Ce is about forty times higher than that of the CeBr 3 (LB).…”

Section: The Scintillatormentioning

confidence: 99%

“…The table summarises the main properties of a traditional NaI:Tl, a LYSO:Ce, and CeBr 3 (LB) crystals. The values regarding the NaI:Tl are taken from [32,33]; the ones for LYSO:Ce are from [29] and [34]; the numbers for CeBr 3 (LB) are as reported in [31]. The estimated total activity of the LYSO:Ce is about forty times higher than that of the CeBr 3 (LB).…”

Section: Jinst 14 P09017mentioning

confidence: 99%

Characterisation of a CeBr₃(LB) detector for space application

et al. 2019

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A: We describe the performance of a 23 × 23 × 30 mm 3 low background cerium bromide, CeBr 3 (LB), scintillator crystal coupled to a Hamamatsu R11265U-200 photomultiplier. This detector will be the building block for a gamma-ray detector array designed to be the payload for a CubeSat to be launched in 2020. The aim of the mission is to study flashes of gamma rays of terrestrial origin. The design of the detector has been tuned for the detection of gamma rays in the 20 keV-3 MeV energy range. K: Gamma detectors; Photon detectors for UV, visible and IR photons (vacuum); Scintillators and scintillating fibres and light guide; Scintillators, scintillation and light emission processes 1Corresponding authors.

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Characterization of low energy Lu background on continuous LYSO blocks

Cited by 3 publications

References 9 publications

A feasibility study on the use of arrays of discrete SiPMs for MR compatible LYSO readout using Monte Carlo simulation

A feasibility study on the use of arrays of discrete SiPMs for MR compatible LYSO readout using Monte Carlo simulation

A high resolution SPECT detector based on thin continuous LYSO

Characterisation of a CeBr₃(LB) detector for space application

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Characterization of low energy Lu background on continuous LYSO blocks

Cited by 3 publications

References 9 publications

A feasibility study on the use of arrays of discrete SiPMs for MR compatible LYSO readout using Monte Carlo simulation

A feasibility study on the use of arrays of discrete SiPMs for MR compatible LYSO readout using Monte Carlo simulation

A high resolution SPECT detector based on thin continuous LYSO

Characterisation of a CeBr3(LB) detector for space application

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Characterisation of a CeBr₃(LB) detector for space application