scholarly journals Three-dimensional myocardial deformations: calculation with displacement field fitting to tagged MR images.

Radiology ◽  
1995 ◽  
Vol 195 (3) ◽  
pp. 829-835 ◽  
Author(s):  
W G O'Dell ◽  
C C Moore ◽  
W C Hunter ◽  
E A Zerhouni ◽  
E R McVeigh
Keyword(s):  
Displacement Field ◽  
Three Dimensional ◽  
Mr Images ◽  
Tagged Mr Images

scholarly journals Calculation of three-dimensional left ventricular strains from biplanar tagged MR images

1992 ◽  
Vol 2 (2) ◽  
pp. 165-175 ◽  
Author(s):  
Christopher C. Moore ◽  
Walter G. O'Dell ◽  
Elliot R. McVeigh ◽  
Elias A. Zerhouni
Keyword(s):  
Three Dimensional ◽  
Left Ventricular ◽  
Mr Images ◽  
Tagged Mr Images

scholarly journals Three-dimensional plus time biventricular strain from tagged MR images by phase-unwrapped harmonic phase

2011 ◽  
Vol 34 (4) ◽  
pp. 799-810 ◽  
Author(s):  
Bharath Ambale Venkatesh ◽  
Chun G. Schiros ◽  
Himanshu Gupta ◽  
Steven G. Lloyd ◽  
Louis Dell'Italia ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Mr Images ◽  
Harmonic Phase ◽  
Tagged Mr Images

Truss and Beam Finite Elements Revisited: A Derivation Based on Displacement-Field Decomposition

1996 ◽  
Vol 11 (4) ◽  
pp. 371-380 ◽  
Author(s):  
Alphose Zingoni
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Symmetry Group ◽  
Displacement Field ◽  
Three Dimensional ◽  
Beam Elements ◽  
Symmetry Properties ◽  
Mass Matrices ◽  
General Displacement

Where a finite element possesses symmetry properties, derivation of fundamental element matrices can be achieved more efficiently by decomposing the general displacement field into subspaces of the symmetry group describing the configuration of the element. In this paper, the procedure is illustrated by reference to the simple truss and beam elements, whose well-known consistent-mass matrices are obtained via the proposed method. However, the procedure is applicable to all one-, two- and three-dimensional finite elements, as long as the shape and node configuration of the element can be described by a specific symmetry group.

K-space filter effect in three-dimensional contrast MR angiography

1997 ◽  
Vol 38 (1) ◽  
pp. 173-175 ◽  
Author(s):  
K. Ito ◽  
J. Kato ◽  
S. Okada ◽  
T. Kumazaki
Keyword(s):  
Contrast Agent ◽  
Data Acquisition ◽  
Mr Angiography ◽  
Three Dimensional ◽  
Mr Images ◽  
Acquisition Period ◽  
Filter Effect ◽  
Flowing Material ◽  
Space Filter

Purpose: In three-dimensional (3-D) contrast MR angiography, temporal misregistration between the data acquisition period and the arrival of the contrast agent in the target vessels is thought to degrade the quality of the reconstructed images. The purpose of this study was to demonstrate and investigate this effect in phantom experiments. Material and Methods: MR images of a phantom tube were evaluated with flowing materials of water or Gd-DTPA solution by changing from water to Gd-DTPA solution halfway through the data acquisition period. Results: While no signal could be acquired with a stream of water in the tube, a clear signal was obtained with a flow of Gd-DTPA solution. Blurring and ghost artifacts surrounding the tube along the phase-encoding direction were observed when the flowing material was changed from water to Gd-DTPA solution halfway through the data acquisition period. Conclusion: K-space filter effect occurs during 3-D contrast MR angiography owing to the transient passage of the contrast agent, and this effect causes spatial artifacts in the reconstructed images.

Sign in / Sign up

Export Citation Format

Share Document