Evaluation of a Compton scattering camera using 3-D position sensitive CdZnTe detectors

Du, Yingshuai; He, Zhong; Knoll, G.F.; Wehe, D.K.; Li, W.

doi:10.1016/s0168-9002(00)00669-0

Cited by 115 publications

(62 citation statements)

References 8 publications

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“…Given the 3-D position information provided by the detector, we can identify events from a specific interaction location and with 511 keV full energy deposition. The mean waveform for these events were obtained by averaging over measured waveforms lined up at the same starting time: (2) where T i is the true interaction timing obtained from the BaF 2 coincidence detector. w5 11 keV (t) is the mean waveform resulting from an 511 keV energy deposited at this given location, assuming that the interaction occurred at t = 0.…”

Section: Using Cathode Waveform For Timing Estimationmentioning

confidence: 99%

“…This unique capability is detailed in Refs. [1,2]. Based on this information, we select an appropriate mean waveform and then use the fitting process to find interaction timing.…”

Section: Using Cathode Waveform For Timing Estimationmentioning

confidence: 99%

“…Over the past several years, substantial efforts have been made in developing large volume 3-D position sensitive CZT detectors for detecting gamma-rays and other energetic particles [1,2]. These devices have shown great potential for gamma-ray imaging and spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Exploring the limiting timing resolution for large volume CZT detectors with waveform analysis

Meng

2005

Nuclear Instruments and Methods in Physics Research Section A:

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This paper presents a study for exploring the limiting timing resolution that can be achieved with a large volume 3-D position sensitive CZT detector. The interaction timing information was obtained by fitting the measured cathode waveforms to pre-defined waveform models. We compared the results from using several different waveform models. Timing resolutions, of ~9.5 ns for 511 keV full-energy events and ~11.6 ns for all detected events with energy deposition above 250 keV, were achieved with a detailed modeling of the cathode waveform as a function of interaction location and energy deposition. This detailed modeling also allowed us to derive a theoretical lower bound for the error on estimated interaction timing. Both experimental results and theoretical predications matched well, which indicated that the best timing resolution achievable in the 1 cm 3 CZT detector tested is ~10 ns. It is also showed that the correlation between sampled amplitudes in cathode waveforms is an important limiting factor for the achievable timing resolution.

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Section: Using Cathode Waveform For Timing Estimationmentioning

confidence: 99%

“…This unique capability is detailed in Refs. [1,2]. Based on this information, we select an appropriate mean waveform and then use the fitting process to find interaction timing.…”

Section: Using Cathode Waveform For Timing Estimationmentioning

confidence: 99%

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Exploring the limiting timing resolution for large volume CZT detectors with waveform analysis

Meng

2005

Nuclear Instruments and Methods in Physics Research Section A:

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“…Employing semiconductor imaging spectrometers, with their good resolutions, is hence a promising approach to realize high sensitivity Compton telescopes. From this point of view, Compton telescopes based on Si, Ge ,CZT and CdTe are proposed and development is on-going by many groups [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Recent results from a Si/CdTe semiconductor Compton telescope

Tanaka

Watanabe

Takeda

et al. 2006

Nuclear Instruments and Methods in Physics Research Section A:

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We are developing a Compton telescope based on high resolution Si and CdTe detectors for astrophysical observations in sub-MeV/MeV gamma-ray region. Recently, we constructed a prototype Compton telescope which consists of six layers of double-sided Si strip detectors and CdTe pixel detectors to demonstrate the basic performance of this new technology. By irradiating the detector with gamma-rays from radio isotope sources, we have succeeded in Compton reconstruction of images and spectra. The obtained angular resolution is 3.9 • (FWHM) at 511 keV, and the energy resolution is 14 keV (FWHM) at the same energy. In addition to the conventional Compton reconstruction, i.e., drawing cones in the sky, we also demonstrated a full reconstruction by tracking Compton recoil electrons using the signals detected in successive Si layers. By irradiating 137 Cs source, we successfully obtained an image and a spectrum of 662 keV line emission with this method. As a next step, development of larger double-sided Si strip detectors with a size of 4 cm × 4 cm is underway to improve the effective area of the Compton telescope. We are also developing a new low-noise analog ASIC to handle the increasing number of channels. Initial results from these two new technologies are presented in this paper as well.

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“…An alternative way to image gamma rays without the use of a collimator is Compton imaging [12][13][14][15][16][17][18][19][20][21][22]. This imaging concept relies on the Compton effect and therefore converts the otherwise limiting process of multiple interaction in the detector into a required process.…”

Section: Overview Of Gamma-ray Imaging Conceptsmentioning

confidence: 99%