BACKGROUND AND PURPOSE: Serial study of such MR parameters as diffusion-weighted imaging (DWI), apparent diffusion coefficient (ADC), ADC with fluid-attenuated inversion recovery (ADC(FLAIR)), and T2-weighted imaging may provide information on the pathophysiological mechanisms of acute ischemic stroke. Our goals were to establish the natural evolution of MR signal intensity characteristics of acute ischemic lesions and to assess the potential of using specific MR parameters to estimate lesion age. METHODS: Five serial echo-planar DWI studies with and without an inversion recovery pulse were performed in 27 patients with acute stroke. The following lesion characteristics were studied: 1) conventional ADC (ADC(CONV)); 2) ADC(FLAIR); 3) DWI signal intensity (SI(DWI)); 4) T2-weighted signal intensity (SI(T2)), and 5) FLAIR signal intensity (SI(FLAIR)). RESULTS: The lesion ADC(CONV) gradually increased from low values during the first week to pseudonormal during the second week to supranormal thereafter. The lesion ADC(FLAIR) showed the same pattern of evolution but with lower absolute values. A low ADC value indicated, with good sensitivity (88%) and specificity (90%), that a lesion was less than 10 days old. All signal intensities remained high throughout follow-up. SI(DWI) showed no significant change during the first week but decreased thereafter. SI(T2) initially increased, decreased slightly during week 2, and again increased after 14 days. SI(FLAIR) showed the same initial increase as the SI(T2) but remained relatively stable thereafter. CONCLUSION: Our findings further clarify the time course of stroke evolution on MR parameters and indicate that the ADC map may be useful for estimating lesion age. Application of an inversion recovery pulse results in lower, potentially more accurate, absolute ADC values.
BACKGROUND AND PURPOSE: Serial study of such MR parameters as diffusion-weighted imaging (DWI), apparent diffusion coefficient (ADC), ADC with fluid-attenuated inversion recovery (ADC(FLAIR)), and T2-weighted imaging may provide information on the pathophysiological mechanisms of acute ischemic stroke. Our goals were to establish the natural evolution of MR signal intensity characteristics of acute ischemic lesions and to assess the potential of using specific MR parameters to estimate lesion age. METHODS: Five serial echo-planar DWI studies with and without an inversion recovery pulse were performed in 27 patients with acute stroke. The following lesion characteristics were studied: 1) conventional ADC (ADC(CONV)); 2) ADC(FLAIR); 3) DWI signal intensity (SI(DWI)); 4) T2-weighted signal intensity (SI(T2)), and 5) FLAIR signal intensity (SI(FLAIR)). RESULTS: The lesion ADC(CONV) gradually increased from low values during the first week to pseudonormal during the second week to supranormal thereafter. The lesion ADC(FLAIR) showed the same pattern of evolution but with lower absolute values. A low ADC value indicated, with good sensitivity (88%) and specificity (90%), that a lesion was less than 10 days old. All signal intensities remained high throughout follow-up. SI(DWI) showed no significant change during the first week but decreased thereafter. SI(T2) initially increased, decreased slightly during week 2, and again increased after 14 days. SI(FLAIR) showed the same initial increase as the SI(T2) but remained relatively stable thereafter. CONCLUSION: Our findings further clarify the time course of stroke evolution on MR parameters and indicate that the ADC map may be useful for estimating lesion age. Application of an inversion recovery pulse results in lower, potentially more accurate, absolute ADC values.
Authors: M E Moseley; Y Cohen; J Mintorovitch; L Chileuitt; H Shimizu; J Kucharczyk; M F Wendland; P R Weinstein Journal: Magn Reson Med Date: 1990-05 Impact factor: 4.668
Authors: L D'Olhaberriague; K M Welch; V Nagesh; C Gymnopoulos; H H Mansbach; J W Hugg; M D Boska; R A Knight; L R Schultz; S R Levine; M Chopp Journal: J Neurol Sci Date: 1998-04-01 Impact factor: 3.181
Authors: E Busch; K Krüger; P R Allegrini; C M Kerskens; M L Gyngell; M Hoehn-Berlage; K A Hossmann Journal: J Cereb Blood Flow Metab Date: 1998-04 Impact factor: 6.200
Authors: A G Sorensen; F S Buonanno; R G Gonzalez; L H Schwamm; M H Lev; F R Huang-Hellinger; T G Reese; R M Weisskoff; T L Davis; N Suwanwela; U Can; J A Moreira; W A Copen; R B Look; S P Finklestein; B R Rosen; W J Koroshetz Journal: Radiology Date: 1996-05 Impact factor: 11.105
Authors: P A Barber; D G Darby; P M Desmond; Q Yang; R P Gerraty; D Jolley; G A Donnan; B M Tress; S M Davis Journal: Neurology Date: 1998-08 Impact factor: 9.910
Authors: L H Schwamm; W J Koroshetz; A G Sorensen; B Wang; W A Copen; R Budzik; G Rordorf; F S Buonanno; P W Schaefer; R G Gonzalez Journal: Stroke Date: 1998-11 Impact factor: 7.914
Authors: C Pierpaoli; J R Alger; A Righini; J Mattiello; R Dickerson; D Des Pres; A Barnett; G Di Chiro Journal: J Cereb Blood Flow Metab Date: 1996-09 Impact factor: 6.200
Authors: T Das; F Settecase; M Boulos; T Huynh; C D d'Esterre; S P Symons; L Zhang; R I Aviv Journal: AJNR Am J Neuroradiol Date: 2015-02-26 Impact factor: 3.825
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Authors: H Ay; L Gungor; E M Arsava; J Rosand; M Vangel; T Benner; L H Schwamm; K L Furie; W J Koroshetz; A G Sorensen Journal: Neurology Date: 2009-12-16 Impact factor: 9.910