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Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 19 March 2024. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Detector Active Area TLHC Position Attribute

Tag(0018,9557)
TypeConditionally Required (1C)
KeywordDetectorActiveAreaTLHCPosition
Value Multiplicity3
Value RepresentationDouble (FD)

The x, y, and z coordinates in mm of the center of the top left hand corner detector element of the detector active area in the Detector coordinate system.

See C.8.31.6.1.5 for further explanation.

Required if Presentation Intent Type (0008,0068) = FOR PROCESSING. May be present otherwise.

Note

Part of the Breast X-Ray Isocenter Reference System Functional Group Macro with usage: M

C.8.31.6.1.5

C.8.31.6.1.5 Detector Active Area Relationship

The image and planes in conventional mammography and digital breast tomosynthesis are expressed in relation to Detector FOV and Detector Active area (see C.8.11.4.1.1). As manufacturers design their systems differently, the detector may be mounted or positioned differently in different breast imaging systems. As a result, the TLHC position of the Detector Active Area, together with row and column directions, must be specified (see Figure C.8.31.6-12). The relationship between the Detector Active Area TLHC, the row and column directions of the Active Area, and the Field of View and Detector Coordinate System (defined in C.8.31.6.1.4) is defined by two Attributes.

  • Detector Active Area TLHC Position (0018,9557) specifies the x, y and z coordinates in mm of the center of the pixel defined as Detector Active Area TLHC within the Detector coordinate system, where the Z-direction value is always 0 since the detector itself is in XdYd plane. A value of Detector Active Area TLHC Position (0018,9557) = (0,0,0) means that the Detector Active Area TLHC Position is at the origin Od of the Detector coordinate system.

  • Detector Active Area Orientation (0018,9558) specifies the direction cosines of the first row followed by the direction cosines of the first column within the Detector coordinate system. The first three values contain the cosine of the angle between the first row and the Xd, Yd and Zd axes, respectively. The next three values contain the cosine of the angle between the first column and the Xd, Y d and Zd axes, respectively.

Figure C.8.31.6-12. Examples of Detector Active Area TLHC Position and Orientation


In Figure C.8.31.6-12, the left picture illustrates Detector Active Area Orientation (0018,9558) = (0,-1,0,-1,0,0), while the right picture illustrates Detector Active Area Orientation (0018,9558) = (0,1,0,1,0,0).