How is the near field characterized in ultrasound imaging?

The near field in ultrasound imaging is characterized by the presence of high-resolution echoes. This region, which is closest to the ultrasound transducer, is where the beam is relatively narrow and focused, allowing for detailed imaging of structures. The echoes produced here originate from tissues that are closer to the probe and are detected with greater clarity, resulting in enhanced resolution of the near-field structures. This aspect is crucial for obtaining accurate information about anatomical features in the vicinity of the transducer.

In contrast to other regions, the near field does not produce the strongest sound waves. Instead, the intensity diminishes as sound waves propagate through tissue. The choice of low-frequency pulses pertains to the characteristics of the sound waves used, but this doesn't accurately define the near field. Understanding the unique properties of the near field is essential for optimizing ultrasound imaging and achieving clear, high-quality images in clinical practice.