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 1.1 2000/06/19 02:59:34 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 ScannerGeometry geometry, int nDet, int nView, int nSample, const double rot_anglen)
65 m_phmLen = phm.maxAxisLength(); // maximal length along an axis
74 ++nDet; // ensure odd number of detectors
76 m_geometry = geometry;
80 m_detLen = SQRT2 * m_phmLen * ((m_nDet + N_EXTRA_DETECTORS) / static_cast<double>(m_nDet));
82 m_rotLen = rot_anglen;
84 m_radius = m_detLen / 2;
85 m_detInc = m_detLen / m_nDet;
86 m_rotInc = m_rotLen / m_nView;
88 m_initPos.xd1 = m_detLen / 2;
89 m_initPos.yd1 = -m_detLen / 2;
90 m_initPos.xd2 = m_detLen / 2;
91 m_initPos.yd2 = m_detLen / 2;
92 m_initPos.xs1 = -m_detLen / 2;
93 m_initPos.ys1 = -m_detLen / 2;
94 m_initPos.xs2 = -m_detLen / 2;
95 m_initPos.ys2 = m_detLen / 2;
96 m_initPos.angle = 0.0;
99 Scanner::~Scanner (void)
106 * raysum_collect Calculate ray sums for a Phantom
109 * rs = raysum_collect (det, phm, start_view, trace, unit_pulse)
110 * Scanner& det Scanner specifications**
111 * RAYSUM *rs Calculated ray sum matrix
112 * Phantom& phm Phantom we are taking ray sums of
113 * int trace Boolean flag to signal ray sum tracing
117 Scanner::collectProjections (Projections& proj, const Phantom& phm, const int start_view, const int trace)
119 GRFMTX_2D rotmtx_initial, temp;
120 GRFMTX_2D rotmtx_incr;
122 double start_angle = start_view * proj.rotInc();
123 double xcent = phm.xmin() + (phm.xmax() - phm.xmin()) / 2;
124 double ycent = phm.ymin() + (phm.ymax() - phm.ymin()) / 2;
126 double xd1 = xcent + m_initPos.xd1;
127 double yd1 = ycent + m_initPos.yd1;
128 double xd2 = xcent + m_initPos.xd2;
129 double yd2 = ycent + m_initPos.yd2;
130 double xs1 = xcent + m_initPos.xs1;
131 double ys1 = ycent + m_initPos.ys1;
132 double xs2 = xcent + m_initPos.xs2;
133 double ys2 = ycent + m_initPos.ys2;
139 if (m_trace >= TRACE_PHM) {
140 double wsize = 1.42 * m_phmLen / 2; /* sqrt(2) * radius */
142 gid = sgp2_init (512, 512, "RayCollect");
143 sgp2_color (C_LTBLUE);
144 sgp2_window (xcent - wsize, ycent - wsize, xcent + wsize, ycent + wsize);
145 sgp2_color (C_BROWN);
147 sgp2_draw_circle (m_phmLen / 2);
149 sgp2_draw_rect (xcent - m_phmLen / 2, ycent - m_phmLen / 2,
150 xcent + m_phmLen / 2, ycent + m_phmLen / 2);
152 sgp2_color (C_BROWN);
153 sgp2_move_abs (0., 0.);
154 sgp2_draw_circle (wsize);
155 // raysum_trace_menu_column = (crt->xsize * crt->asp) / 8 + 3;
156 traceShowParam ("X-Ray Simulator", "%s", RAYSUM_TRACE_ROW_TITLE, 8+C_LTWHITE, " ");
157 traceShowParam ("---------------", "%s", RAYSUM_TRACE_ROW_TITLE2, 8+C_LTWHITE, " ");
158 traceShowParam ("Phantom:", "%s", RAYSUM_TRACE_ROW_PHANT_ID, C_YELLOW, " Herman");
159 traceShowParam ("Chomaticity :", "%s", RAYSUM_TRACE_ROW_CHROMATIC, C_LTGREEN, "Mono");
160 traceShowParam ("Scatter :", "%5.1f", RAYSUM_TRACE_ROW_SCATTER, C_LTGREEN, 0.);
161 traceShowParam ("Photon Uncert:", "%5.1f", RAYSUM_TRACE_ROW_PHOT_STAT, C_LTGREEN, 0.);
162 traceShowParam ("Num Scanners:", "%5d", RAYSUM_TRACE_ROW_NDET, C_LTRED, proj.nDet());
163 traceShowParam ("Num Views :", "%5d", RAYSUM_TRACE_ROW_NVIEW, C_LTRED, proj.nView());
164 traceShowParam ("Samples / Ray:", "%5d", RAYSUM_TRACE_ROW_SAMPLES, C_LTRED, m_nSample);
166 sgp2_color (C_LTGREEN);
169 initmarker (BDIAMOND, 129);
173 /* Calculate initial rotation matrix */
174 xlat_mtx2 (rotmtx_initial, -xcent, -ycent);
175 rot_mtx2 (temp, start_angle);
176 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
177 xlat_mtx2 (temp, xcent, ycent);
178 mult_mtx2 (rotmtx_initial, temp, rotmtx_initial);
180 xform_mtx2 (rotmtx_initial, xd1, yd1); /* rotate detector endpoints */
181 xform_mtx2 (rotmtx_initial, xd2, yd2); /* to initial view_angle */
182 xform_mtx2 (rotmtx_initial, xs1, ys1);
183 xform_mtx2 (rotmtx_initial, xs2, ys2);
185 /* Calculate incrementatal rotation matrix */
186 xlat_mtx2 (rotmtx_incr, -xcent, -ycent);
187 rot_mtx2 (temp, proj.rotInc());
188 mult_mtx2 (rotmtx_incr, temp, rotmtx_incr);
189 xlat_mtx2 (temp, xcent, ycent);
190 mult_mtx2 (rotmtx_incr, temp, rotmtx_incr);
194 for (iview = 0, viewAngle = start_angle; iview < proj.nView(); iview++, viewAngle += proj.rotInc()) {
195 DetectorArray& detArray = proj.getDetectorArray( iview );
198 if (m_trace >= TRACE_PHM) {
199 sgp2_move_abs (xd1, yd1);
200 sgp2_line_abs (xd2, yd2);
201 sgp2_move_abs (xs1, ys1);
202 sgp2_line_abs (xs2, ys2);
206 traceShowParam ("Current View :", "%5d", RAYSUM_TRACE_ROW_CURR_VIEW, C_LTMAGENTA, iview);
208 projectSingleView (phm, detArray, xd1, yd1, xd2, yd2, xs1, ys1, xs2, ys2);
209 detArray.setViewAngle (viewAngle);
212 if (m_trace >= TRACE_PHM) {
213 // rs_plot (detArray, xd1, yd1, xcent, ycent, theta);
214 sgp2_move_abs (xd1, yd1);
215 sgp2_line_abs (xd2, yd2);
216 sgp2_move_abs (xs1, ys1);
217 sgp2_line_abs (xs2, ys2);
220 xform_mtx2 (rotmtx_incr, xd1, yd1); // rotate detector endpoints
221 xform_mtx2 (rotmtx_incr, xd2, yd2);
222 xform_mtx2 (rotmtx_incr, xs1, ys1);
223 xform_mtx2 (rotmtx_incr, xs2, ys2);
224 } /* for each iview */
229 * rayview Calculate raysums for a view at any angle
232 * rayview (phm, detArray, xd1, nSample, yd1, xd2, yd2, xs1, ys1, xs2, ys2)
233 * Phantom& phm Phantom to scan
234 * DETARRAY *detArray Storage of values for detector array
235 * Scanner& det Scanner parameters
236 * double xd1, yd1, xd2, yd2 Beginning & ending detector positions
237 * double xs1, ys1, xs2, ys2 Beginning & ending source positions
240 * For each detector, have there are a variable number of rays traced.
241 * The source of each ray is the center of the source x-ray cell. The
242 * detector positions are equally spaced within the cell
244 * The increments between rays are calculated so that the cells start
245 * at the beginning of a detector cell and they end on the endpoint
246 * of the cell. Thus, the last cell starts at (xd2-ddx),(yd2-ddy).
247 * The exception to this is if there is only one ray per detector.
248 * In that case, the detector position is the center of the detector cell.
252 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)
254 double ddx = (xd2 - xd1) / detArray.nDet(); // change in coords between detectors
255 double ddy = (yd2 - yd1) / detArray.nDet();
256 double sdx = (xs2 - xs1) / detArray.nDet(); // change in coords between source
257 double sdy = (ys2 - ys1) / detArray.nDet();
259 double ddx2 = ddx / m_nSample; // Incr. between rays with detector cell
260 double ddy2 = ddy / m_nSample; // Doesn't include detector endpoints
261 double ddx2_ofs = ddx2 / 2; // offset of 1st ray from start of detector cell
262 double ddy2_ofs = ddy2 / 2;
264 double xd_maj = xd1 + ddx2_ofs; // Incr. between detector cells
265 double yd_maj = yd1 + ddy2_ofs;
266 double xs_maj = xs1 + (sdx / 2); // put ray source in center of cell
267 double ys_maj = ys1 + (sdy / 2);
269 DetectorValue* detval = detArray.detValues();
271 if (phm.getComposition() == P_UNIT_PULSE) { // put unit pulse in center of view
272 for (int d = 0; d < detArray.nDet(); d++)
273 if (detArray.nDet() / 2 == d && (d % 2) == 1)
278 for (int d = 0; d < detArray.nDet(); d++) {
284 for (int i = 0; i < m_nSample; i++) {
286 if (m_trace >= TRACE_RAYS) {
287 sgp2_move_abs (xs, ys);
288 sgp2_line_abs (xd, yd);
291 sum += projectSingleLine (phm, xd, yd, xs, ys);
293 if (m_trace >= TRACE_RAYS)
294 traceShowParam ("Attenuation :", "%5.2f", RAYSUM_TRACE_ROW_ATTEN, C_LTMAGENTA, "sum");
297 if (m_trace >= TRACE_RAYS) {
298 sgp2_move_abs (xs, ys);
299 sgp2_line_abs (xd, yd);
306 detval[d] = sum / m_nSample;
311 } /* for each detector */
312 } /* if not unit pulse */
317 Scanner::traceShowParam (const char *label, const char *fmt, int row, int color, ...)
322 va_start(arg, color);
323 // cio_set_cpos (raysum_trace_menu_column, row);
324 snprintf (s, sizeof(s), label, "%s");
325 // cio_set_text_clr (color - 8, 0);
327 vsnprintf (s, sizeof(s), fmt, arg);
328 // cio_set_text_clr (color, 0);
336 * projectSingleLine INTERNAL: Calculates raysum along a line for a Phantom
339 * rsum = phm_ray_attenuation (phm, x1, y1, x2, y2)
340 * double rsum Ray sum of Phantom along given line
341 * Phantom& phm; Phantom from which to calculate raysum
342 * double *x1, *y1, *x2, y2 Endpoints of ray path (in Phantom coords)
346 Scanner::projectSingleLine (const Phantom& phm, const double x1, const double y1, const double x2, const double y2)
348 // check ray against each pelem in Phantom
350 for (PElemConstIterator i = phm.listPElem().begin(); i != phm.listPElem().end(); i++)
351 rsum += projectLineAgainstPElem (**i, x1, y1, x2, y2);
358 * pelem_ray_attenuation Calculate raysum of an pelem along one line
361 * rsum = pelem_ray_attenuation (pelem, x1, y1, x2, y2)
362 * double rsum Computed raysum
363 * PhantomElement& pelem Pelem to scan
364 * double x1, y1, x2, y2 Endpoints of raysum line
368 Scanner::projectLineAgainstPElem (const PhantomElement& pelem, double x1, double y1, double x2, double y2)
370 if (! pelem.clipLineWorldCoords (x1, y1, x2, y2)) {
371 if (m_trace == TRACE_CLIPPING)
372 cio_tone (1000., 0.05);
377 if (m_trace == TRACE_CLIPPING) {
378 sgp2_move_abs (x1, y1);
379 sgp2_line_abs (x2, y2);
380 cio_tone (8000., 0.05);
381 sgp2_move_abs (x1, y1);
382 sgp2_line_abs (x2, y2);
386 double len = lineLength (x1, y1, x2, y2);
387 return (len * pelem.atten());