26 #define MAX(a,b) (((a)>(b))?(a):(b))
35 static void reconstruct(
char* filename,
int N,
int M,
int iteration ,
int weight)
39 double time,min_time,max_time,min_inh,max_inh;
41 double w,epsilon=0.0000003;
45 FILE* fp,*fw,*fout_real,*fout_imag,*finh,*ftime;
57 ftime=fopen(
"readout_time.dat",
"r");
58 finh=fopen(
"inh.dat",
"r");
60 min_time=INT_MAX; max_time=INT_MIN;
63 fscanf(ftime,
"%le ",&time);
72 Ts=(min_time+max_time)/2.0;
75 min_inh=INT_MAX; max_inh=INT_MIN;
78 fscanf(finh,
"%le ",&w);
86 N3=ceil((MAX(fabs(min_inh),fabs(max_inh))*(max_time-min_time)/2.0+m/(2*sigma))*4*sigma);
91 W= MAX(fabs(min_inh),fabs(max_inh))/(0.5-((double) m)/N3);
93 my_N[0]=N;my_n[0]=ceil(N*sigma);
94 my_N[1]=N; my_n[1]=ceil(N*sigma);
95 my_N[2]=N3; my_n[2]=ceil(N3*sigma);
98 mri_inh_3d_init_guru(&my_plan, my_N, M, my_n, m, sigma, flags,
99 FFTW_MEASURE| FFTW_DESTROY_INPUT);
110 fw=fopen(
"weights.dat",
"r");
113 fscanf(fw,
"%le ",&my_iplan.
w[j]);
125 double r=sqrt(j2*j2+k2*k2);
127 my_iplan.
w_hat[j*N+k]=0.0;
129 my_iplan.
w_hat[j*N+k]=1.0;
134 fp=fopen(filename,
"r");
135 ftime=fopen(
"readout_time.dat",
"r");
139 fscanf(fp,
"%le %le %le %le",&my_plan.plan.
x[3*j+0],&my_plan.plan.
x[3*j+1],&real,&imag);
140 my_iplan.
y[j]=real+ _Complex_I*imag;
141 fscanf(ftime,
"%le ",&my_plan.plan.
x[3*j+2]);
143 my_plan.plan.
x[3*j+2] = (my_plan.plan.
x[3*j+2]-Ts)*W/N3;
149 finh=fopen(
"inh.dat",
"r");
152 fscanf(finh,
"%le ",&my_plan.w[j]);
171 t0 = nfft_clock_gettime_seconds();
174 solver_before_loop_complex(&my_iplan);
175 for(l=0;l<iteration;l++)
180 fprintf(stderr,
"%e, %i of %i\n",sqrt(my_iplan.
dot_r_iter),
182 solver_loop_one_step_complex(&my_iplan);
185 t1 = nfft_clock_gettime_seconds();
188 fout_real=fopen(
"output_real.dat",
"w");
189 fout_imag=fopen(
"output_imag.dat",
"w");
191 for (j=0;j<N*N;j++) {
193 my_iplan.
f_hat_iter[j]*=cexp(-2.0*_Complex_I*M_PI*Ts*my_plan.w[j]*W);
195 fprintf(fout_real,
"%le ",creal(my_iplan.
f_hat_iter[j]));
196 fprintf(fout_imag,
"%le ",cimag(my_iplan.
f_hat_iter[j]));
201 solver_finalize_complex(&my_iplan);
206 int main(
int argc,
char **argv)
210 printf(
"usage: ./reconstruct_data_inh_3d FILENAME N M ITER WEIGHTS\n");
214 reconstruct(argv[1],atoi(argv[2]),atoi(argv[3]),atoi(argv[4]),atoi(argv[5]));
#define PRECOMPUTE_WEIGHT
double * w
weighting factors
unsigned flags
iteration type
double dot_r_iter
weighted dotproduct of r_iter
void nfft_precompute_full_psi(nfft_plan *ths)
NFFT_INT N_total
Total number of Fourier coefficients.
void nfft_precompute_psi(nfft_plan *ths)
NFFT_INT M_total
Total number of samples.
fftw_complex * y
right hand side, samples
Header file for the nfft3 library.
double * x
Nodes in time/spatial domain, size is doubles.
void mri_inh_3d_finalize(mri_inh_3d_plan *ths)
unsigned flags
Flags for precomputation, (de)allocation, and FFTW usage, default setting is PRE_PHI_HUT | PRE_PSI | ...
data structure for an inverse NFFT plan with double precision
double * w_hat
damping factors
fftw_complex * f_hat_iter
iterative solution