Data from CH mode

[ep2000-del]

After acquiring the buffered data from 'CH' mode, how to understand the MLA scheme, and delay table to get beamformed data?

[clariusk]

there is no MLA when acquiring channel data, just transmission on one or more elements, then masking our beamformer to acquire a single channel, it steps across the entire probe, so 192 firings for obtain 192 channels

[ep2000-del]

If I understand the data format, the final data is of the form samples x 192, where 192 will be 192 firings or transmit events. Where and how will I get the data from active receive aperture during each transmit event?

[clariusk]

yes, each 192 channels is stored as a "frame", the active receive aperture is just one element, ie. first line is element 0

[ep2000-del]

Thanks. If I understand correctly, for each transmit event (one or more sub aperture which is controlled by txApt cast parameter), only one channel/element is used to receive. Does that mean we will have one Aline per transmit event? Hence, we will have 192 A-lines (or channel data) after the end of all transmit events which constitute as a single frame?

In the obtained .raw file from 'ch' mode, we see 'n' number of frames. These 'n' number vary sometimes from 13 to 80. How do these frames correlate with transmit events?

[clariusk]

Yes, that is correct. For frames, this is just how many 192 Channel/A-lines blocks the system generated, so in the case of 13 frames, you should be able to process 13 x 192 A-lines.

[ep2000-del]

How to acquire the pre-beamformed data for the greyscale images displayed in the mobile device (which follows MLA: 4) ?

[clariusk]

You must enter CH mode and use the secondary interleaved frame as described above