** This is part of the CTSim program
** Copyright (c) 1983-2001 Kevin Rosenberg
**
-** $Id: scanner.cpp,v 1.27 2001/01/28 19:10:18 kevin Exp $
+** $Id: scanner.cpp,v 1.33 2001/03/01 07:30:49 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
* int nSample Number of rays per detector
*/
-Scanner::Scanner (const Phantom& phm, const char* const geometryName, int nDet, int nView, int nSample, const double rot_anglen, const double dFocalLengthRatio, const double dFieldOfViewRatio)
+Scanner::Scanner (const Phantom& phm, const char* const geometryName,
+ int nDet, int nView, int nSample, const double rot_anglen,
+ const double dFocalLengthRatio, const double dCenterDetectorRatio,
+ const double dViewRatio, const double dScanRatio)
{
- m_phmLen = phm.maxAxisLength(); // maximal length along an axis
-
m_fail = false;
m_idGeometry = convertGeometryNameToID (geometryName);
if (m_idGeometry == GEOMETRY_INVALID) {
m_nView = nView;
m_nSample = nSample;
m_dFocalLengthRatio = dFocalLengthRatio;
- m_dFieldOfViewRatio = dFieldOfViewRatio;
- m_dFocalLength = (m_phmLen * SQRT2 / 2) * dFocalLengthRatio;
- m_dFieldOfView = m_phmLen * SQRT2 * dFieldOfViewRatio;
+ m_dCenterDetectorRatio = dCenterDetectorRatio;
+ m_dViewRatio = dViewRatio;
+ m_dScanRatio = dScanRatio;
+
+ m_dViewDiameter = phm.getDiameterBoundaryCircle() * m_dViewRatio;
+ m_dFocalLength = (m_dViewDiameter / 2) * m_dFocalLengthRatio;
+ m_dCenterDetectorLength = (m_dViewDiameter / 2) * m_dCenterDetectorRatio;
+ m_dSourceDetectorLength = m_dFocalLength + m_dCenterDetectorLength;
+ m_dScanDiameter = m_dViewDiameter * m_dScanRatio;
m_dXCenter = phm.xmin() + (phm.xmax() - phm.xmin()) / 2;
m_dYCenter = phm.ymin() + (phm.ymax() - phm.ymin()) / 2;
m_rotLen = rot_anglen;
m_rotInc = m_rotLen / m_nView;
if (m_idGeometry == GEOMETRY_PARALLEL) {
- m_detLen = m_dFieldOfView;
+ m_dFanBeamAngle = 0;
+ m_detLen = m_dScanDiameter;
m_detInc = m_detLen / m_nDet;
- if (m_nDet % 2 == 0) // Adjust for Even number of detectors
- m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)-1
-
+ double dDetectorArrayEndOffset = 0;
+ // For even number of detectors, make detInc slightly larger so that center lies
+ // at nDet/2. Also, extend detector array by one detInc so that all of the phantom is scanned
+ if (m_nDet % 2 == 0) { // Adjust for Even number of detectors
+ m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)
+ dDetectorArrayEndOffset = m_detInc;
+ }
+
double dHalfDetLen = m_detLen / 2;
m_initPos.xs1 = m_dXCenter - dHalfDetLen;
m_initPos.ys1 = m_dYCenter + m_dFocalLength;
- m_initPos.xs2 = m_dXCenter + dHalfDetLen;
+ m_initPos.xs2 = m_dXCenter + dHalfDetLen + dDetectorArrayEndOffset;
m_initPos.ys2 = m_dYCenter + m_dFocalLength;
m_initPos.xd1 = m_dXCenter - dHalfDetLen;
- m_initPos.yd1 = m_dYCenter - m_dFocalLength;
- m_initPos.xd2 = m_dXCenter + dHalfDetLen;
- m_initPos.yd2 = m_dYCenter - m_dFocalLength;
+ m_initPos.yd1 = m_dYCenter - m_dCenterDetectorLength;
+ m_initPos.xd2 = m_dXCenter + dHalfDetLen + dDetectorArrayEndOffset;
+ m_initPos.yd2 = m_dYCenter - m_dCenterDetectorLength;
m_initPos.angle = 0.0;
} else if (m_idGeometry == GEOMETRY_EQUILINEAR) {
-#if 0
- double dAngle = (m_dFieldOfView / 2) / cos (asin (m_dFieldOfView / 2 / m_dFocalLength));
-#else
- double dHalfSquare = m_dFieldOfView / SQRT2 / 2;
- double dFocalPastPhm = m_dFocalLength - dHalfSquare;
- if (dFocalPastPhm <= 0.) {
+ if (m_dScanDiameter / 2 >= m_dFocalLength) {
m_fail = true;
- m_failMessage = "Focal Point inside of phantom";
+ m_failMessage = "Invalid geometry: Focal length must be larger than scan length";
return;
}
- double dAngle = atan( dHalfSquare / dFocalPastPhm );
-#endif
- double dHalfDetLen = 2 * m_dFocalLength * tan (dAngle);
+
+ const double dAngle = asin ((m_dScanDiameter / 2) / m_dFocalLength);
+ const double dHalfDetLen = m_dSourceDetectorLength * tan (dAngle);
m_detLen = dHalfDetLen * 2;
m_detInc = m_detLen / m_nDet;
- if (m_nDet % 2 == 0) // Adjust for Even number of detectors
- m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)-1
-
+ double dDetectorArrayEndOffset = 0;
+ if (m_nDet % 2 == 0) { // Adjust for Even number of detectors
+ m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)
+ dDetectorArrayEndOffset = m_detInc;
+ }
+
+ m_dFanBeamAngle = dAngle * 2;
m_initPos.angle = 0.0;
m_initPos.xs1 = m_dXCenter;
m_initPos.ys1 = m_dYCenter + m_dFocalLength;
m_initPos.xs2 = m_dXCenter;
m_initPos.ys2 = m_dYCenter + m_dFocalLength;
m_initPos.xd1 = m_dXCenter - dHalfDetLen;
- m_initPos.yd1 = m_dYCenter - m_dFocalLength;
- m_initPos.xd2 = m_dXCenter + dHalfDetLen;
- m_initPos.yd2 = m_dYCenter - m_dFocalLength;
+ m_initPos.yd1 = m_dYCenter - m_dCenterDetectorLength;
+ m_initPos.xd2 = m_dXCenter + dHalfDetLen + dDetectorArrayEndOffset;
+ m_initPos.yd2 = m_dYCenter - m_dCenterDetectorLength;
m_initPos.angle = 0.0;
} else if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
-#if 0
- double dAngle = atan ((m_dFieldOfView / 2) / m_dFocalLength);
-#else
- double dHalfSquare = m_dFieldOfView / SQRT2 / 2;
- double dFocalPastPhm = m_dFocalLength - dHalfSquare;
- if (dFocalPastPhm <= 0.) {
+ if (m_dScanDiameter / 2 > m_dFocalLength) {
m_fail = true;
- m_failMessage = "Focal Point inside of phantom";
+ m_failMessage = "Invalid geometry: Focal length must be larger than scan length";
return;
}
- double dAngle = atan ( dHalfSquare / dFocalPastPhm );
-#endif
+ const double dAngle = asin ((m_dScanDiameter / 2) / m_dFocalLength);
+
m_detLen = 2 * dAngle;
m_detInc = m_detLen / m_nDet;
- if (m_nDet % 2 == 0) // Adjust for Even number of detectors
- m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)-1
- m_dAngularDetIncrement = m_detInc * 2; // Angular Position 2x gamma angle
- m_dAngularDetLen = m_detLen * 2;
+ double dDetectorArrayEndOffset = 0;
+ if (m_nDet % 2 == 0) { // Adjust for Even number of detectors
+ m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)
+ dDetectorArrayEndOffset = m_detInc;
+ }
+ double dA1 = acos ((m_dScanDiameter / 2) / m_dCenterDetectorLength);
+ double dAngularScale = 2 * (HALFPI + dAngle - dA1) / m_detLen;
+ m_dAngularDetLen = dAngularScale * (m_detLen + dDetectorArrayEndOffset);
+ m_dAngularDetIncrement = dAngularScale * m_detInc;
m_initPos.dAngularDet = -m_dAngularDetLen / 2;
+ m_dFanBeamAngle = dAngle * 2;
m_initPos.angle = 0;
m_initPos.xs1 = m_dXCenter;
m_initPos.ys1 = m_dYCenter + m_dFocalLength;;
}
void
-Scanner::collectProjections (Projections& proj, const Phantom& phm, const int iStartView, const int iNumViews, bool bStoreAtViewPosition, const int trace, SGP* pSGP)
+Scanner::collectProjections (Projections& proj, const Phantom& phm, const int iStartView, const int iNumViews,
+ bool bStoreAtViewPosition, const int trace, SGP* pSGP)
+{
+ int iStorageOffset = (bStoreAtViewPosition ? iStartView : 0);
+ collectProjections (proj, phm, iStartView, iNumViews, iStorageOffset, trace, pSGP);
+}
+
+void
+Scanner::collectProjections (Projections& proj, const Phantom& phm, const int iStartView, const int iNumViews,
+ int iStorageOffset, const int trace, SGP* pSGP)
{
m_trace = trace;
double start_angle = iStartView * proj.rotInc();
int iView;
double viewAngle;
for (iView = 0, viewAngle = start_angle; iView < iNumViews; iView++, viewAngle += proj.rotInc()) {
- int iStoragePosition = iView;
- if (bStoreAtViewPosition)
- iStoragePosition += iStartView;
-
+ int iStoragePosition = iView + iStorageOffset;
+
DetectorArray& detArray = proj.getDetectorArray( iStoragePosition );
#ifdef HAVE_SGP
if (pSGP && m_trace >= Trace::TRACE_PHANTOM) {
m_pSGP = pSGP;
- double dWindowSize = dmax (m_detLen, m_dFocalLength * 2) * SQRT2;
+ double dWindowSize = dmax (m_detLen, m_dSourceDetectorLength) * 2;
double dHalfWindowSize = dWindowSize / 2;
m_dXMinWin = m_dXCenter - dHalfWindowSize;
m_dXMaxWin = m_dXCenter + dHalfWindowSize;
m_dYMinWin = m_dYCenter - dHalfWindowSize;
m_dYMaxWin = m_dYCenter + dHalfWindowSize;
- double dHalfPhmLen = m_phmLen / 2;
m_pSGP->setWindow (m_dXMinWin, m_dYMinWin, m_dXMaxWin, m_dYMaxWin);
m_pSGP->setRasterOp (RO_COPY);
+
m_pSGP->setColor (C_RED);
m_pSGP->moveAbs (0., 0.);
- m_pSGP->drawRect (m_dXCenter - dHalfPhmLen, m_dYCenter - dHalfPhmLen, m_dXCenter + dHalfPhmLen, m_dYCenter + dHalfPhmLen);
+ m_pSGP->drawCircle (m_dViewDiameter / 2);
+
m_pSGP->moveAbs (0., 0.);
+ m_pSGP->setColor (C_GREEN);
m_pSGP->drawCircle (m_dFocalLength);
m_pSGP->setColor (C_BLUE);
m_pSGP->setTextPointSize (9);
traceShowParam ("Phantom:", "%s", PROJECTION_TRACE_ROW_PHANT_ID, C_BLACK, phm.name().c_str());
traceShowParam ("Geometry:", "%s", PROJECTION_TRACE_ROW_GEOMETRY, C_BLUE, convertGeometryIDToName(m_idGeometry));
traceShowParam ("Focal Length Ratio:", "%.2f", PROJECTION_TRACE_ROW_FOCAL_LENGTH, C_BLUE, m_dFocalLengthRatio);
- traceShowParam ("Field Of View Ratio:", "%.2f", PROJECTION_TRACE_ROW_FIELD_OF_VIEW, C_BLUE, m_dFieldOfViewRatio);
+// traceShowParam ("Field Of View Ratio:", "%.2f", PROJECTION_TRACE_ROW_FIELD_OF_VIEW, C_BLUE, m_dFieldOfViewRatio);
traceShowParam ("Num Detectors:", "%d", PROJECTION_TRACE_ROW_NDET, C_BLUE, proj.nDet());
traceShowParam ("Num Views:", "%d", PROJECTION_TRACE_ROW_NVIEW, C_BLUE, proj.nView());
traceShowParam ("Samples / Ray:", "%d", PROJECTION_TRACE_ROW_SAMPLES, C_BLUE, m_nSample);
m_pSGP->lineAbs (xs2, ys2);
m_pSGP->setPenWidth (2);
m_pSGP->moveAbs (0., 0.);
- m_pSGP->drawArc (m_dFocalLength, viewAngle + 3 * HALFPI - (m_dAngularDetLen/2), viewAngle + 3 * HALFPI + (m_dAngularDetLen/2));
+ m_pSGP->drawArc (m_dCenterDetectorLength, viewAngle + 3 * HALFPI - (m_dAngularDetLen/2), viewAngle + 3 * HALFPI + (m_dAngularDetLen/2));
}
m_pSGP->setPenWidth (1);
}
double sum = 0.0;
for (unsigned int i = 0; i < m_nSample; i++) {
if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
- xd = m_dFocalLength * cos (dAngle);
- yd = m_dFocalLength * sin (dAngle);
+ xd = m_dCenterDetectorLength * cos (dAngle);
+ yd = m_dCenterDetectorLength * sin (dAngle);
}
#ifdef HAVE_SGP
projects / ctsim.git / blobdiff