/** * 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); }