ProjDataInfoCylindricalNoArcCorr.inl

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//
//
/*
    Copyright (C) 2000- 2005, Hammersmith Imanet Ltd
    This file is part of STIR.
 
    SPDX-License-Identifier: Apache-2.0
 
    See STIR/LICENSE.txt for details
*/
 
#include "stir/Bin.h"
#include "stir/Succeeded.h"
#include "stir/round.h"
#include <math.h>
 
START_NAMESPACE_STIR
 
void
ProjDataInfoCylindricalNoArcCorr::initialise_uncompressed_view_tangpos_to_det1det2_if_not_done_yet() const
{
  // for efficiency reasons, use "Double-Checked-Locking(DCL) pattern" with OpenMP atomic operation
  // OpenMP v3.1 or later required
  // thanks to yohjp:
  // http://stackoverflow.com/questions/27975737/how-to-handle-cached-data-structures-with-multi-threading-e-g-openmp
#if defined(STIR_OPENMP) && _OPENMP >= 201012
  bool initialised;
#  pragma omp atomic read
  initialised = uncompressed_view_tangpos_to_det1det2_initialised;
 
  if (!initialised)
#endif
    {
#if defined(STIR_OPENMP)
#  pragma omp critical(PROJDATAINFOCYLINDRICALNOARCCORR_VIEWTANGPOS_TO_DETS)
#endif
      {
        if (!uncompressed_view_tangpos_to_det1det2_initialised)
          initialise_uncompressed_view_tangpos_to_det1det2();
      }
    }
}
 
void
ProjDataInfoCylindricalNoArcCorr::initialise_det1det2_to_uncompressed_view_tangpos_if_not_done_yet() const
{
  // as above
#if defined(STIR_OPENMP) && _OPENMP >= 201012
  bool initialised;
#  pragma omp atomic read
  initialised = det1det2_to_uncompressed_view_tangpos_initialised;
 
  if (!initialised)
#endif
    {
#if defined(STIR_OPENMP)
#  pragma omp critical(PROJDATAINFOCYLINDRICALNOARCCORR_DETS_TO_VIEWTANGPOS)
#endif
      {
        if (!det1det2_to_uncompressed_view_tangpos_initialised)
          initialise_det1det2_to_uncompressed_view_tangpos();
      }
    }
}
 
float
ProjDataInfoCylindricalNoArcCorr::get_s(const Bin& bin) const
{
  return ring_radius * sin(bin.tangential_pos_num() * angular_increment);
}
 
float
ProjDataInfoCylindricalNoArcCorr::get_angular_increment() const
{
  return angular_increment;
}
 
void
ProjDataInfoCylindricalNoArcCorr::get_det_num_pair_for_view_tangential_pos_num(int& det1_num,
                                                                               int& det2_num,
                                                                               const int view_num,
                                                                               const int tang_pos_num) const
{
  assert(get_view_mashing_factor() == 1);
  this->initialise_uncompressed_view_tangpos_to_det1det2_if_not_done_yet();
 
  det1_num = uncompressed_view_tangpos_to_det1det2[view_num][tang_pos_num].det1_num;
  det2_num = uncompressed_view_tangpos_to_det1det2[view_num][tang_pos_num].det2_num;
}
 
bool
ProjDataInfoCylindricalNoArcCorr::get_view_tangential_pos_num_for_det_num_pair(int& view_num,
                                                                               int& tang_pos_num,
                                                                               const int det1_num,
                                                                               const int det2_num) const
{
  assert(det1_num != det2_num);
  this->initialise_det1det2_to_uncompressed_view_tangpos_if_not_done_yet();
 
  view_num = det1det2_to_uncompressed_view_tangpos[det1_num][det2_num].view_num / get_view_mashing_factor();
  tang_pos_num = det1det2_to_uncompressed_view_tangpos[det1_num][det2_num].tang_pos_num;
  return det1det2_to_uncompressed_view_tangpos[det1_num][det2_num].swap_detectors;
}
 
Succeeded
ProjDataInfoCylindricalNoArcCorr::get_bin_for_det_pair(
    Bin& bin, const int det_num1, const int ring_num1, const int det_num2, const int ring_num2, const int timing_pos_num) const
{
  if (get_view_tangential_pos_num_for_det_num_pair(bin.view_num(), bin.tangential_pos_num(), det_num1, det_num2))
    {
      bin.timing_pos_num() = timing_pos_num;
      return get_segment_axial_pos_num_for_ring_pair(bin.segment_num(), bin.axial_pos_num(), ring_num1, ring_num2);
    }
  else
    {
      bin.timing_pos_num() = -timing_pos_num;
      return get_segment_axial_pos_num_for_ring_pair(bin.segment_num(), bin.axial_pos_num(), ring_num2, ring_num1);
    }
}
 
Succeeded
ProjDataInfoCylindricalNoArcCorr::get_bin_for_det_pos_pair(Bin& bin, const DetectionPositionPair<>& dp) const
{
  return get_bin_for_det_pair(bin,
                              dp.pos1().tangential_coord(),
                              dp.pos1().axial_coord(),
                              dp.pos2().tangential_coord(),
                              dp.pos2().axial_coord(),
                              this->get_tof_mash_factor() == 0
                                  ? 0 // use timing_pos==0 in the nonTOF case
                                  : stir::round((float)dp.timing_pos() / this->get_tof_mash_factor()));
}
void
ProjDataInfoCylindricalNoArcCorr::get_det_pair_for_bin(
    int& det_num1, int& ring_num1, int& det_num2, int& ring_num2, const Bin& bin) const
{
  // if (bin.timing_pos_num()>=0)
  // {
  get_det_num_pair_for_view_tangential_pos_num(det_num1, det_num2, bin.view_num(), bin.tangential_pos_num());
  get_ring_pair_for_segment_axial_pos_num(ring_num1, ring_num2, bin.segment_num(), bin.axial_pos_num());
  //}
  // else
  //{
  //  get_det_num_pair_for_view_tangential_pos_num(det_num2, det_num1, bin.view_num(), bin.tangential_pos_num());
  //  get_ring_pair_for_segment_axial_pos_num( ring_num2, ring_num1, bin.segment_num(), bin.axial_pos_num());
  // }
}
 
void
ProjDataInfoCylindricalNoArcCorr::get_det_pos_pair_for_bin(DetectionPositionPair<>& dp, const Bin& bin) const
{
  // This is a bit complicated as DetectionPositionPair<>::timing_pos() was an unsigned int at some point,
  // while Bin uses an int. So swap detectors around.
 
  // lousy work around because types don't match (short/int). TODO remove!
  int t1, a1, t2, a2;
  get_det_pair_for_bin(t1, a1, t2, a2, bin);
  if (bin.timing_pos_num() >= 0)
    {
      dp.pos1().tangential_coord() = t1;
      dp.pos1().axial_coord() = a1;
      dp.pos2().tangential_coord() = t2;
      dp.pos2().axial_coord() = a2;
    }
  else
    {
      dp.pos1().tangential_coord() = t2;
      dp.pos1().axial_coord() = a2;
      dp.pos2().tangential_coord() = t1;
      dp.pos2().axial_coord() = a1;
    }
 
  dp.timing_pos() = std::abs(bin.timing_pos_num()) * this->get_tof_mash_factor();
}
 
END_NAMESPACE_STIR