預(yù)處理注意事項(xiàng)3、手動(dòng)reorient之a(chǎn)c-pc線

Anteriorcommissure（AC）:前連合。TheanteriorcommissureistheoriginfortheTalairachcoordinatesystem,ACTalairachSPMac-pc的空間位置關(guān)系。前聯(lián)合用紅色點(diǎn)表示，后聯(lián)合用黃色表示。在Talairach模板的文檔中,AC-PC線從前聯(lián)合AC的表面出發(fā)，延伸到后聯(lián)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的具體做法，源自水滴的提供：http: 斯坦福大學(xué)腦科學(xué)中心ACPC校準(zhǔn)的protocol(非常詳細(xì))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