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health advisory Hospital Doctor Yu 2007-11-8 19:09:37

why we dont use electronic field for imaging of body tissues?

imagine the body between two parallel metal plane,it makes an electronic condenser and the body works

as a dielectric for this condenser,every tissue has itself dielectric constant,and these planes are formationed

by very small metal squares,so by rotating these planes around the patient,we can calculate the constant of every

tissue and find out which tissue it is,it works better than X-ray radiography and even MRI

Answers:

Interesting idea, I'm not sure if it would be much of an improvement over MRI. The physics behind MRI are very complex but in essence one is measuring the magnetic field in various tissues. MRI is more than adequate for anatomy, but the real problem is imaging things that are happening quickly (e.g. electrical activity in the brain, blood flow) while giving precise anatomical locations. If one wanted to win the Nobel prize, one would develop a device that could image real-time body functions with high resolution and be able to give exact anatomical positions.

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Well, in theory, what you describe could be used to scan a person. However, the risk of electrocution gets to be pretty high. After all, you'd need a pretty large voltage to be able to sense the effect on capacitance that a person would have. I think magnetic fields are probably safer, because you can have the magnets further away, thereby protecting the person from the electrical hazard.

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