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CP-1475 - Add patient defined term for Ultrasound Acquisition Geometry
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Status
Letter Ballot
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Date of Last Update
2015/06/19
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Person Assigned
David Clunie
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mailto:[email protected]
Submitter Name
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David Clunie
mailto:[email protected]
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Submission Date
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Correction Number CP-1475
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Log Summary: Add patient defined term for Ultrasound Acquisition Geometry
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Name of Standard
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PS3.3
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Rationale for Correction:
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The Enhanced US Volume object added an Ultrasound Frame Of Reference Module with a descriptive term describing the characteristic
of the ultrasound acquisition geometry.
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It is useful to be able to identify when the geometry is patient relative, to signal that the geometry is the same as the patient-relative
coordinate system.
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Correction Wording:
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2015/02/27
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CP-1475 - Add patient defined term for Ultrasound Acquisition Geometry
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Amend DICOM PS3.3 as follows (changes to existing text are bold and underlined for additions and struckthrough for removals):
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C.8.24.2 Ultrasound Frame of Reference Module
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Table C.8.24.2-1 specifies the attributes of the Ultrasound Frame Of Reference Module. See ???.
Table C.8.24.2-1. Ultrasound Frame of Reference Module Attributes
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Attribute Name
Tag
Type
Attribute Description
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Volume Frame of
Reference UID
(0020,9312)
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Uniquely identifies this Volume Frame of Reference.
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21
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Ultrasound Acquisition
Geometry
(0020,9307)
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Characteristic of the ultrasound acquisition geometry.
Defined Terms:
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APEX
PATIENT
there exists an apex of the scan lines from which the volume data was
acquired.
the ultrasound acquisition geometry is patient relative
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Note
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When the value is PATIENT, the Plane Position (Patient) and Plane
Orientation (Patient) functional group macros will be present, and will
contain attributes with identical values to the corresponding attributes
in the Plane Position (Volume) and Plane Orientation (Volume)
functional group macros.
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Apex Position
(0020,9308)
1C
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Position of the apex (or phase center) of the acquisition geometry, encoded as xA,
yA, and zA in mm units in the Volume Frame of Reference. The apex (xA, yA, zA) may
be located in the volume or exterior to it.
Required if value of Ultrasound Acquisition Geometry (0020,9307) is APEX.
Volume to Transducer
Relationship
(0020,930B)
1C
Relationship between the transducer and the acquired volume.
Enumerated Values:
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FIXED
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Required if the transducer position and/or orientation relative to the volume is not
constant. May be present otherwise.
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The transducer position and orientation relative to the volume
is constant and specified by Volume to Transducer Mapping
Matrix (0020,9309).
POSITION_VAR
The transducer position relative to the volume varies during
acquisition and the position specified by Volume to Transducer
Mapping Matrix (0020,9309) is a nominal value. The
transducer orientation relative to the volume is constant and
specified by Volume to Transducer Mapping Matrix
(0020,9309).
ORIENTATION_VAR The transducer orientation relative to the volume varies during
acquisition and the orientation specified by Volume to
Transducer Mapping Matrix (0020,9309) is a nominal value.
The transducer position relative to the volume is constant and
specified by Volume to Transducer Mapping Matrix
(0020,9309).
VARIABLE
The transducer position and orientation relative to the volume
varies during acquisition and the position and orientation
specified by Volume to Transducer Mapping Matrix
(0020,9309) are nominal.
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CP-1475 - Add patient defined term for Ultrasound Acquisition Geometry
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Attribute Name
Tag
Type
Attribute Description
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Volume to Transducer
Mapping Matrix
(0020,9309)
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A 4x4 rigid transformation matrix that maps the Volume Frame of Reference
homogeneous coordinate system (XV, YV, ZV) to the Transducer Frame of Reference
homogeneous coordinate system (XX,YX, ZX). Matrix elements shall be listed in
row-major order. See ??? for details.
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Patient Frame of
Reference Source
(0020,930C)
1C
Indicates how the supplied Image Position (Patient) (0020,0032) and Image
Orientation (Patient) (0020,0037) values are obtained.
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Enumerated Values:
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TABLE
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Required if either Image Position (Patient) (0020,0032) or Image Orientation (Patient)
(0020,0037) is present.
A positioning device, such as a gantry, was used to generate
these values.
ESTIMATED
Estimated patient position / orientation (e.g., estimated by the
user), or if reliable information is not available.
REGISTRATION Acquisition has been spatially registered to a prior image set.
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Table Frame of
Reference UID
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Volume to Table
Mapping Matrix
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(0020,9313)
1C
Uniquely identifies this Table Frame of Reference.
Required if Patient Frame of Reference Source (0020,930C) is TABLE.
(0020,930A)
1C
A 4x4 rigid transformation matrix that maps the Volume Frame of Reference
homogeneous coordinate system (XV,YV, ZV) to the Table Frame of Reference
homogeneous coordinate system (XT,YT, ZT). Matrix elements shall be listed in
row-major order. See ??? for details.
Required if Patient Frame of Reference Source (0020,930C) is TABLE.
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