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The value of b required to avoid T2 shine-through from old lucunar infarcts in diffusion-weighted imaging

Author:
  • Bo Geijer
  • P C Sundgren
  • Arne Lindgren
  • Sara Brockstedt
  • Freddy Ståhlberg
  • Stig Holtås
Publishing year: 2001
Language: English
Pages: 511-517
Publication/Series: Neuroradiology
Volume: 43
Issue: 7
Document type: Journal article
Publisher: Springer Verlag

Abstract english

Multiple small infarcts of different ages are common in small-vessel disease. Diffusion-weighted imaging (DWI) is a powerful method for discriminating new from chronic lesions. This can be done on the diffusion-weighted images provided that b is sufficiently high. Our purpose was to determine that critical value of b. We reviewed DWI from a previous study of acute, mainly lacunar strokes, and selected 18 old lacunar infarcts, well defined on uncoded images with b 0 s/m2 (i. e., T2-weighted images) but invisible on DWI with b 1,200 x 10(6) s/m2. We used a 1.5 tesla imager and single-shot echo-planar technique. We had seven separate acquisitions with echo time 123 ms and b in steps between 0 and 1,200 x 10(6) s/m2. Two neuroradiologists blinded to the selection of lesions carried out two different lesion-detection procedures, thereby testing each lesion four times, giving a total of 72 tests of b values. The results were consistent, indicating a level for detection of 800 x 10(6) s/m2 in two tests, 400-600 x 10(6) s/m2 in 65 tests and at lower values in the remainder. For imagers up to 1.5 tesla, at long repetition times and an echo time up to 120 ms T2-shine through of old lacunar infarcts can be avoided using b of 1,000 x 10(6) s/m2.

Keywords

  • Radiology, Nuclear Medicine and Medical Imaging
  • Lacunar infarcts
  • Diffusion-weighted imaging

Other

Published
  • ISSN: 1432-1920
Freddy Ståhlberg
E-mail: freddy [dot] stahlberg [at] med [dot] lu [dot] se

Professor

Medical Radiation Physics, Lund

+46 46 17 31 19

+46 70 688 31 19

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Professor

Diagnostic Radiology, (Lund)

+46 46 17 70 30

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Project manager

MR Physics

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