r623: no message

[ctsim.git] / libctsim / projections.cpp

diff --git a/libctsim/projections.cpp b/libctsim/projections.cpp
index fe431c07dfa501358d8aa3a9274c2d84f41148a9..627ccb91f11ba32f85e8feabbca0297487f57509 100644 (file)
--- a/libctsim/projections.cpp
+++ b/libctsim/projections.cpp
@@ -8,7 +8,7 @@
 **  This is part of the CTSim program
 **  Copyright (c) 1983-2001 Kevin Rosenberg
 **
-**  $Id: projections.cpp,v 1.50 2001/03/01 07:30:49 kevin Exp $
+**  $Id: projections.cpp,v 1.54 2001/03/05 21:59:55 kevin Exp $
 **
 **  This program is free software; you can redistribute it and/or modify
 **  it under the terms of the GNU General Public License (version 2) as
@@ -820,8 +820,8 @@ Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag,
   for (unsigned int ix = 0; ix < ny; ix++) {
     for (unsigned int iy = 0; iy < ny; iy++) {
       if (iInterpolationID == POLAR_INTERP_NEAREST) {
-        int iView = nearest<int> (ppdView[ix][iy]);
-        int iDet = nearest<int> (ppdDet[ix][iy]);
+        unsigned int iView = nearest<int> (ppdView[ix][iy]);
+        unsigned int iDet = nearest<int> (ppdDet[ix][iy]);
         if (iView == nView) {
           iView = 0;
        //   iDet = m_nDet - iDet;
@@ -836,9 +836,9 @@ Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag,
           v[ix][iy] = 0;
         }
       } else if (iInterpolationID == POLAR_INTERP_BILINEAR) {
-        int iFloorView = static_cast<int>(ppdView[ix][iy]);
+        unsigned int iFloorView = static_cast<int>(ppdView[ix][iy]);
         double dFracView = ppdView[ix][iy] - iFloorView;
-        int iFloorDet = static_cast<int>(ppdDet[ix][iy]);
+        unsigned int iFloorDet = static_cast<int>(ppdDet[ix][iy]);
         double dFracDet = ppdDet[ix][iy] - iFloorDet;
 
         if (iFloorDet >= 0 && iFloorView >= 0) { 
@@ -881,3 +881,85 @@ Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag,
 }
 
 
+bool
+Projections::initFromSomatomAR_STAR (int iNViews, int iNDets, unsigned char* pData, unsigned long lDataLength)
+{
+  init (iNViews, iNDets);
+  m_geometry = Scanner::GEOMETRY_EQUIANGULAR;
+  m_dFanBeamAngle = iNDets * convertDegreesToRadians (3.06976 / 60);
+  m_dFocalLength = 51;
+  m_dSourceDetectorLength = 89;
+  m_detInc = convertDegreesToRadians (3.06976 / 60);
+  m_detStart = -m_dFanBeamAngle / 2;
+  m_rotInc = TWOPI / static_cast<double>(iNViews);
+  m_rotStart = HALFPI;
+  m_dViewDiameter = sin (m_dFanBeamAngle / 2) * m_dFocalLength * 2;
+
+  if (iNDets != 1024)
+    return false;
+  bool bValid = (iNViews == 750 && lDataLength == 1560000L) || (iNViews == 950 && lDataLength == 1976000L) || (iNViews == 1500 && lDataLength == 3120000);
+  if (! bValid)
+    return false;
+
+  long lDataPos = 0;
+  for (int iv = 0; iv < iNViews; iv++) {
+    unsigned char* pArgBase = pData + lDataPos;
+    unsigned char* p = pArgBase+0;
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (p);
+#endif
+    long lProjNumber = *reinterpret_cast<long*>(p);
+
+    p = pArgBase+20;
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (p);
+#endif
+    long lEscale = *reinterpret_cast<long*>(p);
+
+    p = pArgBase+28;
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (p);
+#endif
+    long lTime = *reinterpret_cast<long*>(p);
+
+    p = pArgBase + 4;
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (p);
+#endif
+    double dAlpha = *reinterpret_cast<float*>(p) + HALFPI;
+
+    p = pArgBase+12;
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (p);
+#endif
+    double dAlign = *reinterpret_cast<float*>(p);
+
+    p = pArgBase + 16;
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (p);
+#endif
+    double dMaxValue = *reinterpret_cast<float*>(p);
+
+    lDataPos += 32;
+    double dEScale =  pow (2.0, -lEscale);
+    double dBetaInc = convertDegreesToRadians (3.06976 / 60);
+    int iCenter = (iNDets + 1) / 2;
+
+    DetectorArray& detArray = getDetectorArray( iv );
+    detArray.setViewAngle (dAlpha);
+    DetectorValue* detval = detArray.detValues();
+
+    double dTempScale = 2294.4871 * dEScale;
+    for (int id = 0; id < iNDets; id++) {
+      int iV = pData[lDataPos+1] + 256 * pData[lDataPos];
+      if (iV > 32767)
+        iV = iV - 65536;
+      double dCosScale = cos ((id + 1 - iCenter) * dBetaInc);
+      detval[id] = iV / (dTempScale * dCosScale);
+      lDataPos += 2;
+    }
+  }
+
+  return true;
+}
+