Impact of the detector parameters on a Compton camera

Conka-Nurdan, T.; Nurdan, K.; Constantinescu, F.; Freisleben, Bernd; Pavel, N.; Walenta, A.H.

doi:10.1109/tns.2002.1039569

Cited by 22 publications

(9 citation statements)

References 12 publications

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“…Most of the Compton scatter cameras proposed [3][4][5][6][7] or built [4,8,9] to date employ at least two layers of position sensitive detectors, one of which acts as a scatterer, in which the g-ray is supposed to release part of its energy in a Compton scattering, and the other as an absorber, in which the down-scattered photon is fully absorbed in a photoelectric effect. The alternative to using a scatterer-absorber Compton camera system is to employ a monolithic position sensitive detector that acts as a scatterer and absorber at the same time [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

SPEIR: A Ge Compton camera

Mihailescu

Vetter

Burks

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Introductionmentioning

confidence: 99%

SPEIR: A Ge Compton camera

Mihailescu

Vetter

Burks

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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“…Compton camera is a detector system, which in principle provides a good position resolution and high sensitivity for imaging radioactive tracers in the 0.2-3 MeV energy region of gamma-rays [1]. This is achieved by replacing the highly inefficient parallel hole collimator of standard Anger Cameras.…”

Section: Introductionmentioning

confidence: 99%

Detective Quantum Efficiency and Deadtime Losses in Compton Imaging Systems

Nurdan

Conka-Nurdan

Walenta

et al. 2006

2006 IEEE Nuclear Science Symposium Conference Record

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The Compton Camera is an imaging system where the vertex and the angle of the scattered gamma ray are reconstructed by measuring in coincidence the Compton electron and the scattered gamma ray. If one of the detectors has a modest time resolution a hardwired coincidence unit will lead to unsatisfying results at elevated rates. Therefore new concept of a software based coincidence system systems has been developed. This allows to record most events and to use additional information to solve possible ambiguities.The key elements are time stamps added to all signals and to process data in a first unit in order to rearrange the signals to good events. Monte Carlo simulations have been carried out in order to assess the effects of detector dead time and dead time introduced by these necessary processing stages. It could be shown that the new data acquisition system behaves as if at high rates it is limited by an equivalent paralysable deadtime, which then translates to a rate dependent detective quantum efficiency (DQE). More detailed studies show that the time duration for the processing of an event in the processor of the system and the event buffer depth are controlling factors. This is important for system design to optimize the DQE for real time high data rate applications.Specifically, Monte-Carlo (MC) simulations are performed for highly efficient thick Si(Li) detectors where event reconstruction is compromised by the long drift times of the order of microseconds. Time stamping and realtime processing of complex event information remedies the drift problem which is demonstrated with the developed concept of DQE and equivalent time coincidence window width.

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“…These devices have been successfully used either as single units and as part of monolithic arrays for gamma detection and the additional capability of reaching a moderately good timing resolution could allow to use them in imaging systems like, for instance, Compton Cameras, as second detector [6].…”

Section: Introductionmentioning

confidence: 99%

Timing properties of silicon drift detectors for scintillation detection

Fiorini

Gola

Longoni

et al. 2004

IEEE Trans. Nucl. Sci.

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In this paper, we have evaluated the timing properties offered by silicon drift detectors to be used as scintillation photodetectors in systems for medical imaging. The peculiar drift mechanism of the charge created inside the SDD volume is responsible for a rise time of the signal at the output of the device when this is irradiated over its whole active area. Despite this effect, the rise time is in the order of 200 ns for a 5 mm2 device, therefore, still comparable with the shaping time used for timing measurements. In this paper, the effect on the timing performances of SDDs due to the drift mechanism is first theoretically evaluated.We have then carried out the experimental characterization of the timing properties of a 5-mm2 SDD coupled to a GSO crystal, in coincidence with a NaI-PMT detector, using a 22 Na source. Despite the low conversion gain of the system (2.5 e-/keV), due to the low light output of the crystal and the nonoptimized quantum efficiency of the SDD, a timing resolution of 22 ns was measured for 511 keV photons. This corresponds to a product resolution times number of collected electrons of about 13 9 103 ns e h which is comparable to the one achieved with APDs of similar areas. By irradiating the SDD directly with laser pulses, a resolution better than 1 ns was achieved with more than 60.000 electrons, showing no relevant limitations due to possible jitters of the drift tim

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Impact of the detector parameters on a Compton camera

Cited by 22 publications

References 12 publications

SPEIR: A Ge Compton camera

SPEIR: A Ge Compton camera

Detective Quantum Efficiency and Deadtime Losses in Compton Imaging Systems

Timing properties of silicon drift detectors for scintillation detection

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