1 /*****************************************************************************
5 ** Purpose: Classes for CT scanner
6 ** Programmer: Kevin Rosenberg
9 ** This is part of the CTSim program
10 ** Copyright (c) 1983-2001 Kevin Rosenberg
12 ** $Id: scanner.cpp,v 1.28 2001/02/02 00:46:38 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 dAngle1 = atan ((m_dFieldOfView / 2) / m_dFocalLength);
137 double dHalfSquare = m_dFieldOfView / SQRT2 / 2;
138 double dFocalPastPhm = m_dFocalLength - dHalfSquare;
139 if (dFocalPastPhm <= 0.) {
141 m_failMessage = "Focal Point inside of phantom";
144 double dAngle2 = atan( dHalfSquare / dFocalPastPhm );
145 double dAngle = maxValue<double> (dAngle1, dAngle2);
147 double dAngle = (m_dFieldOfView / 2) / cos (asin (m_dFieldOfView / 2 / m_dFocalLength));
150 double dHalfDetLen = 2 * m_dFocalLength * tan (dAngle);
152 m_detLen = dHalfDetLen * 2;
153 m_detInc = m_detLen / m_nDet;
154 if (m_nDet % 2 == 0) // Adjust for Even number of detectors
155 m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)-1
157 m_initPos.angle = 0.0;
158 m_initPos.xs1 = m_dXCenter;
159 m_initPos.ys1 = m_dYCenter + m_dFocalLength;
160 m_initPos.xs2 = m_dXCenter;
161 m_initPos.ys2 = m_dYCenter + m_dFocalLength;
162 m_initPos.xd1 = m_dXCenter - dHalfDetLen;
163 m_initPos.yd1 = m_dYCenter - m_dFocalLength;
164 m_initPos.xd2 = m_dXCenter + dHalfDetLen;
165 m_initPos.yd2 = m_dYCenter - m_dFocalLength;
166 m_initPos.angle = 0.0;
167 } else if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
168 double dAngle1 = atan ((m_dFieldOfView / 2) / m_dFocalLength);
170 double dHalfSquare = m_dFieldOfView / SQRT2 / 2;
171 double dFocalPastPhm = m_dFocalLength - dHalfSquare;
172 if (dFocalPastPhm <= 0.) {
174 m_failMessage = "Focal Point inside of phantom";
177 double dAngle2 = atan ( dHalfSquare / dFocalPastPhm );
178 double dAngle = maxValue<double> (dAngle1, dAngle2);
180 m_detLen = 2 * dAngle;
181 m_detInc = m_detLen / m_nDet;
182 if (m_nDet % 2 == 0) // Adjust for Even number of detectors
183 m_detInc = m_detLen / (m_nDet - 1); // center detector = (nDet/2)-1
184 m_dAngularDetIncrement = m_detInc * 2; // Angular Position 2x gamma angle
185 m_dAngularDetLen = m_detLen * 2;
186 m_initPos.dAngularDet = -m_dAngularDetLen / 2;
189 m_initPos.xs1 = m_dXCenter;
190 m_initPos.ys1 = m_dYCenter + m_dFocalLength;;
191 m_initPos.xs2 = m_dXCenter;
192 m_initPos.ys2 = m_dYCenter + m_dFocalLength;
195 // Calculate incrementatal rotation matrix
197 xlat_mtx2 (m_rotmtxIncrement, -m_dXCenter, -m_dYCenter);
198 rot_mtx2 (temp, m_rotInc);
199 mult_mtx2 (m_rotmtxIncrement, temp, m_rotmtxIncrement);
200 xlat_mtx2 (temp, m_dXCenter, m_dYCenter);
201 mult_mtx2 (m_rotmtxIncrement, temp, m_rotmtxIncrement);
205 Scanner::~Scanner (void)
211 Scanner::convertGeometryIDToName (const int geomID)
213 const char *name = "";
215 if (geomID >= 0 && geomID < s_iGeometryCount)
216 return (s_aszGeometryName[geomID]);
222 Scanner::convertGeometryIDToTitle (const int geomID)
224 const char *title = "";
226 if (geomID >= 0 && geomID < s_iGeometryCount)
227 return (s_aszGeometryName[geomID]);
233 Scanner::convertGeometryNameToID (const char* const geomName)
235 int id = GEOMETRY_INVALID;
237 for (int i = 0; i < s_iGeometryCount; i++)
238 if (strcasecmp (geomName, s_aszGeometryName[i]) == 0) {
248 * collectProjections Calculate projections for a Phantom
251 * collectProjections (proj, phm, start_view, nView, bStoreViewPos, trace)
252 * Projectrions& proj Projection storage
253 * Phantom& phm Phantom for which we collect projections
254 * bool bStoreViewPos TRUE then storage proj at normal view position
255 * int trace Trace level
260 Scanner::collectProjections (Projections& proj, const Phantom& phm, const int trace, SGP* pSGP)
262 collectProjections (proj, phm, 0, proj.nView(), true, trace, pSGP);
266 Scanner::collectProjections (Projections& proj, const Phantom& phm, const int iStartView, const int iNumViews, bool bStoreAtViewPosition, const int trace, SGP* pSGP)
269 double start_angle = iStartView * proj.rotInc();
271 // Calculate initial rotation matrix
272 GRFMTX_2D rotmtx_initial, temp;
273 xlat_mtx2 (rotmtx_initial, -m_dXCenter, -m_dYCenter);
274 rot_mtx2 (temp, start_angle);
275 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
276 xlat_mtx2 (temp, m_dXCenter, m_dYCenter);
277 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
279 double xd1=0, yd1=0, xd2=0, yd2=0;
280 if (m_idGeometry != GEOMETRY_EQUIANGULAR) {
285 xform_mtx2 (rotmtx_initial, xd1, yd1); // rotate detector endpoints
286 xform_mtx2 (rotmtx_initial, xd2, yd2); // to initial view_angle
289 double xs1 = m_initPos.xs1;
290 double ys1 = m_initPos.ys1;
291 double xs2 = m_initPos.xs2;
292 double ys2 = m_initPos.ys2;
293 xform_mtx2 (rotmtx_initial, xs1, ys1); // rotate source endpoints to
294 xform_mtx2 (rotmtx_initial, xs2, ys2); // initial view angle
298 for (iView = 0, viewAngle = start_angle; iView < iNumViews; iView++, viewAngle += proj.rotInc()) {
299 int iStoragePosition = iView;
300 if (bStoreAtViewPosition)
301 iStoragePosition += iStartView;
303 DetectorArray& detArray = proj.getDetectorArray( iStoragePosition );
306 if (pSGP && m_trace >= Trace::TRACE_PHANTOM) {
308 double dWindowSize = dmax (m_detLen, m_dFocalLength * 2) * SQRT2;
309 double dHalfWindowSize = dWindowSize / 2;
310 m_dXMinWin = m_dXCenter - dHalfWindowSize;
311 m_dXMaxWin = m_dXCenter + dHalfWindowSize;
312 m_dYMinWin = m_dYCenter - dHalfWindowSize;
313 m_dYMaxWin = m_dYCenter + dHalfWindowSize;
314 double dHalfPhmLen = m_phmLen / 2;
316 m_pSGP->setWindow (m_dXMinWin, m_dYMinWin, m_dXMaxWin, m_dYMaxWin);
317 m_pSGP->setRasterOp (RO_COPY);
318 m_pSGP->setColor (C_RED);
319 m_pSGP->moveAbs (0., 0.);
320 m_pSGP->drawRect (m_dXCenter - dHalfPhmLen, m_dYCenter - dHalfPhmLen, m_dXCenter + dHalfPhmLen, m_dYCenter + dHalfPhmLen);
321 m_pSGP->moveAbs (0., 0.);
322 m_pSGP->drawCircle (m_dFocalLength);
323 m_pSGP->setColor (C_BLUE);
324 m_pSGP->setTextPointSize (9);
326 m_dTextHeight = m_pSGP->getCharHeight ();
328 traceShowParam ("Phantom:", "%s", PROJECTION_TRACE_ROW_PHANT_ID, C_BLACK, phm.name().c_str());
329 traceShowParam ("Geometry:", "%s", PROJECTION_TRACE_ROW_GEOMETRY, C_BLUE, convertGeometryIDToName(m_idGeometry));
330 traceShowParam ("Focal Length Ratio:", "%.2f", PROJECTION_TRACE_ROW_FOCAL_LENGTH, C_BLUE, m_dFocalLengthRatio);
331 traceShowParam ("Field Of View Ratio:", "%.2f", PROJECTION_TRACE_ROW_FIELD_OF_VIEW, C_BLUE, m_dFieldOfViewRatio);
332 traceShowParam ("Num Detectors:", "%d", PROJECTION_TRACE_ROW_NDET, C_BLUE, proj.nDet());
333 traceShowParam ("Num Views:", "%d", PROJECTION_TRACE_ROW_NVIEW, C_BLUE, proj.nView());
334 traceShowParam ("Samples / Ray:", "%d", PROJECTION_TRACE_ROW_SAMPLES, C_BLUE, m_nSample);
336 m_pSGP->setMarker (SGP::MARK_BDIAMOND, C_LTGREEN);
341 if (m_pSGP && m_trace >= Trace::TRACE_PHANTOM) {
342 m_pSGP->setColor (C_BLACK);
343 m_pSGP->setPenWidth (2);
344 if (m_idGeometry == GEOMETRY_PARALLEL) {
345 m_pSGP->moveAbs (xs1, ys1);
346 m_pSGP->lineAbs (xs2, ys2);
347 m_pSGP->moveAbs (xd1, yd1);
348 m_pSGP->lineAbs (xd2, yd2);
349 } else if (m_idGeometry == GEOMETRY_EQUILINEAR) {
350 m_pSGP->setPenWidth (4);
351 m_pSGP->moveAbs (xs1, ys1);
352 m_pSGP->lineAbs (xs2, ys2);
353 m_pSGP->setPenWidth (2);
354 m_pSGP->moveAbs (xd1, yd1);
355 m_pSGP->lineAbs (xd2, yd2);
356 } else if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
357 m_pSGP->setPenWidth (4);
358 m_pSGP->moveAbs (xs1, ys1);
359 m_pSGP->lineAbs (xs2, ys2);
360 m_pSGP->setPenWidth (2);
361 m_pSGP->moveAbs (0., 0.);
362 m_pSGP->drawArc (m_dFocalLength, viewAngle + 3 * HALFPI - (m_dAngularDetLen/2), viewAngle + 3 * HALFPI + (m_dAngularDetLen/2));
364 m_pSGP->setPenWidth (1);
366 if (m_trace > Trace::TRACE_CONSOLE)
367 traceShowParam ("Current View:", "%d (%.0f%%)", PROJECTION_TRACE_ROW_CURR_VIEW, C_RED, iView + iStartView, (iView + iStartView) / static_cast<double>(m_nView) * 100.);
369 if (m_trace == Trace::TRACE_CONSOLE)
370 std::cout << "Current View: " << iView+iStartView << std::endl;
372 projectSingleView (phm, detArray, xd1, yd1, xd2, yd2, xs1, ys1, xs2, ys2, viewAngle + 3 * HALFPI);
373 detArray.setViewAngle (viewAngle);
376 if (m_pSGP && m_trace >= Trace::TRACE_PHANTOM) {
377 // rs_plot (detArray, xd1, yd1, dXCenter, dYCenter, theta);
380 xform_mtx2 (m_rotmtxIncrement, xs1, ys1);
381 xform_mtx2 (m_rotmtxIncrement, xs2, ys2);
382 if (m_idGeometry != GEOMETRY_EQUIANGULAR) {
383 xform_mtx2 (m_rotmtxIncrement, xd1, yd1); // rotate detector endpoints
384 xform_mtx2 (m_rotmtxIncrement, xd2, yd2);
386 } /* for each iView */
391 * rayview Calculate raysums for a view at any angle
394 * rayview (phm, detArray, xd1, nSample, yd1, xd2, yd2, xs1, ys1, xs2, ys2)
395 * Phantom& phm Phantom to scan
396 * DETARRAY *detArray Storage of values for detector array
397 * Scanner& det Scanner parameters
398 * double xd1, yd1, xd2, yd2 Beginning & ending detector positions
399 * double xs1, ys1, xs2, ys2 Beginning & ending source positions
402 * For each detector, have there are a variable number of rays traced.
403 * The source of each ray is the center of the source x-ray cell. The
404 * detector positions are equally spaced within the cell
406 * The increments between rays are calculated so that the cells start
407 * at the beginning of a detector cell and they end on the endpoint
408 * of the cell. Thus, the last cell starts at (xd2-ddx),(yd2-ddy).
409 * The exception to this is if there is only one ray per detector.
410 * In that case, the detector position is the center of the detector cell.
414 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)
417 double sdx = (xs2 - xs1) / detArray.nDet(); // change in coords
418 double sdy = (ys2 - ys1) / detArray.nDet(); // between source
419 double xs_maj = xs1 + (sdx / 2); // put ray source in center of cell
420 double ys_maj = ys1 + (sdy / 2);
422 double ddx=0, ddy=0, ddx2=0, ddy2=0, ddx2_ofs=0, ddy2_ofs=0, xd_maj=0, yd_maj=0;
423 double dAngleInc=0, dAngleSampleInc=0, dAngleSampleOffset=0, dAngleMajor=0;
424 if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
425 dAngleInc = m_dAngularDetIncrement;
426 dAngleSampleInc = dAngleInc / m_nSample;
427 dAngleSampleOffset = dAngleSampleInc / 2;
428 dAngleMajor = dDetAngle - (m_dAngularDetLen/2) + dAngleSampleOffset;
430 ddx = (xd2 - xd1) / detArray.nDet(); // change in coords
431 ddy = (yd2 - yd1) / detArray.nDet(); // between detectors
432 ddx2 = ddx / m_nSample; // Incr. between rays with detector cell
433 ddy2 = ddy / m_nSample; // Doesn't include detector endpoints
434 ddx2_ofs = ddx2 / 2; // offset of 1st ray from start of detector cell
437 xd_maj = xd1 + ddx2_ofs; // Incr. between detector cells
438 yd_maj = yd1 + ddy2_ofs;
441 DetectorValue* detval = detArray.detValues();
443 if (phm.getComposition() == P_UNIT_PULSE) { // put unit pulse in center of view
444 for (int d = 0; d < detArray.nDet(); d++)
445 if (detArray.nDet() / 2 == d && (d % 2) == 1)
450 for (int d = 0; d < detArray.nDet(); d++) {
453 double xd=0, yd=0, dAngle=0;
454 if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
455 dAngle = dAngleMajor;
461 for (unsigned int i = 0; i < m_nSample; i++) {
462 if (m_idGeometry == GEOMETRY_EQUIANGULAR) {
463 xd = m_dFocalLength * cos (dAngle);
464 yd = m_dFocalLength * sin (dAngle);
468 if (m_pSGP && m_trace >= Trace::TRACE_PROJECTIONS) {
469 m_pSGP->setColor (C_YELLOW);
470 m_pSGP->setRasterOp (RO_AND);
471 m_pSGP->moveAbs (xs, ys);
472 m_pSGP->lineAbs (xd, yd);
476 sum += projectSingleLine (phm, xd, yd, xs, ys);
479 // if (m_trace >= Trace::TRACE_CLIPPING) {
480 // traceShowParam ("Attenuation:", "%s", PROJECTION_TRACE_ROW_ATTEN, C_LTMAGENTA, " ");
481 // traceShowParam ("Attenuation:", "%.3f", PROJECTION_TRACE_ROW_ATTEN, C_LTMAGENTA, sum);
484 if (m_idGeometry == GEOMETRY_EQUIANGULAR)
485 dAngle += dAngleSampleInc;
490 } // for each sample in detector
492 detval[d] = sum / m_nSample;
495 if (m_idGeometry == GEOMETRY_EQUIANGULAR)
496 dAngleMajor += dAngleInc;
501 } /* for each detector */
502 } /* if not unit pulse */
507 Scanner::traceShowParam (const char *szLabel, const char *fmt, int row, int color, ...)
510 va_start(arg, color);
512 traceShowParamRasterOp (RO_COPY, szLabel, fmt, row, color, arg);
514 traceShowParamRasterOp (0, szLabel, fmt, row, color, arg);
520 Scanner::traceShowParamXOR (const char *szLabel, const char *fmt, int row, int color, ...)
523 va_start(arg, color);
525 traceShowParamRasterOp (RO_XOR, szLabel, fmt, row, color, arg);
527 traceShowParamRasterOp (0, szLabel, fmt, row, color, arg);
533 Scanner::traceShowParamRasterOp (int iRasterOp, const char *szLabel, const char *fmt, int row, int color, va_list args)
537 vsnprintf (szValue, sizeof(szValue), fmt, args);
541 m_pSGP->setRasterOp (iRasterOp);
542 m_pSGP->setTextColor (color, -1);
543 double dValueOffset = (m_dXMaxWin - m_dXMinWin) / 4;
545 double dYPos = m_dYMaxWin - (row * m_dTextHeight);
546 double dXPos = m_dXMinWin;
547 m_pSGP->moveAbs (dXPos, dYPos);
548 m_pSGP->drawText (szLabel);
549 m_pSGP->moveAbs (dXPos + dValueOffset, dYPos);
550 m_pSGP->drawText (szValue);
553 double dYPos = m_dYMaxWin - (row * m_dTextHeight);
554 double dXPos = m_dXMinWin + (m_dXMaxWin - m_dXMinWin) * 0.5;
555 m_pSGP->moveAbs (dXPos, dYPos);
556 m_pSGP->drawText (szLabel);
557 m_pSGP->moveAbs (dXPos + dValueOffset, dYPos);
558 m_pSGP->drawText (szValue);
563 cio_put_str (szLabel);
564 cio_put_str (szValue);
572 * projectSingleLine INTERNAL: Calculates raysum along a line for a Phantom
575 * rsum = phm_ray_attenuation (phm, x1, y1, x2, y2)
576 * double rsum Ray sum of Phantom along given line
577 * Phantom& phm; Phantom from which to calculate raysum
578 * double *x1, *y1, *x2, y2 Endpoints of ray path (in Phantom coords)
582 Scanner::projectSingleLine (const Phantom& phm, const double x1, const double y1, const double x2, const double y2)
584 // check ray against each pelem in Phantom
586 for (PElemConstIterator i = phm.listPElem().begin(); i != phm.listPElem().end(); i++)
587 rsum += projectLineAgainstPElem (**i, x1, y1, x2, y2);
594 * pelem_ray_attenuation Calculate raysum of an pelem along one line
597 * rsum = pelem_ray_attenuation (pelem, x1, y1, x2, y2)
598 * double rsum Computed raysum
599 * PhantomElement& pelem Pelem to scan
600 * double x1, y1, x2, y2 Endpoints of raysum line
604 Scanner::projectLineAgainstPElem (const PhantomElement& pelem, double x1, double y1, double x2, double y2)
606 if (! pelem.clipLineWorldCoords (x1, y1, x2, y2)) {
607 if (m_trace == Trace::TRACE_CLIPPING)
608 cio_tone (1000., 0.05);
613 if (m_pSGP && m_trace == Trace::TRACE_CLIPPING) {
614 m_pSGP->setRasterOp (RO_XOR);
615 m_pSGP->moveAbs (x1, y1);
616 m_pSGP->lineAbs (x2, y2);
617 cio_tone (8000., 0.05);
618 m_pSGP->moveAbs (x1, y1);
619 m_pSGP->lineAbs (x2, y2);
620 m_pSGP->setRasterOp (RO_SET);
624 double len = lineLength (x1, y1, x2, y2);
625 return (len * pelem.atten());