A.34.7 Basic Cardiac Electrophysiology Information Object Definition

A.34.7.1 Basic Cardiac EP IOD Description

The Basic Cardiac Electrophysiology IOD is the specification of digitized electrical signals from the patient cardiac conduction system collected in the heart, which has been acquired by an EP modality.

Note: The duration of acquisition represented in one SOP Instance is not specifically constrained, and is limited only by the maximum size of the Waveform Data attribute.

A.34.7.2 Basic Cardiac EP IOD Entity-Relationship Model

The E-R Model in Section A.34.1 of this Part applies to the Cardiac EP IOD.

A.34.7.3 Basic Cardiac EP IOD Module Table

Table A.34.7-1Basic Cardiac EP IOD Modules

IE Module Reference Usage
Patient Patient C.7.1.1 M
Clinical Trial Subject C.7.1.3 U
Study General Study C.7.2.1 M
Patient Study C.7.2.2 U
Clinical Trial Study C.7.2.3 U
Series General Series C.7.3.1 M
Clinical Trial Series C.7.3.2 U
Frame of Reference Synchronization C.7.4.2 C - Required if Waveform Originality (003A,0004) value is ORIGINAL; may be present otherwise
Equipment General Equipment C.7.5.1 M
Waveform Waveform Identification C.10.8 M
Waveform C.10.9 M
Acquisition Context C.7.6.14 M
Waveform Annotation C.10.10 C - required if annotation is present
SOP Common C.12.1 M

A.34.7.4 Basic Cardiac EP IOD Content Constraints

A.34.7.4.1 Modality

The value of Modality (0008,0060) shall be EPS.

A.34.7.4.2 Acquisition Context Module

The Defined Template for Acquisition Context Sequence (0040,0555) is TID 3450.

A.34.7.4.3 Waveform Sequence

The number of Waveform Sequence (5400,0100) Items shall be between 1 and 4, inclusive.

A.34.7.4.4 Sampling Frequency

The value of the Sampling Frequency (003A,001A) in each Waveform Sequence Item shall be less than or equal to 20000.

A.34.7.4.5 Channel Source

The Defined Context ID for the Channel Source Sequence (003A,0208) in each Channel Definition Sequence Item shall be CID 3011. The Channel Source Code Value shall encode at minimum the anatomic location of the channel source.

The Channel Source Modifiers Sequence (003A,0209) in each Channel Definition Sequence Item shall be used to specify additional qualifiers of the semantics of the waveform source, including metric (measured physical quality), function (measurement or stimulus), and technique from Defined Context ID 3240, and anatomic location qualifiers from Defined Context ID 3019, if not encoded by the Channel Source Code Value. If not explicitly encoded, the default metric and function shall be “voltage measurement”. If a differential signal is used, that shall be indicated in a Modifier Item, and the positive pole and negative pole identified in the subsequent two modifiers.

Notes: 1. Terms from other Context Groups may also be used for extended specification of the Channel Source, as declared in the Conformance Statement for an application (see PS3.2).

2. A differential signal from the high right atrium , where electrode 1 on the catheter is the positive pole and electrode 3 the negative pole, could be specified by coded terms meaning: Channel Source: “High Right Atrium” Channel Source Modifiers: “Differential”, “E1”, “E3” (Implicit default modifier: “Voltage Measurement”)

A.34.7.4.6 Waveform Sample Interpretation

The value of the Waveform Sample Interpretation (5400,1006) in each Waveform Sequence Item shall be SS.

A.34.7.4.7 Waveform Annotation Module

The Defined Context ID for the Concept Name Code Sequence (0040,A043) in the Waveform Annotation Sequence (0040,B020) shall be CID 3339.