RadiologyLesson 1 of 2 in the course Magnetic resonance imaging

MRI Principles, Specialized Techniques, Clinical Uses, and Safety

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Magnetic resonance imaging (MRI) creates detailed pictures of anatomy and some physiological processes inside the body. This lesson introduces the purpose of MRI, its relationship to nuclear magnetic resonance, and key milestones in its development.

MRI is a medical imaging technique used to help diagnose, stage, and follow diseases. A scanner uses a strong magnetic field, magnetic field gradients, and radiofrequency (RF) waves to create images. Unlike computed tomography (CT) and positron emission tomography (PET), MRI does not use X-rays or other ionizing radiation.

All flashcards

T1 relaxation
Recovery of longitudinal magnetization along the direction of the main magnetic field.
T2 relaxation
Loss of synchronized transverse magnetization in the plane perpendicular to the main magnetic field.
Magnetic resonance spectroscopy (MRS)
An MRI-related method that measures resonances associated with metabolites to provide information about tissue chemistry.
Quantitative MRI
An approach that estimates physical parameters such as T1, T2, or magnetic susceptibility.
Magnetic resonance venography (MRV)
An MRI technique used to image veins.

Quiz questions

  1. What did Paul Lauterbur propose in 1973 to form a two-dimensional NMR image?Answer: Using magnetic field gradients to encode spatial position.
  2. How does parallel MRI use an array of receiver coils to accelerate acquisition?Answer: It combines coil signals and sensitivity patterns to reconstruct images from fewer gradient steps.
  3. What is a common effect of most intravenous gadolinium-based MRI agents?Answer: They shorten T1, often brightening targeted regions on T1-weighted images.
  4. How should the MRI safety of a patient's implant be assessed?Answer: Check its specific labeling and MRI conditions rather than assuming it is safe.
  5. What does functional MRI primarily track when studying brain activity?Answer: Changes associated with blood flow and oxygenation.

Based on the Wikipedia article Magnetic resonance imaging, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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