title: [Detection of acute cerebral infarction by dual echo subtraction technique in MR imaging].
abstract: The purpose of this study was to develop an image enhancement technique to detect acute cerebral infarct regions in brain MR images. Transverse relaxation times for abnormal changes tend to be longer than those for normal tissues. In order to obtain MR images with two different echo times, we employed the fast spin echo sequence. We then employed the image subtraction technique using two T(2)-weighted images to enhance acute cerebral infarct regions. As a result, the areas of acute cerebral infarct regions were enhanced as regions of higher signal than normal regions of brain tissue. Further, high signal areas in dual echo subtraction images corresponded to cerebral infarct regions of high signal areas in diffusion weighted images (DWI). We found that the image subtraction technique is useful to enhance very subtle regions of acute cerebral infarction in MR images. Because we employ the difference between transverse relaxation times for normal and abnormal tissues, which does not depend on the strength of the magnetic field, the dual echo subtraction method can be used in many hospitals.
authors.affiliation: Department of Radiological Technology, Hiroshima City Hospital.
authors.forename: Kengo
authors.initials: K
authors.lastname: Harada
authors.forename: Eiji
authors.initials: E
authors.lastname: Nishimaru
authors.forename: Takeharu
authors.initials: T
authors.lastname: Yukutomo
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ishida
mesh_terms: D000368:Aged; D001921:Brain / Q000473:pathology; D002544:Cerebral Infarction / Q000175:diagnosis*; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D013382:Subtraction Technique