Performance tests of large area position-sensitive planar germanium detectors with conventional and amorphous contacts

Gros, S.; Hammond, N. J.; Lister, C. J.; Chowdhury, P.; Fischer, Susan M.; Freeman, S. J.

doi:10.1016/j.nima.2008.12.194

Cited by 8 publications

(6 citation statements)

References 33 publications

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“…Previous studies have shown that HPGe detectors can have energy resolution below 1% at 122 keV (Gros et al , 2009). To investigate our specific detector's capabilities, we acquired flood data over the entire detector using four different isotopes in the same acquisition.…”

Section: Methodsmentioning

confidence: 99%

“…The exception to this is the Liverpool group, who have focused on applications for PET or Compton imaging (Cooper et al , 2007). While one group has published results of germanium strip detector performance (Gros et al , 2009), their testing focused on characterizing the degree of charge sharing between strips, charge loss, and the influence of detector design on these problems. This paper instead focuses on characterizing detector properties that are relevant to small-animal SPECT imaging: energy resolution, detection efficiency at relevant energies, intrinsic spatial resolution, depth-of-interaction estimation capabilities, scatter rejection, and uniformity.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a high-purity germanium detector for small-animal SPECT

Johnson

Campbell

Hull³

et al. 2011

Phys. Med. Biol.

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We present an initial evaluation of a mechanically-cooled, high-purity germanium double-sided strip detector as a potential gamma camera for small-animal SPECT. It is 90 mm in diameter and 10 mm thick with two sets of 16 orthogonal strips that have a 4.5 mm width with a 5 mm pitch. We found an energy resolution of 0.96% at 140 keV, an intrinsic efficiency of 43.3% at 122 keV and a FWHM spatial resolution of approximately 1.5 mm. We demonstrated depth-of-interaction estimation capability through comparison of pinhole acquisitions with a point source on and off axis. Finally, a flood-corrected-flood image exhibited a strip-level uniformity of less than 1%. This high-purity germanium offers many desirable properties for small-animal SPECT.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of a high-purity germanium detector for small-animal SPECT

Johnson

Campbell

Hull³

et al. 2011

Phys. Med. Biol.

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“…To our knowledge no groups have recently investigated using HPGe for biomedical applications, with the exception of the Liverpool group, who have focused on PET and Compton imaging [5]. While another group investigated the performance of several different types of germanium strip detectors, their testing focused on characterizing the degree of charge sharing between strips, charge loss and the influence of detector design on these problems [6].…”

Section: Introductionmentioning

confidence: 99%

Performance characterization of a high-purity germanium detector for small-animal SPECT

Johnson

Campbell

Ovchinnikov

et al. 2011

2011 IEEE Nuclear Science Symposium Conference Record

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We present an initial evaluation of a mechanically cooled, high-purity germanium double-sided strip detector as a potential gamma camera for small-animal SPECT. It is 90 mm in diameter and 10 mm thick with two sets of 16 orthogonal strips that have a 4.75 mm width with a 5 mm pitch. A sub-strip interpolation method is used to bin the data at a pixel size of 0.53mm x 0.53mm, while it is also possible to estimate the depth of interaction based on CFD time differences between the anode and cathode. The system has an energy resolution of 0.92% at 140 keY and an intrinsic efficiency of 55.40% at 122 keY.Simulations suggest that increases in the efficiency should be possible by altering signal processing to include Compton events in which charge is collected on more than one strip. Integral uniformity in the central field of view for strips was found to be less than 1 % in a flood-corrected flood while pixel-level uniformity was 2.98%. Due to the excellent energy resolution, the presence of a scattering medium did not greatly alter the FWHM or FWTM of a pinhole projection when compared to an acquisition without a scattering medium. This high-purity germanium system offers many desirable properties for small animal SPECT.

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“…o2.5 keV FWHM) at a peaking time of 1 μs, while also incurring minimal resolution loss at sub-microsecond peaking times, a configuration employing at most 5 mm wide strips separated by at least 3 mm wide gaps would be required. A well documented characteristic of HPGe strip detectors is that of incomplete charge collection resulting from events in which charge is collected to the detector surface in the inter-electrode gap region [14][15][16][17][18]. A standard strip configuration featuring inter strip gaps this wide would be likely to suffer from such high levels of charge loss as to make the design infeasible from a practical standpoint.…”

Section: Theoretical Methodsmentioning

confidence: 99%

A prototype High Purity Germanium detector for high resolution gamma-ray spectroscopy at high count rates

Cooper

Amman

Luke

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tWhere energy resolution is paramount, High Purity Germanium (HPGe) detectors continue to provide the optimum solution for gamma-ray detection and spectroscopy. Conventional large-volume HPGe detectors are typically limited to count rates on the order of ten thousand counts per second, however, limiting their effectiveness for high count rate applications. To address this limitation, we have developed a novel prototype HPGe detector designed to be capable of achieving fine energy resolution and high event throughput at count rates in excess of one million counts per second. We report here on the concept, design, and initial performance of the first prototype device.

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Performance tests of large area position-sensitive planar germanium detectors with conventional and amorphous contacts

Cited by 8 publications

References 33 publications

Characterization of a high-purity germanium detector for small-animal SPECT

Characterization of a high-purity germanium detector for small-animal SPECT

Performance characterization of a high-purity germanium detector for small-animal SPECT

A prototype High Purity Germanium detector for high resolution gamma-ray spectroscopy at high count rates

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