What could a technician do to increase the near zone in an ultrasound examination?

Increasing the near zone in an ultrasound examination is associated with the frequency of the ultrasound waves. The near zone, also known as the Fresnel zone, is the region closest to the transducer where the beam is still relatively collimated. When the frequency of the ultrasound wave is decreased, the wavelength becomes longer, which can lead to a decrease in the depth of the near zone. Conversely, increasing the frequency results in a shorter wavelength, which in turn enhances the ability of the ultrasound beam to maintain its focus over a greater distance.

As the frequency increases, the near zone effectively extends, allowing for improved resolution and imaging quality in the area closest to the transducer. Higher frequency ultrasound provides better spatial resolution, which is essential for accurately evaluating structures in the heart and surrounding areas during a cardiac ultrasound examination.

In summary, to achieve a greater near zone and improve image quality, a technician would increase the frequency of the ultrasound transducer being used.