is that possible to image heart with RF 2.45GHZ?

Question

i know people are using ultrasound but why is that? why not using RF 2.45GHZ with higher freq?

Answer 1

The wavelength of the excitation used to probe a subject gives one a relative measure of the resolution that excitation will provide. The speed of sound in water (the body) is 1496m/s making the wavelength of the common 7.5MHz ultrasound imager about 20 microns. The speed of light in water is about the same as it is in air, 300,000,000 m/s. Making the wavelength of a 2.45 GHz signal about 122 millimeters---about 600 times larger than the ultrasound wave.

So, the resolution of a 2.45GHz RF signal would have about 600 times lower resolution than the standard 7.5MHz ultrasound.

Answer 2

true, the higher the frequency, the greater the resolution, BUT also the higher the frequency the greater the attenuation! So, using 2.45ghz, at an acceptable power level, wouldn't penetrate more than a few centimeters. not to mention that (as the other person said) it would cook you! even a 7.5mhz, you may be able to image the heart, but just barely, if the person isn't fat! typically, 5mhz is used for imaging the heart, for deeper penetration.

Note: bone blocks the ultrasound signal so you have to image up through the abdomen.

Answer 3

Not to mention that this is microwave radiation and likely to cause cooking? http://flakey.info/antenna/waveguide/ see warnings