mri-sequences
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mri-sequences [2023/02/23 13:11] – created jonas | mri-sequences [2024/02/19 14:52] (current) – ari | ||
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- | ==== MPRAGE | + | ===== Structural ===== |
+ | ==== T1-weighted ==== | ||
+ | === MPRAGE | ||
High resolution, T< | High resolution, T< | ||
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| Flip angle | 9 deg | | Flip angle | 9 deg | ||
| Parallel imaging | | Parallel imaging | ||
+ | |||
+ | ====T2-weighted==== | ||
+ | === Turbo Spin Echo (TSE) === | ||
+ | Quick, high (in-plane) resolution, T< | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 1 min 38 s | | ||
+ | | Type | 2D | | ||
+ | | Slices | ||
+ | | Slice thickness | ||
+ | | Slice gap | 30% (1.2 mm) | | ||
+ | | FOV | 220 mm x 220 mm | | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | | TR | 5060 ms | | ||
+ | | TE | 102 ms | | ||
+ | | Flip angle | 140 deg | ||
+ | | Parallel imaging | ||
+ | |||
+ | === TSE FLAIR === | ||
+ | High (in-plane) resolution, T< | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 4 min 32 s | | ||
+ | | Type | 2D | | ||
+ | | Slices | ||
+ | | Slice thickness | ||
+ | | Slice gap | 30% (1.2 mm) | | ||
+ | | FOV | 220 mm x 220 mm | | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | | TR | 9000 ms | | ||
+ | | TI | 2500 ms | | ||
+ | | TE | 100 ms | | ||
+ | | Flip angle | 150 deg | ||
+ | |||
+ | ===== Diffusion MRI ===== | ||
+ | High resolution, T< | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 8 min 52 s | | ||
+ | | Type | 2D (Axial slices) | ||
+ | | b-value | ||
+ | | Number of directions | ||
+ | | FOV | 192 mm x 192 mm | | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | | TR | 7800 ms | | ||
+ | | TE | 90 ms | | ||
+ | | Flip angle | ||
+ | | Parallel imaging | ||
+ | |||
+ | |||
+ | ===== BOLD fMRI ===== | ||
+ | T< | ||
+ | |||
+ | ==== Standard fMRI ==== | ||
+ | Functional MRI with 3 mm isotropic spatial resolution | ||
+ | |||
+ | === EPI_Standard === | ||
+ | Standard fMRI, 2 s per volume | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 2 s (per volume) | ||
+ | | Type | 2D | | ||
+ | | Slices | ||
+ | | Slice thickness | ||
+ | | Slice gap | 25% (0.75 mm) | | ||
+ | | Slice order | Descending (32 - 1) | | ||
+ | | FOV | 192 mm x 192 mm | | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | | TR | 2000 ms | | ||
+ | | TE | 30 ms | | ||
+ | | Flip angle | 78 deg | | ||
+ | | Bandwidth | ||
+ | | Echo spacing | ||
+ | |||
+ | === EPI_Standard_1s === | ||
+ | Standard fMRI, 1 s per volume with reduced brain coverage | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 1 s (per volume) | ||
+ | | Slices | ||
+ | | Slice order | Descending (16 - 1) | | ||
+ | | TR | 1000 ms | | ||
+ | | Bandwidth | ||
+ | | Echo spacing | ||
+ | Other parameters are those of EPI_Standard. | ||
+ | |||
+ | ==== High Resolution fMRI ==== | ||
+ | Functional MRI with 2 mm isotropic or higher spatial resolution | ||
+ | |||
+ | === EPI_HighRes_2iso === | ||
+ | fMRI with 2 mm isotropic spatial resolution, 2 s per volume. Keep in mind that the thinner slices leads to reduced brain coverage! | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 2 s (per volume) | ||
+ | | Type | 2D | | ||
+ | | Slices | ||
+ | | Slice thickness | ||
+ | | Slice gap | 25% (0.5 mm) | | ||
+ | | Slice order | Descending (32 - 1) | | ||
+ | | FOV | 192 mm x 192 mm | | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | | TR | 2000 ms | | ||
+ | | TE | 30 ms | | ||
+ | | Flip angle | 78 deg | | ||
+ | | Bandwidth | ||
+ | | Echo spacing | ||
+ | | Parallel imaging | ||
+ | |||
+ | === EPI_HighRes_2iso_WholeBrain === | ||
+ | fMRI with 2 mm isotropic spatial resolution, 40 slices for a whole brain coverage. Keep in mind that acquiring more slices leads to longer acquisition time! | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 2.5 s (per volume) | ||
+ | | Slices | ||
+ | | TR | 2500 ms | | ||
+ | Other parameters are those of EPI_HighRes_2iso. | ||
+ | |||
+ | === EPI_HighRes_2iso_LargerFOV === | ||
+ | fMRI with 2 mm isotropic spatial resolution, with a FOV of 205 mm for patricipants with larger head. Keep in mind that acquiring slices with larger FOV leads to slightly fewer slices thus slightly more reduced brain coverage! | ||
+ | |||
+ | ^ Parameter | ||
+ | | Slices | ||
+ | | FOV | 205 mm x 205 mm | | ||
+ | | Matrix | ||
+ | | Bandwidth | ||
+ | | Echo spacing | ||
+ | Other parameters are those of EPI_HighRes_2iso. | ||
+ | |||
+ | === EPI_HighRes_1.5x1.5x2mm === | ||
+ | fMRI with 1.5 mm in-plane (highest achievable) spatial resolution, 2 s per volume. Keep in mind that acquiring slices with higher resolution leads to slightly fewer slices thus slightly more reduced brain coverage! | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 2 s (per volume) | ||
+ | | Slices | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | | Bandwidth | ||
+ | | Echo spacing | ||
+ | Other parameters are those of EPI_HighRes_2iso. | ||
+ | |||
+ | ===== Fieldmap ===== | ||
+ | Magnetic field mapping sequences required to | ||
+ | * undistort EPI data (e.g. fMRI, DWI) | ||
+ | * measure functional sensitivity | ||
+ | |||
+ | :!: It has to be acquired with the same geometry (FOV, resolution, alignment, slice centre) as the EPI data! :!: | ||
+ | |||
+ | ==== Standard Fieldmap ==== | ||
+ | Fieldmap with 3 mm isotropic spatial resolution. It matches with Standard fMRI sequences. | ||
+ | |||
+ | === Fieldmapping === | ||
+ | Dual-echo fieldmap | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 54 s | | ||
+ | | Type | 2D | | ||
+ | | Slices | ||
+ | | Slice thickness | ||
+ | | Slice gap | 25% (0.75 mm) | | ||
+ | | FOV | 192 mm x 192 mm | | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | | TR | 400 ms | | ||
+ | | TE | 5.19 ms, 7.65 ms | | ||
+ | | Flip angle | 60 deg | | ||
+ | ==== High Resolution Fieldmaps ==== | ||
+ | |||
+ | Fieldmaps 2 mm isotropic or higher spatial resolution. They match with High resolution fMRI sequences. | ||
+ | |||
+ | === Fieldmapping_2iso === | ||
+ | High resolution dual-echo fieldmap | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 1 m 19 s | | ||
+ | | Type | 2D | | ||
+ | | Slices | ||
+ | | Slice thickness | ||
+ | | Slice gap | 25% (0.5 mm) | | ||
+ | | FOV | 192 mm x 192 mm | | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | | TR | 400 ms | | ||
+ | | TE | 5.19 ms, 7.65 ms | | ||
+ | | Flip angle | 60 deg | | ||
+ | |||
+ | === Fieldmapping_2iso_WholeBrain === | ||
+ | High resolution dual-echo fieldmap with whole brain coverage | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 1 m 26 s | | ||
+ | | Slices | ||
+ | | TR | 437 ms | | ||
+ | Other parameters are those of Fieldmapping_2iso. | ||
+ | |||
+ | === Fieldmapping_2iso_LargerFOV === | ||
+ | High resolution dual-echo fieldmap with larger FOV | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 1 m 24 s | | ||
+ | | Slices | ||
+ | | FOV | 205 mm x 205 mm | | ||
+ | | Matrix | ||
+ | Other parameters are those of Fieldmapping_2iso. | ||
+ | |||
+ | === Fieldmapping_1.5x1.5x2mm === | ||
+ | High resolution dual-echo fieldmap with our highest achievable in-plane resolution | ||
+ | |||
+ | ^ Parameter | ||
+ | | Acquisition time | 1 m 45 s | | ||
+ | | Slices | ||
+ | | Matrix | ||
+ | | Resolution | ||
+ | Other parameters are those of Fieldmapping_2iso. | ||
+ | |||
mri-sequences.1677157863.txt.gz · Last modified: 2023/02/23 13:11 by jonas