Improvement of the depth of interaction detector for PET on full energy pulse height uniformity

Kasahara, T.; Murayama, Hideo; Omura, T.; Yamashita, T.; Ishibashi, Hiroyuki; Kawai, H.; Inadama, Naoko; Umehara, Tadashi; Orita, N.; Tsuda, Tomoaki

doi:10.1109/tns.2003.817353

Cited by 11 publications

(1 citation statement)

References 19 publications

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“…The first method, having the longest history, utilizes Anger-logic detectors; the upper and lower layer crystals are projected onto a two-dimensional coordinate system, without overlapping each other, by means of optical arrangements such as comb-slits [6,10], reflectors [11,12], absorbers [13], and staggered layouts [14]. The second type of detectors, conventionally called phosphor sandwich (phoswich) detectors, can discriminate two or more kinds of scintillators owing to their pulse shapes.…”

Section: Introductionmentioning

confidence: 99%

Timing resolution improvement using DOI information in a four-layer scintillation detector for TOF-PET

Shibuya¹,

Nishikido²,

Tsuda

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Introductionmentioning

confidence: 99%

Timing resolution improvement using DOI information in a four-layer scintillation detector for TOF-PET

Shibuya¹,

Nishikido²,

Tsuda

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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Performance evaluation for 120 four-layer DOI block detectors of the jPET-D4

Inadama¹,

Murayama²,

Ono

et al. 2007

Radiol Phys Technol

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The jPET-D4 is a brain positron emission tomography (PET) scanner that we have developed to meet user demands for high sensitivity and high spatial resolution. For this scanner, we developed a four-layer depth-of-interaction (DOI) detector. The four-layer DOI detector is a key component for the jPET-D4, its performance has great influence on the overall system performance. Previously, we reported the original technique for encoding four-layer DOI. Here, we introduce the final design of the jPET-D4 detector and present the results of an investigation on uniformity in performance of the detector. The performance evaluation was done over the 120 DOI crystal blocks for the detectors, which are to be assembled into the jPET-D4 scanner. We also introduce the crystal assembly method, which is simple enough, even though each DOI crystal block is composed of 1,024 crystal elements. The jPET-D4 detector consists of four layers of 16 x 16 Gd(2)SiO(5) (GSO) crystals and a 256-channel flat-panel position-sensitive photomultiplier tube (256ch FP-PMT). To identify scintillated crystals in the four-layer DOI detector, we use pulse shape discrimination and position discrimination on the two-dimensional (2D) position histogram. For pulse shape discrimination, two kinds of GSO crystals that show different scintillation decay time constants are used in the upper two and lower two layers, respectively. Proper reflector arrangement in the crystal block then allows the scintillated crystals to be identified in these two-layer groupings with two 2D position histograms. We produced the 120 DOI crystal blocks for the jPET-D4 system, and measured their characteristics such as the accuracy of pulse shape discrimination, energy resolution, and the pulse height of the full energy peak. The results show a satisfactory and uniform performance of the four-layer DOI crystal blocks; for example, misidentification rate in each GSO layer is <5% based on pulse shape discrimination, the averaged energy resolutions for the central four crystals of the first (farthest from the FP-PMT), second, third, and 4th layers are 15.7 +/- 1.0, 15.8 +/- 0.6, 17.7 +/- 1.2, and 17.3 +/- 1.4%, respectively, and variation in pulse height of the full energy peak among the four layers is <5% on average.

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Simplified simulation of four-layer depth of interaction detector for PET

Haneishi

Sato

Inadama³

et al. 2007

Radiol Phys Technol

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A four-layer depth-of-interaction (DOI) detector was proposed from and developed at the research project at the National Institute of Radiological Sciences in Japan, with the aim of achieving high resolution and high spatial sensitivity. Previously, we had developed a Monte Carlo simulation for a DOI detector with 2 x 2 x 4 crystal elements. In this study, in order to simulate the final version of the DOI detector of the project, which uses a larger number of crystal elements, we have developed a much faster and simpler simulator. In this paper the algorithm of the simplified simulator as well as the previously proposed Monte Carlo method is presented and the validation of the simplified simulator through comparisons with the full Monte Carlo simulation and with some experimental results is described.

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Improvement of the depth of interaction detector for PET on full energy pulse height uniformity

Cited by 11 publications

References 19 publications

Timing resolution improvement using DOI information in a four-layer scintillation detector for TOF-PET

Timing resolution improvement using DOI information in a four-layer scintillation detector for TOF-PET

Performance evaluation for 120 four-layer DOI block detectors of the jPET-D4

Simplified simulation of four-layer depth of interaction detector for PET

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