Characterization of parotid gland tumors using diffusion-relaxation correlation spectrum imaging: a preliminary study

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• Parotid gland tumors require accurate characterization for appropriate treatment.
• Diffusion-relaxation correlation spectrum imaging (DR-CSI) offers a novel approach to tissue characterization.

Purpose of the Study:

• To evaluate the efficacy of DR-CSI in differentiating parotid gland tumors, including pleomorphic adenomas (PA), Warthin's tumors (WT), and malignant tumors (MT).

Main Methods:

• Prospective recruitment of 25 PA, 9 WT, and 7 MT patients.
• Acquisition of DR-CSI data with 7 b-values and 5 TEs.
• Analysis of Diffusion (D)-T2 signal spectra, dividing them into three compartments (low D - A, mediate D - B, high D - C) and comparing volume fractions (V_A, V_B, V_C) among tumor types.

Main Results:

• Distinct D-T2 spectra were observed for each tumor subtype.
• Pleomorphic adenomas showed significantly different V_A, V_B, and V_C compared to Warthin's tumors (p<0.05).
• Malignant tumors also exhibited significantly different V_A, V_B, and V_C compared to pleomorphic adenomas (p<0.05).
• Volume fraction B (V_B) demonstrated excellent diagnostic performance (AUC 0.969 for PA vs WT, AUC 0.994 for PA vs MT).

Conclusions:

• DR-CSI is a promising non-invasive technique for parotid gland tumor characterization.
• The V_B parameter derived from DR-CSI shows high potential for differentiating benign from malignant parotid tumors.