+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) // two's complement signed conversion
+ iV = iV - 65536;
+ double dCosScale = cos ((id + 1 - iCenter) * dBetaInc);
+ detval[id] = iV / (dTempScale * dCosScale);
+ lDataPos += 2;
+ }
+ }
+
+ return true;
+}
+
+
+ParallelRaysums::ParallelRaysums (Projections* pProjections)
+: m_ppCoordinates(NULL), m_iNumCoordinates(0)
+{
+ int nDet = pProjections->nDet();
+ int nView = pProjections->nView();
+ int iGeometry = pProjections->geometry();
+ double dDetInc = pProjections->detInc();
+ double dDetStart = pProjections->detStart();
+ double dFocalLength = pProjections->focalLength();
+
+ m_iNumCoordinates = nDet * nView;
+ m_ppCoordinates = new ParallelRaysumCoordinate* [m_iNumCoordinates];
+ for (int i = 0; i < m_iNumCoordinates; i++)
+ m_ppCoordinates[i] = new ParallelRaysumCoordinate;
+
+ ParallelRaysumCoordinate** ppCurrentCoordinate = m_ppCoordinates;
+
+ for (int iV = 0; iV < nView; iV++) {
+ double dViewAngle = pProjections->getDetectorArray(iV).viewAngle();
+ for (int iD = 0; iD < nDet; iD++) {
+ ParallelRaysumCoordinate* pC = *ppCurrentCoordinate;
+ if (iGeometry == Scanner::GEOMETRY_PARALLEL) {
+ pC->m_dTheta = dViewAngle;
+ pC->m_dT = dDetStart + (iD * dDetInc);
+ } else if (iGeometry == Scanner::GEOMETRY_EQUILINEAR) {
+ double dDetPos = dDetStart + (iD * dDetInc);
+ double dFanAngle = atan (dDetPos / pProjections->sourceDetectorLength());
+ pC->m_dTheta = dViewAngle + dFanAngle;
+ pC->m_dT = dFocalLength * sin(dFanAngle);
+ } else if (iGeometry == Scanner::GEOMETRY_EQUIANGULAR) {
+ double dFanAngle = dDetStart + (iD * dDetInc);
+ pC->m_dTheta = dViewAngle + dFanAngle;
+ pC->m_dT = dFocalLength * sin(dFanAngle);
+ }
+ ++ppCurrentCoordinate;
+ }
+ }
+}
+
+ParallelRaysums::~ParallelRaysums()
+{
+ for (int i = 0; i < m_iNumCoordinates; i++)
+ delete m_ppCoordinates[i];
+
+ delete m_ppCoordinates;
+}
+
+void
+ParallelRaysums::getLimits (double* dMinT, double* dMaxT, double* dMinTheta, double* dMaxTheta) const
+{
+ if (m_iNumCoordinates <= 0)
+ return;
+
+ *dMinT = *dMaxT = m_ppCoordinates[0]->m_dT;
+ *dMinTheta = *dMaxTheta = m_ppCoordinates[0]->m_dTheta;
+
+ for (int i = 0; i < m_iNumCoordinates; i++) {
+ double dT = m_ppCoordinates[i]->m_dT;
+ double dTheta = m_ppCoordinates[i]->m_dTheta;
+ if (dT < *dMinT)
+ *dMinT = dT;
+ else if (dT > *dMaxT)
+ *dMaxT = dT;
+
+ if (dTheta < *dMinTheta)
+ *dMinTheta = dTheta;
+ else if (dTheta > *dMaxTheta)
+ *dMaxTheta = dTheta;
+ }
+}