Definition

Noun: 1. Magnetic Resonance Imaging: A medical imaging technique that uses a strong magnetic field and radio waves to generate detailed images of the inside of the body. It does not use ionizing radiation (like X-rays). The term specifically refers to the use of nuclear magnetic resonance of protons to produce images based on proton density and other tissue properties.

Usage

• As a subject or object: "MRI" is used as a countable noun, often preceded by "an" or "the."
• Common collocations:

Examples

• The doctor ordered an MRI to examine the patient's knee ligament.
• MRI is particularly useful for imaging soft tissues like the brain and muscles.
• She was nervous before her MRI scan because of the confined space.

Advanced Usage

• Functional MRI (fMRI): A specialized type of MRI that measures brain activity by detecting changes in blood flow.
  • Researchers used fMRI to see which areas of the brain were active during the task.
• Contrast-enhanced MRI: An MRI procedure where a contrast agent is injected to make certain tissues or abnormalities more visible.
  • The contrast-enhanced MRI provided a clearer view of the tumor's boundaries.

Variants and Related Words

• Magnetic Resonance Imaging (MRI): The full, formal name of the technique.
• NMR (Nuclear Magnetic Resonance): The fundamental physical principle upon which MRI is based, more commonly used in chemistry and physics contexts.
• Scanner / MRI Scanner: The machine used to perform the imaging.

Synonyms

• Magnetic Resonance Imaging: The full term; a direct synonym.
• MR Scan: A common abbreviated form used interchangeably in medical contexts.

Notes on Meaning

• The term "MRI" has largely replaced the older term "NMR imaging" in medical contexts to avoid the potentially alarming word "nuclear" for patients. The technique itself is non-invasive and does not involve nuclear radiation.

Noun

1. the use of nuclear magnetic resonance of protons to produce proton density images