title: Utility of an ultrafast magnetic resonance imaging protocol in recent and semi-recent strokes.
abstract: OBJECTIVE
  To evaluate the technical feasibility of an integrated ultrafast head magnetic resonance (MR) protocol using a sensitivity encoding (SENSE) technique for depicting parenchymal ischaemia and vascular compromise in patients with suspected recent stroke.
  
  
  METHODS
  23 patients were evaluated with the ultrafast MR protocol using T2, T1, fluid attenuated inversion recovery (FLAIR), 3D time of flight magnetic resonance angiography (MRA), and diffusion weighted imaging (DWI) sequences. These were compared with routine conventional MR sequences.
  
  
  RESULTS
  One patient could not tolerate conventional imaging, although imaging using the three minute head SENSE protocol was diagnostic. Both conventional and ultrafast protocols were of similar diagnostic yield in the remaining patients. There were no significant differences in clinical diagnostic quality for the T1, T2, FLAIR, and DWI sequences. One MRA examination was of better quality when SENSE was used, owing to reduced motion artefacts and shorter imaging time.
  
  
  CONCLUSIONS
  It is possible to undertake a comprehensive MR examination in stroke patients in approximately three to five minutes. Ultrafast imaging may become a useful triage tool before thrombolytic therapy. It may be of particular benefit in patients unable to tolerate longer sequences. Further work is necessary to confirm these findings in hyperacute stroke.
authors.affiliation: Department of Radiology, Addenbrooke's Hospital and the University of Cambridge, Cambridge CB2 2QQ, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: U-King-Im
authors.forename: R A
authors.initials: RA
authors.lastname: Trivedi
authors.forename: M J
authors.initials: MJ
authors.lastname: Graves
authors.forename: K
authors.initials: K
authors.lastname: Harkness
authors.forename: H
authors.initials: H
authors.lastname: Eales
authors.forename: I
authors.initials: I
authors.lastname: Joubert
authors.forename: B
authors.initials: B
authors.lastname: Koo
authors.forename: N
authors.initials: N
authors.lastname: Antoun
authors.forename: E A
authors.initials: EA
authors.lastname: Warburton
authors.forename: J H
authors.initials: JH
authors.lastname: Gillard
authors.forename: J-C
authors.initials: JC
authors.lastname: Baron
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001921:Brain / Q000473:pathology; D002545:Brain Ischemia / Q000175:diagnosis*; D002544:Cerebral Infarction / Q000175:diagnosis*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D002546:Ischemic Attack, Transient / Q000175:diagnosis; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011785:Quality Assurance, Health Care; D012680:Sensitivity and Specificity; D013673:Technology Assessment, Biomedical