construct_data_inh_3d.c
/*
* Copyright (c) 2002, 2017 Jens Keiner, Stefan Kunis, Daniel Potts
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <math.h>
#include <limits.h>
#ifdef HAVE_COMPLEX_H
#include <complex.h>
#endif
#include "nfft3.h"
#ifndef MAX
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif
static void construct(char * file, int N, int M)
{
int j; /* some variables */
double real;
double w;
double time,min_time,max_time,min_inh,max_inh;
mri_inh_3d_plan my_plan;
FILE *fp,*fout,*fi,*finh,*ftime;
int my_N[3],my_n[3];
int flags = PRE_PHI_HUT| PRE_PSI |MALLOC_X| MALLOC_F_HAT|
MALLOC_F| FFTW_INIT| FFT_OUT_OF_PLACE|
FFTW_MEASURE| FFTW_DESTROY_INPUT;
double Ts;
double W;
int N3;
int m=2;
double sigma = 1.25;
ftime=fopen("readout_time.dat","r");
finh=fopen("inh.dat","r");
min_time=INT_MAX; max_time=INT_MIN;
for(j=0;j<M;j++)
{
fscanf(ftime,"%le ",&time);
if(time<min_time)
min_time = time;
if(time>max_time)
max_time = time;
}
fclose(ftime);
Ts=(min_time+max_time)/2.0;
min_inh=INT_MAX; max_inh=INT_MIN;
for(j=0;j<N*N;j++)
{
fscanf(finh,"%le ",&w);
if(w<min_inh)
min_inh = w;
if(w>max_inh)
max_inh = w;
}
fclose(finh);
N3=ceil((MAX(fabs(min_inh),fabs(max_inh))*(max_time-min_time)/2.0+m/(2*sigma))*4*sigma);
W= MAX(fabs(min_inh),fabs(max_inh))/(0.5-((double)m)/N3);
my_N[0]=N; my_n[0]=ceil(N*sigma);
my_N[1]=N; my_n[1]=ceil(N*sigma);
my_N[2]=N3; my_n[2]=ceil(N3*sigma);
/* initialise nfft */
mri_inh_3d_init_guru(&my_plan, my_N, M, my_n, m, sigma, flags,
FFTW_MEASURE| FFTW_DESTROY_INPUT);
ftime=fopen("readout_time.dat","r");
fp=fopen("knots.dat","r");
for(j=0;j<my_plan.M_total;j++)
{
fscanf(fp,"%le %le",&my_plan.plan.x[3*j+0],&my_plan.plan.x[3*j+1]);
fscanf(ftime,"%le ",&my_plan.plan.x[3*j+2]);
my_plan.plan.x[3*j+2] = (my_plan.plan.x[3*j+2]-Ts)*W/N3;
}
fclose(fp);
fclose(ftime);
finh=fopen("inh.dat","r");
for(j=0;j<N*N;j++)
{
fscanf(finh,"%le ",&my_plan.w[j]);
my_plan.w[j]/=W;
}
fclose(finh);
fi=fopen("input_f.dat","r");
for(j=0;j<N*N;j++)
{
fscanf(fi,"%le ",&real);
my_plan.f_hat[j] = real*cexp(2.0*_Complex_I*M_PI*Ts*my_plan.w[j]*W);
}
if(my_plan.plan.flags & PRE_PSI)
nfft_precompute_psi(&my_plan.plan);
mri_inh_3d_trafo(&my_plan);
fout=fopen(file,"w");
for(j=0;j<my_plan.M_total;j++)
{
fprintf(fout,"%le %le %le %le\n",my_plan.plan.x[3*j+0],my_plan.plan.x[3*j+1],creal(my_plan.f[j]),cimag(my_plan.f[j]));
}
fclose(fout);
mri_inh_3d_finalize(&my_plan);
}
int main(int argc, char **argv)
{
if (argc <= 3) {
printf("usage: ./construct_data_inh_3d FILENAME N M\n");
return 1;
}
construct(argv[1],atoi(argv[2]),atoi(argv[3]));
return 1;
}
/* \} */
MALLOC_X
#define MALLOC_X
Definition: nfft3.h:199
MALLOC_F_HAT
#define MALLOC_F_HAT
Definition: nfft3.h:200
mri_inh_3d_trafo
void mri_inh_3d_trafo(mri_inh_3d_plan *ths)
Definition: mri.c:189
mri_inh_3d_plan::f_hat
fftw_complex * f_hat
Fourier coefficients.
Definition: nfft3.h:525
mri_inh_3d_plan::f
fftw_complex * f
Samples.
Definition: nfft3.h:525
construct
static void construct(char *file, int N, int M)
construct
Definition: construct_data_inh_3d.c:42
nfft_precompute_psi
void nfft_precompute_psi(nfft_plan *ths)
FFTW_INIT
#define FFTW_INIT
Definition: nfft3.h:203
mri_inh_3d_plan::M_total
NFFT_INT M_total
Total number of samples.
Definition: nfft3.h:525
MALLOC_F
#define MALLOC_F
Definition: nfft3.h:201
FFT_OUT_OF_PLACE
#define FFT_OUT_OF_PLACE
Definition: nfft3.h:202
PRE_PSI
#define PRE_PSI
Definition: nfft3.h:197
mri_inh_3d_plan
Definition: nfft3.h:525
nfft3.h
Header file for the nfft3 library.
nfft_plan::x
double * x
Nodes in time/spatial domain, size is doubles.
Definition: nfft3.h:192
PRE_PHI_HUT
#define PRE_PHI_HUT
Definition: nfft3.h:193
mri_inh_3d_finalize
void mri_inh_3d_finalize(mri_inh_3d_plan *ths)
Definition: mri.c:266
nfft_plan::flags
unsigned flags
Flags for precomputation, (de)allocation, and FFTW usage, default setting is PRE_PHI_HUT | PRE_PSI | ...
Definition: nfft3.h:192