img_sif.c

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/******************************************************************************/
#include "libtpcimgio.h"
/******************************************************************************/
 
/******************************************************************************/
int sif2img(
  SIF *sif,
  IMG *img,
  int copy_header,
  int copy_frames,
  int copy_counts,
  int verbose
) {
  if(verbose>0)
    printf("sif2img(sif, img, %d, %d, %d, ...)\n", copy_header, copy_frames, copy_counts);
  if(img==NULL || sif==NULL) return 1;
 
  if(copy_header) {
    if(verbose>1) printf("  copying header.\n");
    img->scanStart=sif->scantime;
    img->isotopeHalflife=60.0*hlFromIsotope(sif->isotope_name);
    if(strlen(sif->studynr)>0 && strcmp(sif->studynr, ".")!=0)
      strlcpy(img->studyNr, sif->studynr, MAX_STUDYNR_LEN+1);
    else
      strcpy(img->studyNr, "");
  }
 
  if(copy_frames) {
    if(verbose>1) printf("  copying frame times.\n");
    if(sif->frameNr!=img->dimt) return(3);
    for(int fi=0; fi<img->dimt; fi++) {
      img->start[fi]=sif->x1[fi];
      img->end[fi]=sif->x2[fi];
      img->mid[fi]=0.5*(img->start[fi]+img->end[fi]);
    }
  }
 
  if(copy_counts) {
    if(verbose>1) printf("  copying count data.\n");
    if(sif->frameNr!=img->dimt) return(3);
    if(sif->colNr<4) return(4);
    for(int fi=0; fi<img->dimt; fi++) {
      img->prompts[fi]=sif->prompts[fi];
      img->randoms[fi]=sif->randoms[fi];
      img->weight[fi]=sif->weights[fi];
    }
  }
 
  return 0;
}
/*****************************************************************************/
 
/*****************************************************************************/
int img2sif(
  IMG *img,
  SIF *sif,
  int copy_header,
  int copy_frames,
  int copy_counts,
  int verbose
) {
  if(verbose>0)
    printf("img2sif(img, sif, %d, %d, %d, ...)\n", copy_header, copy_frames, copy_counts);
 
  /* Check the arguments */
  if(img==NULL || sif==NULL) return(1);
  if(img->dimt<1) return(1);
 
  /* Verify that IMG contains frame times */
  if(!imgExistentTimes(img)) {
    if(verbose>0) printf("  image does not contain frame times.\n");
    /* If not, then frame times cannot be copied */
    copy_frames=0;
    /* and counts can not be created */
    if(copy_counts==2) copy_counts=1;
  }
 
  /* Check if count data needs to be created */
  if(copy_counts==2 && imgExistentCounts(img)!=0)
    copy_counts=1;
 
  /* Verify that IMG contains isotope information */
  if(img->isotopeHalflife<=0.0) {
    if(verbose>0) printf("  image does not contain isotope halflife.\n");
    /* not, then count data can not be created */
    if(copy_counts==2) copy_counts=1;
  }
 
  /* Allocate memory for SIF if necessary */
  if((copy_frames || copy_counts) && sif->frameNr!=img->dimt) {
    if(sifSetmem(sif, img->dimt)!=0) return(3);
  }
 
  /* copy SIF header */
  if(copy_header) {
    if(verbose>1) printf("  copying header fields.\n");
    sif->scantime=img->scanStart;
    sif->colNr=4;
    sif->version=1;
    strcpy(sif->isotope_name, imgIsotope(img));
    if(strlen(img->studyNr)>0 && strcmp(img->studyNr, ".")!=0)
      strlcpy(sif->studynr, img->studyNr, MAX_STUDYNR_LEN+1);
    else
      strcpy(sif->studynr, "");
  }
 
  /* copy frame times */
  if(copy_frames) {
    if(verbose>1) printf("  copying frame times.\n");
    for(int fi=0; fi<img->dimt; fi++) {
      sif->x1[fi]=img->start[fi]; sif->x2[fi]=img->end[fi];
    }
  }
 
  /* copy or create counts, if required */
  if(copy_counts==2) {
    if(verbose>1) printf("  creating count data.\n");
    /* Calculate average of pixel values */
    long long pxlNr=0;
    for(int fi=0; fi<img->dimt; fi++) {
      double v=0.0;
      for(int k=0; k<img->dimz; k++)
        for(int j=0; j<img->dimy; j++)
          for(int i=0; i<img->dimx; i++) if(isfinite(img->m[k][j][i][fi])) {
            v+=img->m[k][j][i][fi];
            pxlNr++;
          }
      if(pxlNr>0) v/=(double)pxlNr;
      sif->trues[fi]=v;
    }
    /* Multiply by frame durations, unless we have raw data */
    if(img->type!=IMG_TYPE_RAW)
      for(int fi=0; fi<img->dimt; fi++)
        sif->trues[fi]*=(img->end[fi]-img->start[fi]);
    /* Remove decay correction, unless we have raw data */
    if(img->type!=IMG_TYPE_RAW 
         && (img->decayCorrection==IMG_DC_UNKNOWN || img->decayCorrection==IMG_DC_CORRECTED)) {
      double lambda, cf, dur;
      lambda=-hl2lambda(img->isotopeHalflife);
      for(int fi=0; fi<img->dimt; fi++) {
        dur=img->end[fi]-img->start[fi];
        cf=hlLambda2factor(lambda, img->start[fi], dur);
        if(cf>0.0) sif->trues[fi]*=cf;
      }
    }
    /* Scale values to a realistic level */
    double v=sif->trues[0];
    for(int fi=1; fi<sif->frameNr; fi++) if(sif->trues[fi]>v) v=sif->trues[fi];
    v=2.0E+07/v;
    for(int fi=0; fi<sif->frameNr; fi++) sif->trues[fi]*=v;
    /* Prompts are set to Trues and Randoms are set to zero */
    for(int fi=0; fi<sif->frameNr; fi++) {
      sif->prompts[fi]=sif->trues[fi];
      sif->randoms[fi]=0.0;
      if(sif->trues[fi]<1.0) sif->trues[fi]=1.0;
      sif->weights[fi]=img->weight[fi];
    }
  } else if(copy_counts!=0) {
    if(verbose>1) printf("  copying count data.\n");
    for(int fi=0; fi<img->dimt; fi++) {
      sif->prompts[fi]=img->prompts[fi];
      sif->randoms[fi]=img->randoms[fi];
      sif->trues[fi]=sif->prompts[fi]-sif->randoms[fi];
      if(sif->trues[fi]<1.0) sif->trues[fi]=1.0;
      sif->weights[fi]=img->weight[fi];
    }
  }
 
  return(0);
}
/******************************************************************************/
 
/******************************************************************************/