Rapid changes in the apparent diffusion coefficient of water following brain ischemia have been extensively studied using echo planar diffusion imaging at low fields (2.0 T). There is a desire to perform these studies at higher fields (>3.0 T) where the benefits of improved signal-to-noise can be exploited. Unfortunately, EPI diffusion is technically difficult to implement at high fields because of large magnetic susceptibility effects. This article demonstrates the feasibility of employing a line-scan diffusion protocol for ADCw measurements in stroke. The technique was applied on a 4.0 T system to monitor the decline in ADCw following the induction of focal cerebral ischemia in rat. ADCw data were acquired every 15 s with 10 b-values or every 22.5 s with 15 b-values, with a cubic spatial resolution of 1.5 mm. The results demonstrate that estimates of ADCw can be acquired with coefficients of variation under 3.0%, and with a combination of spatial and temporal resolution comparable to that previously reported for EPI.
|Original language||English (US)|
|Number of pages||8|
|Journal||NMR in Biomedicine|
|State||Published - Apr 1 1997|
ASJC Scopus subject areas
- Molecular Medicine
- Radiology Nuclear Medicine and imaging