Artifacts in intravascular ultrasound imaging: analyses and implications

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Ultrasound Technology

Background:

• Intravascular ultrasound (IVUS) provides cross-sectional views of blood vessels.
• Image quality degradation in IVUS is caused by ultrasound behavior in heterogeneous tissues and catheter limitations.
• In vivo analysis of IVUS images is operator-dependent and prone to artifacts.

Purpose of the Study:

• To investigate the limitations of intravascular ultrasound imaging.
• To identify and analyze the specific causes of image artifacts in IVUS.
• To provide practical implications for improving IVUS image interpretation.

Main Methods:

• An in vitro study using plexiglass phantoms and fresh human artery segments.
• Utilized a 20 MHz transducer on a 4.8 F catheter with an interventional ultrasound system.
• Analyzed artifacts including geometric distortions, multiple echoes, point spread function (PSF), near-field effects, "petal-shaped" effect, and ultrasound speckle.

Main Results:

• Identified specific causes of image artifacts in intravascular ultrasound.
• Demonstrated that understanding these artifacts is crucial for accurate image analysis.
• Highlighted the impact of artifacts on qualitative and quantitative assessments.

Conclusions:

• A comprehensive understanding of IVUS artifacts is essential for maximizing the benefits of the technology.
• Knowledge of common pitfalls allows users to obtain higher quality images and better interpret results.
• This study provides a foundation for improved intravascular ultrasound imaging practices.