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Chat room for [ultrasound imaging dev kit](https://hackaday.io/project/10899-a-hsdk-for-ultrasound-imaging).12 Servers

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Timestamp Message
14 Dec 2019
16:28:28@jannis:asra.grjannis joined the room.
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15 Dec 2019
06:02:07@_slack_usdevkit_UE3JX8LUT:matrix.orgfadhliazinnuddin 5M5PLH9S can i buy un0rick board use paypal
09:53:53@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Sure ! It's out of stock at the moment but a new batch is ready early January.
09:54:46@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu It is on the tindie store at https://www.tindie.com/products/kelu124/un0rick-open-ice40-ultrasound-imaging-dev-board/
13:26:43@_slack_usdevkit_UE3JX8LUT:matrix.orgfadhliazinnuddin 5M5PLH9S out of stock
14:11:20@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Yes I know, new batch due in early January.
20:18:38@jean:matrix.allmende.iojean joined the room.
20:49:52@alfred:matrix.kiwifarms.netalfred joined the room.
24 Dec 2019
17:56:05@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu And a merry Xmas season to all :) 🎆 🎇 🎄 🎇 🎉 🎊 🎁 🎉
25 Dec 2019
14:06:08@bilge_emulsion:matrix.orgtoad_polo kelu: 🎄 😄
26 Dec 2019
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30 Dec 2019
20:47:27@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Last fun of the year - getting to know the piezos inside probes better with an antenna analyser : https://github.com/kelu124/echomods/tree/master/include/images/probes_vna 😃
2 Jan 2020
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5 Jan 2020
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6 Jan 2020
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12 Jan 2020
18:20:15@_slack_usdevkit_USJK5K11S:matrix.orgschillna joined the room.
18:20:16@_slack_usdevkit_USJK5K11S:matrix.orgschillna Hi, I cam accross this slack channel via http://un0rick.cc/, please let me know if this is the right place to ask the following questions or not 🙂 I'm interested in building an ultrasound imaging setup for fun, and as I come from an applied mathematics background I am in particular interested in setups using more nonstandard reconstruction algorithms. Most of the DIY setups I've seen do B-mode echography, in which the actual reconstruction is a 1D problem on each line - the final image is obtained by gluing these lines together. I feel like it should be possible to get better images by incorporating multiple (e.g. 3 or 4) transducers/receivers to exploit the fact that echoes spread out. Has anyone here done something like this, or can point me in the right direction as to why this is a bad idea?
18:55:34@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Welcome, SJK5K11S, yes, that's a good place 😃 I guess you have to check the maths behinds the beamforming on transducers arrays, but i guess you question is more building a setup with a few piezos 😃
21:02:36@_slack_usdevkit_USJK5K11S:matrix.orgschillna thanks! 🙂 Maybe to clarify, I'm interestied in the following three somewhatrelated questions a) whether or not anyone has done work in the DIY field with multiple piezos (without the costs scaling linearly), and b) whether or not anyone in the DIY field has done anything other than B-mode echography, and c) whether anyone knows of (academic) work in trying to do fully 3-D reconstruction without a "full" sensor array (I'm thinking something like photoacoustic imaging, but with the ultrasound "source" being a localized echo of some type). It's a shame that there aren't cheap ultrasound sensor-arrays the way there are cheap high-resolution light sensor arrays in any camera....
22:30:09@_slack_usdevkit_U8Z3VB1T2:matrix.orgwlmeng11 a) Not that I know of. Adding more piezo channels means adding more channels for wiring, amplifier, ADC, and so on. In academia and industry, this linearly increasing cost can be avoided with monolithic CMUT chips, but that is out of reach for hobbyists due to high fixed cost. b) Theoretically, existing DIY hardware (eg. kelu's un0rick or my project rtl-ultrasound) should be compatible with Doppler mode, it's just a matter of signal processing. c) 3D ultrasound can be done with a single piezo element by using compressed sensing, as in https://advances.sciencemag.org/content/3/12/e1701423
23:29:15@_slack_usdevkit_USJK5K11S:matrix.orgschillna 8Z3VB1T2 thanks! as far as I can tell so far, point (c) in particular is exactly the kind of thing I was looking far
13 Jan 2020
08:17:59@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu For a) I would add that you could add switches or muxes, with which you can add channels a lower cost. I've started on a max14866 design for 8 elements independant tx/rx
08:18:33@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu But that means you can only shoot from one element, and listen on one element
08:20:41@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu For compressed sensing, yeah that's the thing for single element designs ! But one needs a reliable manufacturer or process to do the right mask. Also a point of interest for many of us here :)
08:38:07@_slack_usdevkit_USJK5K11S:matrix.orgschillna I still haven't looked at the compressed sensing paper in detail, but it seems like they must be doing one of two things (a) exploiting some kind of nonlinearity caused by the aperture or (b) only be able to reconstruct sparse images -- if it is (a), then I think this approach has potential, if (b) then I wouldn't expect this to be useful in most applications
16 Jan 2020
11:12:52@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Welcome @bamada
18 Jan 2020
11:20:40@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu hey, E3JX8LUT & others, restock has taken place for un0rick's boards if needed.

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