CP-1857Factor out algorithm identification common to multiple observations
Status
Final Text
Date of Last Update
2019/05/24
Person Assigned
David Clunie
Submitter Name
QICR
Submission Date
2018/10/12
Correction Number CP-1857
Log Summary: Factor out algorithm identification common to multiple observations
Name of StandardPS3.16 2019b
Rationale for Correction:TID 1500 includes the algorithm identification macro at the individual observation level but the same information may be common to many observations and it should be possible to encode it as device context at a higher level in the content tree, either at the Measurement Group level, or for all Imaging Measurements.The identification of the algorithm is distinct from the entire device that is specified in observer context or the General Equipment module.Also, extend the algorithm identification information with coded equivalents of text values for consistency with the similar macro in PS3.3 used in non-SR objects.
Correction Wording:
Amend DICOM PS3.16 as follows (changes to existing text are bold and underlined for additions and struckthrough for removals):
Device Observer Identifying AttributesThis Template (derived from the DICOM General Equipment Module of PS3.3) contains identifying (and optionally descriptive) attributes of devices that are observers.Type:ExtensibleOrder:SignificantRoot:No
Device Observer Identifying Attributes
NL
Rel with Parent
VT
Concept Name
VM
Req Type
Condition
Value Set Constraint
1
UIDREF
EV (121012, DCM, "Device Observer UID")
1
M
2
TEXT
EV (121013, DCM, "Device Observer Name")
1
U
Defaults to value of Station Name (0008,1010) in General Equipment Module
3
TEXT
EV (121014, DCM, "Device Observer Manufacturer")
1
U
Defaults to value of Manufacturer (0008,0070) in General Equipment Module
4
TEXT
EV (121015, DCM, "Device Observer Model Name")
1
U
Defaults to value of Manufacturer's Model Name (0008,1090) in General Equipment Module
5
TEXT
EV (121016, DCM, "Device Observer Serial Number")
1
U
Defaults to value of Device Serial Number (0018,1000) in General Equipment Module
6
TEXT
EV (121017, DCM, "Device Observer Physical Location During Observation")
1
U
7
CODE
EV (113876, DCM, "Device Role in Procedure")
1-n
U
...
8
TEXT
EV (110119, DCM, "Station AE Title")
1
U
Content Item Descriptions
Planar ROI Measurements...Type:ExtensibleOrder:Non-SignificantRoot:No
Planar ROI Measurements
NL
Rel with Parent
VT
Concept Name
VM
Req Type
Condition
Value Set Constraint
1
CONTAINER
EV (125007, DCM, "Measurement Group")
1
M
...
11
>
CONTAINS
INCLUDE
D
1
M
...
12
>
CONTAINS
CODE
$QualitativeEvaluations
1-n
U
13
>
CONTAINS
TEXT
$QualitativeEvaluations
1-n
U
Content Item Descriptions
...
...
Volumetric ROI Measurements...Type:ExtensibleOrder:Non-SignificantRoot:No
Volumetric ROI Measurements
NL
Rel with Parent
VT
Concept Name
VM
Req Type
Condition
Value Set Constraint
1
CONTAINER
EV (125007, DCM, "Measurement Group")
1
M
...
15
>
CONTAINS
INCLUDE
D
1
M
...
16
>
CONTAINS
CODE
$QualitativeEvaluations
1-n
U
17
>
CONTAINS
TEXT
$QualitativeEvaluations
1-n
U
Content Item Descriptions
ROI Measurements...Type:ExtensibleOrder:Non-SignificantRoot:No
ROI Measurements
NL
Rel with Parent
VT
Concept Name
VM
Req Type
Condition
Value Set Constraint
1
HAS CONCEPT MOD
CODE
EV (G-C036, SRT, "Measurement Method")
1
U
$Method
...
4
>
HAS CONCEPT MOD
CODE
DT (G-A1F8, SRT, "Topographical modifier")
1
U
$TargetSiteMod
4b
HAS CONCEPT MOD
INCLUDE
D
1
U
5
NUM
$Measurement
1-n
M
UNITS = $Units
...
7
>
HAS CONCEPT MOD
CODE
EV (G-C036, SRT, "Measurement Method")
1
U
$Method
...
20
>
HAS CONCEPT MOD
INCLUDE
D
1
U
Content Item Descriptions
...
Row 4b
Describes the algorithm that applies to all measurements in Row 5, unless overridden within the individual measurement at Row 20.
Measurements Derived From Multiple ROI Measurements...Type:ExtensibleOrder:Non-SignificantRoot:No
Measurements Derived From Multiple ROI Measurements
NL
Rel with Parent
VT
Concept Name
VM
Req Type
Condition
Value Set Constraint
1
NUM
DCID 7465 "Measurements Derived From Multiple ROI Measurements"
1-n
M
1b
>
HAS CONCEPT MOD
INCLUDE
D
1
U
2
>
R-INFERRED FROM
INCLUDE
D
1-n
MC
XOR Row 3
...
3
>
R-INFERRED FROM
INCLUDE
D
1-n
MC
XOR Row 2
...
4
>
HAS PROPERTIES
INCLUDE
DTID 320 "Image or Spatial Coordinates"
1
U
......
Content Item Descriptions
Row 1
Specifies the type of derived measurement reported, e.g., the mean of the individual ROI mean density values. Note that the units may be different from the units in the ROI measurements
Row 1b
Describes the algorithm used to produced the derived measurement, as opposed to the referenced measurements from which this measurement was derived.
Rows 2, 3
The measurement values of each ROI that contributes to the derived measurement, e.g., the mean density within an ROI. These are specified by reference, so as to not have to repeat the ROI information when it contributes to multiple derived measurements (e.g., if both mean and SD of ROI mean density values were specified).
The conditions require that at least one of the "heading" containers be present, though any of them may be present but empty.
Row 6b, 10b, 12b
Describes the algorithm that applies to all observations within the container, unless overridden at the group or individual observation level.
Rows 7, 8, 9
The baseline context groups defined allow for generic intensity, size and texture measurements, regardless of the geometry of the ROI (e.g., linear distance can be measured on volumes, or volume can be estimated from a linear distance), and being baseline, do not constrain the invoker from using other appropriate concepts specific to the application.
Row 9
A Measurement Group is used to contain one or more individual measurements that are invocations of TID 300, consistent with TIDs 1410 and 1411, which both already have Measurement Group containers as their roots.
Rows 12, 13, 14
These Content Items allow encoding a flat list of name-value pairs that are coded questions with coded or text answers, for example, to record categorical observations related to the entire subject of the report rather than specific measurement groups.
EV (126100, DCM, "Real World Value Map used for measurement")
1
U
SOP Class UID shall be Real World Value Mapping Storage ("1.2.840.10008.5.1.4.1.1.67")
9b
HAS CONCEPT MOD
INCLUDE
D
1
U
10
>
CONTAINS
INCLUDE
D
1-n
M
...
11
>
CONTAINS
CODE
$QualitativeEvaluations
1-n
U
12
>
CONTAINS
TEXT
$QualitativeEvaluations
1-n
U
Content Item Descriptions
Row 9b
Describes the algorithm that applies to all measurements in TID 300 Row 1, unless overridden within the individual measurement at TID 300 Row 19.
Algorithm IdentificationThis Template details the algorithm unambiguously. Re-state the software identification from the General Equipment Module of the SR IOD if all algorithms are unambiguously defined by that module.Type:Non-ExtensibleOrder:SignificantRoot:No
Algorithm Identification
NL
Rel with Parent
VT
Concept Name
VM
Req Type
Condition
Value Set Constraint
1
TEXT
EV (111001, DCM, "Algorithm Name")
1
M
1b
CODE
EV (111001, DCM, "Algorithm Name")
1
U
2
TEXT
EV (111003, DCM, "Algorithm Version")
1
M
3
TEXT
EV (111002, DCM, "Algorithm Parameters")
1-n
U
4
CODE
EV (111000, DCM, "Algorithm Family")
1
U
Content Item Descriptions
Row 1
May be the same as the Manufacturer's Model Name (0008,1090) in General Equipment Module, if the Algorithm is not distinguishable from the body of software that makes up the Equipment.
Row 2
May be the same as Software Versions (0018,1020) in General Equipment Module, if the latter is a single Value, or its multiple Values are combined into a single TEXT Content Item Value.
The family of algorithm(s) that best describes the software algorithm used.
111001
Algorithm Name
The name assigned by a manufacturer to a specific software algorithm.
111002
Algorithm Parameters
The input parameters used by a manufacturer to configure the behavior of a specific software algorithm.
111003
Algorithm Version
The software version identifier assigned by a manufacturer to a specific software algorithm.
DICOM PS3.3 for reference unchanged:
Algorithm Identification Macro describes the Attributes for encoding the algorithm used to create or derive a SOP Instance contents. An algorithm is described by the Algorithm Family, a specific Algorithm Name, and an Algorithm Version. A character string containing parameters that were used in the algorithm can be included.
Algorithm Identification Macro Attributes
Attribute Name
Tag
Type
Attribute Description
Algorithm Family Code Sequence
(0066,002F)
1
The family of algorithm(s) that best describes the software algorithm used.Only a single Item shall be included in this Sequence.
The name assigned by a manufacturer to a specific software algorithm.
Algorithm Version
(0066,0031)
1
The software version identifier assigned by a manufacturer to a specific software algorithm.
Algorithm Parameters
(0066,0032)
3
The input parameters used by a manufacturer to configure the behavior of a specific software algorithm.
Algorithm Source
(0024,0202)
3
Source of the algorithm, e.g., the name of the manufacturer, researcher, university, etc.
General Equipment Module specifies the Attributes that identify and describe the piece of equipment that produced a Series of Composite Instances.
General Equipment Module Attributes
Attribute Name
Tag
Type
Attribute Description
Manufacturer
(0008,0070)
2
Manufacturer of the equipment that produced the Composite Instances.
Institution Name
(0008,0080)
3
Institution where the equipment that produced the Composite Instances is located.
Institution Address
(0008,0081)
3
Mailing address of the institution where the equipment that produced the Composite Instances is located.
Station Name
(0008,1010)
3
User defined name identifying the machine that produced the Composite Instances.
Institutional Department Name
(0008,1040)
3
Department in the institution where the equipment that produced the Composite Instances is located.
Manufacturer's Model Name
(0008,1090)
3
Manufacturer's model name of the equipment that produced the Composite Instances.
Device Serial Number
(0018,1000)
3
Manufacturer's serial number of the equipment that produced the Composite Instances.This identifier corresponds to the device that actually created the images, such as a CR plate reader or a CT console, and may not be sufficient to identify all of the equipment in the imaging chain, such as the generator or gantry or plate.
Software Versions
(0018,1020)
3
Manufacturer's designation of software version of the equipment that produced the Composite Instances. See .
...
...
...
...
General Equipment Attribute DescriptionsThe Attributes Manufacturer (0008,0070), Manufacturer's Model Name (0008,1090) and Device Serial Number (0018,1000) are intended to be a primary identification of the system that produces the data (e.g., modality or workstation application providing the content of the SOP Instance) and not the identification of the component that encodes the SOP Instance (e.g., a commonly used DICOM encoding toolkit).Software VersionsSoftware Versions (0018,1020) is a multi-valued Attribute. For equipment that is composed of several components, it may be used to identify the name and version for each of those components. This may also include the identifier and version of libraries or configuration files that significantly affect the production of the SOP Instance.