CAJ | 학술논문

为了获得PET探测器设计中闪烁晶体表面不同处理方式对探测效率的影响,使用DETECT2000对光子在LYSO（Lu1.9Y0.1SiO5∶Ce,硅酸镥）晶体中的光学输运特性进行了蒙特卡罗模拟.探测器由一个4 mm×4 mm×25 mm的LYSO晶体与一个PMT耦合组成.模拟结果显示：入射面为粗糙面（漫反射面）,其余均为抛光面并在外层（入射面和与PMT耦合的面除外）包有反射介质。反射介质的反射率越高,则探测效率越高,并且其探测效率是晶体所有表面作抛光处理方式的1.6倍.在探测器设计过程中,需要选取反射率大于0.98的反射介质作为反射层.
위료획득PET탐측기설계중섬삭정체표면불동처리방식대탐측효솔적영향,사용DETECT2000대광자재LYSO（Lu1.9Y0.1SiO5∶Ce,규산노）정체중적광학수운특성진행료몽특잡라모의.탐측기유일개4 mm×4 mm×25 mm적LYSO정체여일개PMT우합조성.모의결과현시：입사면위조조면（만반사면）,기여균위포광면병재외층（입사면화여PMT우합적면제외）포유반사개질。반사개질적반사솔월고,칙탐측효솔월고,병차기탐측효솔시정체소유표면작포광처리방식적1.6배.재탐측기설계과정중,수요선취반사솔대우0.98적반사개질작위반사층.
In order to find out the detector efficiency of the scintillation crystal over defined the different surface in PET detector system design,the DETECT 2000 Monte Carlo simulation program is used to simulate the optical transport in LYSO scintillation crystals.A detector system using 4 mm×4 mm×25 mm LYSO crystals coupled to a photomultiplier（PMT）.The results given by this software demonstrate that the maximum light output（detector efficiency） can be obtained when its incident surface is a ground surface,the other surfaces are polished surfaces and all its surfaces（except the surface couple with the PMT） are coated with high reflection coefficient（more than 0.98） reflecting material,the detector efficiency about 1.6 times than the all surfaces are polished surfaces.