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1、Seediscussions,stats,andauthorprofilesforthispublicationat:https://www.researchgate.net/publication/265631778SimulationcalculationofphantomprojectionsbasedonphysicsmodelofmedicalX-rayimagingArticleinHsi-AnChiaoTungTaHsueh/JournalofXi'anJiaotongUniversity·August2006CITATIONSREADS42573authors:ShaojieT
2、angXuanqinMouXi'anUniversityofPostsandTelecommunicationsXi'anJiaotongUniversity81PUBLICATIONS276CITATIONS209PUBLICATIONS4,340CITATIONSSEEPROFILESEEPROFILEHaoYanCyberMedicalCorporation73PUBLICATIONS455CITATIONSSEEPROFILESomeoftheauthorsofthispublicationarealsoworkingontheserelatedprojects:MedicalImag
3、eAnalysiswithCardiacSPECT,VascularMRI,andsoon.ViewprojectAllcontentfollowingthispagewasuploadedbyShaojieTangon18September2014.Theuserhasrequestedenhancementofthedownloadedfile.第40卷第8期西安交通大学学报Vol.40№82006年8月JOURNALOFXI′ANJIAOTONGUNIVERSITYAug.2006基于医学X射线成像物理模型的模体投影仿真计算汤少杰,牟轩沁,闫浩(西安交通大学图像处理与模式识别研究所,71
4、0049,西安)摘要:为了逼真模拟X射线CT投影数据,提出一种结合X射线能谱分布函数和组织边界逼近策略的投影仿真算法.该算法将模体内各区域CT值映射为组织密度和各元素质量分数,用XCOM软件计算组织质量衰减系数,确定X射线穿越各区域边界的位置,最后根据X射线能谱参数、组织密度、组织质量衰减系数、相邻边界间的距离计算出经过衰减的X射线能谱分布函数与模体投影数据.该算法比解析模拟算法编程简单,比离散模拟算法存储空间小、计算精度高.对模拟投影进行Feldkamp锥形束三维重建,显示出预期的射束硬化效果.关键词:模体投影;投影仿真;能谱分布;锥形束;三维重建中图分类号:TP39114文献标识码:A文章
5、编号:0253O987X(2006)08O0901O05SimulationCalculationofPhantomProjectionsBasedonPhysicsModelofMedicalX2RayImagingTangShaojie,MouXuanqin,YanHao(InstituteofImageProcessingandPatternRecognition,Xi′anJiaotongUniversity,Xi′an710049,China)Abstract:InordertorealisticallysimulatetheprojectionsofX2raycomputedtom
6、ography(XCT),aprojectionsimulationalgorithmispresentedbycombiningtheX2rayenergyspectrumdistributionfunctionwiththetissueboundaryapproximationstrategy.Firstly,thegeometricalshapesandCTnumbersofallsub2regionsofaphantomaredetermined.Next,mappingtheseCTnumbersontocorrespondingtissuedensitiesandelemental
7、massfraction,thetissuemassattenua2tioncoefficientsarecalculatedbyXCOMsoftware.Finally,theX2rayenergyspectrumdistribu2tionfunctionandprojectionsthathavebeenattenuatedarecomputedaccordingtotheX2rayener2
