Looking at MRI

The Physics Principle of Magnetic Resonance Imaging (MRI)

Watch to understand this 1.20 minutes video and answer the following questions.

You can pause, replay and take a note during listening to the video.

The maximum time allocation for each question is only 5 minutes.

Multiple Choice

MRI use ________ (hydrogen atom) that are abundant in the human body. This hydrogen atom mainly made of water molecule.

• protons

• electrons

• neutrons

Multiple Choice

All proton (hydrogen atom) inside the human body is not static but always spin. All protons that spin will create small ___________ (like a small bar magnet). However this will not produce any effect because it is very small and the direction of the force is not orientated.

• radiation

• ultrasound

• magnetic charge

Multiple Choice

When a human being is place inside the strong magnetic field (example: lie down inside the MRI machine), the protons will ______ with the strong magnetic field. Now, all the protons (hydrogen atom) will have same direction and bigger magnetic field.

• align

• form 90 degree direction

• static

Multiple Choice

When a radiographer that work in the MRI machine introduces (turn-on) a _________ pulse, it will distract the align protons (hydrogen atom) & force it to other direction either 90 or 180 degree.

• radiotherapy

• radiobiology

• radiofrequency

Listen again this video before you proceed to other questions.

Multiple Choice

Then, when an MRI radiographer turned-off the radiofrequency pulse, the proton ___________ to the magnetic field direction (come back to early state)

• recalibrate

• realign

• reproduce

Multiple Choice

When protons (hydrogen atom) realign parallel to early magnetic field, it will release _________ energy. This energy will be detected by MRI machine and convert it as MRI image based on the body part.

• kinetic

• potential

• electromagnetic