磁共振成像數(shù)據(jù)采集與圖像重建算法研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文磁共振成像數(shù)據(jù)采集與圖像重建算法研究姓名：詹應(yīng)鍵申請學(xué)位級別：碩士專業(yè)：生物醫(yī)學(xué)工程指導(dǎo)教師：林家瑞20050508AbstractMagicresonanceimaging(MRI)whichisbasedontheprinciplesofnuclearmagicresonance(NMR)isanimagingtechniqueusedprimarilyinmedicalsettingstoproducehi

2、ghqualityimagesoftheinsideofthehumanbody.Itisoneofthenoninvasiondiagnosticmethodsapowerfultoolfmedicalmolecularbiologyresearch.Itisoftenpossibletodiagnosediseaseatveryearlystagewithoutanyharmfulradiationbefeitisvisibleby

3、othermeans.Itisimptanttodevelopnewkspacetrajectiescrespondingimagereconstructionalgithmsfhigherimagingspeed.InthisthesiswecomparedthreekindsofgriddingreconstructionalgithmsdevelopedaMRIreconstructionsoftware.Wediscussedt

4、heconvolutiongriddingalgithmmatrixinversiongriddingalgithmnextneighbgriddingalgithm.Nextneighbalgithmismodifiedtospeedupimaging.Abovealgithmsareappliedtonumericalmodelsphantomsinvivoexperimentsonhumanbodieswiththeconclus

5、ion:(1)Nextneighbalgithmistimeefficientwithacceptableimagequality.Itdoesnotrequirespecialgradientsystemcanbeeasilyappliedincurrentsystems.(2)Modifiednextneighbalgithmruns3timesfasterthantheiginalonewithparallelstructurew

6、hichcanbeimplementedonaparallelsystemfrealtimeimaging.AMRIreconstrucitionsoftwareisdevelopedwhichcanreadinrawdatadisplaythetrajectycompensatenonunifmsamplingdensityreconstructimagedisplaytheresult.Itisusefultonewtrajecty