What is the significance of using harmonics in ultrasound imaging?

The significance of using harmonics in ultrasound imaging lies primarily in their ability to enhance image quality by reducing noise and artifacts. This is achieved through a process called harmonic imaging, which takes advantage of the nonlinear propagation of sound waves in tissue. When ultrasound waves travel through the body, they can generate harmonics – frequencies that are multiples of the fundamental frequency of the transmitted ultrasound.

By capturing these harmonic signals, the ultrasound system can generate images that are clearer and have improved contrast. The fundamental frequency often includes unwanted noise and artifacts, but by focusing on the harmonic frequencies, the system can effectively reduce these disturbances. This results in images that better represent the underlying structure and pathology, making it easier for clinicians to make accurate diagnoses.

In contrast, the other options do not accurately reflect the role of harmonics in ultrasound. While harmonics can influence various aspects of imaging, such as sensitivity and resolution, they do not improve the speed of ultrasound pulses, provide measurements of tissue stiffness, or increase exposure time during imaging. Instead, they play a crucial role in enhancing the quality of the images produced, making option B the correct answer.