temac

90 ms·

871.
by temac 10y ago
There are improvement in modes that have been recently achieved thanks to the computing power available in CPU or GPU. For example you can now see the microvasculature with far more details than before on some systems.
872.
by temac 10y ago
Ultrasound systems is probably the cheapest modality, there is quite a lot of competition in this market, there is a lot of innovations in this market, the machine are getting cheaper and more compact, and at least in the developed world th
873.
by temac 10y ago
A car is not necessarily more complicated than an ultrasound system. Now the definition of "complicated" can be subject to debate, but you could be surprised if you compare the production prices of simple/high-end cars and si
874.
by temac 10y ago
How do you pay R&D engineers, prototypes, production, sales, support, etc... with such a low quantity volumes if the price is on the same order as the BOM? Actually, depending on your precise definition of "same order", I coul
875.
by temac 10y ago
That advice is so good that people are already working on it... even in the past! Believe it or not, there is no plot for using outdated technology and keeping the prices high. This is a quite competitive market, and engineers working in th
876.
by temac 10y ago
It depends. An FPGA able to do that is a big one, quite expensive. Today, an even more so tomorrow, you can afford to do that kind of computations in a CPU and/or a GPU. Regardless of who is doing the beamforming, the TX and RX analog
877.
by temac 10y ago
You are confusing several different thing under the vague notion of "ultrasound machines". Doppler mode is useful and cheap machines dedicated to that can and do exist. However even a basic machine able to do only a poor B-Mode ne
878.
by temac 10y ago
Hm, on the buyer side, it depends on the country but in some it is actually very competitive. So smaller players have a hard time to survive simply because of their lower volumes but similar R&D costs... Plus an ultrasound exam is not t
879.
by temac 10y ago
You can also embrace aliasing if you are kind of crazy. Look for "compressed sensing" stuff. Although I'm unsure if this would be useful for anything on ultrasound systems.
880.
by temac 10y ago
Simple and somewhat cheap ultrasound machine do exist. I'm not an expert about this market, but you can probably source some from China. R&D and will be notably inferior with less capabilities than on high end systems, and you can
881.
by temac 10y ago
You typically do short pulses in most modes. You can use some form of PWM to apodize on the edges, when needed.
882.
by temac 10y ago
You don't necessarily need the baseband (I'm not even sure if you ever need it) & depending on the mode you can tune the amount of bandwidth needed.
883.
by temac 10y ago
Also the FPGA is not sufficient. You need something with both power capabilities and a decent freq capability, to drive pulses with some decent energy. On dozen of channels.
884.
by temac 10y ago
If you want nice stuff on a probe with an analog center freq of 10MHz, you can do PWM (in various forms) with an higher freq. Now 10MHz is not be the lowest probe freq avail, it depends on the usage. Higher freq gives better resolution, b
885.
by temac 10y ago
Very old machine did some analog processing. Then it switched to digital on dedicated hardware. New machines can do all the processing in software, running on conventional hardware. There is all kind of fun stuff that you can do with ultras
886.
by temac 10y ago
That kind of figures is better than nothing but is exactly what I had in mind between toy systems and what good quality ones are able to provide. 80MHz is actually not mandatory but 40MHz starts to be really on the low end side, I think, bu
887.
by temac 10y ago
> A computer that can run a MHz frequency transducer is easy and cheap these days, e.g. a raspberry pi’s GPIO pins can run that frequency. This is ridiculous. Transmitting needs a good amount of energy for a high number of channels (seve
888.
by temac 10y ago
Why do you think there are 2 licenses? Where did you see any "cite or pay" license?
889.
by temac 10y ago
The problem is also we don't know the quality we will get with a new model... I would be more than annoyed by a laptop that has coil whine, screen flicker, and sleep issues, especially an high end laptop with that kind of price tag...
890.
by temac 10y ago
The pro is 17". They also have a 14", which weights 1.89kg.
891.
by temac 10y ago
Touchpads of Thinkpads is OK, although a little buggy (they insist in breaking your middle button being the middle click, unless you restore some registry key to historical values, but then this now unsupported function seems to degrade wit
892.
by temac 10y ago
The kettle part was a joke I guess, however USB Power Delivery already does 5A @ 20V. Now increasing either with that kind of connector would not be practical and/or safe, so I guess (the order of) 100W will be the max we will get on t
893.
by temac 10y ago
That's an "interesting" approach. Unfortunately, it is made worst by the fact MS laid off tons of testing engineers a few years ago, and now release clearly buggy versions of Windows. To add insult to the injury, it now does
894.
by temac 10y ago
Nowadays that's not an actual chip anymore, but part of another (probably the superio that handles tons of legacy pc stuff in one chip). However it nevertheless needs dedicated hardware, in the form on a trace or a wire going to a more
895.
by temac 10y ago
The first time I launched a game that played less beeppy sounds than usual on my PC without a soundcard, actually almost understandable words, I nearly had an heart attack because I knew very well this was impossible. I needed a few minutes
896.
by temac 10y ago
Well, an update is needed: the Windows testing team was huge. Now, if they remark at all a program has a problem, it will just be silently uninstalled during the next major Windows upgrade.
897.
by temac 10y ago
I'm not so sure it results in a vastly faster execution, at least on OSes which don't need half an hour to spawn a new process. So, yes, of course it was needed for Windows, because there creating a new process is so expensive tha
898.
by temac 10y ago
tmux works quite well. I'm less sure about the surface pro :p
899.
by temac 10y ago
I guess the point is the point. Potential bridges that do not exist already and probably never will do not matter -- extending that idea of potentiality I could say that you are free to reimplement the CLR in Fortran, so PowerShell is compa
900.
by temac 10y ago
It's even more than that: text formatting allows the use of generic filtering and text processing tools. Whereas if you are using objects, you will tend to use less on-the-fly command line composition, and write or reuse more tools d

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