Depth of interaction detection with enhanced position-sensitive proportional resistor network

Lerche, Christoph; Benlloch, J.; Sánchez, F.; Pavón, N.; Gimenez, N.; Fernandez, M.; Gimenez, M. V. Castillo; Sebastiá, A.; Martínez, J.D.; Mora, Francisco

doi:10.1016/j.nima.2004.08.036

Cited by 19 publications

(10 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There exist several analytical models to describe the 3Dspatial propagation of the scintillation photons produced by a single γ-ray hit or, equivalently, by a point-like photon source within the crystal volume [8,23,24]. Here we report on the implementation of algorithms based on both the model by Lerche et al [8] and the somewhat more elaborated formula by Li et al [24]. The Lerche model makes use of the inverse square law combined with an exponential factor, which accounts for photon absorption and scattering effects within the crystal.…”

Section: Analytical Model Fitmentioning

confidence: 99%

γ-Ray position reconstruction in large monolithic LaCl3(Ce) crystals with SiPM readout

Babiano

Caballero

Calvo

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

We report on the spatial response characterization of large LaCl 3 (Ce) monolithic crystals optically coupled to 8×8 pixel silicon photomultiplier (SiPM) sensors. A systematic study has been carried out for 511 keV γ-rays using three different crystal thicknesses of 10 mm, 20 mm and 30 mm, all of them with planar geometry and a base size of 50×50 mm 2 . In this work we investigate and compare two different approaches for the determination of the main γ-ray hit location. On one hand, methods based on the fit of an analytical model for the scintillation light distribution provide the best results in terms of linearity and field of view, with spatial resolutions close to ∼1 mm fwhm. On the other hand, position reconstruction techniques based on neural networks provide similar linearity and field-of-view, becoming the attainable spatial resolution ∼3 mm fwhm. For the third space coordinate z or depth-ofinteraction we have implemented an inverse linear calibration approach based on the cross-section of the measured scintillation-light distribution at a certain height. The detectors characterized in this work are intended for the development of so-called Total Energy Detectors with Compton imaging capability (i-TED), aimed at enhanced sensitivity and selectivity measurements of neutron capture cross sections via the time-of-flight (TOF) technique.

show abstract

Section: Analytical Model Fitmentioning

confidence: 99%

γ-Ray position reconstruction in large monolithic LaCl3(Ce) crystals with SiPM readout

Babiano

Caballero

Calvo

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…One can see the details in Fig.1, Fig.2 and Fig.7. Such large crystal coupled to the PSPMT allows one to additionally detect the depth of interaction of the annihilation gamma ray in the crystal (Lerche et al 2005;Lerche 2006). The position detection resolution in this continuous crystals are 1.9±0.1 mm in plane of the PSPMT (i.e.…”

Section: Methodsmentioning

confidence: 99%

Virtual PET Scanner – From Simulation in GATE to a Final Multiring Albira PET/SPECT/CT Camera

Balcerzyk¹,

Caballero²,

Correcher³

et al. 2012

Positron Emission Tomography - Current Clinical and Research Aspects

Self Cite

View full text Add to dashboard Cite

“…Instead of digitizing all photodetectors outputs, the center of gravity (COG) algorithm is widely used because its implementation by means of charge division circuits (CDC) is rather inexpensive [21,22]. We recently presented an approach for measuring the DOI in monolithic crystals with modified CDC [23][24][25]. The approach is based on the correlation between the DOI and the width of the scintillation light distribution [15,17,26], requiring only a small modification of the CDC's.…”

Section: Introductionmentioning

confidence: 99%

Fast circuit topology for spatial signal distribution analysis

Lerche

Bosch

Spaggiari

et al. 2010

2010 17th IEEE-NPSS Real Time Conference

Self Cite

View full text Add to dashboard Cite

We present a novel active and analog readout and preprocessing topology for position sensitive photodetectors (PSPD) that allows to readout a large variety of PSPD devices with different pixel numbers. Additionally, the topology was designed to allow for a significant reduction of analog-to-digital conversion channels. The circuit topology replaces the common passive charge divider and consists of N input stages, N x M weighting stages and M analog adder stages, where N is the number of the input channels, i.e. the number of photodetector pixels and M is the number of outputs. The circuit performs the multiplication of a matrix (the weights) with a vector (signals). For this, the input stage makes M copies of each of the N input signals, the weighting stage multiplies these signal copies with N x M different weights and the output stage adds all weighted copies with the same copy index. For high flexibility, the weights are programmable and the topology allows to interconnect several identical circuits for larger N. As application for the circuit, we present a Neural Network based positioning scheme for γ-ray imaging detectors with thick, monolithic scintillation crystals. We used Monte Carlo simulation for training and evaluation of the method and found that the spatial resolution of the γ-ray imaging detectors was significantly enhanced. The strong border artifacts of the center of gravity positioning scheme in monolithic scintillation crystals could be corrected to a large extent.

show abstract

Depth of interaction detection with enhanced position-sensitive proportional resistor network

Cited by 19 publications

References 7 publications

γ-Ray position reconstruction in large monolithic LaCl3(Ce) crystals with SiPM readout

γ-Ray position reconstruction in large monolithic LaCl3(Ce) crystals with SiPM readout

Virtual PET Scanner – From Simulation in GATE to a Final Multiring Albira PET/SPECT/CT Camera

Fast circuit topology for spatial signal distribution analysis

Contact Info

Product

Resources

About