Multitracing Capability of Double-Scattering Compton Imager With NaI(Tl) Scintillator Absorber

Seo, Hee; Kim, Chan Hyeong; Park, Jin Hyung; Kim, Jong Kyung; Lee, Ju Hahn; Lee, Chun Sik; Kim, Soo Mee; Lee, Jae Sung

doi:10.1109/tns.2009.2035806

Cited by 10 publications

(8 citation statements)

References 16 publications

(17 reference statements)

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“…Our research group has developed, as a simple solution to this problem, a prototype double-scattering Compton camera consisting of two double-sided silicon strip detectors (DSSDs) as scatter detectors and a cylindrical NaI(Tl) scintillation detector as the absorber detector. This type Compton camera is suitable for either nuclear decommissioning applications or particle therapy applications, both of which involve imaging of high-energy gamma-ray sources [4,5]. The basic idea of the double-scattering Compton camera is the maximization of imaging resolution by very accurate measurement of two successive Compton-scattering interaction positions using two thin, high-spatial-resolution scatter detectors followed by measurement of the remaining energy of the double-scattered gamma-ray using an absorber detector.…”

Section: Contentsmentioning

confidence: 99%

Monte Carlo simulations on performance of double-scattering Compton camera

et al. 2012

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A double-scattering Compton camera that can effectively obtain three-dimensional emission images in high-energy gamma-ray applications such as nuclear decommissioning and particle therapy monitoring has been developed. The double-scattering Compton camera utilizes two position-sensitive detectors as scatter detectors to determine the trajectory of a scattered gammaray, and a scintillation detector as absorber detector to measure the remaining energy of the doublescattered gamma-ray. The benefit of using two scatter detectors is the accurate determination of the gamma-ray trajectory after the scattering at the first scatter detector, which makes possible higher imaging resolution. In the present study, Geant4 Monte Carlo simulations were conducted to compare the performance of the double-scattering Compton camera with that of a similarly dimensioned single-scattering Compton camera for different source energies. Further, the optimal geometry of the multiple-detector-type double-scattering Compton camera was investigated for the purposes of increasing its imaging sensitivity. The results showed that the double-scattering Compton camera offers superior angular resolution over the entire energy range considered in the present study, whereas the single-scattering Compton camera provides greater sensitivity. The results also showed that, in general, the placement of additional detectors in the axial direction (i.e., stacking) is more effective for sensitivity improvement than doing so in the planar direction. This axial placement, however, lowers the imaging resolution. The double-scattering Compton camera exhibited the highest sensitivity when the additional scatter detectors were added to the first scatter detector

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Section: Contentsmentioning

confidence: 99%

Monte Carlo simulations on performance of double-scattering Compton camera

et al. 2012

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“…The Compton camera considered in the present study, a double-scattering type and recently developed as a prototype system, consists of three gamma-ray detectors: two double-sided silicon strip detectors (DSSDs) as scatterer detectors and one NaI(Tl) scintillation detector as an absorber detector [6,7]. Provided that the deposited energies in the component detectors and the tracks of the scattered photons can be accurately determined, the gamma-ray source can be three-dimensionally localized from three or more conical surfaces.…”

Section: Simulation Geometriesmentioning

confidence: 99%

Feasibility study on Compton imaging for visualization of flow patterns using radiotracers

Seo¹,

Park²,

Park³

et al. 2011

J. Inst.

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The radiotracer technique could be used in studies on multiphase flow systems by three-dimensional visualization of flow patterns, and, relatedly, there have been attempts to develop an industrial-purpose single photon emission computed tomography (SPECT) system. Compton cameras also have a great potential for industrial applications, due specifically to their inherent three-dimensional imaging capability, multi-tracing capability, and higher imaging sensitivity than imaging devices based on mechanical collimation. In the present study, the feasibility of Compton imaging for visualization of detailed flow patterns was determined using a Geant4 Monte Carlo simulation toolkit. The Compton camera considered is a double-scattering type consisting of three gamma-ray detectors: two double-sided silicon strip detectors (DSSDs) as scatterer detectors and one NaI(Tl) scintillation detector as an absorber detector. The results showed that the three-dimensional source distributions can be determined with the Compton camera under various source conditions, including a point source at the center, and two cylinderial volume sources of different dimensions or energies.

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“…The appropriate detector type for Compton imaging is a semi-conductor with a good energy resolution [11][12][13][14]. Furthermore, multi-radiotracer imaging can be a good application of the Compton camera [15][16][17][18]. Without knowledge of the emission energies involved in the measurement, it is necessary to build the Compton camera with more than three detector layers.…”

Section: Introductionmentioning

confidence: 99%

FPGA-Based Interface of Digital DAQ System for Double-Scattering Compton Camera

Kim

2018

Nucl Med Mol Imaging

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Purpose The double-scattering Compton camera (DSCC) is a radiation imaging system that can provide both unknown source energy spectra and 3D spatial source distributions. The energies and detection locations measured in coincidence with three CdZnTe (CZT) detectors contribute to reconstructing emission energies and a spatial image based on conical surface integrals. In this study, we developed a digital data acquisition (DAQ) board to support our research into coincidence detection in the DSCC. Methods The main components of the digital DAQ board were 12 ADCs and one field programmable gate array (FPGA). The ADCs digitized the analog 96-channel CZT signals at a sampling rate of 50 MHz and transferred the serialized ADC samples and the bit and frame clocks to the FPGA. In order to correctly capture the ADC sample bits in the FPGA, we conducted individual sync calibrations for all the ADC channels to align the bit and frame clocks to the right positions of the ADC sample bits. The FPGA logic design was composed of IDELAY and IDDR components, six shift registers, and bit slip buffer resources. Results Using a Deskew test pattern, the delay value of the IDELAY component was determined to align the bit clock to the center of each sample bit. We determined the bit slip in the 12-bit ADC sample using an MSB test pattern by checking where the MSB value of one is located in the captured parallel data. Conclusions After sync calibration, we tested the interface between the ADCs and the FPGA with a synthetic analog Gaussian signal. The 96 ADC channels yielded a mean R 2 goodness-of-fit value of 0.95 between the Gaussian curve and the captured 12bit parallel data.Keywords Double-scattering Compton camera (DSCC) . Prompt gamma imaging . FPGA-based digital DAQ system . Sync calibration of interface between ADC and FPGA

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Multitracing Capability of Double-Scattering Compton Imager With NaI(Tl) Scintillator Absorber

Cited by 10 publications

References 16 publications

Monte Carlo simulations on performance of double-scattering Compton camera

Monte Carlo simulations on performance of double-scattering Compton camera

Feasibility study on Compton imaging for visualization of flow patterns using radiotracers

FPGA-Based Interface of Digital DAQ System for Double-Scattering Compton Camera

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