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biac:analysis:topup_correction
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biac:analysis:topup_correction [2021/08/24 18:22] cmp12 |
biac:analysis:topup_correction [2021/08/24 18:23] cmp12 |
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| You need to calculate readout time in seconds of the PEPOLAR images ( the physical time it takes to get the acquisition matrix of a single slice ) and get the polarity direction ( phase encode direction ). | You need to calculate readout time in seconds of the PEPOLAR images ( the physical time it takes to get the acquisition matrix of a single slice ) and get the polarity direction ( phase encode direction ). | ||
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| the readout time in seconds for the parameter file will be: | the readout time in seconds for the parameter file will be: | ||
| - | < | ||
| **For singleband images :** | **For singleband images :** | ||
| + | < | ||
| readout = (echospacing * (acquisitionmatrix[0] * (percentsampling/ | readout = (echospacing * (acquisitionmatrix[0] * (percentsampling/ | ||
| echospacing in the BXH header is in microseconds | echospacing in the BXH header is in microseconds | ||
| + | < | ||
| **For mutli-band images the readout calculation is more complex: | **For mutli-band images the readout calculation is more complex: | ||
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| readout = ( ( ceil ((1/ | readout = ( ( ceil ((1/ | ||
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| 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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| </ | </ | ||
biac/analysis/topup_correction.txt · Last modified: 2023/02/23 18:43 (external edit)
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