Evaluation of parotid gland function using equivalent cross-relaxation rate imaging applied magnetization transfer...

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Evaluating parotid gland function is crucial after chemoradiotherapy for head and neck cancers.
• Current functional assessment methods may have limitations.
• There is a need for safe and reliable imaging tools to measure parotid gland function.

Purpose of the Study:

• To validate the utility of equivalent cross-relaxation rate imaging (ECRI), a magnetic resonance imaging (MRI) tool, for assessing parotid gland function.
• To investigate the correlation between ECRI-derived values and salivary gland scintigraphy parameters.
• To explore the dose-response relationship between radiation dose and parotid gland function measured by ECRI and scintigraphy.

Main Methods:

• Eighteen patients with head and neck cancer underwent ECRI and salivary gland scintigraphy.
• ECR values (signal intensity) from ECRI were calculated.
• Maximum uptake rate (MUR) and washout rate (WOR) were derived from scintigraphy data.
• Correlations between ECR, MUR, and WOR were analyzed, along with dose-response relationships.

Main Results:

• A significant correlation was found between ECR values and MUR (uptake function) both pre- and post-treatment.
• A significant post-treatment correlation was observed between the percentage change in ECR values and the median parotid gland radiation dose.
• No significant correlations were detected between median parotid gland dose and MUR or WOR.

Conclusions:

• ECRI is a novel MRI technique capable of evaluating parotid gland uptake function.
• ECRI demonstrates potential as a functional imaging tool for parotid glands following chemoradiotherapy.
• This method may provide a more sensitive measure of radiation-induced changes in parotid gland uptake function compared to traditional scintigraphy parameters.