MR images based on gradient echoes are sensitive to artifacts caused by inhomogeneities of the static magnetic field. This paper describes the effects of local gradients in rapid FLASH MR images and presents a way of directly imaging affected areas. The idea is to compensate for signal losses due to
SYS-FLASH. Systemic saturation in FLASH MR imaging
β Scribed by Dieter Matthaei; Axel Haase
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 258 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0740-3194
No coin nor oath required. For personal study only.
β¦ Synopsis
A simple modification of FLASH (Fast Low Angle SHot) MR imaging, which results in a variable reduction of the intensity of flowing blood and flow artifacts in transaxial tomograms, is reported. Here a nonselective radiofrequency pulse of variable flip angle is used before the acquisition of each projection in FLASH imaging to saturate flowing blood within the whole volume (Systemic Saturation = SYS-FLASH). o 1987 Academic press, Inc.
π SIMILAR VOLUMES
Rapid FLASH (fast low angle shot) NMR images are very sensitive to flow phenomena. In particular, a steady reflow of unsaturated spins from outside the imaging plane results in high image intensities which depend on the flip angle, the repetition time, and the flow velocity. Here we describe a techn
## Abstract Radiofrequency (RF) field inhomogeneity is an unavoidable problem in MRI, and it becomes severe at high magnetic fields due to the dependence of __B__~1~ on the sample. It leads to nonuniformities in image intensity and contrast, causing difficulties in quantitative interpretation and i
A fast method for quantitative NMR imaging of flow velocities in intact plants is described. The purpose of this method is to observe dynamic changes of flow velocity in the xylem of plants after fast changes of environmental conditions. The spatial image resolution is 47 Ψ 188 m 2 in-plane. The met
## Abstract ## Purpose To develop technical advances for realβtime magnetic resonance imaging (MRI) that allow for improved image quality and high frame rates. ## Materials and Methods The approach is based on a combination of fast lowβangle shot (FLASH) MRI sequences with radial data sampling a