Integrated slice-specific dynamic shimming diffusion weighted imaging (DWI) for rectal Cancer detection and...

Area of Science:

• Medical Imaging
• Oncology
• Radiology

Background:

• Rectal cancer diagnosis relies heavily on Magnetic Resonance Imaging (MRI) techniques.
• Diffusion-weighted imaging (DWI) is crucial for characterizing rectal tumors.
• Optimizing DWI protocols is essential for improving diagnostic accuracy.

Purpose of the Study:

• To compare the image quality and pathological characterization capabilities of integrated slice-specific dynamic shimming diffusion-weighted imaging (iShim-DWI) versus single-shot echo-planar imaging diffusion-weighted imaging (SS-EPI-DWI) in rectal cancer.
• To evaluate the potential of iShim-DWI in differentiating rectal tumors and predicting their pathological grade.

Main Methods:

• Retrospective analysis of 193 rectal tumor patients.
• Comparison of iShim-DWI (b=0, 800, 1600 s/mm²) and SS-EPI-DWI (b=0, 1000 s/mm²).
• Qualitative (image quality, artifacts) and quantitative (SNR, CNR, ADC values) assessments by two readers.

Main Results:

• iShim-DWI demonstrated significantly higher image quality scores compared to SS-EPI-DWI (P < 0.001).
• iShim-DWI showed reduced background signal standard deviation and higher SNR/CNR.
• Lower apparent diffusion coefficient (ADC) values were observed in poorly differentiated tumors, with ROC analysis confirming significance.

Conclusions:

• iShim-DWI is a promising technique for rectal tumor imaging, offering high image quality.
• iShim-DWI has the potential to differentiate rectal cancer from normal tissue.
• iShim-DWI can aid in predicting the pathological characterization of rectal cancer.