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annotate OrthancStone/Sources/Toolbox/DicomStructure2.h @ 1716:6aadc7cbb8ea

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 01 Dec 2020 08:58:53 +0100
parents 8563ea5d8ae4
children 9ac2a65d4172
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22 #pragma once
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23
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24 #ifdef BGO_ENABLE_DICOMSTRUCTURESETLOADER2
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25
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26 #include "DicomStructurePolygon2.h"
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27 #include "DicomStructureSetUtils.h"
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28
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29 namespace OrthancStone
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30 {
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31
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32 /*
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33 A structure has a color, a name, a set of slices..
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34
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35 Each slice is a polygon.
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36 */
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37 struct DicomStructure2
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38 {
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39 DicomStructure2() :
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40 red_(0), green_(0), blue_(0), sliceThickness_(0), state_(Building) {}
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41
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42 void AddPolygon(const DicomStructurePolygon2& polygon);
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43
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44 /**
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45 Once all polygons have been added, this method will determine:
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46 - the slice orientation (through the normal vector)
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47 - the spacing between slices (slice thickness)
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48
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49 it will also set up the info required to efficiently compute plane
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50 intersections later on.
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51 */
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52 void ComputeDependentProperties();
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53
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54 /**
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55 Being given a plane that is PARALLEL to the set of polygon structures, this
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56 returns a pointer to the polygon located at that position (if it is closer
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57 than thickness/2) or NULL if there is none.
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58
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59 TODO: use sorted vector to improve
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60
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61 DO NOT STORE THE RETURNED POINTER!
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62 */
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63 const DicomStructurePolygon2* GetPolygonClosestToSlice(const CoordinateSystem3D& plane) const;
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64
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65 Vector GetNormal() const;
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66
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67 Color GetColor() const
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68 {
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69 return Color(red_, green_, blue_);
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70 }
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71
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72 bool IsValid() const
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73 {
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74 return state_ == Valid;
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75 }
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76
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77 /**
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78 This method is used to project the 3D structure on a 2D plane.
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79
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80 A structure is a stack of polygons, representing a volume.
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81
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82 We need to compute the intersection between this volume and the supplied
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83 cutting plane (the "slice"). This is more than a cutting plane: it is also
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84 a 2D-coordinate system (the plane has axes vectors)
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85
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86 The cutting plane is always parallel to the plane defined by two of the
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87 world coordinate system axes.
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88
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89 The result is a set of closed polygons.
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90
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91 If the cut is parallel to the polygons, we pick the polygon closest to
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92 the slice, project it on the slice and return it in slice coordinates.
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93
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94 If the cut is perpendicular to the polygons, for each polygon, we compute
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95 the intersection between the cutting plane and the polygon slab (imaginary
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96 volume created by extruding the polygon above and below its plane by
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97 thickness/2) :
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98 - each slab, intersected by the plane, gives a set of 0..* rectangles \
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99 (only one if the polygon is convex)
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100 - when doing this for the whole stack of slabs, we get a set of rectangles:
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101 To compute these rectangles, for each polygon, we compute the intersection
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102 between :
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103 - the line defined by the intersection of the polygon plane and the cutting
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104 plane
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105 - the polygon itself
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106 This yields 0 or 2*K points along the line C. These are turned into K
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107 rectangles by taking two consecutive points along the line and extruding
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108 this segment by sliceThickness/2 in the orientation of the polygon normal,
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109 in both directions.
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110
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111 Then, once this list of rectangles is computed, we need to group the
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112 connected rectangles together. Connected, here, means sharing at least part
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113 of an edge --> union/find data structures and algorithm.
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114 */
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115 bool Project(std::vector< std::pair<Point2D, Point2D> >& polygons, const CoordinateSystem3D& plane) const;
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116
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117 std::string interpretation_;
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118 std::string name_;
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119 uint8_t red_;
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120 uint8_t green_;
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121 uint8_t blue_;
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122
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123 /** Internal */
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124 const std::vector<DicomStructurePolygon2>& GetPolygons() const
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125 {
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126 return polygons_;
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127 }
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128
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129 /** Internal */
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130 double GetSliceThickness() const
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131 {
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132 return sliceThickness_;
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133 }
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134
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135 private:
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136 enum State
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137 {
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138 Building,
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139 NormalComputed,
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140 Valid, // When normal components AND slice thickness are computed
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141 Invalid
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142 };
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143
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144 void ComputeNormal();
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145 void ComputeSliceThickness();
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146
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147 std::vector<DicomStructurePolygon2> polygons_;
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148 Vector3D normal_;
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149 double sliceThickness_;
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150
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151 /*
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152 After creation (and while polygons are added), state is Building.
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153 After ComputeDependentProperties() is called, state can either be
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154 Valid or Invalid. In any case, the object becomes immutable.
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155 */
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156 State state_;
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157 };
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158 }
1019
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159
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160 #endif
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161 // BGO_ENABLE_DICOMSTRUCTURESETLOADER2
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162