What is the typical reason for using a harmonic imaging technique in sonography?

Harmonic imaging is a technique utilized in sonography primarily to enhance image quality. This method takes advantage of the nonlinear propagation of ultrasound waves as they travel through tissues. When ultrasound waves are transmitted into the body, they can generate harmonic frequencies that are multiples of the original frequency. The second harmonic frequency, for example, contains improved information about the tissue, leading to images that have enhanced resolution and contrast.

In essence, harmonic imaging helps to reduce noise from the fundamental frequency and improves the visibility of small structures while maintaining a high signal-to-noise ratio. The resulting images are typically clearer, with better delineation of anatomical features that can assist in accurate diagnoses. Additionally, the use of harmonic frequencies can reduce artifacts, thereby further contributing to overall image quality.

Other aspects, such as minimizing side lobes or reducing examination time, while relevant in sonographic practices, are not the principal motivations for implementing harmonic imaging. Instead, they may be secondary benefits or related to other imaging optimizations, but the paramount goal remains the enhancement of image quality in diagnostic sonography.