Fast Charge to Pulse Width Converter for Monolith PET Detector

Parl, C.; Larue, H.; Streun, M.; Ziemons, K.; Waasen, S. van

doi:10.1109/tns.2012.2209128

Cited by 18 publications

(11 citation statements)

References 11 publications

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“…It had been introduced by Zhi et al [7]. The model assumes a single interaction point (x,y,z) within the scintillator as an isotropic light source.…”

Section: ) Least Square Optimization (Ls)mentioning

confidence: 99%

“…C 0 represents diffuse light that gets reflected on the crystal surfaces. Regular reflections from polished surfaces would have to be taken into account by additional mirror source terms [7], but this is not the case for the scintillator in our setup which has rough side faces. The solid angle can be approximated to…”

Section: ) Least Square Optimization (Ls)mentioning

confidence: 99%

“…The approximation is valid only for large distances between interaction point and pixel, but simulation studies showed that the deviation from an exact calculation is negligible [7]. The experimental data provide the light distribution on the pixels as eight row values row n and eight column values col m and consequently the pixel intensities Nph nm have to be summed in order to generate the corresponding row and column intensities.…”

Section: ) Least Square Optimization (Ls)mentioning

confidence: 99%

“…The first is an Artificial Neural Network approach (ANN) which requires a training process with prerecorded data but has the ability to adapt to imperfections of the individual detector as inhomogeneous optical coupling or scintillator light yield or non-uniform photodetector gain. The second algorithm is a Least Square Optimization (LS) based on the model that each scintillation event is localized in a single interaction point and that the signal of each photodetector element is proportional to the solid angle covered by its area [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Position reconstruction in monolithic block detectors

Streun

Nöldgen

Kemmerling

et al. 2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

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Abstract-In high resolution PET systems the detector generally uses a scintillator which consists of individual pixel elements. The scintillation light of such a pixel element will be identified and thus the interaction is localized by the pixel position. Consequently, the delivered position of such a detector can only take discrete values.A different approach is the monolithic scintillator detector. A continuous scintillator block spans over an area of several photodetector pixels and the position is reconstructed from the recorded light distribution. Manufacturing of this detector is easier and the sensitivity is generally higher as no scintillating material is wasted for optical isolation between the pixels. But the challenge is to find a dedicated algorithm in order to identify the interaction position with sufficient resolution.We will present measurements of a monolithic scintillator detector (21×18×10mm 3 LYSO) and compare different reconstruction methods. Already a Least Square Optimization algorithm based on a rather simple model delivers a resolution similar to an Artificial Neural Network approach but which requires pre-registered data for training. The comparison of the resolution to that of a pixelated detector of similar size and 2×2×10mm 3 pixels shows the superior performance of the continuous block.

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“…It had been introduced by Zhi et al [7]. The model assumes a single interaction point (x,y,z) within the scintillator as an isotropic light source.…”

Section: ) Least Square Optimization (Ls)mentioning

confidence: 99%

Section: ) Least Square Optimization (Ls)mentioning

confidence: 99%

Section: ) Least Square Optimization (Ls)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Position reconstruction in monolithic block detectors

Streun

Nöldgen

Kemmerling

et al. 2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

View full text Add to dashboard Cite

show abstract

“…As it can be implemented without an independent analog-to-digital converter, The ToT method has advantages over conventional pulse height systems in terms of circuit integration and power consumption. Although ToT is attractive, the relation between input charge and time width of the output pulse is strongly non-linear [4,5]. To correct this, we propose a new dynamic time over threshold (dToT) [6] principle in which linearity can be significantly improved through the use of an independent pulse shaping section.…”

Section: Introductionmentioning

confidence: 99%