The value of b required to avoid T2 shine-through from old lucunar infarcts in diffusion-weighted imaging
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1121071
- author
- Geijer, Bo LU ; Sundgren, P C ; Lindgren, Arne LU ; Brockstedt, Sara LU ; Ståhlberg, Freddy LU and Holtås, Stig LU
- organization
- publishing date
- 2001
- 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
- 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
- 2016-04-01 11:37:56
- date last changed
- 2022-04-12 22:57:06
@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}},
keywords = {{Lacunar infarcts; Diffusion-weighted imaging}},
language = {{eng}},
number = {{7}},
pages = {{511--517}},
publisher = {{Springer}},
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}},
doi = {{10.1007/s002340100544}},
volume = {{43}},
year = {{2001}},
}