b1-correction

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 — b1-correction [2020/06/15 11:53] (current) Line 1: Line 1: + ====== Correction of B1 inhomogeneity artifacts in CEST images ====== + {{ :b1_corr.png?direct&200|}} + Here you find a B1-correction algorithm as published in **Windschuh et al. (2015), NMR Biomed., 28(5):529-37.  [[http://onlinelibrary.wiley.com/doi/10.1002/nbm.3283/abstract|doi: 10.1002/nbm.3283]]**. + + Dowload zipped Matlab implementations [[https://github.com/cest-sources/B1_correction/archive/master.zip|here]] or find the package on [[https://github.com/cest-sources/B1_correction/]] + + ======  Tutorial ====== + There are two functions, **Z_B1_correction** and **contrast_B1_correction**, which both require data of several CEST acquisitions with different B1. Both reconstruct either Z-spectrum stacks or contrast stacks at the B1 values given by **B1_output**. + + + function [Z_stack_corr] = Z_B1_correction(Z_stack,rel_B1map,B1_input,B1_output,SEGMENT,fit_type,B1_input_index) + % [Z_stack_corr] = Z_B1_correction(Z_stack,rel_B1map,SEGMENT_2D,B1_input,fit_type,B1_input_index,B1_output) + % output: B1 corrected Z-stack (5D-stack) + % input:    Z_stack = 5D-stack of Z-spectra (y,x,z,offset,B1) + %           rel_B1map = relative B1map + %           B1_output = output B1 (scalar or vector) + %           SEGMENT = voxel/pixel mask for evaluation + %           fit_type = fit or interpolation type + %           B1_input_index = index vector of B1 samples that should be used + %           for correction + % + + + + function [corr_img]=contrast_B1_correction(img,rel_B1map,B1_input,B1_output,SEGMENT_2D,fit_type,B1_input_index) + % [corr_img]=contrast_B1_correction(img,rel_B1map,B1_input,B1_output,SEGMENT_2D,fit_type,B1_input_index) + % output: B1 corrected images (2D or 3D-stack) (x,y,B1) + % input:    img = 3D-stack of images (x,y,B1) which are used for B1-correciton + %           rel_B1map = relative B1map + %           B1_output = output B1 (scalar or vector) + %           SEGMENT_2D = pixel mask for evaluation + %           fit_type = fit or interpolation type + %           B1_input_index = index vector of B1 samples that should be used + %           for correction + + {{ :logo_dkfz.png?direct&180|powered by DKFZ}} 