Perfusion measurement using DCE-MRI: implications for hyperthermia.

Area of Science:

• Medical Imaging
• Biophysics
• Radiology

Background:

• Dynamic contrast-enhanced MRI (DCE-MRI) is widely used for body perfusion assessment.
• Current applications often rely on semiquantitative parameters, limiting precise perfusion quantification.
• Significant limitations include the lack of standardized imaging and evaluation techniques for tracer kinetics.

Purpose of the Study:

• To present imaging techniques using spoiled gradient echo sequences for DCE-MRI.
• To outline the fundamental principles for evaluating perfusion quantification.
• To address the challenges in assessing perfusion changes during hyperthermia using DCE-MRI.

Main Methods:

• Exploration of different spoiled gradient echo imaging sequences for DCE-MRI.
• Discussion of the basic principles for evaluating contrast agent tracer kinetics.
• Consideration of the arterial input function's systematic variation in hyperthermia studies.

Main Results:

• Hyperthermia alters the contrast agent bolus, resulting in an earlier, shorter, and more concentrated appearance in tissues.
• The study highlights the need to account for these bolus modifications for accurate perfusion quantification.
• Spoiled gradient echo sequences and specific evaluation methods are presented as potential solutions.

Conclusions:

• Accurate perfusion quantification with DCE-MRI remains challenging due to technical standardization issues.
• Understanding and accounting for the arterial input function's variability, particularly during hyperthermia, is essential.
• Further standardization of imaging and evaluation techniques is required for reliable DCE-MRI perfusion quantification.