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Design feasibility of gamma camera without collimator based on specific arrangement of the detectors

Nuclear Science and Techniques 2016年第4期27卷 120-126页

作者： Hossein Akbari-Lalimi seyed ali shafiei Geriatric Care Research Center Rafsanjan University of Medical Sciences Department of Medical Physics Mashhad University of Medical Sciences Department of Physiology and Pharmacology School of Medicine Qom University of Medical Sciences

In gamma camera and single-photon emission computerized tomography, the collimator removes most photons. Here, a gamma camera without collimator utilizes a specific arrangement of detectors. Instead of bending beams(like a lens) or directing beams(by parallel hole collimator), changes are created in detectors' field of view(FOV), so that each detector's FOV looks different from others. Simulation proved this theory, with 98 detectors(2 cm 9 1.41 cm) arranged in a zigzag manner for Monte Carlo simulation. A radioactive source with energy of140 ke V was situated on the detectors' faces. Sixty projections, each 3(0 –179) apart, were simulated by Monte Carlo N-Particle(MCNP) 4C code, rotating detectors around a radioactive point. The band containing the radioactive source is clearly visible in each *** obtained after simulation in different projections were reconstructed, and point source location emerged correctly. Simulation of gamma camera with zigzag arrangement of detectors and MCNP-4C code demonstrated that one could string the space and determine radioactive source by image reconstruction without using collimators, solely through these special detectors' distribution.

关键词：探测器准直器 γ相机蒙特卡洛模拟计算机断层扫描单光子发射设计布置

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An Experimental and Numerical Thermal Flow Analysis in a Solar Air Collector with Different Delta Wing Height Ratios

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Frontiers in Heat and Mass Transfer 2024年第2期22卷 491-509页

作者： Ghobad shafiei Sabet ali Sari Ahmad Fakhari Nasrin Afsarimanesh Dominic Organ seyed Mehran Hoseini Department of Mechanical Engineering Shahrood Branch lslamic Azad UniversityShahroodIran Airflow Sciences Corporation LivoniaMIUSA School of Civil and Mechanical Engineering Curtin UniversityBentleyAustralia Department of English as an Additional Language(EAL) Heriot-Watt UniversityGalashielsScotland

This study conducts both numerical and empirical assessments of thermal transfer and fluid flow characteristics in a Solar Air Collector(SAC)using a Delta Wing Vortex Generator(DWVG),and the effects of different height ratios(Rh=0.6,0.8,1,1.2 and 1.4)in delta wing vortex generators,which were not considered in the earlier studies,are *** and exergy analyses are performed to gain maximum *** Reynolds number based on the outlet velocity and hydraulic diameter falls between 4400 and 22000,corresponding to the volume flow rate of 5.21–26.07 m^(3)/*** is observed that the delta wing vortex generators with a higher height ratio yield maximum heat transfer enhancement and overall enhancement *** empirical and numerical findings demonstrate that the exergy and thermal efficiencies decline in a specific *** number,pressure drop,energy,and exergy efficiencies enhance with rising Reynolds number,although the friction coefficient *** maximum heat transfer enhancement is 57%.According to the evaluation of exergy efficiency,the greatest efficiency of 31.2%is obtained at Rh=1.4 and Reynolds number 22000.

关键词： Vortex generators heat transfer augmentation numerical simulation solar air collector empirical height ratio

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