What atom is manipulated during MRI to produce an image?

What atom is manipulated during MRI to produce an image?

• A. Calcium
• B. Oxygen
• C. Hydrogen
• D. Carbon

Answer: (C)

Hydrogen protons are manipulated during MRI to produce an image. The body has a lot of hydrogen in water and fat, giving a strong MR signal. In MRI, the hydrogen nucleus (one proton) has a favorable gyromagnetic ratio and high spin density, so when placed in a strong magnetic field its spins align. A radiofrequency pulse tips these spins, and as they realign, they emit signals that are detected and converted into images. The resulting image contrast mainly reflects hydrogen density and its relaxation properties (T1 and T2). Other elements like calcium, oxygen, or carbon are present but do not provide the same strong, readily detectable MR signals under standard clinical imaging, so they aren’t used to generate the image.

Hydrogen protons are manipulated during MRI to produce an image. The body has a lot of hydrogen in water and fat, giving a strong MR signal. In MRI, the hydrogen nucleus (one proton) has a favorable gyromagnetic ratio and high spin density, so when placed in a strong magnetic field its spins align. A radiofrequency pulse tips these spins, and as they realign, they emit signals that are detected and converted into images. The resulting image contrast mainly reflects hydrogen density and its relaxation properties (T1 and T2). Other elements like calcium, oxygen, or carbon are present but do not provide the same strong, readily detectable MR signals under standard clinical imaging, so they aren’t used to generate the image.