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>Making a photo sensor must be thousands of times more complicated than ultrasounds sensors. Cheaper thermal imaging sensors like that usually use a very, very

>Making a photo sensor must be thousands of times more complicated than ultrasounds sensors. Cheaper thermal imaging sensors like that usually use a very, very low resolution sensor for picking up thermal data, then use interpolation to map the low-resolution data onto a high-resolution image provided by a higher-res conventional camera sensor. Obviously, this approach won't work with ultrasound tech, as there wouldn't be a secondary high-resolution data source.

grahar64 11y ago
In the post there is a link to a paper where someone used a 40x40 array for 3d ultrasound imaging and there is a 64x array at 35MHz used for high resolution imaging of things like eyes. That is pretty low resolution for such interesting applications. Imagine the applications for a high resolution 3D ultrasound scanner combined with a high-resolution camera.
- gene-h 11y ago
  It might be helpful to elaborate on what applications a 3d ultrasound scanner would have.
- conceit 11y ago
  A 40x40 ultrasound array can scan with a much better resolution, look at prenatal imaging for example. The phased array is modulated in the time and space domains, so one cell can substitute many fixed ones. With the speed of sound, the receivers resolution of depth information extracted from a reflection's timing information would be a million times better. ...
  - conceit 11y ago
    I'm not sure I would understand my own description, let me go again: The transducer sends a modulated signal and receives the reflections. From the time difference information is gained. The signal is steered using beamforming as known from radar technology. This creates many different impulses that can be correlated from the received reflections. The key is that the 1600 sells deliver more than one input over time, from a nonstatic signal, which is like shooting photos from different perspectives. I believe cell correlation or whatchamacallit is done in all kinds of variation for CCD data, too.

grahar64 11y ago

In the post there is a link to a paper where someone used a 40x40 array for 3d ultrasound imaging and there is a 64x array at 35MHz used for high resolution imaging of things like eyes. That is pretty low resolution for such interesting applications. Imagine the applications for a high resolution 3D ultrasound scanner combined with a high-resolution camera.

gene-h 11y ago
It might be helpful to elaborate on what applications a 3d ultrasound scanner would have.
conceit 11y ago
A 40x40 ultrasound array can scan with a much better resolution, look at prenatal imaging for example. The phased array is modulated in the time and space domains, so one cell can substitute many fixed ones. With the speed of sound, the receivers resolution of depth information extracted from a reflection's timing information would be a million times better. ...
- conceit 11y ago
  I'm not sure I would understand my own description, let me go again: The transducer sends a modulated signal and receives the reflections. From the time difference information is gained. The signal is steered using beamforming as known from radar technology. This creates many different impulses that can be correlated from the received reflections. The key is that the 1600 sells deliver more than one input over time, from a nonstatic signal, which is like shooting photos from different perspectives. I believe cell correlation or whatchamacallit is done in all kinds of variation for CCD data, too.