PET data acquisition (DAQ) system having scalability for the number of detector

Nakazawa, Masayuki; Ohi, Junichi; Furumiya, Tetsuo; Tsuda, Tomoaki; Furuta, Masafumi; Sato, Masanobu; Kitamura, Kazuhiro

doi:10.1109/nssmic.2012.6551564

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…1, scanner consists of adjustable two detector h patient lying on a bed equipped with ano therapy devices such as CT, MR and radiothe detector heads are assumed to be stationary Manuscript Fig. 3 shows a prototype of a dual-head system consists of two detector heads, two C the detector heads and the main body con acquisition system [6] and the power-su prototype scanner has two arced detector hea in diameter and the central angle of each hea Each detector head consists of 18 and 3 det transaxial and axial directions, respectively. T axial FOV are 720 mm in diameter and 15 respectively.…”

Section: Introductionmentioning

confidence: 99%

Development of a dual-head mobile DOI-TOF PET system having multi-modality compatibility

Yamakawa

Kobayashi

Furuta

et al. 2014

2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

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We previously proposed t "FlexiblePET", a dual-head mobile DOI-TOF P scans the patient lying on a bed equip imaging/therapy device. Following the develo prototype with dual-head SiPM-based detectors of-concept for MR compatibility, we are now de prototype with DOI-TOF detectors and acquisition system. Each detector module consis array (2.9 mm × 2.9 mm × 20 mm LGSO in a light guide and a 4 × 4 4-ch SiPM array. The de layer DOI capability by a special reflector ar expected to have < 500 ps coincidence timin scanner has two arced detector heads (central diameter: 778 mm), and each consists of 18 de transaxial direction and 3 rings in axial directio configuration provides 715 mm transaxial FO axial FOV. The detector head arrangement i four types: Top-Bottom, Left-Right, Side depending on imaging purpose. In addition imaging is possible by moving detector heads cl To compensate image quality degradation caus angle coincidence measurement, which is inher head scanning, a new regularized TOF list-mo algorithm that combines weighted maxi estimation and projection-space regulariz developed. In this study, we will report initial r performance evaluations of the prototype Fle according to the NEMA NU 2-2007 standards. results support that the developed dual-head protoptype system has the MR-compatibility a image quality from the incomplete TOF project

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Section: Introductionmentioning

confidence: 99%

Development of a dual-head mobile DOI-TOF PET system having multi-modality compatibility

Yamakawa

Kobayashi

Furuta

et al. 2014

2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

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“…The advantage of the flexible PET would be not only in its multi-modal extensibility to the already-installed devices but also in its device cost due to the reduced number of detectors . We recently developed the MR-compatible depth-of-interaction PET detector [1] and the scalable data acquisition system [2 ] for the flexible PET scanner . However , as Fig .…”

Section: Introductionmentioning

confidence: 99%

Design considerations for a partial-ring, multi-modal compatible whole-body TOF PET scanner: Flexible PET

Kobayashi

Kitamura

2012

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

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Along with the popularization and technological maturation of integrated PET-CT, the center of research interest has moved to integrated PET-MR. In this situation, we are developing a multi-modal compatible flexible PET scanner. In our concepts, the scanner consists of adjustable two detector units and their support apparatus, and then scans a patient lying on a bed equipped by other medical imaging/non-imaging device.Therefore, depending on the size and shape of the patient and the patient bed and other demands, the detector geometry can be changed flexibly. Although, due to the limited angular coverage, distortion-and artifact-free image reconstruction is not feasible without detector rotation, it is known that accurate time-of-flight (TOF) information helps to improve reconstruction quality in such a partial-ring scanner.In this study, we performed whole-body 2-D imaging simulations to investigate detector geometric and TOF requirements for the partial-ring scanner for obtaining comparable image quality to a conventional full-ring non-TOF scanner. In particular, required angular coverage by the detector units in relation with the timing resolution and the influence of the arrangement of the opposed detector units (i.e., missing direction is perpendicular to patient's front-to-back or left-to right direction) to the reconstruction image quality were investigated. The simulation results on the image appearance and contrast-noise performance showed that the partial-ring scanner consisting of the two detector arcs each having the central angle of 150 degree and 400-500 ps timing resolution could provide comparable image quality to the conventional scanner regardless of the arrangement of the opposed detectors. However, in the case of the 130 degree coverage with the 400-500 ps timingresolution, the contrast-noise performance of the partial-ring geometries could not reach partially that of the conventional scanner due to the missed spatial and/or statistical information.In this point, we showed that the use of the object support constraint in the iterative reconstruction could reduce the intensity bias and blurring and then improves the contrast-noise performance.

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“…The most obvious one is the bandwidth of communication links, which has to be large enough to support the transmission of all subevent or coincidence data at the highest levels; if it is not, subevents start to get lost to full queues and the accepted event rate suffers. A number of recent studies on the scalability of PET DAQ architectures [287,348,349,375] focus on this limitation as they identify coincidence management as the bottleneck to DAQ scalability and propose distributed coincidence schemes based on ring topologies and variations thereof as the solution, suggesting that tree topologies are too inefficient in terms of link bandwidth usage.…”

Section: Proposed Architecturementioning

confidence: 99%

“…5.1c): In this situation, data acquisition nodes are connected following a circular ring topology, usually one-directional [347,348]. Announcements of newly detected subevents are transmitted along the ring from one node to the next, where temporal coincidence with local subevents may be checked, until reaching the source node (or the one behind it) where they can be dropped.…”

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confidence: 99%

Development of a data acquisition architecture with distributed synchronization for a Positron Emission Tomography system with integrated front-end.

Varea¹,

Ramón²

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Positron Emission Tomography (PET) is a non-invasive nuclear medical imaging modality that makes it possible to observe the distribution of metabolic substances within a patient's body after marking them with radioactive isotopes and arranging an annular scanner around him in order to detect their decays. The main applications of this technique are the detection and tracing of tumors in cancer patients and metabolic studies with small animals.The Electronic Design for Nuclear Applications (EDNA) research group within the Instituto de Instrumentación para Imagen Molecular (I3M) has been involved in the study of high performance PET systems and maintains a small experimental setup with two detector modules. This thesis is framed within the necessity of developing a new data acquisition system (DAQ) for the aforementioned setup that corrects the drawbacks of the existing one. The main objective is to define a DAQ architecture that is completely scalable, modular, and guarantees the mobility and the possibility of reusing its components, so that it admits any extension of modification of the setup and it is possible to export it directly to the configurations used by other groups or experiments. At the same time, this architecture should be compatible with the best possible resolutions attainable at the present instead of imposing artificial limits on system performance. In particular, the new DAQ system should outperform the previous one.As a first step, a general study of DAQ architectures is carried out in the context of experimental setups for PET and other high energy physics applications. On one hand, the conclusion is reached that the desired specifications require early digitization of detector signals, exclusively digital communication between modules, and the absence of a centralized trigger. On the other hand, the necessity of a very precise distributed synchronization scheme between modules becomes apparent, with errors in the order of 100 ps, and operating directly over the data links. A study of the existing methods reveals their severe limitations in terms of achievable precision. A theoretical analysis of the situation is carried out with the goal of overcoming them, and a new synchronization algorithm is proposed that is able to reach the desired resolution while getting rid of the restrictions on clock iii alignment that are imposed by virtually all usual schemes. Since the measurement of clock phase difference plays a crucial role in the proposed algorithm, extensions to the existing methods are defined and analyzed that improve them significantly. The proposed scheme for synchronism is validated using commercial evaluation boards.Taking the proposed synchronization method as a starting point, a DAQ architecture for PET is defined that is composed of two types of module (acquisition and concentration) whose replication makes it possible to arrange a hierarchic system of arbitrary size, and circuit boards are designed and commissioned that implement a realization of the architecture for the...

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PET data acquisition (DAQ) system having scalability for the number of detector

Cited by 9 publications

References 4 publications

Development of a dual-head mobile DOI-TOF PET system having multi-modality compatibility

Development of a dual-head mobile DOI-TOF PET system having multi-modality compatibility

Design considerations for a partial-ring, multi-modal compatible whole-body TOF PET scanner: Flexible PET

Development of a data acquisition architecture with distributed synchronization for a Positron Emission Tomography system with integrated front-end.

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