Difference between revisions of "Spiral.m"
(Created page with "{{DISPLAYTITLE:spiral.m.m}} 2D imaging sequence with spiral sampling of the k-space. ==Syntax== mri=spiral_pulse_sequence(spin_system,parameters,H,R,K,G,F) ==Descripti...") |
(sync with Spinach main 3975f139: spiral_frq is angular, rad/s) |
||
| (12 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
| − | {{DISPLAYTITLE:spiral | + | {{DISPLAYTITLE:spiral.m}} __NOTOC__ |
| − | 2D imaging sequence with spiral sampling | + | 2D imaging sequence with spiral k-space sampling; it must be called from the [[imaging.m]] context, which provides H,R,K,G, and F, and before Fourier transformation the spiral trajectory is resampled onto a square k-space grid. |
==Syntax== | ==Syntax== | ||
| Line 6: | Line 6: | ||
mri=spiral_pulse_sequence(spin_system,parameters,H,R,K,G,F) | mri=spiral_pulse_sequence(spin_system,parameters,H,R,K,G,F) | ||
| − | == | + | ==Parameters== |
| − | |||
| − | |||
| − | |||
parameters.t_echo - echo time, seconds | parameters.t_echo - echo time, seconds | ||
| − | parameters.spiral_frq - frequency of the spiral, | + | parameters.spiral_frq - angular frequency of the spiral, rad/s |
parameters.spiral_dur - duration of the spiral, seconds | parameters.spiral_dur - duration of the spiral, seconds | ||
| − | parameters. | + | parameters.grad_amp - gradient amplitude at the end |
of the spiral, T/m | of the spiral, T/m | ||
| Line 28: | Line 25: | ||
==Notes== | ==Notes== | ||
| − | Prior to being Fourier transformed, the spiral is resampled onto a suitable square grid - change the sequence to output | + | Prior to being Fourier transformed, the spiral is resampled onto a suitable square k-space grid - change the sequence to output spiral_kx, spiral_ky and spiral_z variables if you plan to process the data in a different way. |
==See also== | ==See also== | ||
| − | [[ | + | [[phase_enc_2d.m]], [[epi_2d.m]], [[fse.m]], [[imaging.m]], [[basic_1d_hard.m]], [[cpmg_dec.m]], [[epi_3d.m]], [[grad_echo.m]], [[phase_enc_3d.m]], [[press_1d.m]], [[press_2d.m]], [[press_voxel_1d.m]], [[press_voxel_2d.m]], [[press_voxel_3d.m]], [[slice_select_1d.m]], [[spin_echo.m]], [[udd_dec.m]], [[uhrig_times.m]], [[Built-in_experiments]], [[Imaging_module]], [[Mri_sequence_list]] |
| − | |||
''Version 2.1, authors: [[Ilya Kuprov]], [[Ahmed Allami]]'' | ''Version 2.1, authors: [[Ilya Kuprov]], [[Ahmed Allami]]'' | ||
Latest revision as of 10:58, 18 September 2026
2D imaging sequence with spiral k-space sampling; it must be called from the imaging.m context, which provides H,R,K,G, and F, and before Fourier transformation the spiral trajectory is resampled onto a square k-space grid.
Syntax
mri=spiral_pulse_sequence(spin_system,parameters,H,R,K,G,F)
Parameters
parameters.t_echo - echo time, seconds
parameters.spiral_frq - angular frequency of the spiral, rad/s
parameters.spiral_dur - duration of the spiral, seconds
parameters.grad_amp - gradient amplitude at the end
of the spiral, T/m
Outputs
mri - MRI image with square sinebell apodisation
Examples
See spiral_2d.m file in examples/imaging directory.
Notes
Prior to being Fourier transformed, the spiral is resampled onto a suitable square k-space grid - change the sequence to output spiral_kx, spiral_ky and spiral_z variables if you plan to process the data in a different way.
See also
phase_enc_2d.m, epi_2d.m, fse.m, imaging.m, basic_1d_hard.m, cpmg_dec.m, epi_3d.m, grad_echo.m, phase_enc_3d.m, press_1d.m, press_2d.m, press_voxel_1d.m, press_voxel_2d.m, press_voxel_3d.m, slice_select_1d.m, spin_echo.m, udd_dec.m, uhrig_times.m, Built-in_experiments, Imaging_module, Mri_sequence_list
Version 2.1, authors: Ilya Kuprov, Ahmed Allami
