What is defined as the frequency emitted by the transducer?

The correct answer, transmission frequency, refers specifically to the frequency of sound waves that are generated and emitted by the transducer during an ultrasound exam. This frequency is crucial because it directly influences the resolution and penetration of the ultrasound image produced.

Understanding transmission frequency helps to ascertain how effectively the ultrasound can visualize different structures within the body. Higher frequencies provide better resolution but have shallower penetration, making them suitable for imaging superficial structures. Conversely, lower frequencies penetrate deeper into the body but offer lower resolution, making them ideal for imaging deeper organs.

This concept is foundational in ultrasound imaging, as it affects both the quality of the images produced and the capabilities of the device for specific diagnostic tasks.