Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [ultrasound]

The tag has no usage guidance.

0
votes
0answers
9 views

Ultrasound Imaging - Reading an M-mode image

This is an M-mode ultrasound image of a carotid we took in lab-class. I know from my lab manual that M-mode reveals changes in the positions of structures along a particular A-scan line as a ...
1
vote
0answers
24 views

Non-cavitating ultrasound for denaturation of short strands of DNA (~20 bp)?

I know that there is existing research on ultrasound-induced transient cavitation bubbles that mechanically denature DNA by generating violent shock waves locally in solution. I would like to know ...
6
votes
3answers
1k views

Why don't we hear ultrasonic sounds as aliased versions of the original signals?

The upper limit of hearing is approximately 15 kHz, dependent on age and other factors. According to the principles of digital signal-processing, such an upper limit would mean that the auditory ...
1
vote
0answers
13 views

Acoustic characteristics of thoracic diaphragm

I am looking for any kind of information about the acoustic characteristics of the thoracic diaphragm. In particular, I'm looking for characteristics which will allow to differentiate it from other ...
34
votes
1answer
686 views

Does this recording sound like the pulses emitted by bats?

Out of curiosity, I recorded sounds in an area with lots of bats, hoping to be able to "hear" the bats communicating by lowering the ultrasound to a level down to the frequency which can be heard by a ...
35
votes
3answers
31k views

Can humans perceive sounds above 20 kHz?

In the never-ending debate raging in the audiophile community about sound quality and what humans can or cannot hear, it is very very very very incredibly often cited that the upper-limit of the ...
9
votes
3answers
890 views

Are there echolocating insects?

Echolocation is the ability to obtain spatial information of the surroundings from echos generated by the animal. There are bats and other vertebrates that naturally use it. I was wondering if this ...
1
vote
1answer
124 views

Are there any bacteria that can receive ultrasound signals?

I'm looking for an example of bacteria that could receive ultrasound (at any ultrasound frequency) signal and possibly perform some (re)action afterwards.
2
votes
2answers
60 views

Can stress echocardiography show coronary blood flow difference before and after exercise?

Stress echocardiography means a pair of cardiac ultrasound imaging examinations, before and after exercise. I assume that coronary blood flow is increased after exercise. Is cardiac ultrasound ...
4
votes
1answer
103 views

Can frequent ultrasound diagnostics be harmful?

Are there any short or long term effects apparent in tissues if a zone (or the whole) of human body is scanned with ultrasonic waves often?