Diffusion weighted imaging and diffusion tensor imaging in the evaluation of transplanted kidneys.

Area of Science:

• Nephrology
• Radiology
• Biomedical Engineering

Background:

• Kidney transplant recipients require regular monitoring for graft function.
• Non-invasive imaging techniques are crucial for assessing renal health and detecting impairment early.

Purpose of the Study:

• To investigate the relationship between renal function indexes and functional MRI parameters in kidney transplant recipients.
• To evaluate the utility of diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI) in assessing transplanted kidney function.

Main Methods:

• 40 kidney transplant recipients were divided into three groups based on creatinine clearance (CrCl) levels.
• MRI with DWI and DTI sequences was performed on a 1.5 Tesla scanner.
• Apparent diffusion coefficients (ADCs) and fractional anisotropy (FA) were measured in cortical and medullary regions and correlated with CrCl.

Main Results:

• Significant differences in medullary ADC and FA, and cortical ADC were observed between groups with varying CrCl.
• Medullary ADC showed the strongest correlation with CrCl (r=0.65).
• Medullary ADC and FA demonstrated high accuracy in predicting normal renal function and severe renal impairment.

Conclusions:

• DWI and DTI are valuable non-invasive tools for monitoring kidney transplant function.
• Medullary ADC is identified as the optimal parameter for assessing renal function in kidney transplant recipients.