Diffusion-weighted MR imaging of native and transplanted kidneys.

Area of Science:

• Radiology
• Medical Imaging
• Nephrology

Background:

• Diffusion-weighted (DW) magnetic resonance (MR) imaging is increasingly used beyond the brain.
• Technical advancements enable noninvasive imaging, crucial for patients with renal insufficiency.
• DW MR imaging provides quantitative metrics through the apparent diffusion coefficient (ADC).

Purpose of the Study:

• To explore the applications of DW MR imaging in evaluating renal function and disease.
• To assess the utility of ADC measurements in diagnosing various renal conditions.
• To evaluate the potential of DW MR imaging in assessing kidney transplant outcomes.

Main Methods:

• Utilizing DW MR imaging with biexponential fitting to separate diffusion and perfusion.
• Quantifying renal function and pathology using the apparent diffusion coefficient (ADC).
• Analyzing signal intensity changes on high-b-value images and ADC maps.

Main Results:

• Decreased ADC values correlate with impaired renal function in acute or chronic renal failure.
• Acute ureteral obstruction and renal artery stenosis show characteristic ADC changes.
• Pyelonephritis presents with altered signal intensities on DW images and ADC maps.
• DW MR imaging shows promise for assessing kidney allograft deterioration.

Conclusions:

• DW MR imaging is a valuable tool for the functional evaluation of kidneys.
• ADC measurements can detect and characterize renal pathologies, including failure, obstruction, and inflammation.
• This noninvasive technique shows potential for monitoring kidney transplant recipients.