Final answer:
The harmonic frequency is used in tissue harmonics for image production in medical imaging. It consists of multiples of the fundamental frequency, which improves image quality when used in ultrasound imaging.
Step-by-step explanation:
The name of the frequency used in tissue harmonics responsible for image production is the harmonic frequency. In the context of medical imaging, especially ultrasound, the fundamental frequency is the frequency emitted by the ultrasound transducer. As the sound waves propagate through tissue, nonlinear effects cause the creation of integer multiples of this original frequency, these multiples are known as harmonics. The first harmonic or fundamental frequency is the lowest-frequency resonance and is also referred to as the first overtone. Subsequent harmonics (second harmonic, third harmonic, etc.) correspond to higher multiples of the fundamental frequency which are used to improve image quality in harmonic imaging.