00001 #include <stdlib.h>
00002 #include <math.h>
00003 #include <limits.h>
00004
00005 #include "nfft3.h"
00006 #include "util.h"
00007
00017 void construct(char * file, int N, int M)
00018 {
00019 int j;
00020 double real;
00021 double w;
00022 double time,min_time,max_time,min_inh,max_inh;
00023 mri_inh_2d1d_plan my_plan;
00024 FILE *fp,*fout,*fi,*finh,*ftime;
00025 int my_N[3],my_n[3];
00026 int flags = PRE_PHI_HUT| PRE_PSI |MALLOC_X| MALLOC_F_HAT|
00027 MALLOC_F| FFTW_INIT| FFT_OUT_OF_PLACE|
00028 FFTW_MEASURE| FFTW_DESTROY_INPUT;
00029
00030 double Ts;
00031 double W,T;
00032 int N3;
00033 int m=2;
00034 double sigma = 1.25;
00035
00036 ftime=fopen("readout_time.dat","r");
00037 finh=fopen("inh.dat","r");
00038
00039 min_time=INT_MAX; max_time=INT_MIN;
00040 for(j=0;j<M;j++)
00041 {
00042 fscanf(ftime,"%le ",&time);
00043 if(time<min_time)
00044 min_time = time;
00045 if(time>max_time)
00046 max_time = time;
00047 }
00048
00049 fclose(ftime);
00050
00051 Ts=(min_time+max_time)/2.0;
00052
00053 min_inh=INT_MAX; max_inh=INT_MIN;
00054 for(j=0;j<N*N;j++)
00055 {
00056 fscanf(finh,"%le ",&w);
00057 if(w<min_inh)
00058 min_inh = w;
00059 if(w>max_inh)
00060 max_inh = w;
00061 }
00062 fclose(finh);
00063
00064
00065 N3=ceil((NFFT_MAX(fabs(min_inh),fabs(max_inh))*(max_time-min_time)/2.0+m/(2*sigma))*4*sigma);
00066 T=((max_time-min_time)/2.0)/(0.5-((double) m)/N3);
00067 W=N3/T;
00068
00069 my_N[0]=N; my_n[0]=ceil(N*sigma);
00070 my_N[1]=N; my_n[1]=ceil(N*sigma);
00071 my_N[2]=N3; my_n[2]=N3;
00072
00073
00074 mri_inh_2d1d_init_guru(&my_plan, my_N, M, my_n, m, sigma, flags,
00075 FFTW_MEASURE| FFTW_DESTROY_INPUT);
00076
00077 ftime=fopen("readout_time.dat","r");
00078 fp=fopen("knots.dat","r");
00079
00080 for(j=0;j<my_plan.M_total;j++)
00081 {
00082 fscanf(fp,"%le %le ",&my_plan.plan.x[2*j+0],&my_plan.plan.x[2*j+1]);
00083 fscanf(ftime,"%le ",&my_plan.t[j]);
00084 my_plan.t[j] = (my_plan.t[j]-Ts)/T;
00085 }
00086 fclose(fp);
00087 fclose(ftime);
00088
00089 finh=fopen("inh.dat","r");
00090 for(j=0;j<N*N;j++)
00091 {
00092 fscanf(finh,"%le ",&my_plan.w[j]);
00093 my_plan.w[j]/=W;
00094 }
00095 fclose(finh);
00096
00097
00098 fi=fopen("input_f.dat","r");
00099 for(j=0;j<N*N;j++)
00100 {
00101 fscanf(fi,"%le ",&real);
00102 my_plan.f_hat[j] = real*cexp(2.0*I*PI*Ts*my_plan.w[j]*W);
00103 }
00104
00105 if(my_plan.plan.nfft_flags & PRE_PSI)
00106 nfft_precompute_psi(&my_plan.plan);
00107
00108 mri_inh_2d1d_trafo(&my_plan);
00109
00110 fout=fopen(file,"w");
00111
00112 for(j=0;j<my_plan.M_total;j++)
00113 {
00114 fprintf(fout,"%le %le %le %le\n",my_plan.plan.x[2*j+0],my_plan.plan.x[2*j+1],creal(my_plan.f[j]),cimag(my_plan.f[j]));
00115 }
00116
00117 fclose(fout);
00118
00119 mri_inh_2d1d_finalize(&my_plan);
00120 }
00121
00122 int main(int argc, char **argv)
00123 {
00124 if (argc <= 3) {
00125 printf("usage: ./construct_data_inh_2d1d FILENAME N M\n");
00126 return 1;
00127 }
00128
00129 construct(argv[1],atoi(argv[2]),atoi(argv[3]));
00130
00131 return 1;
00132 }
00133
