r595: no message

[ctsim.git] / libctsim / projections.cpp

diff --git a/libctsim/projections.cpp b/libctsim/projections.cpp
index fe431c07dfa501358d8aa3a9274c2d84f41148a9..bec5c0af5fdad93201d403bedfb5cf66dadac009 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 1.53 2001/03/02 20:07:10 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
@@ -881,3 +881,84 @@ 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++) {
+    long* pLong = reinterpret_cast<long*>(pData + lDataPos+0);
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (pLong);
+#endif
+    long lProjNumber = *pLong;
+
+    pLong = reinterpret_cast<long*>(pData + lDataPos+20);
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (pLong);
+#endif
+    long lEscale = *pLong;
+
+    pLong = reinterpret_cast<long*>(pData + lDataPos+28);
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (pLong);
+#endif
+    long lTime = *pLong;
+
+    float* pFloat = reinterpret_cast<float*>(pData + lDataPos+4);
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (pFloat);
+#endif
+    double dAlpha = *pFloat + HALFPI;
+
+    pFloat = reinterpret_cast<float*>(pData + lDataPos+12);
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (pFloat);
+#endif
+    double dAlign = *pFloat;
+
+    pFloat = reinterpret_cast<float*>(pData + lDataPos+16);
+#ifndef WORDS_BIGENDIAN
+    SwapBytes4 (pFloat);
+#endif
+    double dMaxValue = *pFloat;
+
+    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;
+}
+