1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
-----------------------------------------------------------------------
Copyright: 2010-2018, imec Vision Lab, University of Antwerp
2014-2018, CWI, Amsterdam
Contact: astra@astra-toolbox.com
Website: http://www.astra-toolbox.com/
This file is part of the ASTRA Toolbox.
The ASTRA Toolbox is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The ASTRA Toolbox is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
*/
#ifndef _INC_ASTRA_CONEPROJECTIONGEOMETRY3D
#define _INC_ASTRA_CONEPROJECTIONGEOMETRY3D
#include "ProjectionGeometry3D.h"
namespace astra
{
/**
* This class defines a 3D cone beam projection geometry.
*
* \par XML Configuration
* \astra_xml_item{DetectorRowCount, int, Number of detectors for each projection.}
* \astra_xml_item{DetectorColCount, int, Number of detectors for each projection.}
* \astra_xml_item{DetectorSpacingX, float, Width of each detector.}
* \astra_xml_item{DetectorSpacingY, float, Width of each detector.}
* \astra_xml_item{ProjectionAngles, vector of float, projection angles in radians.}
* \astra_xml_item{DistanceOriginDetector, float, Distance between the center of rotation and the detectorarray.}
* \astra_xml_item{DistanceOriginSource, float, Distance between the center of rotation the the x-ray source.}
*
* \par MATLAB example
* \astra_code{
* proj_geom = astra_struct('cone');\n
* proj_geom.DetectorRowCount = 512;\n
* proj_geom.DetectorColCount = 512;\n
* proj_geom.DetectorSpacingX = 1.0;\n
* proj_geom.DetectorSpacingY = 1.0;\n
* proj_geom.ProjectionAngles = linspace(0,pi,100);\n
* proj_geom.DistanceOriginDetector = 10000;\n
* proj_geom.DistanceOriginSource = 10000;\n
* }
*/
class _AstraExport CConeProjectionGeometry3D : public CProjectionGeometry3D
{
protected:
/**
* Distance from the origin of the coordinate system to the source.
*/
float32 m_fOriginSourceDistance;
/**
* Distance from the origin of the coordinate system to the detector (i.e., the distance between the origin and its orthogonal projection
* onto the detector array).
*/
float32 m_fOriginDetectorDistance;
public:
/** Default constructor. Sets all numeric member variables to 0 and all pointer member variables to NULL.
*
* If an object is constructed using this default constructor, it must always be followed by a call
* to one of the initialize() methods before the object can be used. Any use before calling initialize()
* is not allowed, except calling the member function isInitialized().
*/
CConeProjectionGeometry3D();
/** Constructor. Create an instance of the CParallelProjectionGeometry3D class.
*
* @param _iProjectionAngleCount Number of projection angles.
* @param _iDetectorRowCount Number of rows of detectors.
* @param _iDetectorColCount Number of columns detectors.
* @param _fDetectorWidth Width of a detector cell, in unit lengths. All detector cells are assumed to have equal width.
* @param _fDetectorHeight Height of a detector cell, in unit lengths. All detector cells are assumed to have equal width.
* @param _pfProjectionAngles Pointer to an array of projection angles. The angles will be copied from this array. All angles
* are represented in radians and lie in the [0,2pi[ interval.
*/
CConeProjectionGeometry3D(int _iProjectionAngleCount,
int _iDetectorRowCount,
int _iDetectorColCount,
float32 _fDetectorWidth,
float32 _fDetectorHeight,
const float32* _pfProjectionAngles,
float32 _fOriginSourceDistance,
float32 _fOriginDetectorDistance);
/** Copy constructor.
*/
CConeProjectionGeometry3D(const CConeProjectionGeometry3D& _projGeom);
/** Destructor.
*/
~CConeProjectionGeometry3D();
/** Initialize the geometry with a config object.
*
* @param _cfg Configuration Object
* @return initialization successful?
*/
virtual bool initialize(const Config& _cfg);
/** Initialize the geometry. If the object has been initialized before, the object is reinitialized
* and memory is freed and reallocated if necessary.
*
* @param _iProjectionAngleCount Number of projection angles.
* @param _iDetectorRowCount Number of rows of detectors.
* @param _iDetectorColCount Number of columns detectors.
* @param _fDetectorWidth Width of a detector cell, in unit lengths. All detector cells are assumed to have equal width.
* @param _fDetectorHeight Height of a detector cell, in unit lengths. All detector cells are assumed to have equal height.
* @param _pfProjectionAngles Pointer to an array of projection angles. The angles will be copied from this array. All angles
* are represented in radians and lie in the [0,2pi[ interval.
*/
bool initialize(int _iProjectionAngleCount,
int _iDetectorRowCount,
int _iDetectorColCount,
float32 _fDetectorWidth,
float32 _fDetectorHeight,
const float32* _pfProjectionAngles,
float32 _fOriginSourceDistance,
float32 _fOriginDetectorDistance);
/** Create a hard copy.
*/
virtual CProjectionGeometry3D* clone() const;
/** Return true if this geometry instance is the same as the one specified.
*
* @return true if this geometry instance is the same as the one specified.
*/
virtual bool isEqual(const CProjectionGeometry3D*) const;
/** Get all settings in a Config object.
*
* @return Configuration Object.
*/
virtual Config* getConfiguration() const;
/** Returns true if the type of geometry defined in this class is the one specified in _sType.
*
* @param _sType geometry type to compare to.
* @return true if _sType == "cone".
*/
virtual bool isOfType(const std::string& _sType) const;
/** Returns the distance from the origin of the coordinate system to the source.
*
* @return Distance from the origin of the coordinate system to the source
*/
float32 getOriginSourceDistance() const;
/** Returns the distance from the origin of the coordinate system to the detector
* (i.e., the distance between the origin and its orthogonal projection onto the detector array).
*
* @return Distance from the origin of the coordinate system to the detector
*/
float32 getOriginDetectorDistance() const;
/** Returns the distance from the source to the detector
* (i.e., the distance between the source and its orthogonal projection onto the detector array).
*
* @return Distance from the source to the detector
*/
float32 getSourceDetectorDistance() const;
/**
* Returns a vector giving the projection direction for a projection and detector index
*/
virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex) const;
virtual void projectPoint(double fX, double fY, double fZ,
int iAngleIndex,
double &fU, double &fV) const;
virtual void backprojectPointX(int iAngleIndex, double fU, double fV,
double fX, double &fY, double &fZ) const;
virtual void backprojectPointY(int iAngleIndex, double fU, double fV,
double fY, double &fX, double &fZ) const;
virtual void backprojectPointZ(int iAngleIndex, double fU, double fV,
double fZ, double &fX, double &fY) const;
};
// Returns the distance from the origin of the coordinate system to the source.
inline float32 CConeProjectionGeometry3D::getOriginSourceDistance() const
{
return m_fOriginSourceDistance;
}
// Returns the distance from the origin of the coordinate system to the detector.
inline float32 CConeProjectionGeometry3D::getOriginDetectorDistance() const
{
return m_fOriginDetectorDistance;
}
// Returns the distance from the source to the detector.
inline float32 CConeProjectionGeometry3D::getSourceDetectorDistance() const
{
return (m_fOriginSourceDistance + m_fOriginDetectorDistance);
}
} // namespace astra
#endif /* _INC_ASTRA_CONEPROJECTIONGEOMETRY3D */
|
