Primary Positioner Increment Sign Attribute
| Tag | (0018,9518) |
|---|---|
| Type | Optional (3) |
| Keyword | PrimaryPositionerIncrementSign |
| Value Multiplicity | 1 |
| Value Representation | Signed Short (SS) |
Direction of the primary positioner rotation.
Defined Terms:
- +1
-
indicates a positive primary positioner angle increment
- -1
-
indicates a negative primary positioner angle increment
See Section C.8.7.5.1.2 or Section C.8.11.7 for the sign conventions depending on modality and positioner type.
See Section C.8.21.3.1.3.1 for further explanation.
Section C.8.7.5.1.2
C.8.7.5.1.2 Positioner Primary and Secondary Angles
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.
Figure C.8-11. Positioner Primary Angle
Figure C.8-12. Positioner Secondary Angle
Section C.8.11.7
C.8.11.7 Mammography Image Module
Table C.8-74 specifies the Attributes of the Mammography Image Module, which describe a Digital Mammography X-Ray Image including its acquisition and positioning.
Table C.8-74. Mammography Image Module Attributes
|
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:
|
|
Distance Source to Detector |
(0018,1110) |
3 |
Distance in mm from source to detector center on the chest wall line Note
|
|
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
|
|
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:
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:
Shall be consistent with any laterality information contained in Primary Anatomic Structure Modifier Sequence (0008,2230) and/or Laterality (0020,0060), if present. NoteLaterality (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:
NoteIn 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:
NoteThe 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:
If this Attribute is absent, then the image may or may not be a partial view. NoteThis 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 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” . |
|||
|
>View Modifier Code Sequence |
(0054,0222) |
2 |
View modifier. Zero or more Items shall be included in this Sequence. |
|
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. NoteTo 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
|
|
>Target Label |
(0018,2045) |
3 |
Target description. |
C.8.11.7.1 Mammography Image Module Attribute Descriptions
C.8.11.7.1.1 Mammography X-Ray Beam and X-Ray Beam Vector Definition
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.
Figure C.8.11.7-1. X-Ray Beam for a Digital Mammography System
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 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.
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 |
|
|
A) Item 1 = Posterior B) Item 1 = Anterior |
|
|
A) Item 1 = Lateral, Item 2 = Posterior B) Item 1 = Medial, Item 2 = Posterior C) Item1 = Anterior |
|
|
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 |
|
|
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 |
|
Figure C.8.11.7-2. CC, FB, XCCL and XCCM partial views
Note
If six images are required, then the "Central, Anterior" combination would be added.
|
Partial View Code Sequence Items (Code Meaning) |
Partial View Images (A, B, C, D, E) |
|---|---|
|
A) Item 1 = Superior B) Item 1 = Inferior |
|
|
A) Item 1 = Posterior B) Item 1 = Anterior |
|
|
A) Item 1 = Superior, Item 2 = Posterior B) Item1 = Inferior, Item 2 = Posterior C) Item 1 = Anterior |
|
|
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 |
|
|
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 |
|
Figure C.8.11.7-3. ML, MLO, LM, LMO, SIO and ISO partial views
Note
If six images are required, then the "Central, Anterior" combination would be added.
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, digital breast tomosynthesis projection or generated 2D image, or contrast enhanced image.
Note
-
In a previous version of PS3.3, 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, digital breast tomosynthesis projection or generated 2D image, or contrast enhanced image, if the Instance was created before these terms were defined.
-
See Section 6.4 “Value Multiplicity (VM) and Delimitation” in PS3.5 for a description of value delimitation.
The Enumerated Values for Value 3 of stereotactic mammography images are listed in Table C.8-74a.
Table C.8-74a. Enumerated Values of 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 |
|
POSTMARKER_MINUS |
The image obtained following micromarker placement with the X-Ray source angle decreased from the scout position. |
…POM- |
|
POSTMARKER_PLUS |
The image obtained following micromarker placement with the X-Ray source angle increased from the scout position. |
…POM+ |
|
POSTMARKER |
The image obtained following micromarker placement with the X-Ray source in the scout position. |
…POM |
The Enumerated Values for Value 3 of digital breast tomosynthesis projection images and mathematically generated 2D images are:
Table C.8-74b. Enumerated Values of Image Type (0008,0008) Value 3 for Digital Breast Tomosynthesis Projection and Generated 2D Images
|
Enumerated Value |
Definition |
ACR MQCM Equivalent |
|---|---|---|
|
TOMO_PROJ |
Identifies the image as a digital breast tomosynthesis projection image. |
n/a |
|
TOMOSYNTHESIS |
Identifies the image as digital breast tomosynthesis; shall be used only for generated 2D images when no other Value 3 takes precedence. |
n/a |
|
TOMO_SCOUT |
A localizer image that may be used to determine positioning coordinates prior to needle positioning. |
…SC |
|
PREFIRE |
The image obtained with the biopsy needle in position prior to needle deployment. |
…PRF |
|
POSTFIRE |
The image obtained with the biopsy needle in position following needle deployment through the targeted lesion. |
…POF |
|
POSTBIOPSY |
The image obtained following tissue acquisition with the X-Ray source in the scout position. |
…POB |
|
POSTMARKER |
The image obtained following micromarker placement with the X-Ray source in the scout position. |
…POM |
Note
Digital breast tomosynthesis projection images acquired as part of a biopsy procedure (and resulting derived images such as mathematically generated 2D) omit the _MINUS and _PLUS endings because a single digital breast tomosynthesis acquisition produces a set of projection images that replaces the _MINUS and _PLUS image pair used in conventional 2D breast biopsy imaging.
The Enumerated Values for Value 3 of contrast enhanced images are:
Table C.8-74c. Enumerated Values of Image Type (0008,0008) Value 3 for Contrast Enhanced Images
|
Enumerated Value |
Definition |
|---|---|
|
PRE_CONTRAST |
Collected before contrast was administered. |
|
POST_CONTRAST |
Collected during or after contrast was administered. |
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.
Note
For example, Attributes of the Contrast/Bolus Module may be used to identify contrast enhanced characteristics of a biopsy and/or tomosynthesis projection or generated 2D image that is also contrast enhanced.
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.
Table C.8-74d. Defined Terms of Image Type (0008,0008) Value 4 for Contrast Enhanced and Generated 2D Images
|
Defined Terms |
Definition |
|---|---|
|
GENERATED_2D |
Mathematically generated 2D view. |
|
ADDITION |
Created through Pixel by pixel addition operation. |
|
SUBTRACTION |
Created through Pixel by pixel subtraction operation. |
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.
Table C.8-74e. Defined Terms of Image Type (0008,0008) Value 5 for Contrast Enhanced 2D Images
|
Defined Terms |
Definition |
|---|---|
|
LOW_ENERGY |
Low energy image. |
|
HIGH_ENERGY |
High energy image. |
Note
-
A recipient may use the different values for biopsy, tomosynthesis and contrast views to determine how to display them, for example in hanging protocols. See examples in Table C.8-74f.
-
The entry "empty" in the table indicates that the value is present with zero length and a preceding delimiter (e.g. "Pre-contrast 2D" has two empty values at the end and would be expressed as ORIGINAL\PRIMARY\PRE_CONTRAST\\). Other empty or non-empty values may follow an empty value.
-
The entry "-" in the table indicates that the value is not present and neither is its preceding delimiter (e.g. "Stereotactic post-biopsy" has two absent values at the end and would be expressed as ORIGINAL\PRIMARY\POSTBIOPSY). No other values may follow an absent value.
Table C.8-74f. Example Image Type Values for Mammography Biopsy, Tomosynthesis and Contrast Views (Informative)
|
|
Image Type (0008,0008) Value 3 |
Image Type (0008,0008) Value 4 |
Image Type (0008,0008) Value 5 |
|---|---|---|---|
|
Conventional 2D mammography |
empty |
- |
- |
|
Stereotactic post-biopsy |
POSTBIOPSY |
- |
- |
|
Pre-contrast 2D |
PRE_CONTRAST |
empty |
empty |
|
Post-contrast 2D low energy |
POST_CONTRAST |
empty |
LOW_ENERGY |
|
Post-contrast 2D addition |
POST_CONTRAST |
ADDITION |
empty |
|
Stereotactic scout pre-contrast |
STEREO_SCOUT |
empty |
empty |
|
Stereotactic stereo post-contrast high energy |
STEREO_PLUS |
empty |
HIGH_ENERGY |
|
Stereotactic post-fire post-contrast subtraction |
POSTFIRE_MINUS |
SUBTRACTION |
empty |
|
Tomosynthesis generated 2D |
TOMOSYNTHESIS |
GENERATED_2D |
- |
|
Tomosynthesis biopsy scout generated 2D |
TOMO_SCOUT |
GENERATED_2D |
- |
|
Tomosynthesis generated 2D post-contrast low energy |
TOMOSYNTHESIS |
GENERATED_2D |
LOW_ENERGY |
|
Tomosynthesis generated 2D post-contrast subtraction |
TOMOSYNTHESIS |
SUBTRACTION |
empty |
|
Tomosynthesis projection |
TOMO_PROJ |
- |
- |
|
Tomosynthesis projection post-biopsy |
POSTBIOPSY |
- |
- |
|
Tomosynthesis projection post-biopsy post-contrast subtraction |
POSTBIOPSY |
SUBTRACTION |
empty |
Section C.8.21.3.1.3.1
C.8.21.3.1.3.1 Positioner Angle Increments
If the increments of the positioner angles are constant during the acquisition of the X-Ray projections, the Attributes Primary Positioner Increment (0018,9514) and the Secondary Positioner Increment (0018,9515) describe this angular change between projections.
If the change in positioner angle is not constant between the projections, omit the Positioner Angle Increment Attributes and record the individual positioner angle values in the Positioner Angle Attributes within each Item of the Per Projection Acquisition Sequence (0018,9538). In such case, the Attributes Primary Positioner Increment Sign (0018,9518) and Secondary Positioner Increment Sign (0018,9519) are used to describe the direction of the positioner rotation.