预处理注意事项3、手动reorient之ac-pc线

Anteriorcommissure（AC）:前连合。TheanteriorcommissureistheoriginfortheTalairachcoordinatesystem,ACTalairachSPMac-pc的空间位置关系。前联合用红色点表示，后联合用黄色表示。在Talairach模板的文档中,AC-PC线从前联合AC的表面出发，延伸到后联合PC的。如MNIJ.TalairachandP.Tournoux,"Co-narStereotaxicAtlasoftheHumanBrain:3-DimensionalProportionalSystem-anApproachtoCerebralImaging",ThiemePublishers,NewYork,NY,MNIX第三幅：axialview)，MNIZ手工校正ACPC的具体做法，源自水滴的提供：http: 斯坦福大学脑科学中心ACPC校准的protocol(非常详细)AC/PCalignmentinOpenTypeSPMfmriatcommand DisyoptionontheSPM-->FileSelectorPromptwindowappears.SelecttheimagetobeACPCalignedandclickDone-->GraphicswindowappearswiththeselectedPleasechecktheorientationoftheselectedimage.Iftheimagesareinthecorrectorientation,then-->Top-leftimageshouldbecoronalwiththe top(superior)oftheheaddisyedatthetopandleftsideoftheheadshownontheleft.Thisisasifthesubjectisviewedfrom-->Bottom-LeftimageshouldbeAxialwiththe front(anterior)oftheheadatthetopandtheleftoftheheadshownontheleft.Thisisasifthesubjectisfrom-->Top-rightimageshouldbesagittalwiththe front(anterior)oftheheadattheleftandthetopoftheheadshownatthetop.ThisisasifthesubjectisfromtheIfthegeneralorientationoftheselectedimageiscorrect(asdescribedproceedwiththefollowingroll{rad}-->Adjustrollvaluesothattheverticallineofthecrosshairroughlythroughthemidlineofthebraininthecoronal rotatestheimageaboutthey-yaw{rad}-->Adjustyawsothattheverticallineofthecrosshairpassthroughthemidlineofthebrainintheaxialview.Yawadjustmentrotatesimageaboutthez-Onceyouarehappywiththerollandyawadjustment,findthebestsliceinthesagittalviewandmovecrosshairinthatslicefromanteriortoandlookforAnteriorcommissure(AC)inthecoronalview.Inthecoronalview,ACshouldbetheclearest,longestandthickestbundleofnervefibers(withoutbreak)andnormallyhasa'mustache'shapeOnceACisidentifiedinthecoronalview,cethecrosshairatthesuperioralongthemidlineoftheAC.(IfACisproperlymarked,inthesagittalview,crosshairwouldbearoundasmallspotofwhitematteratthebottomlevelofcorpuscallosum,belowfornix)pitch{rad}-->AdjustpitchvaluesothatthehorizontallinethatpassesthroughACalsopassesthroughPosteriorCommissure(PC).Pitchadjustmentrotatestheimageaboutthex-axis(PCwillbeatthetopofthecerebralinthesagittalOncewearehappywiththepitchadjustmentandifthecrosshairisstillonthensettheorigin(mmcoordinate0,0,0)oftheimagebypluggingtheinversemm:(LookatthebottomleftoftheGraphicswindowbelowCrosshairposition)right,forward&(e.g:ifthemmco-ordinates:[1- 2]thensetright{mm}=-1,=up{mm}=-PleaseIfthecrosshairisnotonAC,pleasecethecrosshairbackonACbeforeadjustingthemmco-ordinates.Now Reorientimages--->FileSelectorPromptwindow--->SelectthesameimageforwhichthereorientationparameterswherePleaseForstructuralimage,thefileselectedinstep1shouldbereselectedduringForfunctionalscans,selectoneofthefunctionalvolumesinStep1(e.g.10thI-file)andadjustalltheparameters(pitch,yaw,roll,mmco-ord