DOI: 10.5061/dryad.brv15dvpj
title: Data from: Self-calibrated B<sub>1</sub><sup>+</sup> and B<sub>0</sub> Field Inhomogeneities Estimation (SAFE) in 3D Magnetic Resonance Fingerprinting

description: This dataset contains whole-brain 1mm isotropic quantitative MRI maps (T1,
 T2, PD), coil sensitivity maps, and paired 4mm isotropic field maps (B0,
 B1+) of 20 healthy adult volunteers. All data were acquired on 3T GE and
 Siemens scanners, with approval of the institutional review board, and
 informed consent was obtained. The tissue quantitative maps were acquired
 using 3D Spiral Projection Imaging MR Fingerprinting (MRF), while the
 field maps were acquired from calibration scans. Such a
 resource enables the community to utilize the SAFE method on
 their own specific MRF acquisition protocols without the need to obtain
 additional paired training data.
description: # MRF Multi-Vendor Brain Dataset at 3T ## Data Organization ``` subjects/
 ├── subject_1.mat # Siemens Vida, 6-min scan ├── subject_2.mat # Siemens
 Vida, 6-min scan ├── ... ├── subject_10.mat # Siemens Vida, 6-min scan ├──
 subject_11.mat # GE Premier, 2-min scan ├── subject_12.mat # GE Premier,
 2-min scan ├── ... └── subject_20.mat # GE Premier, 2-min scan ``` ##
 Subject Groups | Subject Range | Scanner | Scan Duration | SNR Level | |
 ------------- | ------------ | ------------- | --------- | | 1-10 |
 Siemens Vida | 6 minutes | Higher | | 11-20 | GE Premier | 2 minutes |
 Lower | ## Data Contents Each `.mat` file contains the following
 variables: ### Quantitative Maps (1 mm isotropic) | Variable | Description
 | Units | | -------- | -------------------------------- | ----- | | `T1` |
 Longitudinal relaxation time map | ms | | `T2` | Transverse relaxation
 time map | ms | | `PD` | Proton density map | a.u. | ### Field Maps (4 mm
 isotropic, from calibration scans, co-registered) | Variable | Description
 | Units | | -------- | ------------------------------------- |
 -------------- | | `B0` | Main magnetic field inhomogeneity map | Hz | |
 `B1` | Transmit field (B1+) efficiency map | relative units | ###
 Auxiliary Data | Variable | Description | | ------------------ |
 ----------------------------------- | | `coil_sensitivity` | Multi-channel
 coil sensitivity maps | ## Acquisition Parameters ### Common Parameters
 (All Subjects) * **Field Strength**: 3T * **Sequence**: 3D Spiral
 Projection Imaging MR Fingerprinting * **Resolution**: 1 mm isotropic (T1,
 T2, PD), 4 mm isotropic (B0, B1+ from calibration scans) * **Coverage**:
 Whole brain ### Siemens Vida (Subjects 1-10) * **Scan Duration**: 6
 minutes * **Characteristics**: Higher SNR due to lower undersampling rate
 ### GE Premier (Subjects 11-20) * **Scan Duration**: 2 minutes *
 **Characteristics**: Lower SNR due to higher undersampling rate ## Data
 Format * **File Format**: MATLAB .mat * **Compatibility**: Compatible with
 MATLAB and Python (scipy.io) ### Loading Data #### MATLAB ```matlab data =
 load('subject_1.mat'); T1_map = data.T1_map; T2_map =
 data.T2_map; PD_map = data.PD_map; B0_map = data.B0_map; B1_map =
 data.B1_map; coil_sens = data.Coil_map; ``` #### Python ```python from
 scipy.io import loadmat data = loadmat('subject_1.mat') T1_map =
 data['T1_map'] T2_map = data['T2_map'] PD_map =
 data['PD_map'] B0_map = data['B0_map'] B1_map =
 data['B1_map'] coil_sens = data['Coil_map'] ``` ##
 Notes * Field maps (B0, B1+) are acquired from separate calibration scans
 at 4 mm isotropic resolution and co-registered to the quantitative maps *
 Quantitative maps (T1, T2, PD) are derived from the same MRF acquisition
 at 1 mm isotropic resolution * Coil sensitivity maps can be used for
 parallel imaging reconstruction or sensitivity-related corrections ##
 Citation If you use this dataset in your research, we request that you
 consider citing appropriately. ## Human subjects data Data were acquired
 under IRB approval with informed consent obtained from all participants
 for public sharing. All datasets have been de-identified as .mat files by
 removing any personally identifiable information.