Q.7 MRI machine uses magnetic field to create detailed images of human soft organs. Can you elaborate...

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Physics

Q.7 MRI machine uses magnetic field to create detailedimages of human soft organs. Can you
elaborate the basic concept of working of MRI scanner? How thestrong magnetic field is
produced in MRI scanner to scan the organs? Discuss the role ofradio waves in MRI machines?
Write down major parts used in MRI machine. What would happen ifthe north-pole end of a bar
magnet is held near a positively charged piece of plastic? Justifyyour answer. X-ray machine
and MRI machine do the same job of human organ scanning. Analyzeboth the machines and
discuss three merits and demerits of it.

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a The basic concept of working of MRI scanner Magnetic resonance imaging MRI uses the bodys natural magnetic properties to produce detailed images from any part of the body It is often used for disease detection diagnosis and treatment monitoring It is based on sophisticated technology that excites and detects the change in the direction of the rotational axis of protons found in the water that makes up living tissues MRIs employ powerful magnets which produce a strong magnetic field that forces protons in the body to align with that field When a radiofrequency current is then pulsed through the patient the protons are stimulated and spin out of equilibrium straining against the pull of the magnetic field When the radiofrequency field is turned off the MRI sensors are able to detect the energy released as the protons realign with the magnetic field The time it takes for the protons to realign with the magnetic field as well as the amount of energy released changes depending on the environment and the chemical nature of the molecules Physicians are able to tell the difference between various types of tissues based on these magnetic properties To obtain an MRI image a patient is placed inside a large magnet and See Answer

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