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Size: 1862
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Size: 1858
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 6: | Line 6: |
| || Acquisition time || 2 s (per volume) || | || Acquisition time || 2 s (per volume) || |
| Line 18: | Line 18: |
| || Bandwidth || 2232 Hz/Px || | || Bandwidth || 2232 Hz/Px | |
Standard imaging sequences
CBU_EPI
Description |
Standard EPI sequence for fMRI |
Acquisition time |
2 s (per volume) |
Type |
2D |
Slices |
32 |
Slice gap |
25% |
Slice thickness |
3 mm |
Slice order |
Interleaved (1, 3, 5... 2, 4, 6) |
FOV |
192 mm x 192 mm |
Matrix |
64 x 64 |
Resolution |
3 mm x 3mm |
TR |
2000 ms |
TE |
30 ms |
Flip angle |
78 deg |
|| Bandwidth || 2232 Hz/Px |
Trigger pulse timing
To within a few ms, the stimulus delivery trigger pulse happens 35 ms before the acquisition of the first scan (centre of k space) of each volume. Note there is a latency of 20 ms in the visual display. The trigger pulse length is 1 ms.
Slice order
The slice order is interleaved: 1, 3, 5... 2, 4, 6. To put this into SPM directly when asked for the slice order write [1:2:31 2:2:32]. This is the default for aa_ver1
CBU_MPRAGE
Description |
High-resolution structural MRI |
Acquisition time |
4 min 16 s |
Type |
3D |
FOV |
256 mm x 240 mm x 160 mm |
Matrix |
256 x 240 x 160 |
Resolution |
1 mm isotropic |
TR |
2250 ms |
TI |
900 ms |
TE |
2.99 ms |
Flip angle |
9 deg |
Parallel imaging |
GRAPPA BR Acceleration factor PE: 2 BR Reference lines PE: 24 |
CBU_Fieldmapping
Description |
Magnetic field mapping sequence. Required for BR - undistortion of fMRI data BR - functional sensitivity mapping |
Acquisition time |
54 s |
Type |
2D |
Slices |
32 |
Slice gap |
25% |
Slice thickness |
3 mm |
FOV |
192 mm x 192 mm |
Matrix |
64 x 64 |
Resolution |
3 mm x 3 mm |
TR |
400 ms |
TE |
5.19 ms / 7.65 ms |
Flip angle |
60 deg |