reconstruct_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 <stdlib.h>
#include <math.h>
#include <limits.h>
#include <complex.h>
#include "nfft3.h"
#ifndef MAX
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif
static void reconstruct(char* filename,int N,int M,int iteration , int weight)
{
int j,k,l;
double t0, t1;
double time,min_time,max_time,min_inh,max_inh;
double t,real,imag;
double w,epsilon=0.0000003; /* epsilon is a the break criterium for
the iteration */;
mri_inh_3d_plan my_plan;
solver_plan_complex my_iplan;
FILE* fp,*fw,*fout_real,*fout_imag,*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;
unsigned infft_flags = CGNR | PRECOMPUTE_DAMP;
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);
/* N3 has to be even */
if(N3%2!=0)
N3++;
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);
if (weight)
infft_flags = infft_flags | PRECOMPUTE_WEIGHT;
/* initialise my_iplan, advanced */
solver_init_advanced_complex(&my_iplan,(nfft_mv_plan_complex*)(&my_plan), infft_flags );
/* get the weights */
if(my_iplan.flags & PRECOMPUTE_WEIGHT)
{
fw=fopen("weights.dat","r");
for(j=0;j<my_plan.M_total;j++)
{
fscanf(fw,"%le ",&my_iplan.w[j]);
}
fclose(fw);
}
/* get the damping factors */
if(my_iplan.flags & PRECOMPUTE_DAMP)
{
for(j=0;j<N;j++){
for(k=0;k<N;k++) {
int j2= j-N/2;
int k2= k-N/2;
double r=sqrt(j2*j2+k2*k2);
if(r>(double) N/2)
my_iplan.w_hat[j*N+k]=0.0;
else
my_iplan.w_hat[j*N+k]=1.0;
}
}
}
fp=fopen(filename,"r");
ftime=fopen("readout_time.dat","r");
for(j=0;j<my_plan.M_total;j++)
{
fscanf(fp,"%le %le %le %le",&my_plan.plan.x[3*j+0],&my_plan.plan.x[3*j+1],&real,&imag);
my_iplan.y[j]=real+ _Complex_I*imag;
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);
if(my_plan.plan.flags & PRE_PSI) {
nfft_precompute_psi(&my_plan.plan);
}
if(my_plan.plan.flags & PRE_FULL_PSI) {
nfft_precompute_full_psi(&my_plan.plan);
}
/* init some guess */
for(j=0;j<my_plan.N_total;j++)
{
my_iplan.f_hat_iter[j]=0.0;
}
t0 = nfft_clock_gettime_seconds();
/* inverse trafo */
solver_before_loop_complex(&my_iplan);
for(l=0;l<iteration;l++)
{
/* break if dot_r_iter is smaller than epsilon*/
if(my_iplan.dot_r_iter<epsilon)
break;
fprintf(stderr,"%e, %i of %i\n",sqrt(my_iplan.dot_r_iter),
l+1,iteration);
solver_loop_one_step_complex(&my_iplan);
}
t1 = nfft_clock_gettime_seconds();
t = t1-t0;
fout_real=fopen("output_real.dat","w");
fout_imag=fopen("output_imag.dat","w");
for (j=0;j<N*N;j++) {
/* Verschiebung wieder herausrechnen */
my_iplan.f_hat_iter[j]*=cexp(-2.0*_Complex_I*M_PI*Ts*my_plan.w[j]*W);
fprintf(fout_real,"%le ",creal(my_iplan.f_hat_iter[j]));
fprintf(fout_imag,"%le ",cimag(my_iplan.f_hat_iter[j]));
}
fclose(fout_real);
fclose(fout_imag);
solver_finalize_complex(&my_iplan);
mri_inh_3d_finalize(&my_plan);
}
int main(int argc, char **argv)
{
if (argc <= 5) {
printf("usage: ./reconstruct_data_inh_3d FILENAME N M ITER WEIGHTS\n");
return 1;
}
reconstruct(argv[1],atoi(argv[2]),atoi(argv[3]),atoi(argv[4]),atoi(argv[5]));
return 1;
}
/* \} */
PRECOMPUTE_DAMP
#define PRECOMPUTE_DAMP
Definition: nfft3.h:790
MALLOC_X
#define MALLOC_X
Definition: nfft3.h:199
MALLOC_F_HAT
#define MALLOC_F_HAT
Definition: nfft3.h:200
PRECOMPUTE_WEIGHT
#define PRECOMPUTE_WEIGHT
Definition: nfft3.h:789
solver_plan_complex::w
double * w
weighting factors
Definition: nfft3.h:783
solver_plan_complex::flags
unsigned flags
iteration type
Definition: nfft3.h:783
solver_plan_complex::dot_r_iter
double dot_r_iter
weighted dotproduct of r_iter
Definition: nfft3.h:783
nfft_precompute_full_psi
void nfft_precompute_full_psi(nfft_plan *ths)
mri_inh_3d_plan::N_total
NFFT_INT N_total
Total number of Fourier coefficients.
Definition: nfft3.h:525
nfft_precompute_psi
void nfft_precompute_psi(nfft_plan *ths)
nfft_mv_plan_complex
Definition: nfft3.h:192
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
CGNR
#define CGNR
Definition: nfft3.h:786
mri_inh_3d_plan
Definition: nfft3.h:525
solver_plan_complex::y
fftw_complex * y
right hand side, samples
Definition: nfft3.h:783
PRE_FULL_PSI
#define PRE_FULL_PSI
Definition: nfft3.h:198
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
solver_plan_complex
data structure for an inverse NFFT plan with double precision
Definition: nfft3.h:783
solver_plan_complex::w_hat
double * w_hat
damping factors
Definition: nfft3.h:783
solver_plan_complex::f_hat_iter
fftw_complex * f_hat_iter
iterative solution
Definition: nfft3.h:783