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 1.7 2000/07/29 19:50:08 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_EQUILINEAR = 1;
34 const int Scanner::GEOMETRY_EQUIANGULAR = 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)
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;
105 ++nDet; // ensure odd number of detectors
110 m_detLen = SQRT2 * m_phmLen * ((m_nDet + N_EXTRA_DETECTORS) / static_cast<double>(m_nDet));
112 m_rotLen = rot_anglen;
114 m_radius = m_detLen / 2;
115 m_detInc = m_detLen / m_nDet;
116 m_rotInc = m_rotLen / m_nView;
118 m_initPos.xd1 = m_detLen / 2;
119 m_initPos.yd1 = -m_detLen / 2;
120 m_initPos.xd2 = m_detLen / 2;
121 m_initPos.yd2 = m_detLen / 2;
122 m_initPos.xs1 = -m_detLen / 2;
123 m_initPos.ys1 = -m_detLen / 2;
124 m_initPos.xs2 = -m_detLen / 2;
125 m_initPos.ys2 = m_detLen / 2;
126 m_initPos.angle = 0.0;
129 Scanner::~Scanner (void)
135 Scanner::convertGeometryIDToName (const int geomID)
137 const char *name = "";
139 if (geomID >= 0 && geomID < s_iGeometryCount)
140 return (s_aszGeometryName[geomID]);
146 Scanner::convertGeometryIDToTitle (const int geomID)
148 const char *title = "";
150 if (geomID >= 0 && geomID < s_iGeometryCount)
151 return (s_aszGeometryName[geomID]);
157 Scanner::convertGeometryNameToID (const char* const geomName)
159 int id = GEOMETRY_INVALID;
161 for (int i = 0; i < s_iGeometryCount; i++)
162 if (strcasecmp (geomName, s_aszGeometryName[i]) == 0) {
172 * raysum_collect Calculate ray sums for a Phantom
175 * rs = raysum_collect (det, phm, start_view, trace, unit_pulse)
176 * Scanner& det Scanner specifications**
177 * RAYSUM *rs Calculated ray sum matrix
178 * Phantom& phm Phantom we are taking ray sums of
179 * int trace Boolean flag to signal ray sum tracing
183 Scanner::collectProjections (Projections& proj, const Phantom& phm, const int start_view, const int trace = TRACE_NONE, SGP* pSGP = NULL)
185 GRFMTX_2D rotmtx_initial, temp;
186 GRFMTX_2D rotmtx_incr;
188 double start_angle = start_view * proj.rotInc();
189 double xcent = phm.xmin() + (phm.xmax() - phm.xmin()) / 2;
190 double ycent = phm.ymin() + (phm.ymax() - phm.ymin()) / 2;
192 double xd1 = xcent + m_initPos.xd1;
193 double yd1 = ycent + m_initPos.yd1;
194 double xd2 = xcent + m_initPos.xd2;
195 double yd2 = ycent + m_initPos.yd2;
196 double xs1 = xcent + m_initPos.xs1;
197 double ys1 = ycent + m_initPos.ys1;
198 double xs2 = xcent + m_initPos.xs2;
199 double ys2 = ycent + m_initPos.ys2;
204 if (pSGP && m_trace >= TRACE_PHM) {
205 double wsize = 1.42 * m_phmLen / 2; /* sqrt(2) * radius */
207 pSGP->setColor (C_LTBLUE);
208 pSGP->setWindow (xcent - wsize, ycent - wsize, xcent + wsize, ycent + wsize);
209 pSGP->setColor (C_BROWN);
211 pSGP->drawCircle (m_phmLen / 2);
213 pSGP->drawRect (xcent - m_phmLen / 2, ycent - m_phmLen / 2,
214 xcent + m_phmLen / 2, ycent + m_phmLen / 2);
216 pSGP->setColor (C_BROWN);
217 pSGP->moveAbs (0., 0.);
218 pSGP->drawCircle (wsize);
219 // raysum_trace_menu_column = (crt->xsize * crt->asp) / 8 + 3;
220 traceShowParam ("X-Ray Simulator", "%s", RAYSUM_TRACE_ROW_TITLE, C_BLACK, " ");
221 traceShowParam ("---------------", "%s", RAYSUM_TRACE_ROW_TITLE2, C_BLACK, " ");
222 traceShowParam ("Phantom:", "%s", RAYSUM_TRACE_ROW_PHANT_ID, C_YELLOW, " Herman");
223 traceShowParam ("Chomaticity :", "%s", RAYSUM_TRACE_ROW_CHROMATIC, C_LTGREEN, "Mono");
224 traceShowParam ("Scatter :", "%5.1f", RAYSUM_TRACE_ROW_SCATTER, C_LTGREEN, 0.);
225 traceShowParam ("Photon Uncert:", "%5.1f", RAYSUM_TRACE_ROW_PHOT_STAT, C_LTGREEN, 0.);
226 traceShowParam ("Num Scanners:", "%5d", RAYSUM_TRACE_ROW_NDET, C_LTRED, proj.nDet());
227 traceShowParam ("Num Views :", "%5d", RAYSUM_TRACE_ROW_NVIEW, C_LTRED, proj.nView());
228 traceShowParam ("Samples / Ray:", "%5d", RAYSUM_TRACE_ROW_SAMPLES, C_LTRED, m_nSample);
230 pSGP->setColor (C_LTGREEN);
233 pSGP->setMarker (SGP::MARK_BDIAMOND, C_LTGREEN);
237 /* Calculate initial rotation matrix */
238 xlat_mtx2 (rotmtx_initial, -xcent, -ycent);
239 rot_mtx2 (temp, start_angle);
240 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
241 xlat_mtx2 (temp, xcent, ycent);
242 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
244 xform_mtx2 (rotmtx_initial, xd1, yd1); /* rotate detector endpoints */
245 xform_mtx2 (rotmtx_initial, xd2, yd2); /* to initial view_angle */
246 xform_mtx2 (rotmtx_initial, xs1, ys1);
247 xform_mtx2 (rotmtx_initial, xs2, ys2);
249 /* Calculate incrementatal rotation matrix */
250 xlat_mtx2 (rotmtx_incr, -xcent, -ycent);
251 rot_mtx2 (temp, proj.rotInc());
252 mult_mtx2 (rotmtx_incr, temp, rotmtx_incr);
253 xlat_mtx2 (temp, xcent, ycent);
254 mult_mtx2 (rotmtx_incr, temp, rotmtx_incr);
258 for (iview = 0, viewAngle = start_angle; iview < proj.nView(); iview++, viewAngle += proj.rotInc()) {
259 DetectorArray& detArray = proj.getDetectorArray( iview );
262 if (pSGP && m_trace >= TRACE_PHM) {
263 pSGP->moveAbs (xd1, yd1);
264 pSGP->lineAbs (xd2, yd2);
265 pSGP->moveAbs (xs1, ys1);
266 pSGP->lineAbs (xs2, ys2);
270 traceShowParam ("Current View :", "%5d", RAYSUM_TRACE_ROW_CURR_VIEW, C_LTMAGENTA, iview);
272 projectSingleView (phm, detArray, xd1, yd1, xd2, yd2, xs1, ys1, xs2, ys2, pSGP);
273 detArray.setViewAngle (viewAngle);
276 if (pSGP && m_trace >= TRACE_PHM) {
277 // rs_plot (detArray, xd1, yd1, xcent, ycent, theta);
278 pSGP->moveAbs (xd1, yd1);
279 pSGP->lineAbs (xd2, yd2);
280 pSGP->moveAbs (xs1, ys1);
281 pSGP->lineAbs (xs2, ys2);
284 xform_mtx2 (rotmtx_incr, xd1, yd1); // rotate detector endpoints
285 xform_mtx2 (rotmtx_incr, xd2, yd2);
286 xform_mtx2 (rotmtx_incr, xs1, ys1);
287 xform_mtx2 (rotmtx_incr, xs2, ys2);
288 } /* for each iview */
293 * rayview Calculate raysums for a view at any angle
296 * rayview (phm, detArray, xd1, nSample, yd1, xd2, yd2, xs1, ys1, xs2, ys2)
297 * Phantom& phm Phantom to scan
298 * DETARRAY *detArray Storage of values for detector array
299 * Scanner& det Scanner parameters
300 * double xd1, yd1, xd2, yd2 Beginning & ending detector positions
301 * double xs1, ys1, xs2, ys2 Beginning & ending source positions
304 * For each detector, have there are a variable number of rays traced.
305 * The source of each ray is the center of the source x-ray cell. The
306 * detector positions are equally spaced within the cell
308 * The increments between rays are calculated so that the cells start
309 * at the beginning of a detector cell and they end on the endpoint
310 * of the cell. Thus, the last cell starts at (xd2-ddx),(yd2-ddy).
311 * The exception to this is if there is only one ray per detector.
312 * In that case, the detector position is the center of the detector cell.
316 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, SGP* pSGP)
318 double ddx = (xd2 - xd1) / detArray.nDet(); // change in coords between detectors
319 double ddy = (yd2 - yd1) / detArray.nDet();
320 double sdx = (xs2 - xs1) / detArray.nDet(); // change in coords between source
321 double sdy = (ys2 - ys1) / detArray.nDet();
323 double ddx2 = ddx / m_nSample; // Incr. between rays with detector cell
324 double ddy2 = ddy / m_nSample; // Doesn't include detector endpoints
325 double ddx2_ofs = ddx2 / 2; // offset of 1st ray from start of detector cell
326 double ddy2_ofs = ddy2 / 2;
328 double xd_maj = xd1 + ddx2_ofs; // Incr. between detector cells
329 double yd_maj = yd1 + ddy2_ofs;
330 double xs_maj = xs1 + (sdx / 2); // put ray source in center of cell
331 double ys_maj = ys1 + (sdy / 2);
333 DetectorValue* detval = detArray.detValues();
335 if (phm.getComposition() == P_UNIT_PULSE) { // put unit pulse in center of view
336 for (int d = 0; d < detArray.nDet(); d++)
337 if (detArray.nDet() / 2 == d && (d % 2) == 1)
342 for (int d = 0; d < detArray.nDet(); d++) {
348 for (unsigned int i = 0; i < m_nSample; i++) {
350 if (pSGP && m_trace >= TRACE_RAYS) {
351 pSGP->moveAbs (xs, ys);
352 pSGP->lineAbs (xd, yd);
355 sum += projectSingleLine (phm, xd, yd, xs, ys, pSGP);
357 if (m_trace >= TRACE_RAYS)
358 traceShowParam ("Attenuation :", "%5.2f", RAYSUM_TRACE_ROW_ATTEN, C_LTMAGENTA, "sum");
361 if (pSGP && m_trace >= TRACE_RAYS) {
362 pSGP->moveAbs (xs, ys);
363 pSGP->lineAbs (xd, yd);
370 detval[d] = sum / m_nSample;
375 } /* for each detector */
376 } /* if not unit pulse */
381 Scanner::traceShowParam (const char *label, const char *fmt, int row, int color, ...)
386 va_start(arg, color);
387 // cio_set_cpos (raysum_trace_menu_column, row);
388 snprintf (s, sizeof(s), label, "%s");
389 // cio_set_text_clr (color - 8, 0);
391 vsnprintf (s, sizeof(s), fmt, arg);
392 // cio_set_text_clr (color, 0);
400 * projectSingleLine INTERNAL: Calculates raysum along a line for a Phantom
403 * rsum = phm_ray_attenuation (phm, x1, y1, x2, y2)
404 * double rsum Ray sum of Phantom along given line
405 * Phantom& phm; Phantom from which to calculate raysum
406 * double *x1, *y1, *x2, y2 Endpoints of ray path (in Phantom coords)
410 Scanner::projectSingleLine (const Phantom& phm, const double x1, const double y1, const double x2, const double y2, SGP* pSGP)
412 // check ray against each pelem in Phantom
414 for (PElemConstIterator i = phm.listPElem().begin(); i != phm.listPElem().end(); i++)
415 rsum += projectLineAgainstPElem (**i, x1, y1, x2, y2, pSGP);
422 * pelem_ray_attenuation Calculate raysum of an pelem along one line
425 * rsum = pelem_ray_attenuation (pelem, x1, y1, x2, y2)
426 * double rsum Computed raysum
427 * PhantomElement& pelem Pelem to scan
428 * double x1, y1, x2, y2 Endpoints of raysum line
432 Scanner::projectLineAgainstPElem (const PhantomElement& pelem, double x1, double y1, double x2, double y2, SGP* pSGP)
434 if (! pelem.clipLineWorldCoords (x1, y1, x2, y2)) {
435 if (m_trace == TRACE_CLIPPING)
436 cio_tone (1000., 0.05);
441 if (pSGP && m_trace == TRACE_CLIPPING) {
442 pSGP->moveAbs (x1, y1);
443 pSGP->lineAbs (x2, y2);
444 cio_tone (8000., 0.05);
445 pSGP->moveAbs (x1, y1);
446 pSGP->lineAbs (x2, y2);
450 double len = lineLength (x1, y1, x2, y2);
451 return (len * pelem.atten());