DICOM Standard Browser

Attribute Name	Tag	Type	Attribute Description
Distance Source to Patient	(0018,1111)	3	Distance in mm from source to center of field of view. Note This value is traditionally referred to as Source Object Distance (SOD). For cardiovascular image equipment the SOD value typically is the distance from source to isocenter.
Distance Source to Detector	(0018,1110)	3	Distance in mm from source to detector center. Note This value is traditionally referred to as Source Image Receptor Distance (SID).
Estimated Radiographic Magnification Factor	(0018,1114)	3	Ratio of Source Image Receptor Distance (SID) over Source Object Distance (SOD).
Positioner Motion	(0018,1500)	2C	Used to describe the activity of the imaging devices. Defined Terms: DYNAMIC STATIC See Section C.8.7.5.1.1. Required if Pixel Data (7FE0,0010) contains more than one frame. May be present otherwise.
Positioner Primary Angle	(0018,1510)	2	Position of the X-Ray Image Intensifier about the patient from the RAO to LAO direction where movement from RAO to vertical is positive. See Section C.8.7.5.1.2.
Positioner Secondary Angle	(0018,1511)	2	Position of the X-Ray Image Intensifier about the patient from the CAU to CRA direction where movement from CAU to vertical is positive. See Section C.8.7.5.1.2
Positioner Primary Angle Increment	(0018,1520)	2C	Incremental change in primary positioner angle for each frame. See Section C.8.7.5.1.3. Required if Positioner Motion (0018,1500) equals DYNAMIC.
Positioner Secondary Angle Increment	(0018,1521)	2C	Incremental change in secondary positioner angle for each frame. See Section C.8.7.5.1.3. Required if Positioner Motion (0018,1500) equals DYNAMIC.
Detector Primary Angle	(0018,1530)	3	Angle of the X-Ray beam in the row direction in degrees relative to the normal to the detector plane. Positive values indicate that the X-Ray beam is tilted towards higher numbered columns. Negative values indicate that the X-Ray beam is tilted towards lower numbered columns. See Section C.8.7.5.1.4.
Detector Secondary Angle	(0018,1531)	3	Angle of the X-Ray beam in the column direction in degrees relative to the normal to the detector plane. Positive values indicate that the X-Ray beam is tilted towards lower numbered rows. Negative values indicate that the X-Ray beam is tilted towards higher numbered rows. See Section C.8.7.5.1.4.

Positioner Motion (0018,1500) Attribute is STATIC if the imaging table moves during a multi-frame acquisition, but the X-Ray positioner do not move.

If Pixel Data (7FE0,0010) contains a single frame and a value of Positioner Motion (0018,1500) is provided, the value shall be STATIC.

The definitions of Positioner Angles shall be with respect to the patient as illustrated in Figure C.8-11 and Figure C.8-12. Zero degree is referenced to the origin perpendicular to the patient's chest. The Positioner Primary Angle definition is like longitude (in the equatorial plan); the Positioner Secondary Angle definition is like latitude (in the sagittal plane). The Positioner Angle Attributes apply to the first frame of a multi-frame image. The valid range of Primary Positioner Angle is -180 to +180 degrees and the Secondary Positioner Angle range is -90 to + 90 degrees.

The Patient Plane is defined by the isocenter of the imaging device and slices through the patient such that it is perpendicular to the sagittal plane of the body. The Primary Axis of rotation is defined at the intersection of the Patient Plane and of the Sagittal Plane. The Positioner Primary Angle is defined in the transaxial plane at the isocenter with zero degrees in the direction perpendicular to the patient's chest and + 90 degrees at the patient left hand side (LAO) and -90 at the patient right hand side (RAO). The valid range of Primary Positioner Angle is -180 to +180 degrees.

The Secondary Axis is in the Patient Plane and is perpendicular to the Primary Axis at the isocenter. The Positioner Secondary Angle is defined in the Sagittal Plane at the isocenter with zero degrees in the direction perpendicular to the patient's chest. +90 degrees corresponds to the cranial direction. The Secondary Positioner Angle range is -90 to + 90 degrees.

At a 0 angle for both Primary Angle (0018,1510) and Secondary Angle (0018,1511), the patient faces the Image Intensifier or digital detector.

The Positioner Primary Angle (0018,1510) and Secondary Angle (0018,1511) apply to the first frame of a multi-frame image.

If the positioner angles change during acquisition of a multi-frame image, the Positioner Angle Increment Attributes describe the angular change per frame.

If the change in positioner angle is nominally constant for each frame, these fields may contain a single value of the average angular change per frame. Alternatively, the fields may contain a vector of offsets from the (initial) Positioner Angle Attributes, with one value for each frame in the multi-frame image. The number of values in the Positioner Angle Increment Attributes must be one, or must be equal to Number of Frames (0028,0008) in the Multi-frame Module (see Section C.7.6.6).

Detector Angles are defined in a fashion similar to the positioner angles, except that the angle of the central X-Ray beam vector is relative to the Detector Plane rather than the Patient Plane. The central X-Ray beam vector is defined as the vector from the X-Ray source through the isocenter to the detector plane. Zero degree is referenced to the normal to the detector plane pointing away from the X-Ray source. The Detector Angle Attributes apply to the first frame of a multi-frame image. The valid range of the Detector Angles is -90 to + 90 degrees.

The Primary Axis of rotation is defined along the line in the column direction of the detector plane that intersects the central X-Ray beam vector. The Detector Primary Angle is defined in the plane perpendicular to the Primary Axis of rotation at the point where the central X-Ray beam vector intersects the detector plane, with zero degrees in the direction normal to the detector plane and -90 degrees at the left hand side of the image (i.e., toward column 1) and +90 at the right hand side of the image (i.e., toward the highest numbered column). The valid range of Primary Detector Angle is -90 to +90 degrees.

The Secondary Axis is in the detector plane and is perpendicular to the Primary Axis at the intersection of the beam vector with the detector plane (i.e., it is along the row direction). The Detector Secondary Angle is defined in the plane perpendicular to the Secondary Axis at the point where the central X-Ray beam vector intersects the detector plane, with zero degrees in the direction normal to the detector plane. +90 degrees corresponds to the direction toward the top of the image. The Secondary Detector Angle range is -90 to + 90 degrees.

Attribute Name	Tag	Type	Attribute Description
Image Type	(0008,0008)	1	Image identification characteristics. See Section C.8.11.7.1.4 for specialization.
Positioner Type	(0018,1508)	1	Enumerated Values: MAMMOGRAPHIC NONE
Distance Source to Detector	(0018,1110)	3	Distance in mm from source to detector center on the chest wall line Note This value is traditionally referred to as Source Image Distance (SID). See Section C.8.11.7.1.1.
Distance Source to Patient	(0018,1111)	3	Distance in mm from source to the breast support side that is closest to the Imaging Subject, as measured along the X-Ray beam vector. Note This value is traditionally referred to as Source Object Distance (SOD). See notes for this Attribute in Section C.8.11.5 DX Positioning Module. See Section C.8.11.7.1.1 for description of X-Ray beam vector.
Positioner Primary Angle	(0018,1510)	3	Signed position in degrees of the X-Ray beam vector in the coronal anatomical plane as if the patient were standing facing the equipment where vertical is zero.
Positioner Primary Angle Direction	(0018,9559)	3	The interpretation of the sign of the Positioner Primary Angle (0018,1510). Enumerated Values: CW Clockwise. Positioner Primary Angle movement is positive when movement is from vertical to the patient's right (with patient standing, facing equipment). CC Counter clockwise. Positioner Primary Angle is positive when movement is from vertical to the patient's left (with patient standing, facing the equipment). See Section C.8.31.2.1.
Positioner Secondary Angle	(0018,1511)	3	Position in degrees of the X-Ray beam vector in the sagittal anatomical plane as if the patient were standing where movement of the X-Ray source from anterior to posterior is positive, and vertical is zero.
Image Laterality	(0020,0062)	1	Laterality of the region examined. Enumerated Values: R right L left B both (e.g., cleavage) Shall be consistent with any laterality information contained in Primary Anatomic Structure Modifier Sequence (0008,2230) and/or Laterality (0020,0060), if present. Note Laterality (0020,0060) is a Series level Attribute and must be the same for all Images in the Series, hence it must be absent if Image Laterality (0020,0062) has different values for Images in the same Series.
Organ Exposed	(0040,0318)	1	Organ to which Organ Dose (0040,0316) applies. Enumerated Values: BREAST Note In the Mammography IOD, Organ Dose (0040,0316) refers to the mean glandular dose.
Breast Implant Present	(0028,1300)	3	Whether or not the imaged breast contains a breast implant regardless of the visibility of a breast implant in the Pixel Data. Enumerated Values: YES NO Note The value is expected to be YES for all images acquired on a breast that contains a breast implant, even when a breast implant is displaced during image acquisition.
Partial View	(0028,1350)	3	Indicates whether this image is a partial view, that is a subset of a single view of the breast. Enumerated Values: YES NO If this Attribute is absent, then the image may or may not be a partial view. Note This may occur when a breast is larger than the active area of the detector. If this Attribute is present, its value shall be NO if there is a View Modifier Code Sequence (0054,0222) Item of value (399163009, SCT, "Magnification") or (399055006, SCT, "Spot Compression").
Partial View Description	(0028,1351)	3	Free text description of the portion of the breast captured in a partial view image. This Attribute shall not be present if there is a View Modifier Code Sequence (0054,0222) Item of value (399163009, SCT, "Magnification") or (399055006, SCT, "Spot Compression").
Partial View Code Sequence	(0028,1352)	3	Sequence that describes the portion or section of the breast captured in a partial view image. Only one or two Items are permitted in this Sequence. See Section C.8.11.7.1.3. If this Attribute is absent, then the image may or may not be a partial view. This Attribute shall not be present if there is a View Modifier Code Sequence (0054,0222) Item of value (399163009, SCT, "Magnification") or (399055006, SCT, "Spot Compression").
>Include Table 8.8-1 “Code Sequence Macro Attributes”			DCID 4005 “Partial View Section for Mammography”.
Include Table 10-5 “General Anatomy Mandatory Macro Attributes”			Anatomic Region Sequence DCID 4013 “Anatomic Region for Mammography”.
View Code Sequence	(0054,0220)	1	Sequence that describes the projection of the anatomic region of interest on the image receptor. Only a single Item shall be included in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes” .			DCID 4014 “View for Mammography”.
>View Modifier Code Sequence	(0054,0222)	2	View modifier. Zero or more Items shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes”			DCID 4015 “View Modifier for Mammography”.
Biopsy Target Sequence	(0018,2041)	3	Sequence that identifies the targets of a biopsy procedure. One or more Items are permitted in this Sequence, where the coordinate system is the same for all Items within a pair of stereo images.
>Target UID	(0018,2042)	1	Unique identifier for the target. Note To identify the same target in corresponding minus and plus stereo images.
>Localizing Cursor Position	(0018,2043)	1	Coordinates of localizing cursor position with respect to pixels in the image specified by a column (delimiter) row pair. The values shall be in the range 0\0 (TLHC) to Columns\Rows (BRHC).
>Calculated Target Position	(0018,2044)	1	The calculated target position (x, y, z) in mm in an equipment relative right-handed coordinate system where the origin is under the central X-Ray beam at the chest wall, and a z value of zero is located at the surface that the breast is in contact with that is closest to the detector. X is parallel to the chest wall, y is positive toward the patient's nipple, and z is positive toward the X-Ray source.
>Displayed Z Value	(0018,2046)	1	The z value in mm displayed to the user at the time of biopsy. Note This may be the same as the z value of Calculated Target Position or different in direction or reference point, such as relative to the compression paddle. This is not the distance that the needle was inserted, particularly for a lateral (parallel) approach.
>Target Label	(0018,2045)	3	Target description.

Figure C.8.11.7-1 shows the X-Ray beam for a digital mammography system. The X-Ray beam vector is defined from the Focal Spot to the center of the chest wall line of the Image Detection device.

Detector Angles are defined in a fashion similar to the positioner angles, except that the angle of the X-Ray beam vector is relative to the detector plane rather than the patient plane. Zero degrees is referenced to the normal of the detector plane pointing toward the X-Ray source. The valid range of the Detector Angles is -90 to + 90 degrees.

The Primary Axis of rotation is defined along the line in the column direction of the detector plane that intersects the X-Ray beam vector. The Detector Primary Angle is defined in the plane perpendicular to the Primary Axis of rotation at the point where the X-Ray beam vector intersects the detector plane, with zero degrees in the direction normal to the detector plane and +90 in the direction of the higher numbered columns of the detector in that plane. The valid range of Detector Primary Angle is -90 to +90 degrees.

The Secondary Axis is in the detector plane and is perpendicular to the Primary Axis at the intersection of the beam vector with the detector plane (i.e., it is along the row direction). The Detector Secondary Angle is defined in the plane perpendicular to the Secondary Axis at the point where the X-Ray beam vector intersects the detector plane, with zero degrees in the direction normal to the detector plane. +90 degrees corresponds to the direction of the lower numbered rows of the detector in that plane. The Detector Secondary Angle range is -90 to + 90 degrees.

Combinations of coded terms may be used in the Partial View Code Sequence (0028,1352) to express the breast section imaged. Figure C.8.11.7-2 shows examples for the right and left FB, XCC, XCCL and XCCM views, and Figure C.8.11.7-3 shows examples for the right and left ML, MLO, LM, LMO, SIO and ISO views.

Image Type (0008,0008) Value 1 and Value 2 shall identify the Pixel Data Characteristics in accordance with Section C.8.11.3.1.1.

Value 3 shall be present and have zero length (null value), except when used to identify a stereotactic mammography image, digital breast tomosynthesis projection or generated 2D image, or contrast enhanced image.

The Enumerated Values for Value 3 of stereotactic mammography images are listed in Table C.8-74a.

The Enumerated Values for Value 3 of digital breast tomosynthesis projection images and mathematically generated 2D images are:

The Enumerated Values for Value 3 of contrast enhanced images are:

If more than one characteristic (biopsy, tomosynthesis, contrast enhanced) applies to an image, Value 3 shall contain the biopsy image type. If biopsy is not involved, Value 3 shall contain the tomosynthesis image type.

Value 4 shall be present for images acquired using contrast enhanced digital X-Ray imaging of the breast (but may be empty or absent if none of the Defined Terms applies), and for mathematically generated 2D images. For other images Value 4 remains optional and implementation specific.

If more than one characteristic (contrast enhanced, tomosynthesis) applies to an image, Value 4 shall contain the contrast enhanced image type. If contrast enhanced is not involved, Value 4 shall contain the generated 2D image type.

Value 5 shall be present for images acquired using contrast enhanced digital X-Ray imaging of the breast, but may be empty or absent if none of the Defined Terms applies. For non-contrast images Value 5 remains optional and implementation specific.