A Method of Improving Photon Detection Efficiency of High Purity Germanium Cameras by including Double-Interaction Photopeak Events

Bieszk, John A.; Lim, C. B.; Hawman, Eric G.

doi:10.1109/tns.1983.4332338

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Since the single-and pair-photon events have different information content, the numerical results are given separately. Comparisons on these factors between the multiple detector imaging system and CUStomary PET are carried out assuming that the thin detector is made by HpGe [2,4,17] and both the thick detector and customary PET are made by BGO [12,18].…”

Section: Fig3mentioning

confidence: 99%

“…SlCflight loss) = '11 ( c da ) (0.187857) (17) where flight loss referres to the case in which one photon flies out the detector range and '71 = PAO Pcp fs = 9.5% fs is the single-photon detector efficiency of a stack. For the case in which one photon is attenuated within the water phantom, ~2(attenuation loss) = v i ( c da ) ( 0.189609), (18) and in the case where one photon penetrates through a detector stack or is scattered in the thick detector,…”

Section: (7)mentioning

confidence: 99%

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Analytical study of a three dimensional imaging system using both single and coincident pair photons (tomography)

Zhang

Proceedings. IEEE Energy and Information Technologies in the Southeast'

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Analytical study of a three dimensional positron emission imaging system using both coincident pair-photon and non-coincident single-photon events is presented. Utilization of the non-coincident single-photon events of 511 kev to supplement the coincident pair-photon measurements for three dimensional image reconstruction is described. Detector efficiency and resolution of this imaging system are calculated. Computer simulation and calculation on sensitivity, signal to noise ratio, noise background, and contrast are carried out for a cylindrical water phantom. Comparisons of these four factors between this imaging system and customary positron emission imaging system are given INTRODUCTIONPositron emission tomography (PET) and single photon emission computed tomography (SPECT) have been developed extensively but separately. SPECT image is reconstructed from single-photon projection rays collimated by lead collimator holes, while PET image is reconstructed from 511 kev pair-photon projection rays collimated by coincident measurements. The potential information contained in non-coincident 511 kev photon events not scattering about

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Section: Fig3mentioning

confidence: 99%

Section: (7)mentioning

confidence: 99%

Analytical study of a three dimensional imaging system using both single and coincident pair photons (tomography)

Zhang

Proceedings. IEEE Energy and Information Technologies in the Southeast'

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Gamma-camera systems

Short¹

1984

Nuclear Instruments and Methods in Physics Research

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Comparisons of multiple photon coincidence imaging techniques

Zhang

Jaszczak

1990

IEEE Trans. Nucl. Sci.

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We compare analytically techniques for multiplephoton coincidence imaging in terms of spatial resolution, detector efficiency (or simply efficiency), and system sensitivity for a spherical water phantom (or simply sensitivity). One analysis consists of comparing photon-photon coincidence single-photon-emission computerized tomography (PP-SPECT) with angularly unconstrained, electronically collimated triple-photon coincidence imaging technique (TPCIT). A second analysis compares positron-emission tomography using time-of-flight information (TOF-PET) with angularly constrained, electronically collimated TPCIT. The angularly unconstrained TPCIT has similar spatial resolution, higher efficiency, and higher sensitivity, as compared with PP-SPECT. The angularly constrained TPCIT has similar spatial resolution, lower efficiency, and lower sensitivity, as compared with TOF-PET. However, the angularly constrained TPCIT can, for brain imaging, reduce the localization range of photon-emission sites along projection rays from about 20 ci~z to about 1 cin during data acquisition while TOF-PET currently reduces the range to about 7 cin.

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A Method of Improving Photon Detection Efficiency of High Purity Germanium Cameras by including Double-Interaction Photopeak Events

Cited by 4 publications

References 7 publications

Analytical study of a three dimensional imaging system using both single and coincident pair photons (tomography)

Analytical study of a three dimensional imaging system using both single and coincident pair photons (tomography)

Gamma-camera systems

Comparisons of multiple photon coincidence imaging techniques

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