English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Slice selection and T1 contrast in FLASH NMR imaging.

Hänicke, W., Merboldt, K. D., & Frahm, J. (1988). Slice selection and T1 contrast in FLASH NMR imaging. Journal of Magnetic Resonance, 77(1), 64-74. doi:10.1016/0022-2364(88)90032-7.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-E821-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-E824-C
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Hänicke, W.1, Author              
Merboldt, K. D.1, Author              
Frahm, J.2, Author              
Affiliations:
1Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society, ou_578634              
2Research Group of Biomedical NMR, MPI for Biophysical Chemistry, Max Planck Society, ou_578633              

Content

show
hide
Free keywords: -
 Abstract: This paper describes the signal intensity in rapid FLASH NMR imaging as a function of the repetition time, the NMR relaxation times, the flip angle, and the shape of the tailored RF pulses used for slice selection. In the absence or after elimination of signal contributions from transverse coherences the theoretical treatment may be confined to a steady state of the longitudinal magnetization. It turns out that deviations from a rectangular excitation profile due to imperfect pulse shapes strongly alter both the dynamic approach to steady-state conditions and the resulting saturation behavior as expected from theoretical expressions. As a consequence the signal-to-noise and image contrast become dependent on the actual slice profile. In T1 images calculated from series of FLASH images with different flip angles or repetition times qualitative relations between tissues with different T1 values are borne out correctly, whereas the accuracy of T1 relaxation times may not be satisfactory. No restrictions are expected for 3D imaging using a spatially homogeneous RF excitation. Experiments have been carried out on phantoms and human volunteers using a Bruker 2.35 T 40 cm NMR system.

Details

show
hide
Language(s): eng - English
 Dates: 1988-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/0022-2364(88)90032-7
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Magnetic Resonance
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 77 (1) Sequence Number: - Start / End Page: 64 - 74 Identifier: -