What is the typical value range for Duty Factor in imaging?

The typical value range for Duty Factor in imaging is usually expressed as a small percentage because it reflects the proportion of time that ultrasound is actively transmitted compared to the total time of the pulse cycle, which includes both the active and inactive phases. Duty Factor is calculated as the ratio of the pulse duration to the pulse repetition period.

In imaging applications, especially when using continuous wave ultrasound for scanning, a low Duty Factor is preferred to minimize heating and tissue damage. The correct range of 0.002% to 0.005% indicates a fraction of a percent that signifies how little time the ultrasound is actively transmitting compared to the overall time. This small range represents a typical scenario for diagnostic imaging, ensuring that tissues are subjected to ultrasound energy for only a brief interval, thus maintaining safety while still allowing for effective imaging.

The other ranges provided do not accurately reflect typical Duty Factor values observed in diagnostic ultrasound practices, as they suggest much higher levels of active transmission duration which would not be ideal for imaging protocols.