C.8.11.7.1 Mammography Image Attribute Descriptions

C.8.11.7.1.1 Mammography X-Ray Beam and X-Ray Beam Vector Definition

Figure C.8-8 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.

[pic]

Figure C.8-8

C.8.11.7.1.2 Detector Primary and Secondary Angles

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 which 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.

C.8.11.7.1.3 Partial View Code Sequence

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.

Partial View Code Sequence Items (Code Meaning) Partial View Images (A, B, C, D, E)
A) item 1 = Lateral B) item 1 = Medial [pic]
A) item 1 = Posterior B) item 1 = Anterior [pic]
A) item 1 = Lateral, item 2 = Posterior B) item 1 = Medial, item 2 = Posterior C) item1 = Anterior [pic]
A) item 1 = Lateral, item 2 = Posterior B) item 1 = Medial, item 2 = Posterior C) item 1 = Lateral, item 2 = Anterior D) item 1 = Medial, item 2 = Anterior [pic]
A) item 1 = Lateral, item 2 = Posterior B) item 1 = Central, item 2 = Posterior C) item 1 = Medial, item 2 = Posterior D) item 1 = Lateral, item 2 = Anterior E) item 1 = Medial, item 2 = Anterior [pic]

Note: If six images are required, then the “Central, Anterior” combination would be added.

Figure C.8.11.7-2 - CC, FB, XCCL and XCCM partial views

Partial View Code Sequence Items (Code Meaning) Partial View Images (A, B, C, D, E)
A) item 1 = Superior B) item 1 = Inferior [pic]
A) item 1 = Posterior B) item 1 = Anterior [pic]
A) item 1 = Superior, item 2 = Posterior B) item1 = Inferior, item 2 = Posterior C) item 1 = Anterior [pic]
A) item 1 = Superior, item 2 = Posterior B) item 1 = Inferior, item 2 = Posterior C) item 1 = Superior, item 2 = Anterior D) item 1 = Inferior, item 2 = Anterior [pic]
A) item 1 = Superior, item 2 = Posterior B) item 1 = Central, item 2 = Posterior C) item 1 = Inferior, item 2 = Posterior D) item 1 = Superior, item 2 = Anterior E) item 1 = Inferior, item 2 = Anterior [pic]

Note: If six images are required, then the “Central, Anterior” combination would be added.

Figure C.8.11.7-3 - ML, MLO, LM, LMO, SIO and ISO partial views

C.8.11.7.1.4 Image Type

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.

Note: In a previous version of PS 3.3, Value 3 was required to be zero length (null value). If Value 3 is zero length, the image may or may not be a stereotactic mammography image, if the Instance was created before these terms were defined.

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

Table C.8-74a

Image Type (0008,0008) Value 3 for stereotactic mammography

Enumerated Value Definition ACR MQCM Equivalent
STEREO_SCOUT A localizer image for a stereotactic acquisition. …SC
STEREO_MINUS The paired image obtained with the X-Ray source angle decreased from the scout position, to determine positioning coordinates prior to needle positioning. …ST-
STEREO_PLUS The paired image obtained with the X-Ray source angle increased from the scout position, to determine positioning coordinates prior to needle positioning. …ST+
PREFIRE_MINUS The paired image obtained with the X-Ray source angle decreased from the scout position, with the biopsy needle in position prior to needle deployment. …PRF-
PREFIRE_PLUS The paired image obtained with the X-Ray source angle increased from the scout position, with the biopsy needle in position prior to needle deployment. …PRF+
POSTFIRE_MINUS The paired image obtained with the X-Ray source angle decreased from the scout position, with the biopsy needle in position following needle deployment through the targeted lesion. …POF-
POSTFIRE_PLUS The paired image obtained with the X-Ray source angle increased from the scout position, with the biopsy needle in position following needle deployment through the targeted lesion. …POF+
POSTBIOPSY_MINUS The image obtained following tissue acquisition with the X-Ray source angle decreased from the scout position. …POB-
POSTBIOPSY_PLUS The image obtained following tissue acquisition with the X-Ray source angle increased from the scout position. …POB+
POSTBIOPSY The image obtained following tissue acquisition with the X-Ray source in the scout position. …POB