/**
* construct
*/
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);
}
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);
}