Contrast-enhanced harmonic endoscopic ultrasound

Area of Science:

• Medical Imaging
• Gastroenterology
• Oncology

Background:

• Second-generation intravenous blood-pool ultrasound contrast agents are vital in endoscopic ultrasound (EUS).
• They are used for microvascularization characterization, lesion diagnosis, and therapeutic guidance.
• Their nonlinear behavior is leveraged with contrast harmonic imaging techniques.

Purpose of the Study:

• To review the applications of second-generation contrast agents in EUS.
• To highlight their role in diagnosing focal pancreatic lesions.
• To discuss their potential in monitoring anti-angiogenic and chemotherapy treatments.

Main Methods:

• Utilizing contrast-specific modes with multi-pulse technology at low mechanical index (0.08-0.12).
• Employing dynamic contrast-enhanced ultrasound (DCE-US) for perfusion imaging.
• Analyzing time-intensity curves for quantification and monitoring.

Main Results:

• Distinguishing adenocarcinoma (hypovascular) from neuroendocrine tumors (hypervascular) in the pancreas.
• Challenges in differentiating pancreatitis from tumors due to variable vascularity.
• Promising results in longitudinal monitoring of advanced digestive cancers.

Conclusions:

• Second-generation contrast agents significantly advance EUS capabilities.
• They aid in differential diagnosis of pancreatic lesions and therapeutic guidance.
• DCE-EUS shows promise for monitoring treatment response in advanced cancers.