MRE/Wave beta release
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Wave inversion
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| Wave Inversion - Test Data
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Located in the test_data directory are magnitude and phase difference data
sets. It is a single slice data set with 8 phase offset, FOV=20cm, and
100hz driving frequency with 1 motion encoding gradient. The unsigned
character data set has a resolution of 256 x 256 x 8. To open the
data bring up the standard Windows File screen.
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When the load screen comes up, There are several options for naming the data
set. The default is to simply name the data after the filename. Also, Check 2d
option to display the data.
For loading in dicom images from multiple files, select all
files in the open screen and open with "load in stack".
After loading in data, these windows should be available.
Select the "wave inversion" button on the tool bar.
Enter file names and continue.
Enter experiment parameters.
An interactive mask tool lets you adjust the mask.
NOTE
output file names use a C format syntax. In the above example a window named
mask_00 will be generated. This is the equivalent of the C format function
sfprintf(,"mask_%02d", count) As a further example suppose:
name = %s_mask%d
base_name = phantom
count = 6
This is equivalent to the C format function sprintf(,"%s_mask%d",
"phantom", count) and will generate "phantom_mask6".
The current data set does not need phase unwrapping or filtering so we continue to the output window.
Selecting these outputs produce the interpolated wave propagation and the
displacement map in mm. The first time mrewave
executes, the FFTW routines perform a performance calibration. This
calibration can take 10s of seconds. Subsequent calculation will skip
this calibration and run much faster.
Finally, generating the stiffness estimate. The values are in kilopascals (kPa)
Bring up the window/level controls (ctrl L)
View the color map with "vert color bar". With the mouse positioned over the calibration wedge, the bitmap can be copied with a right mouse click.
