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biac:analysis:topup_correction [2021/08/24 18:23] cmp12 |
biac:analysis:topup_correction [2021/08/24 18:29] cmp12 |
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echospacing in the BXH header is in microseconds | echospacing in the BXH header is in microseconds | ||
- | < | + | </code> |
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< | < | ||
readout = ( ( ceil ((1/ | readout = ( ( ceil ((1/ | ||
- | |||
- | EffectiveEchoSpacing = TotalReadoutTime/ | ||
AcquisitionMatrixPE = the acquisition size of the data ( acquisitionmatrix[0] ) | AcquisitionMatrixPE = the acquisition size of the data ( acquisitionmatrix[0] ) | ||
- | reconMatrixPE = the size of the reconstructed data ( may be different from acquisition because of FFT rules ) | ||
Round_factor = 4 if partial fourier ( PFF is in scanoptions ), 2 if full fourier. | Round_factor = 4 if partial fourier ( PFF is in scanoptions ), 2 if full fourier. | ||
Asset_R_factor = the reciprocal of the first value of dcm tag (0043,1083) | Asset_R_factor = the reciprocal of the first value of dcm tag (0043,1083) | ||
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==== Create your acq_params.txt file === | ==== Create your acq_params.txt file === | ||
- | the readout time in seconds for the parameter file will be: | + | calculate your readout time from above |
- | < | + | |
- | + | ||
- | echospacing in BXH header is in microseconds | + | |
- | </ | + | |
the regular B0s will get the " | the regular B0s will get the " | ||
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If you are running dwidenoise, do it BEFORE dwipreproc. | If you are running dwidenoise, do it BEFORE dwipreproc. | ||
- | ==== Calculate your readout time ==== | + | ==== Calculate your readout time as mentioned above ==== |
- | < | + | |
- | + | ||
- | echospacing in BXH header is in microseconds | + | |
- | </ | + | |
==== Prepare your input datasets ==== | ==== Prepare your input datasets ==== |