FFF.2.1.2.1.4 Example

In this example, there are two modalities that are synchronized with an external clock via NTP. The Image Modality acquires three multi-frame images within the same Study and same Series. Simultaneously, the Waveform Modality acquires the ECG non-stop during the same period, leading to one single Waveform SOP Instance on a different Study.

In this example, there is no UID referencing capability between the two modalities.

[pic]

Figure FFF.2.1-7Example of Multi-modality Waveform Synchronization

The attributes that define the relevant content in the two different SOP Instances (Enhanced XA and General ECG) are described in the following figure:

ENHANCED XA SOP INSTANCES

Study Instance UID (0020,000D) = UID “A”
Series Instance UID (0020,000E) = UID “B”
Modality (0008,0060) = XA
Synchronization Frame of Reference UID (0020,0200) = 1.2.840.10008.15.1.1
Synchronization Trigger (0018,106A) = NO TRIGGER
Acquisition Time Synchronized (0018,1800) = Y
Time Source (0018,1801) = Clock System ID
Time Distribution Protocol (0018,1802) = NTP
NTP Source Address (0018,1803) = aaa.bbb.ccc.ddd
SOP Instance UID (0008,0018) = UID “D1”, “D2” and “D3” resp.

GENERAL ECG SOP INSTANCE

Study Instance UID (0020,000D) = UID “E”
Series Instance UID (0020,000E) = UID “F”
Modality (0008,0060) = ECG
Synchronization Frame of Reference UID (0020,0200) = 1.2.840.10008.15.1.1
Synchronization Trigger (0018,106A) = NO TRIGGER
Acquisition Time Synchronized (0018,1800) = Y
Time Source (0018,1801) = Clock System ID
Time Distribution Protocol (0018,1802) = NTP
NTP Source Address (0018,1803) = aaa.bbb.ccc.ddd
SOP Instance UID (0008,0018) = UID “H”

Figure FFF.2.1-8Attributes of Multi-modality Waveform NTP Synchronization