| 14 Dec 2019 |
| 16:28:28 | |  jannis joined the room. |
| 19:16:52 | |  backtu joined the room. |
| 15 Dec 2019 |
| 06:02:07 |  fadhliazinnuddin | 5M5PLH9S can i buy un0rick board use paypal |
| 09:53:53 |  kelu | Sure ! It's out of stock at the moment but a new batch is ready early January. |
| 09:54:46 | kelu | It is on the tindie store at https://www.tindie.com/products/kelu124/un0rick-open-ice40-ultrasound-imaging-dev-board/ |
| 13:26:43 | fadhliazinnuddin | 5M5PLH9S out of stock |
| 14:11:20 | kelu | Yes I know, new batch due in early January. |
| 20:18:38 | |  jean joined the room. |
| 20:49:52 | |  alfred joined the room. |
| 24 Dec 2019 |
| 17:56:05 | kelu | And a merry Xmas season to all :) 🎆 🎇 🎄 🎇 🎉 🎊 🎁 🎉 |
| 25 Dec 2019 |
| 14:06:08 |  toad_polo | kelu: 🎄 😄 |
| 26 Dec 2019 |
| 13:09:46 | |  jason joined the room. |
| 13:42:44 | |  magdalena joined the room. |
| 15:50:28 | |  marian joined the room. |
| 30 Dec 2019 |
| 20:47:27 | kelu | 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 |
| 23:59:32 | |  pedran joined the room. |
| 5 Jan 2020 |
| 01:48:30 | |  jacques joined the room. |
| 6 Jan 2020 |
| 23:09:37 | |  sven joined the room. |
| 12 Jan 2020 |
| 18:20:15 | |  schillna joined the room. |
| 18:20:16 | schillna | 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 | kelu | 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 | schillna | 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 |  wlmeng11 | 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 | schillna | 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 | kelu | 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 | kelu | But that means you can only shoot from one element, and listen on one element |
| 08:20:41 | kelu | 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 | schillna | 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 | kelu | Welcome @bamada |
| 18 Jan 2020 |
| 11:20:40 | kelu | hey, E3JX8LUT & others, restock has taken place for un0rick's boards if needed. |
