1 /*****************************************************************************
5 ** Purpose: Classes for CT scanner
6 ** Programmer: Kevin Rosenberg
9 ** This is part of the CTSim program
10 ** Copyright (C) 1983-2000 Kevin Rosenberg
12 ** $Id: scanner.cpp,v 1.25 2001/01/17 11:00:18 kevin Exp $
14 ** This program is free software; you can redistribute it and/or modify
15 ** it under the terms of the GNU General Public License (version 2) as
16 ** published by the Free Software Foundation.
18 ** This program is distributed in the hope that it will be useful,
19 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ** GNU General Public License for more details.
23 ** You should have received a copy of the GNU General Public License
24 ** along with this program; if not, write to the Free Software
25 ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 ******************************************************************************/
31 const int Scanner::GEOMETRY_INVALID = -1;
32 const int Scanner::GEOMETRY_PARALLEL = 0;
33 const int Scanner::GEOMETRY_EQUIANGULAR = 1;
34 const int Scanner::GEOMETRY_EQUILINEAR = 2;
36 const char* Scanner::s_aszGeometryName[] =
43 const char* Scanner::s_aszGeometryTitle[] =
50 const int Scanner::s_iGeometryCount = sizeof(s_aszGeometryName) / sizeof(const char*);
54 // DetectorArray Construct a DetectorArray
56 DetectorArray::DetectorArray (const int nDet)
59 m_detValues = new DetectorValue [m_nDet];
64 // ~DetectorArray Free memory allocated to a detector array
66 DetectorArray::~DetectorArray (void)
68 delete [] m_detValues;
74 * Scanner::Scanner Construct a user specified detector structure
77 * Scanner (phm, nDet, nView, nSample)
78 * Phantom& phm PHANTOM that we are making detector for
79 * int geomety Geometry of detector
80 * int nDet Number of detector along detector array
81 * int nView Number of rotated views
82 * int nSample Number of rays per detector
85 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)
87 m_phmLen = phm.maxAxisLength(); // maximal length along an axis
90 m_idGeometry = convertGeometryNameToID (geometryName);
91 if (m_idGeometry == GEOMETRY_INVALID) {
93 m_failMessage = "Invalid geometry name ";
94 m_failMessage += geometryName;
98 if (nView < 1 || nDet < 1) {
100 m_failMessage = "nView & nDet must be greater than 0";
109 m_dFocalLengthRatio = dFocalLengthRatio;
110 m_dFieldOfViewRatio = dFieldOfViewRatio;
111 m_dFocalLength = (m_phmLen * SQRT2 / 2) * dFocalLengthRatio;
112 m_dFieldOfView = m_phmLen * SQRT2 * dFieldOfViewRatio;
114 m_dXCenter = phm.xmin() + (phm.xmax() - phm.xmin()) / 2;
115 m_dYCenter = phm.ymin() + (phm.ymax() - phm.ymin()) / 2;
116 m_rotLen = rot_anglen;
117 m_rotInc = m_rotLen / m_nView;
118 if (m_idGeometry == GEOMETRY_PARALLEL) {
119 m_detLen = m_dFieldOfView;
120 m_detInc = m_detLen / m_nDet;
121 if (m_nDet % 2 == 0) // Adjust for Even number of detectors
122 m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)-1
124 double dHalfDetLen = m_detLen / 2;
125 m_initPos.xs1 = m_dXCenter - dHalfDetLen;
126 m_initPos.ys1 = m_dYCenter + m_dFocalLength;
127 m_initPos.xs2 = m_dXCenter + dHalfDetLen;
128 m_initPos.ys2 = m_dYCenter + m_dFocalLength;
129 m_initPos.xd1 = m_dXCenter - dHalfDetLen;
130 m_initPos.yd1 = m_dYCenter - m_dFocalLength;
131 m_initPos.xd2 = m_dXCenter + dHalfDetLen;
132 m_initPos.yd2 = m_dYCenter - m_dFocalLength;
133 m_initPos.angle = 0.0;
134 } else if (m_idGeometry == GEOMETRY_EQUILINEAR) {
136 double dAngle = (m_dFieldOfView / 2) / cos (asin (m_dFieldOfView / 2 / m_dFocalLength));
138 double dHalfSquare = m_dFieldOfView / SQRT2 / 2;
139 double dFocalPastPhm = m_dFocalLength - dHalfSquare;
140 if (dFocalPastPhm <= 0.) {
142 m_failMessage = "Focal Point inside of phantom";
145 double dAngle = atan( dHalfSquare / dFocalPastPhm );
147 double dHalfDetLen = 2 * m_dFocalLength * tan (dAngle);
149 m_detLen = dHalfDetLen * 2;
150 m_detInc = m_detLen / m_nDet;
151 if (m_nDet % 2 == 0) // Adjust for Even number of detectors
152 m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)-1
154 m_initPos.angle = 0.0;
155 m_initPos.xs1 = m_dXCenter;
156 m_initPos.ys1 = m_dYCenter + m_dFocalLength;
157 m_initPos.xs2 = m_dXCenter;
158 m_initPos.ys2 = m_dYCenter + m_dFocalLength;
159 m_initPos.xd1 = m_dXCenter - dHalfDetLen;
160 m_initPos.yd1 = m_dYCenter - m_dFocalLength;
161 m_initPos.xd2 = m_dXCenter + dHalfDetLen;
162 m_initPos.yd2 = m_dYCenter - m_dFocalLength;
163 m_initPos.angle = 0.0;
164 } else if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
166 double dAngle = atan ((m_dFieldOfView / 2) / m_dFocalLength);
168 double dHalfSquare = m_dFieldOfView / SQRT2 / 2;
169 double dFocalPastPhm = m_dFocalLength - dHalfSquare;
170 if (dFocalPastPhm <= 0.) {
172 m_failMessage = "Focal Point inside of phantom";
175 double dAngle = atan ( dHalfSquare / dFocalPastPhm );
177 m_detLen = 2 * dAngle;
178 m_detInc = m_detLen / m_nDet;
179 if (m_nDet % 2 == 0) // Adjust for Even number of detectors
180 m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)-1
181 m_dAngularDetIncrement = m_detInc * 2; // Angular Position 2x gamma angle
182 m_dAngularDetLen = m_detLen * 2;
183 m_initPos.dAngularDet = -m_dAngularDetLen / 2;
186 m_initPos.xs1 = m_dXCenter;
187 m_initPos.ys1 = m_dYCenter + m_dFocalLength;;
188 m_initPos.xs2 = m_dXCenter;
189 m_initPos.ys2 = m_dYCenter + m_dFocalLength;
192 // Calculate incrementatal rotation matrix
194 xlat_mtx2 (m_rotmtxIncrement, -m_dXCenter, -m_dYCenter);
195 rot_mtx2 (temp, m_rotInc);
196 mult_mtx2 (m_rotmtxIncrement, temp, m_rotmtxIncrement);
197 xlat_mtx2 (temp, m_dXCenter, m_dYCenter);
198 mult_mtx2 (m_rotmtxIncrement, temp, m_rotmtxIncrement);
202 Scanner::~Scanner (void)
208 Scanner::convertGeometryIDToName (const int geomID)
210 const char *name = "";
212 if (geomID >= 0 && geomID < s_iGeometryCount)
213 return (s_aszGeometryName[geomID]);
219 Scanner::convertGeometryIDToTitle (const int geomID)
221 const char *title = "";
223 if (geomID >= 0 && geomID < s_iGeometryCount)
224 return (s_aszGeometryName[geomID]);
230 Scanner::convertGeometryNameToID (const char* const geomName)
232 int id = GEOMETRY_INVALID;
234 for (int i = 0; i < s_iGeometryCount; i++)
235 if (strcasecmp (geomName, s_aszGeometryName[i]) == 0) {
245 * collectProjections Calculate projections for a Phantom
248 * collectProjections (proj, phm, start_view, nView, bStoreViewPos, trace)
249 * Projectrions& proj Projection storage
250 * Phantom& phm Phantom for which we collect projections
251 * bool bStoreViewPos TRUE then storage proj at normal view position
252 * int trace Trace level
257 Scanner::collectProjections (Projections& proj, const Phantom& phm, const int trace, SGP* pSGP)
259 collectProjections (proj, phm, 0, proj.nView(), true, trace, pSGP);
263 Scanner::collectProjections (Projections& proj, const Phantom& phm, const int iStartView, const int iNumViews, bool bStoreAtViewPosition, const int trace, SGP* pSGP)
266 double start_angle = iStartView * proj.rotInc();
268 // Calculate initial rotation matrix
269 GRFMTX_2D rotmtx_initial, temp;
270 xlat_mtx2 (rotmtx_initial, -m_dXCenter, -m_dYCenter);
271 rot_mtx2 (temp, start_angle);
272 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
273 xlat_mtx2 (temp, m_dXCenter, m_dYCenter);
274 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
276 double xd1=0, yd1=0, xd2=0, yd2=0;
277 if (m_idGeometry != GEOMETRY_EQUIANGULAR) {
282 xform_mtx2 (rotmtx_initial, xd1, yd1); // rotate detector endpoints
283 xform_mtx2 (rotmtx_initial, xd2, yd2); // to initial view_angle
286 double xs1 = m_initPos.xs1;
287 double ys1 = m_initPos.ys1;
288 double xs2 = m_initPos.xs2;
289 double ys2 = m_initPos.ys2;
290 xform_mtx2 (rotmtx_initial, xs1, ys1); // rotate source endpoints to
291 xform_mtx2 (rotmtx_initial, xs2, ys2); // initial view angle
295 for (iView = 0, viewAngle = start_angle; iView < iNumViews; iView++, viewAngle += proj.rotInc()) {
296 int iStoragePosition = iView;
297 if (bStoreAtViewPosition)
298 iStoragePosition += iStartView;
300 DetectorArray& detArray = proj.getDetectorArray( iStoragePosition );
303 if (pSGP && m_trace >= Trace::TRACE_PHANTOM) {
305 double dWindowSize = dmax (m_detLen, m_dFocalLength * 2) * SQRT2;
306 double dHalfWindowSize = dWindowSize / 2;
307 m_dXMinWin = m_dXCenter - dHalfWindowSize;
308 m_dXMaxWin = m_dXCenter + dHalfWindowSize;
309 m_dYMinWin = m_dYCenter - dHalfWindowSize;
310 m_dYMaxWin = m_dYCenter + dHalfWindowSize;
311 double dHalfPhmLen = m_phmLen / 2;
313 m_pSGP->setWindow (m_dXMinWin, m_dYMinWin, m_dXMaxWin, m_dYMaxWin);
314 m_pSGP->setRasterOp (RO_COPY);
315 m_pSGP->setColor (C_RED);
316 m_pSGP->moveAbs (0., 0.);
317 m_pSGP->drawRect (m_dXCenter - dHalfPhmLen, m_dYCenter - dHalfPhmLen, m_dXCenter + dHalfPhmLen, m_dYCenter + dHalfPhmLen);
318 m_pSGP->moveAbs (0., 0.);
319 m_pSGP->drawCircle (m_dFocalLength);
320 m_pSGP->setColor (C_BLUE);
322 m_dTextHeight = m_pSGP->getCharHeight ();
324 traceShowParam ("Phantom:", "%s", PROJECTION_TRACE_ROW_PHANT_ID, C_BLACK, phm.name().c_str());
325 traceShowParam ("Geometry:", "%s", PROJECTION_TRACE_ROW_GEOMETRY, C_BLUE, convertGeometryIDToName(m_idGeometry));
326 traceShowParam ("Focal Length Ratio:", "%.2f", PROJECTION_TRACE_ROW_FOCAL_LENGTH, C_BLUE, m_dFocalLengthRatio);
327 traceShowParam ("Field Of View Ratio:", "%.2f", PROJECTION_TRACE_ROW_FIELD_OF_VIEW, C_BLUE, m_dFieldOfViewRatio);
328 traceShowParam ("Num Detectors:", "%d", PROJECTION_TRACE_ROW_NDET, C_BLUE, proj.nDet());
329 traceShowParam ("Num Views:", "%d", PROJECTION_TRACE_ROW_NVIEW, C_BLUE, proj.nView());
330 traceShowParam ("Samples / Ray:", "%d", PROJECTION_TRACE_ROW_SAMPLES, C_BLUE, m_nSample);
332 m_pSGP->setMarker (SGP::MARK_BDIAMOND, C_LTGREEN);
337 if (m_pSGP && m_trace >= Trace::TRACE_PHANTOM) {
338 m_pSGP->setColor (C_BLACK);
339 m_pSGP->setPenWidth (2);
340 if (m_idGeometry == GEOMETRY_PARALLEL) {
341 m_pSGP->moveAbs (xs1, ys1);
342 m_pSGP->lineAbs (xs2, ys2);
343 m_pSGP->moveAbs (xd1, yd1);
344 m_pSGP->lineAbs (xd2, yd2);
345 } else if (m_idGeometry == GEOMETRY_EQUILINEAR) {
346 m_pSGP->setPenWidth (4);
347 m_pSGP->moveAbs (xs1, ys1);
348 m_pSGP->lineAbs (xs2, ys2);
349 m_pSGP->setPenWidth (2);
350 m_pSGP->moveAbs (xd1, yd1);
351 m_pSGP->lineAbs (xd2, yd2);
352 } else if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
353 m_pSGP->setPenWidth (4);
354 m_pSGP->moveAbs (xs1, ys1);
355 m_pSGP->lineAbs (xs2, ys2);
356 m_pSGP->setPenWidth (2);
357 m_pSGP->moveAbs (0., 0.);
358 m_pSGP->drawArc (m_dFocalLength, viewAngle + 3 * HALFPI - (m_dAngularDetLen/2), viewAngle + 3 * HALFPI + (m_dAngularDetLen/2));
360 m_pSGP->setPenWidth (1);
362 if (m_trace > Trace::TRACE_CONSOLE)
363 traceShowParam ("Current View:", "%d (%.0f%%)", PROJECTION_TRACE_ROW_CURR_VIEW, C_RED, iView + iStartView, (iView + iStartView) / static_cast<double>(m_nView) * 100.);
365 if (m_trace == Trace::TRACE_CONSOLE)
366 std::cout << "Current View: " << iView+iStartView << std::endl;
368 projectSingleView (phm, detArray, xd1, yd1, xd2, yd2, xs1, ys1, xs2, ys2, viewAngle + 3 * HALFPI);
369 detArray.setViewAngle (viewAngle);
372 if (m_pSGP && m_trace >= Trace::TRACE_PHANTOM) {
373 // rs_plot (detArray, xd1, yd1, dXCenter, dYCenter, theta);
376 xform_mtx2 (m_rotmtxIncrement, xs1, ys1);
377 xform_mtx2 (m_rotmtxIncrement, xs2, ys2);
378 if (m_idGeometry != GEOMETRY_EQUIANGULAR) {
379 xform_mtx2 (m_rotmtxIncrement, xd1, yd1); // rotate detector endpoints
380 xform_mtx2 (m_rotmtxIncrement, xd2, yd2);
382 } /* for each iView */
387 * rayview Calculate raysums for a view at any angle
390 * rayview (phm, detArray, xd1, nSample, yd1, xd2, yd2, xs1, ys1, xs2, ys2)
391 * Phantom& phm Phantom to scan
392 * DETARRAY *detArray Storage of values for detector array
393 * Scanner& det Scanner parameters
394 * double xd1, yd1, xd2, yd2 Beginning & ending detector positions
395 * double xs1, ys1, xs2, ys2 Beginning & ending source positions
398 * For each detector, have there are a variable number of rays traced.
399 * The source of each ray is the center of the source x-ray cell. The
400 * detector positions are equally spaced within the cell
402 * The increments between rays are calculated so that the cells start
403 * at the beginning of a detector cell and they end on the endpoint
404 * of the cell. Thus, the last cell starts at (xd2-ddx),(yd2-ddy).
405 * The exception to this is if there is only one ray per detector.
406 * In that case, the detector position is the center of the detector cell.
410 Scanner::projectSingleView (const Phantom& phm, DetectorArray& detArray, const double xd1, const double yd1, const double xd2, const double yd2, const double xs1, const double ys1, const double xs2, const double ys2, const double dDetAngle)
413 double sdx = (xs2 - xs1) / detArray.nDet(); // change in coords
414 double sdy = (ys2 - ys1) / detArray.nDet(); // between source
415 double xs_maj = xs1 + (sdx / 2); // put ray source in center of cell
416 double ys_maj = ys1 + (sdy / 2);
418 double ddx=0, ddy=0, ddx2=0, ddy2=0, ddx2_ofs=0, ddy2_ofs=0, xd_maj=0, yd_maj=0;
419 double dAngleInc=0, dAngleSampleInc=0, dAngleSampleOffset=0, dAngleMajor=0;
420 if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
421 dAngleInc = m_dAngularDetIncrement;
422 dAngleSampleInc = dAngleInc / m_nSample;
423 dAngleSampleOffset = dAngleSampleInc / 2;
424 dAngleMajor = dDetAngle - (m_dAngularDetLen/2) + dAngleSampleOffset;
426 ddx = (xd2 - xd1) / detArray.nDet(); // change in coords
427 ddy = (yd2 - yd1) / detArray.nDet(); // between detectors
428 ddx2 = ddx / m_nSample; // Incr. between rays with detector cell
429 ddy2 = ddy / m_nSample; // Doesn't include detector endpoints
430 ddx2_ofs = ddx2 / 2; // offset of 1st ray from start of detector cell
433 xd_maj = xd1 + ddx2_ofs; // Incr. between detector cells
434 yd_maj = yd1 + ddy2_ofs;
437 DetectorValue* detval = detArray.detValues();
439 if (phm.getComposition() == P_UNIT_PULSE) { // put unit pulse in center of view
440 for (int d = 0; d < detArray.nDet(); d++)
441 if (detArray.nDet() / 2 == d && (d % 2) == 1)
446 for (int d = 0; d < detArray.nDet(); d++) {
449 double xd=0, yd=0, dAngle=0;
450 if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
451 dAngle = dAngleMajor;
457 for (unsigned int i = 0; i < m_nSample; i++) {
458 if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
459 xd = m_dFocalLength * cos (dAngle);
460 yd = m_dFocalLength * sin (dAngle);
464 if (m_pSGP && m_trace >= Trace::TRACE_PROJECTIONS) {
465 m_pSGP->setColor (C_YELLOW);
466 m_pSGP->setRasterOp (RO_AND);
467 m_pSGP->moveAbs (xs, ys);
468 m_pSGP->lineAbs (xd, yd);
472 sum += projectSingleLine (phm, xd, yd, xs, ys);
475 // if (m_trace >= Trace::TRACE_CLIPPING) {
476 // traceShowParam ("Attenuation:", "%s", PROJECTION_TRACE_ROW_ATTEN, C_LTMAGENTA, " ");
477 // traceShowParam ("Attenuation:", "%.3f", PROJECTION_TRACE_ROW_ATTEN, C_LTMAGENTA, sum);
480 if (m_idGeometry == GEOMETRY_EQUIANGULAR)
481 dAngle += dAngleSampleInc;
486 } // for each sample in detector
488 detval[d] = sum / m_nSample;
491 if (m_idGeometry == GEOMETRY_EQUIANGULAR)
492 dAngleMajor += dAngleInc;
497 } /* for each detector */
498 } /* if not unit pulse */
503 Scanner::traceShowParam (const char *szLabel, const char *fmt, int row, int color, ...)
506 va_start(arg, color);
508 traceShowParamRasterOp (RO_COPY, szLabel, fmt, row, color, arg);
510 traceShowParamRasterOp (0, szLabel, fmt, row, color, arg);
516 Scanner::traceShowParamXOR (const char *szLabel, const char *fmt, int row, int color, ...)
519 va_start(arg, color);
521 traceShowParamRasterOp (RO_XOR, szLabel, fmt, row, color, arg);
523 traceShowParamRasterOp (0, szLabel, fmt, row, color, arg);
529 Scanner::traceShowParamRasterOp (int iRasterOp, const char *szLabel, const char *fmt, int row, int color, va_list args)
533 vsnprintf (szValue, sizeof(szValue), fmt, args);
537 m_pSGP->setRasterOp (iRasterOp);
538 double dYPos = m_dYMaxWin - (row * m_dTextHeight);
539 m_pSGP->moveAbs (m_dXMinWin, dYPos);
540 m_pSGP->setTextColor (color, -1);
541 m_pSGP->drawText (szLabel);
542 double dValueOffset = (m_dXMaxWin - m_dXMinWin) / 4;
543 m_pSGP->moveAbs (m_dXMinWin + dValueOffset, dYPos);
544 m_pSGP->drawText (szValue);
548 cio_put_str (szLabel);
549 cio_put_str (szValue);
557 * projectSingleLine INTERNAL: Calculates raysum along a line for a Phantom
560 * rsum = phm_ray_attenuation (phm, x1, y1, x2, y2)
561 * double rsum Ray sum of Phantom along given line
562 * Phantom& phm; Phantom from which to calculate raysum
563 * double *x1, *y1, *x2, y2 Endpoints of ray path (in Phantom coords)
567 Scanner::projectSingleLine (const Phantom& phm, const double x1, const double y1, const double x2, const double y2)
569 // check ray against each pelem in Phantom
571 for (PElemConstIterator i = phm.listPElem().begin(); i != phm.listPElem().end(); i++)
572 rsum += projectLineAgainstPElem (**i, x1, y1, x2, y2);
579 * pelem_ray_attenuation Calculate raysum of an pelem along one line
582 * rsum = pelem_ray_attenuation (pelem, x1, y1, x2, y2)
583 * double rsum Computed raysum
584 * PhantomElement& pelem Pelem to scan
585 * double x1, y1, x2, y2 Endpoints of raysum line
589 Scanner::projectLineAgainstPElem (const PhantomElement& pelem, double x1, double y1, double x2, double y2)
591 if (! pelem.clipLineWorldCoords (x1, y1, x2, y2)) {
592 if (m_trace == Trace::TRACE_CLIPPING)
593 cio_tone (1000., 0.05);
598 if (m_pSGP && m_trace == Trace::TRACE_CLIPPING) {
599 m_pSGP->setRasterOp (RO_XOR);
600 m_pSGP->moveAbs (x1, y1);
601 m_pSGP->lineAbs (x2, y2);
602 cio_tone (8000., 0.05);
603 m_pSGP->moveAbs (x1, y1);
604 m_pSGP->lineAbs (x2, y2);
605 m_pSGP->setRasterOp (RO_SET);
609 double len = lineLength (x1, y1, x2, y2);
610 return (len * pelem.atten());