What is the distance from the transducer to the focus called?

What is the distance from the transducer to the focus called?

• A. Focal length
• B. Focal distance
• C. Focus distance
• D. Transducer-to-focus distance

Answer: (A)

Focal length is the distance from the transducer to the focus. This describes where the ultrasound beam converges to its narrowest width and highest intensity, which is where the image resolution is best at a given depth. The focal length is set by the transducer’s design—such as the curvature of the element or an acoustic lens—and, in array transducers, can be adjusted to focus at different depths by changing the timing of the emitted waves. While you might hear terms like focal distance or focus distance, the standard term used is focal length.

Focal length is the distance from the transducer to the focus. This describes where the ultrasound beam converges to its narrowest width and highest intensity, which is where the image resolution is best at a given depth. The focal length is set by the transducer’s design—such as the curvature of the element or an acoustic lens—and, in array transducers, can be adjusted to focus at different depths by changing the timing of the emitted waves. While you might hear terms like focal distance or focus distance, the standard term used is focal length.