** This is part of the CTSim program
** Copyright (c) 1983-2001 Kevin Rosenberg
**
-** $Id: projections.cpp,v 1.51 2001/03/02 02:08:14 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
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;
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) {
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;
- if (iNViews == 750 &&
+ 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;
}