Author: Johannes Mayer

Copyright 2021 Physikalisch-Technische Bundesanstalt (PTB)
If used in accordance with the supplied licence please cite the Digital Object Identifier (DOI) 10.5281/zenodo.3647967
It contains 3D MR golden-angle radial phase encoding [parallel cartesian readouts with phase encoding points assembled on a non-uniform grid] acquisition data of a standard ACR resolution phantom.


The data were acquired on a Siemens scanner and converted into ISMRMRD format using a converter ( https://github.com/ismrmrd/siemens_to_ismrmrd ).

Imaging Modality: MRI
Institution: Physikalisch-Technische Bundesanstalt
Scanner: SIEMENS Verio 3T
Image/KSpace Data Dimension = 3D
File format: ISMRMRD (ISMRM Raw Data, http://ismrmrd.github.io/)
File extension: .h5

Dataset name: PTB GRPE Resolution Phantom 3D 


The dataset contains multiple files: 

ResPhantom_CV_nav_GRPE_itl_ismrmrd.h5

Selection of Parameters:

FOV: 512x256x256 mm**3
Resolution: (2.0 x 2.0 x 2.0) mm**3

Magnetic field strength 2.89 T
Sequence Type: Gradient Echo (FLASH)
TR = 4.35 ms
TE = 1.95 ms
Flip angle = 12.0 degree

The data reconstruction is possible based solely on the metadata contained in the dataset header. The trajectory information of the readout distribution in the phase encoding plane is stored in the appropriate ISMRMRD Acquisition data structure and data can be reconstructed using a non-uniform fast fourier transform. As sampling in the readout direction is performed cartesian the x-coordinate of the trajectory contains zeros as placeholders, reconstruction in this dimension can be performed using the fast fourier transform and does not require trajectory information.


3DRPE_Lowres.h5

Selection of Parameters:

FOV: 576x288x288 mm**3
Resolution: (4.5 x 4.5 x 4.5) mm**3

Magnetic field strength 2.89 T
Sequence Type: Gradient Echo (FLASH)
TR = 4.5 ms
TE = 2.08 ms
Flip angle = 12.0 degree

The data reconstruction is not possible solely based on the provided meta data. The trajectory information for gridding needs to be computed using for example information provided in the publication doi:10.1002/mrm.22102. This file serves as a raw test data file that can be used to test pre-processing of RPE data.



3DRPE_Lowres_Dualecho.h5

Selection of Parameters:

FOV: 576x288x288 mm**3
Resolution: (4.5 x 4.5 x 4.5) mm**3

Magnetic field strength 2.89 T
Sequence Type: Gradient Echo (FLASH)
TR = 7.2 ms
TE1 = 2.08 ms
TE2 = 4.74 ms
Flip angle = 12.0 degree

This file contains a second echo acquired with an inverted readout. The data reconstruction is not possible solely based on the provided meta data. The trajectory information for gridding needs to be computed using for example information provided in the publication doi:10.1002/mrm.22102. This file serves as a raw test data file that can be used to test pre-processing of RPE data.