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

Geijer, Bo LU ; Sundgren, P C; Lindgren, Arne LU ; Brockstedt, Sara LU ; Ståhlberg, Freddy LU and Holtås, Stig LU (2001) In Neuroradiology 43(7). p.511-517
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Lacunar infarcts, Diffusion-weighted imaging
in
Neuroradiology
volume
43
issue
7
pages
511 - 517
publisher
Springer Verlag
external identifiers
  • pmid:11512577
  • scopus:0034918480
ISSN
1432-1920
DOI
10.1007/s002340100544
language
English
LU publication?
yes
id
732cd575-b0e1-48be-b6dc-858df27f81bc (old id 1121071)
date added to LUP
2008-06-27 14:20:05
date last changed
2018-05-29 09:37:37
@article{732cd575-b0e1-48be-b6dc-858df27f81bc,
  abstract     = {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.},
  author       = {Geijer, Bo and Sundgren, P C and Lindgren, Arne and Brockstedt, Sara and Ståhlberg, Freddy and Holtås, Stig},
  issn         = {1432-1920},
  keyword      = {Lacunar infarcts,Diffusion-weighted imaging},
  language     = {eng},
  number       = {7},
  pages        = {511--517},
  publisher    = {Springer Verlag},
  series       = {Neuroradiology},
  title        = {The value of b required to avoid T2 shine-through from old lucunar infarcts in diffusion-weighted imaging},
  url          = {http://dx.doi.org/10.1007/s002340100544},
  volume       = {43},
  year         = {2001},
}