(0018,1700) 
Collimator Shape 
1

Shape(s) of the collimator. Enumerated Values: RECTANGULAR CIRCULAR POLYGONAL This multivalued Attribute shall contain at most one of each Enumerated Value. 
(0018,1702) 
Collimator Left Vertical Edge 
1C

Required if Collimator Shape (0018,1700) is RECTANGULAR. Location of the left edge of the rectangular collimator with respect to pixels in the image given as column. See C.8.7.3.1.1. 
(0018,1704) 
Collimator Right Vertical Edge 
1C

Required if Collimator Shape (0018,1700) is RECTANGULAR. Location of the right edge of the rectangular collimator with respect to pixels in the image given as column. See C.8.7.3.1.1. 
(0018,1706) 
Collimator Upper Horizontal Edge 
1C

Required if Collimator Shape (0018,1700) is RECTANGULAR. Location of the upper edge of the rectangular collimator with respect to pixels in the image given as row. See C.8.7.3.1.1. 
(0018,1708) 
Collimator Lower Horizontal Edge 
1C

Required if Collimator Shape (0018,1700) is RECTANGULAR. Location of the lower edge of the rectangular collimator with respect to pixels in the image given as row. See C.8.7.3.1.1. 
(0018,1710) 
Center of Circular Collimator 
1C

Required if Collimator Shape (0018,1700) is CIRCULAR. Location of the center of the circular collimator with respect to pixels in the image given as row and column. See C.8.7.3.1.1. 
(0018,1712) 
Radius of Circular Collimator 
1C

Required if Collimator Shape (0018,1700) is CIRCULAR. Radius of the circular collimator with respect to pixels in the image given as a number of pixels along the row direction. See C.8.7.3.1.1. 
(0018,1720) 
Vertices of the Polygonal Collimator 
1C

Required if Collimator Shape (0018,1700) is POLYGONAL. Multiple Values where the first set of two values are: row of the origin vertex; column of the origin vertex. Two or more pairs of values follow and are the row and column coordinates of the other vertices of the polygon collimator. Polygon collimators are implicitly closed from the last vertex to the origin vertex and all edges shall be nonintersecting except at the vertices. 