00001 #include <stdlib.h>
00002 #include <math.h>
00003 #include <limits.h>
00004 #include "nfft3.h"
00005 #include "util.h"
00006
00016 void construct(char * file, int N, int M)
00017 {
00018 int j;
00019 double real;
00020 double w;
00021 double time,min_time,max_time,min_inh,max_inh;
00022 mri_inh_3d_plan my_plan;
00023 FILE *fp,*fout,*fi,*finh,*ftime;
00024 int my_N[3],my_n[3];
00025 int flags = PRE_PHI_HUT| PRE_PSI |MALLOC_X| MALLOC_F_HAT|
00026 MALLOC_F| FFTW_INIT| FFT_OUT_OF_PLACE|
00027 FFTW_MEASURE| FFTW_DESTROY_INPUT;
00028
00029 double Ts;
00030 double W;
00031 int N3;
00032 int m=2;
00033 double sigma = 1.25;
00034
00035 ftime=fopen("readout_time.dat","r");
00036 finh=fopen("inh.dat","r");
00037
00038 min_time=INT_MAX; max_time=INT_MIN;
00039 for(j=0;j<M;j++)
00040 {
00041 fscanf(ftime,"%le ",&time);
00042 if(time<min_time)
00043 min_time = time;
00044 if(time>max_time)
00045 max_time = time;
00046 }
00047
00048 fclose(ftime);
00049
00050 Ts=(min_time+max_time)/2.0;
00051
00052 min_inh=INT_MAX; max_inh=INT_MIN;
00053 for(j=0;j<N*N;j++)
00054 {
00055 fscanf(finh,"%le ",&w);
00056 if(w<min_inh)
00057 min_inh = w;
00058 if(w>max_inh)
00059 max_inh = w;
00060 }
00061 fclose(finh);
00062
00063 N3=ceil((NFFT_MAX(fabs(min_inh),fabs(max_inh))*(max_time-min_time)/2.0+m/(2*sigma))*4*sigma);
00064
00065 W= NFFT_MAX(fabs(min_inh),fabs(max_inh))/(0.5-((double)m)/N3);
00066
00067 my_N[0]=N; my_n[0]=ceil(N*sigma);
00068 my_N[1]=N; my_n[1]=ceil(N*sigma);
00069 my_N[2]=N3; my_n[2]=ceil(N3*sigma);
00070
00071
00072 mri_inh_3d_init_guru(&my_plan, my_N, M, my_n, m, sigma, flags,
00073 FFTW_MEASURE| FFTW_DESTROY_INPUT);
00074
00075 ftime=fopen("readout_time.dat","r");
00076 fp=fopen("knots.dat","r");
00077
00078 for(j=0;j<my_plan.M_total;j++)
00079 {
00080 fscanf(fp,"%le %le",&my_plan.plan.x[3*j+0],&my_plan.plan.x[3*j+1]);
00081 fscanf(ftime,"%le ",&my_plan.plan.x[3*j+2]);
00082 my_plan.plan.x[3*j+2] = (my_plan.plan.x[3*j+2]-Ts)*W/N3;
00083 }
00084 fclose(fp);
00085 fclose(ftime);
00086
00087 finh=fopen("inh.dat","r");
00088 for(j=0;j<N*N;j++)
00089 {
00090 fscanf(finh,"%le ",&my_plan.w[j]);
00091 my_plan.w[j]/=W;
00092 }
00093 fclose(finh);
00094
00095
00096 fi=fopen("input_f.dat","r");
00097 for(j=0;j<N*N;j++)
00098 {
00099 fscanf(fi,"%le ",&real);
00100 my_plan.f_hat[j] = real*cexp(2.0*I*PI*Ts*my_plan.w[j]*W);
00101 }
00102
00103 if(my_plan.plan.nfft_flags & PRE_PSI)
00104 nfft_precompute_psi(&my_plan.plan);
00105
00106 mri_inh_3d_trafo(&my_plan);
00107
00108 fout=fopen(file,"w");
00109
00110 for(j=0;j<my_plan.M_total;j++)
00111 {
00112 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]));
00113 }
00114
00115 fclose(fout);
00116
00117 mri_inh_3d_finalize(&my_plan);
00118 }
00119
00120 int main(int argc, char **argv)
00121 {
00122 if (argc <= 3) {
00123 printf("usage: ./construct_data_inh_3d FILENAME N M\n");
00124 return 1;
00125 }
00126
00127 construct(argv[1],atoi(argv[2]),atoi(argv[3]));
00128
00129 return 1;
00130 }
00131
