0000000000794808

AUTHOR

N. Malakhov

showing 2 related works from this author

First coincidences in pre-clinical Compton camera prototype for medical imaging

2003

Abstract Compton collimated imaging may improve the detection of gamma rays emitted by radioisotopes used in single photon emission computed tomography (SPECT). We present a crude prototype consisting of a single 500 μm thick, 256 pad silicon detector with pad size of 1.4×1.4 mm 2 , combined with a 15×15×1 cm 3 NaI scintillator crystal coupled to a set of 20 photo multipliers. Emphasis is placed on the performance of the silicon detector and the associated read-out electronics, which has so far proved to be the most challenging part of the set-up. Results were obtained using the VATAGP3, 128 channel low-noise self-triggering ASIC as the silicon detector's front-end. The noise distribution (…

PhysicsSingle photon emission computed tomography (SPECT)Nuclear and High Energy PhysicsPhotonbusiness.industryPhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical PhenomenaGamma rayCompton scatteringScintillatorCollimated lightFull width at half maximum87.58.Ce; 29.40.GxOpticsSilicon pad detectorsCoincidentTracking and position-sensitive detectorsMedical imaging[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]businessInstrumentationNoise (radio)Compton camera
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Time response of avalanche photodiodes as a function of the internal gain

1998

Abstract Using a red LED and a blue laser as a light source, time response of avalanche photodiodes and Metal-Resistive Silicon (MRS) layer avalanche photodiodes [1] has been measured. A strong dependence of the time resolution on the internal gain has been observed. The obtained results show that the increase of the internal gain improves the time resolution. However, there exists a critical value for the internal gain. Beyond this value a deterioration of the time resolution is observed.

PhysicsNuclear and High Energy PhysicsBlue laserAvalanche diodeSiliconbusiness.industrychemistry.chemical_elementFunction (mathematics)Critical valueAvalanche photodiodeOpticsTime responsechemistrySingle-photon avalanche diodeOptoelectronicsbusinessInstrumentationNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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