% mexGetSamplesFromSPFCoefficients: get DWI or EAP samples (orignal samples or the SH coefficients) from given SPF coefficients
%
% Usage:
% [samples] = mexGetSamplesFromSPFCoefficients(spfCoef4D, radius, params)
% [samples] = mexGetSamplesFromSPFCoefficients(spfCoef4D, radiusVec, grad, params)
%
% Inputs:
% dwi4DNoramlized: 4D DWI data, normalized by b0 image;
% grad : orientation matrix where each row is an orientation (x,y,z), caresian format.
% If it is not given, then return SH coefficients instead of orignal samples.
% radiusVector: b values in a vector, or r values. If it is set, the number of rows should be the same as grad
% radius: b value or r value.
%
% params.MD0 : Typical mean diffusivity (MD) value. The default value is 0.7e-3.
% params.tau : Tau value. The default is calculated based on 4*pi*pi*tau=1.
% param.scale : Scale value for the SPF basis in radial part, the default value is set by tau and MD0 and tau
% params.sh : SH order
% params.ra : order in radial part
% params.fourier : Use Fourier transform.
% params.inqspace : If it is true, the basis is in q-space (default). If it is false, the basis is in r-space.
% params.mdImage : Mean diffusivity Image for adaptive scale.
% params.basisType : SPF: use SPF basis (default).
% params.mask : Mask file. 2D or 3D matrix.
%
% params.thread : Number of thread. Default is -1, which means it is automatically determined.
% params.verbose : Verbose level. 0: no output log. 1: normal log. 2: large log for debug.
%
% Outputs:
% isoDWI: each column is a dwi sample
%
%
% Reference:
% 1. "Model-Free, Regularized, Fast, and Robust Analytical Orientation Distribution Function Estimation",
% Jian Cheng, Aurobrata Ghosh, Rachid Deriche, Tianzi Jiang, Medical Image Computing and Computer-Assisted Intervention (MICCAI'10), vol. 6361, pp. 648–656, sep, 2010.
% 2. "Model-free and Analytical EAP Reconstruction via Spherical Polar Fourier Diffusion MRI",
% Jian Cheng, Aurobrata Ghosh, Tianzi Jiang, Rachid Deriche, Medical Image Computing and Computer-Assisted Intervention (MICCAI'10), vol. 6361, pp. 590–597, sep, 2010.
%
% Copyright (c) 2013, Jian Cheng <jian.cheng.1983@gmail.com>
%
