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rfprof.c
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rfprof.c
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/*
Reads rf inhomogeneity files
Copyright (C) 2007 Zdenek Tosner
This file is part of the SIMPSON General NMR Simulation Package
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
The rf inhomogeneity file must have the following data format:
<N> <M>
<scalefactor1 chan1> <scalefactor1 chan2> ... <weight1>
<scalefactor2 chan1> <scalefactor2 chan2> ... <weight2>
<scalefactor3 chan1> <scalefactor3 chan2> ... <weight3>
...
<scalefactorN chan1> <scalefactorN chan2> ... <weightN>
where <N> is the number of rf isochromats, <M> is the number of rf channels (is
M is set to 1 the same profile is assumed on all channels), scalefactor is the
rf scale factor typically ranging from 0 to 2 (nominal field = 1).
Weight is relative occurance of the isochromat; sum of all weights doesn't need
to sum up to 1, program takes care of that...
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "matrix.h"
#include "defs.h"
#include "rfprof.h"
/****
* alocate rfprof structure
****/
double ** rfprof_alloc(int N, int chan)
{
int i;
double ** obj=NULL;
obj = (double**)malloc((N+1)*sizeof(double*));
obj[0] = (double*)malloc(sizeof(double));
*(int*)(obj[0]) = N;
//obj[0][0] = (double)N;
//*((int*)*obj) = N;
for (i=1;i<=N; i++) {
obj[i] = double_vector(chan+1);
}
return obj;
}
/*
* rfprof structure length
*/
int rfprof_len(double ** obj){
//return *((int*)*obj);
//return (int)(obj[0][0]);
return *(int*)(obj[0]);
}
/*
* free rfprof structure
*/
void rfprof_free(double ** obj)
{
int i, N;
N = rfprof_len(obj);
for (i=1; i<=N; i++) {
free_double_vector(obj[i]);
}
free(obj[0]);
free(obj);
}
/****
* ZT: reads in rf profile from a file
****/
double ** read_rfproffile(const char* name,int nchan)
{
FILE* fp;
char fname[256];
int N,i,j,M;
int ver;
double dum, **data;
ver= verbose & VERBOSE_RFPROF;
strcpy(fname,name);
if (!strcmp(fname,"none")) {
data = rfprof_alloc(1, nchan);
for (i=1; i<=nchan+1; i++) {
data[1][i]=1.0;
}
return data;
}
#ifdef UNIX
if (name[0] == '~') {
char* p=getenv("HOME");
if (p != NULL) {
strcpy(fname,p);
strcat(fname,&name[1]);
}
}
#endif
if (!(fp=fopen(fname,"r"))) {
strcat(fname,".rf");
fp=fopen(fname,"r");
}
if (!fp) {
fprintf(stderr,"error: unable to open file '%s'\n",fname);
fprintf(stderr,"\n");
exit(1);
}
if (ver) printf("loading external rf profile file '%s'\n",fname);
if (fscanf(fp,"%d%d",&N,&M) != 2) {
fprintf(stderr,"unable to read rf profile structure data from file '%s'\n",fname);
exit(1);
}
data = rfprof_alloc(N,nchan);
for (i=1;i<=N;i++) {
for (j=1;j<=M;j++) {
if (fscanf(fp,"%lg",&dum) != 1) {
fprintf(stderr,"error: unable to read line %d, column %d in file %s\n",i,j,fname);
exit(1);
}
data[i][j] = dum;
}
for (j=M+1; j<=nchan; j++) {
data[i][j] = 1.0;
}
if (fscanf(fp,"%lg",&dum) != 1) {
fprintf(stderr,"error: unable to read weight on line %d in file %s\n",i,fname);
exit(1);
}
if (dum == 0.0) {
fprintf(stderr,"error: rf isochromat number %d in file '%s' has zero weight\n",i,name);
exit(1);
}
data[i][nchan+1] = dum;
}
fclose(fp);
if (ver) {
for (i=1; i<=N; i++) {
printf("%5d ",i);
for (j=1; j<=nchan+1; j++)
printf("%15g ",data[i][j]);
printf("\n");
}
}
return data;
}
double rfprof_sumweight(double **rfdata)
{
double w=0.0;
int i, N, NN;
N = rfprof_len(rfdata);
DEBUGPRINT("rfprof_sumweight: rfdata length = %d\n",N);
NN = LEN(rfdata[1]);
for (i=1; i<=N; i++)
w += rfdata[i][NN];
return w;
}