IBT data for A4IM project

The images obtained at IBT-CMR (Zürich, Switzerland) has been acquired in an MRI prototype based on the Philips Ingenia Ambition X, ramped down to 0.6T. The strong gradient performance with a slew rate of 200 T/m/s and maximum amplitude of 45 mT/m are thus maintained, albeit not fully exploited for the present protocols. The used coils are a standard 14 channel head coil. The data was subsequently exported using MRecon and a custom exporter from the Philips Raw Data format to ISMRMRD. All the data was generated using ten volunteers. Anonymized information on the sex, and age is provided below. The subject numbering used here corresponds to the numbering specified in the folder and file names of this database.Subject 1: Male. 25 years.Subject 2: Male. 55 years.Subject 3: Female. 29 years.Subject 4: Female. 30 years.Subject 5: Male. 25 years.Subject 6: Male. 30 years.Subject 7: Male. 29 years.Subject 8: Male. 26 years.Subject 9: Female. 27 years.Subject 10: Male. 25 years. For a given subject acting as a volunteer, we distinguish between the application of (a) a qualitative protocol and (b) a quantitative protocol. The qualitative protocol consists of running three consecutive multi-slice 2D FSE sequences, optimized to obtain PD-, T1-, and T2-weighted images. This protocol requires approximately 9 minutes of sequence execution time. The quantitative protocol consists of acquiring two sets of images: (1) an accelerated multi-slice GraSE (using an EPI readout) RARE sequences with varying effective echo times (TEeff) to obtain a multi-slice T2 map, and (2) a b-TFE sequence with varying inversion times to obtain a multi-slice T1 map. Both the quantitative and qualitative protocol was acquired for the same patient in the same position. In the tables below are listed the main parameters of the sequences performed for both protocols. Table 1. Sequence parameters for qualitative protocol PD-w T1-w T2-w Sequence type 2D Fast Spin Echo 2D Fast Spin Echo 2D Fast Spin Echo Repetition time (TR) in ms 3000 600 3000 Echo time (TE) in ms 5.125 5.125 70 Echo Train Length (ETL) 8 8 8 Flip Angle in ° 90 90 90 Number of averages 3 14 3 Inversion times (TIs) in ms None None None FOV in mm 230 x 180 230 x 180 230 x 180 Matrix size 232 x 176 232 x 176 232 x 176 Readout oversampling 2 2 2 Resolution in mm ~ 1 x 1 ~ 1 x 1 ~ 1 x 1 Slice thickness in mm 5 5 5 Number of slices 3 3 3 Gap between slices in mm 10 10 10 Slice positions Axial oblique Axial oblique Axial oblique Acquisition bandwidth in Hz/px 748 748 108 Scan time in seconds 204 203 204 Table 2. Sequence parameters for quantitative protocol T1-Map T2-Map Sequence type B-TFE T1M_MSK T2 GraSE (EPI) Repetition time (TR) in ms 4.74 1000 Echo time (TE) in ms 2.08 21, 32, 43, 54, 64, 75, 86, 96, 107*, 118* EPI-factor None 7 Readouts lines per shot 120 77 Flip Angle in ° 90° 90° Number of averages 1 3 Inversion times (TIs) in ms 49, 3049, 6049, 9049, 12049, 199, 3199, 6199, 350, 3350, 6350 None FOV in mm 230 x 180 230 x 180 Matrix size 152 x 119 152 x 120 Readout oversampling 2 2 Partial Fourier Factor 0.85 None Resolution in mm ~ 1.5 x 1.5 ~ 1.5 x 1.5 Slice thickness in mm 10 10 Number of slices 3 3 Gap between slices in mm 5 10 Slice positions Axial oblique Axial oblique Acquisition bandwidth in Hz/px 290 1281 Scan time in seconds 153 164 * Not acquired for Subject 1