Evaluation of renal masses with CEST MRI: Protocol optimization and preliminary results

Area of Science:

• Magnetic Resonance Imaging
• Biomedical Engineering
• Oncology

Background:

• Renal mass characterization is crucial for diagnosis and treatment planning.
• Current imaging techniques have limitations in differentiating benign from malignant renal masses.
• Chemical Exchange Saturation Transfer (CEST) MRI is an emerging technique with potential for tissue characterization.

Purpose of the Study:

• To develop and evaluate a CEST MRI protocol for human kidney imaging.
• To assess the feasibility of using CEST MRI for characterizing clear cell renal cell carcinoma (ccRCC).
• To investigate the diagnostic potential of CEST MRI in distinguishing ccRCC from healthy renal tissue.

Main Methods:

• CEST MRI scans were performed at 3 Tesla on 10 healthy volunteers and 5 patients with ccRCC.
• Magnetization Transfer Ratio Asymmetry (MTR_asym) values were compared between ccRCC tumors and healthy kidney cortex across different frequency offsets.
• Correlation between CEST parameters and tumor characteristics (volume, necrosis, grade) was analyzed.

Main Results:

• Significant differences in MTR_asym values were observed between ccRCC tumors and healthy kidney cortex (p < 0.05).
• No significant differences in MTR_asym values were found in the contralateral kidney cortex of RCC patients compared to healthy controls (p > 0.7).
• CEST MRI shows potential for differentiating ccRCC from normal kidney parenchyma.

Conclusions:

• CEST MRI is a promising non-invasive imaging tool for renal mass characterization.
• The developed protocol enables differentiation of ccRCC from healthy kidney tissue.
• Further research is warranted to explore the full clinical utility of CEST MRI in nephro-oncology.