An enhanced high-resolution EMCCD-based gamma camera using SiPM side detection
| Autor: | Jan W T Heemskerk, Marc A N Korevaar, Marlies C Goorden, R. Kreuger, Dennis R. Schaart, J. Huizenga, Freek J Beekman |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Silicon
Photon Physics::Instrumentation and Detectors Photodetector Physics::Optics Electrons Single-photon emission computed tomography medical physics law.invention Iodine Radioisotopes Optics Silicon photomultiplier law medicine Radiology Nuclear Medicine and imaging Gamma Cameras Gamma camera Physics Scintillation Photons Radiological and Ultrasound Technology medicine.diagnostic_test business.industry Detector Organotechnetium Compounds Scintillation counter Scintillation Counting business |
| Zdroj: | Physics in Medicine and Biology, 55 (22), 2010 |
| ISSN: | 0031-9155 |
| Popis: | Electron-multiplying charge-coupled devices (EMCCDs) coupled to scintillation crystals can be used for high-resolution imaging of gamma rays in scintillation counting mode. However, the detection of false events as a result of EMCCD noise deteriorates the spatial and energy resolution of these gamma cameras and creates a detrimental background in the reconstructed image. In order to improve the performance of an EMCCD-based gamma camera with a monolithic scintillation crystal, arrays of silicon photon-multipliers (SiPMs) can be mounted on the sides of the crystal to detect escaping scintillation photons, which are otherwise neglected. This will provide a priori knowledge about the correct number and energies of gamma interactions that are to be detected in each CCD frame. This information can be used as an additional detection criterion, e.g. for the rejection of otherwise falsely detected events. The method was tested using a gamma camera based on a back-illuminated EMCCD, coupled to a 3 mm thick continuous CsI:Tl crystal. Twelve SiPMs have been mounted on the sides of the CsI:Tl crystal. When the information of the SiPMs is used to select scintillation events in the EMCCD image, the background level for (99m)Tc is reduced by a factor of 2. Furthermore, the SiPMs enable detection of (125)I scintillations. A hybrid SiPM-/EMCCD-based gamma camera thus offers great potential for applications such as in vivo imaging of gamma emitters. |
| Databáze: | OpenAIRE |
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