AJDRAJNR - American Journal of Neuroradiology

This Article
Right arrow Abstract Freely available
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Pattany, P.M.
Right arrow Articles by Quencer, R.M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Pattany, P.M.
Right arrow Articles by Quencer, R.M.

Quantitative Analysis of the Effects of Physiologic Brain Motion on Point-Resolved Spectroscopy

P.M. Pattany, M.G. Massand, B.C. Bowen and R.M. Quencer

From the Department of Radiology, University of Miami School of Medicine, Miami, Fla


Figure 1
View larger version (13K):

[in a new window]
  		Fig 1. Schematic representation of the PRESS sequence used to acquire spectral data. The unshaded gradients pulsed are applied in the x, y, and z axes for voxel selection. The shaded gradient pulses are dephase-rephase gradients, which remove the spurious signal intensity generated by RF inhomogeneities. The 90° and 180° RF pulses are indicated. The time window for data sampling is also indicated.


Figure 2
View larger version (118K):

[in a new window]
  		Fig 2. T2-weighted axial image demonstrating voxel placement in the region of the left basal ganglia.


Figure 3
View larger version (24K):

[in a new window]
  		Fig 3. Global phase difference for PRESS (solid line) as a function of gating delay from the R wave. Note that the global phase change of the water signal intensity is minimal throughout the cardiac cycle. The STEAM (dashed line) data are from previously published work.9


Figure 4
View larger version (11K):

[in a new window]
  		Fig 4. PRESS spectra obtained from one subject, illustrating the spectral quality of gated (A) and nongated (B) acquisitions. This figure demonstrates that there is no difference in spectral quality between the 2 methods.





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X