** 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
}
+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;
+}
+