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ORIGINALRESEARCH ADULT BRAIN Accuracy of the Compressed Sensing Accelerated 3D-FLAIR Sequence for the Detection of MS Plaques at 3T X S.Toledano-Massiah,X A.Sayadi,X R.deBoer,X J.Gelderblom,X R.Mahdjoub,X S.Gerber,X M.Zuber,X M.Zins, andX J.Hodel ABSTRACT BACKGROUNDANDPURPOSE: Theuseof3DFLAIRimprovesthedetectionofbrainlesionsinMSpatients,butrequireslongacquisition times.CompressedsensingreducesacquisitiontimebyusingthesparsityofMRimagestorandomlyundersamplethek-space.Ouraimwas tocomparetheimagequalityanddiagnosticperformanceof3D-FLAIRwithandwithoutcompressedsensingforthedetectionofmultiple sclerosislesionsat3T. MATERIALS AND METHODS: Twenty-three patients with relapsing-remitting MS underwent both conventional 3D-FLAIR and com- pressedsensing3D-FLAIRona3Tscanner(reductioninscantime1minute25seconds,27%;compressedsensingfactorof1.3).Twoblinded readersindependentlyevaluatedbothconventionalandcompressedsensingFLAIRforimagequality(SNRandcontrast-to-noiseratio)and the number of MS lesions visible in the periventricular, intra-juxtacortical, infratentorial, and optic nerve regions. The volume of white matterlesionswasmeasuredwithautomaticpostprocessingsegmentationsoftwareforeachFLAIRsequence. RESULTS: ImagequalityandthenumberofMSlesionsdetectedbythereadersweresimilarbetweenthe2FLAIRacquisitions(P.74andP .094,respectively).AlmostperfectagreementwasfoundbetweenbothFLAIRacquisitionsfortotalMSlesioncount(Linconcordancecorrelation coefficient0.99).AgreementbetweenconventionalandcompressedsensingFLAIRwasalmostperfectforperiventricularandinfratentorial lesionsandsubstantialforintrajuxtacorticalandopticnervelesions.Postprocessingwiththesegmentationsoftwaredidnotrevealasignificant differencebetweenconventionalandcompressedsensingFLAIRintotalMSlesionvolume(P.63)orthenumberofMSlesions(P.15). CONCLUSIONS: Withacompressedsensingfactorof1.3,3D-FLAIRis27%fasterandpreservesdiagnosticperformanceforthedetection ofMSplaquesat3T. ABBREVIATIONS: CNRcontrast-to-noiseratio;CScompressedsensing;MAGNIMSMagneticResonanceImaginginMultipleSclerosis;PIparallelimaging he diagnosis of MS relies on the demonstration of the dissem- 2D-FLAIR, the longer scan time of the 3D version has so far hin- Tination of white matter hyperintensities in space and time dered its adoption. with MR imaging. The FLAIR sequence plays a pivotal role in Compressed sensing (CS) is an acceleration technique newly patients with MS because it shows white matter lesions in specific available in MR imaging clinical routine. It uses the sparsity of MR locations (subtentorial, optic nerve, juxtacortical, periventricu- images to randomly undersample the k-space, thus saving scan 1,3 5-9 lar). In its 3D implementation, FLAIR also improves the detec- time. Contrary to parallel imaging (PI), CS is insensitive to the
American Journal of Neuroradiology – American Journal of Neuroradiology
Published: Mar 1, 2018
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