X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=libctsim%2Fscanner.cpp;h=6dbfec8371a71f15c9953a8cbf77150ea783b66d;hb=11ea72090da18aa290e2c3ab217f1d27736bca50;hp=d577ebb293cd45f11646e7241dd5a90af106c815;hpb=4a5567b8df652cc3168bb9d439bc23f973a2b5ea;p=ctsim.git diff --git a/libctsim/scanner.cpp b/libctsim/scanner.cpp index d577ebb..6dbfec8 100644 --- a/libctsim/scanner.cpp +++ b/libctsim/scanner.cpp @@ -7,9 +7,9 @@ ** Date Started: 1984 ** ** This is part of the CTSim program -** Copyright (C) 1983-2000 Kevin Rosenberg +** Copyright (c) 1983-2001 Kevin Rosenberg ** -** $Id: scanner.cpp,v 1.26 2001/01/27 21:02:20 kevin Exp $ +** $Id: scanner.cpp,v 1.31 2001/02/20 17:44:14 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 @@ -82,10 +82,11 @@ DetectorArray::~DetectorArray (void) * 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 dViewRatio, + double dScanRatio) { - m_phmLen = phm.maxAxisLength(); // maximal length along an axis - m_fail = false; m_idGeometry = convertGeometryNameToID (geometryName); if (m_idGeometry == GEOMETRY_INVALID) { @@ -107,50 +108,56 @@ Scanner::Scanner (const Phantom& phm, const char* const geometryName, int nDet, 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_dViewRatio = dViewRatio; + m_dScanRatio = dScanRatio; + m_dViewDiameter = phm.getDiameterBoundaryCircle() * m_dViewRatio; + m_dFocalLength = (m_dViewDiameter / 2) * dFocalLengthRatio; + 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.xd2 = m_dXCenter + dHalfDetLen + dDetectorArrayEndOffset; m_initPos.yd2 = m_dYCenter - m_dFocalLength; 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 = 2 * m_dFocalLength * 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; @@ -158,30 +165,29 @@ Scanner::Scanner (const Phantom& phm, const char* const geometryName, int nDet, 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.xd2 = m_dXCenter + dHalfDetLen + dDetectorArrayEndOffset; m_initPos.yd2 = m_dYCenter - m_dFocalLength; 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; + } + m_dAngularDetIncrement = 2 * m_detInc; // Angular Position 2x gamma angle + m_dAngularDetLen = 2 * m_detLen + 2 * dDetectorArrayEndOffset; 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;; @@ -308,14 +314,16 @@ Scanner::collectProjections (Projections& proj, const Phantom& phm, const int iS 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); @@ -325,7 +333,7 @@ Scanner::collectProjections (Projections& proj, const Phantom& phm, const int iS 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);