What is the primary purpose of using harmonics in ultrasound imaging?

The primary purpose of using harmonics in ultrasound imaging is to enhance image resolution. Harmonics take advantage of nonlinear propagation of sound waves through tissues. As ultrasound waves travel through the body, they create harmonic frequencies that are multiples of the original frequency. When these harmonic frequencies are used in imaging, they can provide clearer images with improved detail.

This enhancement occurs because harmonics often reduce the impact of tissue artifacts and increase contrast resolution, allowing for better visualization of small structures and improved delineation of boundaries between different tissues. Additionally, harmonic imaging often focuses on the higher frequency components of the signal, which typically yield sharper and more detailed images than the fundamental frequency.

While improving signal-to-noise ratio, reducing patient exposure, and increasing depth penetration are important aspects of ultrasound imaging, the specific use of harmonics is primarily aimed at enhancing image resolution by capitalizing on the characteristics of sound wave behavior in tissues.