Question

Two of the body parts which do not appear in MRI are maybe
A. Molar teeth and eye lens
B. Scapula and canines
C. Ligaments and ribs
D. All of the above

Answer 1

Hint: MRI stands for Magnetic Resonance Imaging. It is used for obtaining the scans of the various internal structures in the body. However, hard parts of the body that contain less or no water like bones and teeth are not seen properly in MRI.

Complete answer: MRI is the abbreviated form for ‘Magnetic Resonance Imaging’. It is also known as ‘Nuclear Magnetic Resonance Imaging’ or NMRI. Also, it is popular by the name of ‘Magnetic Resonance Tomography’ or MRT. MRI scanners use strong magnetic fields or radio waves, and magnetic field gradients to produce the images of the organs in the body. MRI is used for the medical diagnosis of the body without exposing it to any type of radiation. In Magnetic Resonance Imaging technology, hydrogen atoms are used. These atoms generate the radio frequency signals which can be detected by the detectors. These detectors are placed in the proximity of the human body parts under examination, and the radio frequency signals are received by them. The human body is made up of eighty percent water which contains hydrogen atoms. The MRI scanners detect these hydrogen atoms and based on their detections they form the scans. But the human body parts that contain less to no water, are not produced in the MRI images. These body parts include bones and teeth mainly. Thus, based on the above information we can conclude that two of the body parts which do not appear in MRI are scapula and canines.
Hence, the correct answer is option B.

Note: MRI does not involve the use of the X-rays or the ionizing radiations. Due to this reason, it varies from the CT or Computed Tomography and PET or Positron Emitting Tomography scans. Actually, MRI is a medical application of nuclear magnetic resonance or NMR, which is also known as NMR spectroscopy. NMR is used for imaging in other applications as well.