Physiologic measurements by contrast-enhanced MR imaging: expectations and limitations

Area of Science:

• Biomedical Imaging
• Radiology
• Medical Physics

Background:

• Contrast-enhanced magnetic resonance imaging (CE-MRI) enables quantitative assessment of tissue physiologic properties.
• Key parameters include perfusion, blood volume, and capillary permeability, crucial for characterizing pathophysiology.
• Quantitative CE-MRI aids in monitoring therapeutic interventions over time.

Purpose of the Study:

• To provide a perspective on the application of quantitative contrast-enhanced MRI.
• To analyze the accuracy of derived physiologic parameters from CE-MRI.
• To offer recommendations for optimal pulse sequence selection in quantitative CE-MRI.

Main Methods:

• Review of quantitative analysis techniques for contrast-enhanced MRI data.
• Assessment of the impact of simplified tissue models and signal intensity assumptions.
• Evaluation of pulse sequence choices for accurate parameter estimation.

Main Results:

• The accuracy of quantitative CE-MRI parameters is significantly influenced by underlying model simplifications.
• Assumptions relating signal intensity to contrast agent concentration are critical for reliable quantitation.
• Pulse sequence selection directly impacts the precision and validity of derived physiologic measures.

Conclusions:

• Quantitative contrast-enhanced MRI is a powerful tool for assessing tissue physiology.
• Careful consideration of modeling assumptions and pulse sequence parameters is essential for accurate results.
• Optimized quantitative CE-MRI protocols can enhance diagnostic capabilities and therapeutic monitoring.