Plus applications user manual  2.7.0.7ac5b43
Software library for tracked ultrasound image acquisition, calibration, and processing.
Virtual Capture

This device allows writing acquired data to disk. Data can be recorded in memory and written to disk (for short, high-throughput acquisitions) or directly written to disk (for continuous acquisition of large amount of data, requires fast disk access for high-throughput acquisition).

The file is saved as FileSequenceMetafile format. If single file output format is used (file extension is ) then stopping of the recording may take some time (as temporary recording output has to be merged into one file). If multiple long sequences have to be recorded then use the header+data file format (.mhd extension of the filename): in this case a the capture device can start a new acquisition immediately after stopping the previous recording.

Device configuration settings

Example configuration file PlusDeviceSet_Server_Sim_NwirePhantom.xml

<PlusConfiguration version="2.1">
<DataCollection StartupDelaySec="1.0" >
<DeviceSet
Name="PlusServer: Replay fCal phantom scan with Ultrasonix US (L14-5 probe) + Ascension3DG tracker (Probe, Reference, Stylus)"
Description="Free-hand probe motion, imaging 3 NWires, after spatial calibration. OpenIGTLink broadcasting through PlusServer of image and tool tracking data." />
<Device
Id="TrackedVideoDevice"
Type="SavedDataSource"
SequenceFile="fCal_Test_Calibration_3NWires.igs.mha"
UseData="IMAGE_AND_TRANSFORM"
UseOriginalTimestamps="TRUE"
RepeatEnabled="TRUE" >
<DataSources>
<DataSource Type="Video" Id="Video" />
</DataSources>
<OutputChannels>
<OutputChannel Id="TrackedVideoStream" VideoDataSourceId="Video" />
</OutputChannels>
</Device>
<Device
Id="CaptureDevice"
Type="VirtualCapture"
BaseFilename="RecordingTest.igs.mha"
EnableCapturingOnStart="FALSE" >
<InputChannels>
<InputChannel Id="TrackedVideoStream" />
</InputChannels>
</Device>
<Device
Id="VolumeReconstructorDevice"
Type="VirtualVolumeReconstructor"
OutputVolDeviceName="RecVol_Reference">
<InputChannels>
<InputChannel Id="TrackedVideoStream" />
</InputChannels>
<VolumeReconstruction
ImageCoordinateFrame="Image" ReferenceCoordinateFrame="Reference"
Interpolation="LINEAR" Optimization="NONE" CompoundingMode="MEAN" FillHoles="OFF" NumberOfThreads="2"
ClipRectangleOrigin="0 0" ClipRectangleSize="820 616"
OutputOrigin="-15 -15 30" OutputExtent="0 300 0 300 0 300" OutputSpacing="0.15 0.15 0.15" />
</Device>
</DataCollection>
<PlusOpenIGTLinkServer
MaxNumberOfIgtlMessagesToSend="1"
MaxTimeSpentWithProcessingMs="50"
ListeningPort="18944"
SendValidTransformsOnly="true"
OutputChannelId="TrackedVideoStream" >
<DefaultClientInfo>
<MessageTypes>
<Message Type="IMAGE" />
<Message Type="TRANSFORM" />
</MessageTypes>
<TransformNames>
<Transform Name="ProbeToTracker" />
<Transform Name="ReferenceToTracker" />
<Transform Name="ProbeToReference" />
</TransformNames>
<ImageNames>
<Image Name="Image" EmbeddedTransformToFrame="Reference" />
</ImageNames>
</DefaultClientInfo>
</PlusOpenIGTLinkServer>
<CoordinateDefinitions>
<Transform From="Image" To="TransducerOriginPixel"
Matrix="
1 0 0 -410
0 1 0 5
0 0 1 0
0 0 0 1"
Date="2011.12.06 17:57:00" />
<Transform From="Phantom" To="Reference"
Matrix="
0.00898765 -0.0136951 -0.999866 9.59137
0.0246163 -0.9996 0.0139127 36.0012
-0.999657 -0.024738 -0.00864693 87.8909
0 0 0 1"
Error="0.404711" Date="012712_152104" />
<Transform From="StylusTip" To="Stylus"
Matrix="
1 0 0 203.772
0 1 0 -12.283
0 0 1 1.17469
0 0 0 1"
Error="0.582721" Date="012712_152030" />
<Transform From="Image" To="Probe"
Matrix="
0 0.08 0 11
-0.08 0 0 50
0 0 0.08 0
0 0 0 1"
Error="0.582721" Date="012712_152030" />
</CoordinateDefinitions>
</PlusConfiguration>