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Insana Lab: Ultrasonic Imaging - The University of Illinois at Urbana-Champaign

Insana Lab: Ultrasound Research Interface (URI)


Q: What are the dimensions of the data acquired with a linear array in B-mode?
A: With no steering, the data acquired with a linear array should represent a rectangular region.
The current URI file header does not contain direct information on the raw RF's dimensions, but you can calculate them by using speed of sound, the 40MHz sampling rate, and other info.
    Axial size (cm): 154000/2/40e6*size(BmodeArray,1)
    Lateral size (cm): size(BmodeArray,2)/FileHeader.rfbm.LineDensity
While FileHeader.rfbm contains many information on image dimensions, most of them pertain only to the image displayed on the Antares screen, which may be different from the actual acquired RF data. FileHeader.rfbd.PositionX and FileHeader.rfbdf.PositionZ also contain geometry about each vector's beam origin.

Q: What's the RF data sampling rate?
A: The URI's digital RF data are all sampled at 40MHz, independent of what mode they are acquired in.

Q: Why can't I connect to Antares from another computer through http://****/service , where **** is the name (or IP name) of my Antares?
A: You can connect to Antares by using http://####/service, where #### is the IP address (example: instead of the name of Antares. If you don't know the IP address of your Antares, please type ping **** in your computer's command prompt, where **** is the name of your Antares.

Q: Why is there a lateral offset in frames of data acquired using a macro first or macro list?
A: This is a known deficiency in the software. Siemens is aware of this, and is working to fix the problem. Data files acquired with a macro first or macro list will result in some of the RF data frames being partially acquired. This is observed as a lateral offset when the frames are displayed assuming they were fully acquired. Files that are "manually" acquired (that is, acquired by manually pushing the "Acq. RF" button) will not have this problem.

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