Evaluation of intrarenal oxygenation at 3.0 T using 3-dimensional multiple gradient-recalled echo sequence

Area of Science:

• Medical Imaging
• Renal Physiology
• Biophysics

Background:

• Intrarenal oxygenation is crucial for kidney function.
• Accurate measurement of renal oxygenation is challenging.
• Previous methods often lack comprehensive spatial or temporal resolution.

Purpose of the Study:

• To validate quantitative R2* and DeltaR2* measurements using a 3D multiple gradient-recalled echo (mGRE) sequence.
• To assess the utility of this technique for evaluating intrarenal oxygenation in humans.
• To compare 3D mGRE performance against established 2D techniques.

Main Methods:

• Validation involved comparing 3D mGRE R2* values with existing 2D methods.
• DeltaR2* was measured by assessing changes in R2* after intravenous furosemide administration.
• Scans were performed at 1.5 T and 3.0 T for comparative analysis.

Main Results:

• 3D mGRE R2* measurements demonstrated good agreement with 2D techniques.
• Baseline medullary R2* at 3.0 T was approximately double that at 1.5 T.
• Furosemide administration induced observable changes in R2* within 5 minutes.

Conclusions:

• 3D mGRE provides R2* measurements comparable to 2D techniques for renal oxygenation.
• This 3D implementation allows for efficient observation of temporal changes in medullary oxygenation.
• The technique offers improved spatial coverage without compromising temporal resolution.