** This is part of the CTSim program
** Copyright (C) 1983-2000 Kevin Rosenberg
**
-** $Id: phantom.cpp,v 1.1 2000/06/19 02:59:34 kevin Exp $
+** $Id: phantom.cpp,v 1.4 2000/06/22 10:17:28 kevin Exp $
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License (version 2) as
//
Phantom::Phantom (void)
+{
+ init ();
+}
+
+
+Phantom::Phantom (const char* const phmName)
+{
+ init ();
+ createFromPhantom (phmName);
+}
+
+void
+Phantom::init (void)
{
m_nPElem = 0;
m_xmin = 1E30;
m_ymax = -1E30;
m_diameter = 0;
m_composition = P_PELEMS;
+ m_fail = false;
+ m_id = PHM_INVALID;
}
-
Phantom::~Phantom (void)
{
for (PElemIterator i = m_listPElem.begin(); i != m_listPElem.end(); i++) {
}
-void
-Phantom::create (const int phmid)
+const char*
+Phantom::convertPhantomIDToName (const PhantomID phmID)
+{
+ const char *name = "";
+
+ if (phmID == PHM_HERMAN)
+ name = PHM_HERMAN_STR;
+ else if (phmID == PHM_BHERMAN)
+ name = PHM_BHERMAN_STR;
+ else if (phmID == PHM_ROWLAND)
+ name = PHM_ROWLAND_STR;
+ else if (phmID == PHM_BROWLAND)
+ name = PHM_BROWLAND_STR;
+ else if (phmID == PHM_UNITPULSE)
+ name = PHM_UNITPULSE_STR;
+
+ return (name);
+}
+
+Phantom::PhantomID
+Phantom::convertNameToPhantomID (const char* const phmName)
+{
+ PhantomID id;
+
+ if (strcasecmp (phmName, PHM_HERMAN_STR) == 0)
+ id = PHM_HERMAN;
+ else if (strcasecmp (phmName, PHM_BHERMAN_STR) == 0)
+ id = PHM_BHERMAN;
+ else if (strcasecmp (phmName, PHM_ROWLAND_STR) == 0)
+ id = PHM_ROWLAND;
+ else if (strcasecmp (phmName, PHM_BROWLAND_STR) == 0)
+ id = PHM_BROWLAND;
+ else if (strcasecmp (phmName, PHM_UNITPULSE_STR) == 0)
+ id = PHM_UNITPULSE;
+ else
+ id = PHM_INVALID;
+
+ return (id);
+}
+
+
+bool
+Phantom::createFromPhantom (const char* const phmName)
+{
+ PhantomID phmid = convertNameToPhantomID (phmName);
+ m_name = phmName;
+
+ createFromPhantom (phmid);
+}
+
+bool
+Phantom::createFromPhantom (const PhantomID phmid)
{
switch (phmid)
{
- case O_PHM_HERMAN:
- std_herman();
+ case PHM_HERMAN:
+ addStdHerman();
+ break;
+ case PHM_BHERMAN:
+ addStdHermanBordered();
break;
- case O_PHM_ROWLAND:
- std_rowland();
+ case PHM_ROWLAND:
+ addStdRowland();
break;
- case O_PHM_BROWLAND:
- std_rowland_bordered ();
+ case PHM_BROWLAND:
+ addStdRowlandBordered ();
break;
- case O_PHM_UNITPULSE:
+ case PHM_UNITPULSE:
m_composition = P_UNIT_PULSE;
addPElem ("rectangle", 0., 0., 100., 100., 0., 0.); // outline
addPElem ("ellipse", 0., 0., 1., 1., 0., 1.); // pulse
break;
default:
sys_error (ERR_WARNING, "Illegal phantom id %d\n", phmid);
+ m_name += " -- INVALID";
+ m_fail = true;
+ return false;
break;
}
+
+ m_id = phmid;
+
+ return true;
}
/* NAME
- * std_rowland Make head phantom of S.W. Rowland
- *
- * SYNOPSIS
- * std_rowland ()
+ * addStdRowland Make head phantom of S.W. Rowland
*
* REFERENCES
* S. W. Rowland, "Computer Implementation of Image Reconstruction
*/
void
-Phantom::std_rowland (void)
+Phantom::addStdRowland (void)
{
addPElem("ellipse", 0.0000, 0.0000, 0.6900, 0.9200, 0.0, 1.00);
addPElem("ellipse", 0.0000, -0.0184, 0.6624, 0.8740, 0.0, -0.98);
}
void
-Phantom::std_rowland_bordered (void)
+Phantom::addStdRowlandBordered (void)
{
- std_rowland ();
+ addStdRowland ();
addPElem ("ellipse", 0.000, 0.0000, 0.7500, 1.000, 0.0, 0.00);
}
/* NAME
- * std_herman Standard head phantom of G. T. Herman
- *
- * SYNOPSIS
- * std_herman ()
+ * addStdHerman Standard head phantom of G. T. Herman
*
* REFERENCES
* G. T. Herman, "Image Reconstructions from Projections: The Fundementals
*/
void
-Phantom::std_herman (void)
+Phantom::addStdHerman (void)
{
addPElem("ellipse", 0.000, 1.50, 0.375, 0.3000, 90.00, -0.003);
addPElem("ellipse", 0.675, -0.75, 0.225, 0.1500, 140.00, 0.010);
addPElem("ellipse", 0.000, 0.00, 7.875, 5.7187, 90.00, -0.206);
}
+void
+Phantom::addStdHermanBordered (void)
+{
+ addPElem("ellipse", 0., 0., 6.6, 5.9, 90., 0.);
+}
+
+
+/* NAME
+ * convertToImagefile Make image array from Phantom
+ *
+ * SYNOPSIS
+ * pic_to_imagefile (pic, im, nsample)
+ * Phantom& pic Phantom definitions
+ * ImageFile *im Computed pixel array
+ * int nsample Number of samples along each axis for each pixel
+ * (total samples per pixel = nsample * nsample)
+ */
+
+void
+Phantom::convertToImagefile (ImageFile& im, const int in_nsample, const int trace) const
+{
+ convertToImagefile (im, in_nsample, trace, 0, im.nx());
+}
+
+void
+Phantom::convertToImagefile (ImageFile& im, const int in_nsample, const int trace, const int colStart, const int colCount) const
+{
+ int nx = im.nx();
+ int ny = im.ny();
+ if (nx < 2 || ny < 2)
+ return;
+
+ int nsample = in_nsample;
+ if (nsample < 1)
+ nsample = 1;
+
+ double dx = m_xmax - m_xmin;
+ double dy = m_ymax - m_ymin;
+ double xcent = m_xmin + dx / 2;
+ double ycent = m_ymin + dy / 2;
+ double phmlen = (dx > dy ? dx : dy);
+
+ double phmradius = phmlen / 2;
+
+ double xmin = xcent - phmradius;
+ double xmax = xcent + phmradius;
+ double ymin = ycent - phmradius;
+ double ymax = ycent + phmradius;
+
+ // Each pixel holds the average of the intensity of the cell with (ix,iy) at the center of the pixel
+ // Set major increments so that the last cell v[nx-1][ny-1] will start at xmax - xinc, ymax - yinc).
+ // Set minor increments so that sample points are centered in cell
+
+ double xinc = (xmax - xmin) / nx;
+ double yinc = (ymax - ymin) / ny;
+
+ double kxinc = xinc / nsample; /* interval between samples */
+ double kyinc = yinc / nsample;
+ double kxofs = kxinc / 2; /* offset of 1st point */
+ double kyofs = kyinc / 2;
+
+ im.setAxisExtent (xmin, xmax, ymin, ymax);
+ im.setAxisIncrement (xinc, yinc);
+
+ ImageFileArray v = im.getArray();
+
+ double x_start = xmin + (colStart * xinc);
+ for (PElemConstIterator pelem = m_listPElem.begin(); pelem != m_listPElem.end(); pelem++) {
+ double x, y, xi, yi;
+ int ix, iy, kx, ky;
+ for (ix = 0, x = x_start; ix < colCount; ix++, x += xinc) {
+ for (iy = 0, y = ymin; iy < ny; iy++, y += yinc) {
+ for (kx = 0, xi = x + kxofs; kx < nsample; kx++, xi += kxinc) {
+ for (ky = 0, yi = y + kyofs; ky < nsample; ky++, yi += kyinc)
+ if ((*pelem)->isPointInside (xi, yi, PHM_COORD) == TRUE)
+ v[ix][iy] += (*pelem)->atten();
+ } // for kx
+ } /* for iy */
+ } /* for ix */
+ } /* for pelem */
+
+
+ if (nsample > 1) {
+ double factor = 1.0 / (nsample * nsample);
+
+ for (int ix = 0; ix < colCount; ix++)
+ for (int iy = 0; iy < ny; iy++)
+ v[ix][iy] *= factor;
+ }
+}
////////////////////////////////////////////////////////////////////////////////////////////////////////
// CLASS IDENTIFICATION
{
m_rot = convertDegreesToRadians (rot); // convert angle to radians
- if (strcasecmp (type, "rectangle") == 0)
- m_type = PELEM_RECTANGLE;
- else if (strcasecmp (type, "triangle") == 0)
- m_type = PELEM_TRIANGLE;
- else if (strcasecmp (type, "ellipse") == 0)
- m_type = PELEM_ELLIPSE;
- else if (strcasecmp (type, "sector") == 0)
- m_type = PELEM_SECTOR;
- else if (strcasecmp (type, "segment") == 0)
- m_type = PELEM_SEGMENT;
- else {
- sys_error (ERR_WARNING, "Unknown PhantomElement type %s [PhantomElement::PhantomElement]", type);
- m_type = PELEM_INVALID;
- }
+ m_type = convertNameToType (type);
makeTransformMatrices (); // calc transform matrices between phantom and normalized phantomelement
makeVectorOutline (); // calculate vector outline of pelem
delete m_yOutline;
}
+PhmElemType
+PhantomElement::convertNameToType (const char* const typeName)
+{
+ PhmElemType type = PELEM_INVALID;
+
+ if (strcasecmp (typeName, "rectangle") == 0)
+ type = PELEM_RECTANGLE;
+ else if (strcasecmp (typeName, "triangle") == 0)
+ type = PELEM_TRIANGLE;
+ else if (strcasecmp (typeName, "ellipse") == 0)
+ type = PELEM_ELLIPSE;
+ else if (strcasecmp (typeName, "sector") == 0)
+ type = PELEM_SECTOR;
+ else if (strcasecmp (typeName, "segment") == 0)
+ type = PELEM_SEGMENT;
+ else
+ sys_error (ERR_WARNING, "Unknown PhantomElement type %s [PhantomElement::PhantomElement]", type);
+
+ return (type);
+}
+
void
PhantomElement::makeTransformMatrices (void)
{
* Called by phm_add_pelem()
*/
-static const double SCALE_PELEM_EXTENT=0.005; // increase pelem limits by 0.5%
-
void
PhantomElement::makeVectorOutline (void)
{
}
-
/* NAME
* calc_arc Calculate outline of a arc of a circle
*
*/
int
-PhantomElement::numCirclePoints (double theta) const
+PhantomElement::numCirclePoints (double theta)
{
- if (theta < 0.0 || theta > TWOPI)
- sys_error(ERR_WARNING, "illegal values sent to circle_pts");
+ theta = clamp (theta, 0., TWOPI);
return static_cast<int> (POINTS_PER_CIRCLE * theta / TWOPI + 1.5);
}
projects / ctsim.git / blobdiff