MRI- How it works.?

Question

I need to find ou t about a medical technooy called magnetic resonance imaging or MRI. I know that using MRI doctors can study three-dimensional images of a atient's internal organs. So help me find out how MRI works.
P.S. It has to be in a report kind of form.
thank youuuu -Min

Answer 1

I am an MRI Tech and it is not a simple thing to explain. It is very difficult and takes a long time to understand. In a nut shell... The scanner is a giant magnet. We place the the body part that needs to be scanned into a coil. This coil lets us send RF pulses to it which re-arranges the cells and the cell structures in that particular body part. This gives off a signal. The Magnet picks up this signal and converts the data into an image.

Answer 2

In a nutshell, as simply put as MRI can be explained:

MRI (Magnetic Resonance Imaging) uses a super powerful magnet, a radio transmitter, a snazzy antenna (or coil) and a complicated computer system to generate images of human anatomy.

Your body is largely made up of water, which in turn is mostly Hydrogen. Hydrogen atoms have particular magnetic properties that are exploited by the MRI to create an image.

Your atoms aren't just sitting ducks. They're constantly spinning and wobbling (precessing). Your hyrdrogen atoms wobble (or precess) at a predictable and controllable frequency. The strength of the magnetic field surrounding your body controls the wobbling speed (precessional frequency). The RF transmitter in the scanner excites your hydrogen atoms by emitting an RF frequency the same as the wobbling frequency of your hyrdogen atoms. These frequencies are measured in megahertz. The RF transmitter turns on and off hundreds of times per second. Every time it turns off, your hydrogen atoms lose their "exitement" (or energy they got from the RF signal). This energy is released in the form of RF which is detected by the snazzy antenna (or coil) in the scanner and translated into images by the computer system.

So... In summary, the magnet controls the precessional frequency of the hydrogen atoms. The RF transmitter excites the hydrogen atoms. When the RF transmitter shuts off every few milliseconds, the hydrogen atoms relax back to their normal state, giving off their absorbed energy in the form of RF, which is measured by the snazzy antenna called the coil. The antenna reports the signal to the computer system which creates images based on the amplitude of the signal received.

Whew. Hope that helps.

Answer 3

Put MRI into Google or Wikipedia... you'll get several pages of sites with info.
ie: Do your own homework!

Answer 4

Try this