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 1.3 2000/07/13 07:03:21 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 ******************************************************************************/
32 // DetectorArray Construct a DetectorArray
34 DetectorArray::DetectorArray (const int nDet)
37 m_detValues = new DetectorValue [m_nDet];
42 // ~DetectorArray Free memory allocated to a detector array
44 DetectorArray::~DetectorArray (void)
46 delete [] m_detValues;
52 * Scanner::Scanner Construct a user specified detector structure
55 * Scanner (phm, nDet, nView, nSample)
56 * Phantom& phm PHANTOM that we are making detector for
57 * int geomety Geometry of detector
58 * int nDet Number of detector along detector array
59 * int nView Number of rotated views
60 * int nSample Number of rays per detector
63 Scanner::Scanner (const Phantom& phm, const char* const geometryName, int nDet, int nView, int nSample, const double rot_anglen)
65 m_phmLen = phm.maxAxisLength(); // maximal length along an axis
68 m_idGeometry = convertGeometryNameToID (geometryName);
69 if (m_idGeometry == GEOMETRY_INVALID) {
71 m_failMessage = "Invalid geometry name ";
72 m_failMessage += geometryName;
83 ++nDet; // ensure odd number of detectors
88 m_detLen = SQRT2 * m_phmLen * ((m_nDet + N_EXTRA_DETECTORS) / static_cast<double>(m_nDet));
90 m_rotLen = rot_anglen;
92 m_radius = m_detLen / 2;
93 m_detInc = m_detLen / m_nDet;
94 m_rotInc = m_rotLen / m_nView;
96 m_initPos.xd1 = m_detLen / 2;
97 m_initPos.yd1 = -m_detLen / 2;
98 m_initPos.xd2 = m_detLen / 2;
99 m_initPos.yd2 = m_detLen / 2;
100 m_initPos.xs1 = -m_detLen / 2;
101 m_initPos.ys1 = -m_detLen / 2;
102 m_initPos.xs2 = -m_detLen / 2;
103 m_initPos.ys2 = m_detLen / 2;
104 m_initPos.angle = 0.0;
107 Scanner::~Scanner (void)
113 Scanner::convertGeometryNameToID (const char* const geometryName)
115 GeometryID geometryID = GEOMETRY_INVALID;
117 if (strcasecmp (geometryName, GEOMETRY_PARALLEL_STR) == 0)
118 geometryID = GEOMETRY_PARALLEL;
119 else if (strcasecmp (geometryName, GEOMETRY_EQUILINEAR_STR) == 0)
120 geometryID = GEOMETRY_EQUILINEAR;
121 else if (strcasecmp (geometryName, GEOMETRY_EQUIANGLE_STR) == 0)
122 geometryID = GEOMETRY_EQUIANGLE;
130 * raysum_collect Calculate ray sums for a Phantom
133 * rs = raysum_collect (det, phm, start_view, trace, unit_pulse)
134 * Scanner& det Scanner specifications**
135 * RAYSUM *rs Calculated ray sum matrix
136 * Phantom& phm Phantom we are taking ray sums of
137 * int trace Boolean flag to signal ray sum tracing
141 Scanner::collectProjections (Projections& proj, const Phantom& phm, const int start_view, const int trace)
143 GRFMTX_2D rotmtx_initial, temp;
144 GRFMTX_2D rotmtx_incr;
146 double start_angle = start_view * proj.rotInc();
147 double xcent = phm.xmin() + (phm.xmax() - phm.xmin()) / 2;
148 double ycent = phm.ymin() + (phm.ymax() - phm.ymin()) / 2;
150 double xd1 = xcent + m_initPos.xd1;
151 double yd1 = ycent + m_initPos.yd1;
152 double xd2 = xcent + m_initPos.xd2;
153 double yd2 = ycent + m_initPos.yd2;
154 double xs1 = xcent + m_initPos.xs1;
155 double ys1 = ycent + m_initPos.ys1;
156 double xs2 = xcent + m_initPos.xs2;
157 double ys2 = ycent + m_initPos.ys2;
163 if (m_trace >= TRACE_PHM) {
164 double wsize = 1.42 * m_phmLen / 2; /* sqrt(2) * radius */
166 gid = sgp2_init (512, 512, "RayCollect");
167 sgp2_color (C_LTBLUE);
168 sgp2_window (xcent - wsize, ycent - wsize, xcent + wsize, ycent + wsize);
169 sgp2_color (C_BROWN);
171 sgp2_draw_circle (m_phmLen / 2);
173 sgp2_draw_rect (xcent - m_phmLen / 2, ycent - m_phmLen / 2,
174 xcent + m_phmLen / 2, ycent + m_phmLen / 2);
176 sgp2_color (C_BROWN);
177 sgp2_move_abs (0., 0.);
178 sgp2_draw_circle (wsize);
179 // raysum_trace_menu_column = (crt->xsize * crt->asp) / 8 + 3;
180 traceShowParam ("X-Ray Simulator", "%s", RAYSUM_TRACE_ROW_TITLE, 8+C_LTWHITE, " ");
181 traceShowParam ("---------------", "%s", RAYSUM_TRACE_ROW_TITLE2, 8+C_LTWHITE, " ");
182 traceShowParam ("Phantom:", "%s", RAYSUM_TRACE_ROW_PHANT_ID, C_YELLOW, " Herman");
183 traceShowParam ("Chomaticity :", "%s", RAYSUM_TRACE_ROW_CHROMATIC, C_LTGREEN, "Mono");
184 traceShowParam ("Scatter :", "%5.1f", RAYSUM_TRACE_ROW_SCATTER, C_LTGREEN, 0.);
185 traceShowParam ("Photon Uncert:", "%5.1f", RAYSUM_TRACE_ROW_PHOT_STAT, C_LTGREEN, 0.);
186 traceShowParam ("Num Scanners:", "%5d", RAYSUM_TRACE_ROW_NDET, C_LTRED, proj.nDet());
187 traceShowParam ("Num Views :", "%5d", RAYSUM_TRACE_ROW_NVIEW, C_LTRED, proj.nView());
188 traceShowParam ("Samples / Ray:", "%5d", RAYSUM_TRACE_ROW_SAMPLES, C_LTRED, m_nSample);
190 sgp2_color (C_LTGREEN);
193 initmarker (BDIAMOND, 129);
197 /* Calculate initial rotation matrix */
198 xlat_mtx2 (rotmtx_initial, -xcent, -ycent);
199 rot_mtx2 (temp, start_angle);
200 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
201 xlat_mtx2 (temp, xcent, ycent);
202 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
204 xform_mtx2 (rotmtx_initial, xd1, yd1); /* rotate detector endpoints */
205 xform_mtx2 (rotmtx_initial, xd2, yd2); /* to initial view_angle */
206 xform_mtx2 (rotmtx_initial, xs1, ys1);
207 xform_mtx2 (rotmtx_initial, xs2, ys2);
209 /* Calculate incrementatal rotation matrix */
210 xlat_mtx2 (rotmtx_incr, -xcent, -ycent);
211 rot_mtx2 (temp, proj.rotInc());
212 mult_mtx2 (rotmtx_incr, temp, rotmtx_incr);
213 xlat_mtx2 (temp, xcent, ycent);
214 mult_mtx2 (rotmtx_incr, temp, rotmtx_incr);
218 for (iview = 0, viewAngle = start_angle; iview < proj.nView(); iview++, viewAngle += proj.rotInc()) {
219 DetectorArray& detArray = proj.getDetectorArray( iview );
222 if (m_trace >= TRACE_PHM) {
223 sgp2_move_abs (xd1, yd1);
224 sgp2_line_abs (xd2, yd2);
225 sgp2_move_abs (xs1, ys1);
226 sgp2_line_abs (xs2, ys2);
230 traceShowParam ("Current View :", "%5d", RAYSUM_TRACE_ROW_CURR_VIEW, C_LTMAGENTA, iview);
232 projectSingleView (phm, detArray, xd1, yd1, xd2, yd2, xs1, ys1, xs2, ys2);
233 detArray.setViewAngle (viewAngle);
236 if (m_trace >= TRACE_PHM) {
237 // rs_plot (detArray, xd1, yd1, xcent, ycent, theta);
238 sgp2_move_abs (xd1, yd1);
239 sgp2_line_abs (xd2, yd2);
240 sgp2_move_abs (xs1, ys1);
241 sgp2_line_abs (xs2, ys2);
244 xform_mtx2 (rotmtx_incr, xd1, yd1); // rotate detector endpoints
245 xform_mtx2 (rotmtx_incr, xd2, yd2);
246 xform_mtx2 (rotmtx_incr, xs1, ys1);
247 xform_mtx2 (rotmtx_incr, xs2, ys2);
248 } /* for each iview */
253 * rayview Calculate raysums for a view at any angle
256 * rayview (phm, detArray, xd1, nSample, yd1, xd2, yd2, xs1, ys1, xs2, ys2)
257 * Phantom& phm Phantom to scan
258 * DETARRAY *detArray Storage of values for detector array
259 * Scanner& det Scanner parameters
260 * double xd1, yd1, xd2, yd2 Beginning & ending detector positions
261 * double xs1, ys1, xs2, ys2 Beginning & ending source positions
264 * For each detector, have there are a variable number of rays traced.
265 * The source of each ray is the center of the source x-ray cell. The
266 * detector positions are equally spaced within the cell
268 * The increments between rays are calculated so that the cells start
269 * at the beginning of a detector cell and they end on the endpoint
270 * of the cell. Thus, the last cell starts at (xd2-ddx),(yd2-ddy).
271 * The exception to this is if there is only one ray per detector.
272 * In that case, the detector position is the center of the detector cell.
276 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)
278 double ddx = (xd2 - xd1) / detArray.nDet(); // change in coords between detectors
279 double ddy = (yd2 - yd1) / detArray.nDet();
280 double sdx = (xs2 - xs1) / detArray.nDet(); // change in coords between source
281 double sdy = (ys2 - ys1) / detArray.nDet();
283 double ddx2 = ddx / m_nSample; // Incr. between rays with detector cell
284 double ddy2 = ddy / m_nSample; // Doesn't include detector endpoints
285 double ddx2_ofs = ddx2 / 2; // offset of 1st ray from start of detector cell
286 double ddy2_ofs = ddy2 / 2;
288 double xd_maj = xd1 + ddx2_ofs; // Incr. between detector cells
289 double yd_maj = yd1 + ddy2_ofs;
290 double xs_maj = xs1 + (sdx / 2); // put ray source in center of cell
291 double ys_maj = ys1 + (sdy / 2);
293 DetectorValue* detval = detArray.detValues();
295 if (phm.getComposition() == P_UNIT_PULSE) { // put unit pulse in center of view
296 for (int d = 0; d < detArray.nDet(); d++)
297 if (detArray.nDet() / 2 == d && (d % 2) == 1)
302 for (int d = 0; d < detArray.nDet(); d++) {
308 for (unsigned int i = 0; i < m_nSample; i++) {
310 if (m_trace >= TRACE_RAYS) {
311 sgp2_move_abs (xs, ys);
312 sgp2_line_abs (xd, yd);
315 sum += projectSingleLine (phm, xd, yd, xs, ys);
317 if (m_trace >= TRACE_RAYS)
318 traceShowParam ("Attenuation :", "%5.2f", RAYSUM_TRACE_ROW_ATTEN, C_LTMAGENTA, "sum");
321 if (m_trace >= TRACE_RAYS) {
322 sgp2_move_abs (xs, ys);
323 sgp2_line_abs (xd, yd);
330 detval[d] = sum / m_nSample;
335 } /* for each detector */
336 } /* if not unit pulse */
341 Scanner::traceShowParam (const char *label, const char *fmt, int row, int color, ...)
346 va_start(arg, color);
347 // cio_set_cpos (raysum_trace_menu_column, row);
348 snprintf (s, sizeof(s), label, "%s");
349 // cio_set_text_clr (color - 8, 0);
351 vsnprintf (s, sizeof(s), fmt, arg);
352 // cio_set_text_clr (color, 0);
360 * projectSingleLine INTERNAL: Calculates raysum along a line for a Phantom
363 * rsum = phm_ray_attenuation (phm, x1, y1, x2, y2)
364 * double rsum Ray sum of Phantom along given line
365 * Phantom& phm; Phantom from which to calculate raysum
366 * double *x1, *y1, *x2, y2 Endpoints of ray path (in Phantom coords)
370 Scanner::projectSingleLine (const Phantom& phm, const double x1, const double y1, const double x2, const double y2)
372 // check ray against each pelem in Phantom
374 for (PElemConstIterator i = phm.listPElem().begin(); i != phm.listPElem().end(); i++)
375 rsum += projectLineAgainstPElem (**i, x1, y1, x2, y2);
382 * pelem_ray_attenuation Calculate raysum of an pelem along one line
385 * rsum = pelem_ray_attenuation (pelem, x1, y1, x2, y2)
386 * double rsum Computed raysum
387 * PhantomElement& pelem Pelem to scan
388 * double x1, y1, x2, y2 Endpoints of raysum line
392 Scanner::projectLineAgainstPElem (const PhantomElement& pelem, double x1, double y1, double x2, double y2)
394 if (! pelem.clipLineWorldCoords (x1, y1, x2, y2)) {
395 if (m_trace == TRACE_CLIPPING)
396 cio_tone (1000., 0.05);
401 if (m_trace == TRACE_CLIPPING) {
402 sgp2_move_abs (x1, y1);
403 sgp2_line_abs (x2, y2);
404 cio_tone (8000., 0.05);
405 sgp2_move_abs (x1, y1);
406 sgp2_line_abs (x2, y2);
410 double len = lineLength (x1, y1, x2, y2);
411 return (len * pelem.atten());