Multi-Site Fat-Water Phantom MRI Data
Creators
- 1. University of Wisconsin, Madison
- 2. Johns Hopkins University
- 3. Vanderbilt University
- 4. University of California, San Diego
- 5. Siemens Healthcare, Baltimore, MD
- 6. Duke University
- 7. Kobe University Graduate School of Medicine
- 8. University of Texas - Southwestern
Description
Dataset description: Accompanying data for manuscript “Multi-Site,
Multi-Vendor Validation of the Accuracy and Reproducibility of
Proton-Density Fat-Fraction Quantification at 1.5T and 3T using a
Fat-Water Phantom”, submitted for publication in Magnetic Resonance in
Medicine in January 2016.
Details: The 'datasets' folder contains multiple MATLAB MAT-files
files with chemical shift-encoded (CSE) MRI data for validation of fat
quantification techniques in a fat-water phantom. Data was acquired at
six sites with different MRI vendors, two field strengths (1.5T and
3T) per site, and two protocols per field strength. The goal of these
techniques is to measure proton-density fat-fraction (PDFF) accurately
and reproducibly. Data from site 1 was acquired both at the beginning
(October 2014) and at the end (December 2015) of this study, in order
to evaluate the integrity of the phantom.
Details on the vendors, platforms and protocols are described in the
file 'vendors_platforms_protocols.pdf' in this same folder.
The phantom consists of 11 vials with different fat concentrations
(PDFF = 0%, 2.6%, 5.3%, 7.9%, 10.5%, 15.7%, 20.9%, 31.2%, 20.9%,
31.2%, 41.3%, 51.4% and 100%, respectively). At each magnet, the vials
were arranged horizontally along the B0 field and scanned with axial
slices using a 3D multi-echo spoiled gradient echo pulse sequence.
Each of the MAT-files contains the acquired complex-valued images over
the three central slices within the phantom vials. The structure
'imDataAll' contains the acquired data, with the following fields:
'TE' (echo times), 'FieldStrength' (in Tesla), 'PrecessionIsClockwise'
(describing whether water has higher resonance frequency than fat
according to the reconstruction convention), 'echo_polarity' (relative
polarity of the acquired echoes, ie: monopolar vs bipolar readouts),
'images' (five-dimensional array containing the complex valued images,
coil-combined in datasets received with multiple channels, with
dimensions X x Y x Slices x Coils x Echoes).
Additionally, the MAT-files contain reconstruction results as
described in the manuscript, in the arrays 'fwmc_*' of size X x Y x
Slices. Note that the nomenclature 'fwmc' stands for 'Fat-Water
separated with Magnitude fitting (performed after complex fitting in
order to obtain full 0-100% range of PDFF while avoiding errors
related to phase shifts in the data), and a Common initial phase for
the water and fat signals. The specific arrays are 'fwmc_ff' (PDFF
map), 'fwmc_r2star' (R2*=1/T2* decay rate), 'fwmc_w' (water image),
'fwmc_f' (fat image).
Files
PDFF_Phantom_Data.zip
Files
(183.0 MB)
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Additional details
Related works
- Is supplement to
- DOI 10.1002/mrm.26228 (Handle)