MRI

The video explains the workings of MRI machines, which use strong magnetic fields and radio waves to create images of the human body. It details the role of different magnets and coils in the MRI system, focusing on how hydrogen atoms in the body align with the magnetic field and emit photons when returning to their natural state. These photons are captured to form images. Unlike X-rays, MRI is safe if no metal is present.

What is the primary function of the largest magnet in an MRI machine?

• To measure the Earth's magnetic field

• To form variable magnetic fields

• To transmit radio waves into the body

• To create a stable magnetic field around the patient

How do gradient magnets in an MRI machine differ from the main magnet?

• They are stronger than the main magnet

• They operate at a lower strength and form variable fields

• They are used to transmit radio waves

• They create a stable magnetic field

Why are hydrogen atoms specifically targeted in MRI scans?

• They are the most abundant element in the body

• They emit the brightest photons

• They have a high water content

• They align easily with the magnetic field

What happens to hydrogen atoms when the radio pulse is applied in an MRI machine?

• They stop rotating

• They switch alignments from north to south

• They emit photons immediately

• They become unstable

What makes MRI safer than X-rays for imaging the human body?

• MRI uses lower energy levels

• MRI does not use ionizing radiation

• MRI is faster than X-rays

• MRI can image all types of tissues