MR imaging of the small bowel

Area of Science:

• Radiology
• Gastroenterology
• Medical Imaging

Background:

• Cross-sectional imaging is crucial for small-bowel disorder evaluation.
• Concerns about ionizing radiation drive the search for alternative imaging methods.
• Magnetic resonance (MR) imaging presents a radiation-free option with unique advantages.

Purpose of the Study:

• To explore the role and applications of MR imaging in diagnosing small-bowel disorders.
• To compare the benefits and drawbacks of MR imaging against computed tomography (CT).
• To highlight MR imaging's utility in specific patient groups and conditions like Crohn disease.

Main Methods:

• MR imaging techniques including enterography and enteroclysis were reviewed.
• Contrast agents were classified based on T1- and T2-weighted signal intensities.
• Clinical indications and findings associated with MR imaging of the small bowel were analyzed.

Main Results:

• MR imaging offers advantages such as no ionizing radiation, dynamic functional information, and superior soft-tissue contrast.
• Limitations include higher cost, accessibility issues, and lower spatial/temporal resolution than CT.
• Key indications include Crohn disease, radiation sensitivity, CT contraindications, and low-grade obstruction.

Conclusions:

• MR imaging is a valuable tool for small-bowel evaluation, especially for Crohn disease requiring follow-up.
• It effectively visualizes active inflammation and complications like penetrating disease and obstruction.
• MR imaging provides a safe and informative alternative to radiation-based techniques for specific patient populations.