The duty factor equation shows that it is related to both ______ and ______.

The duty factor equation shows that it is related to both ______ and ______.

• A. Pulse duration; Depth
• B. Pulse duration; PRF
• C. PRP; PRF
• D. Pulse duration; PRP

Answer: (D)

Duty factor is the fraction of time the ultrasound transducer is actively emitting during one transmit cycle. It depends on two quantities: how long each pulse lasts (pulse duration) and how long the full cycle lasts from the start of one pulse to the start of the next (pulse repetition period). The duty factor is pulse duration divided by PRP. Since PRF is the reciprocal of PRP, you can also express it as pulse duration multiplied by PRF. Depth doesn't set this fraction; it affects how deep you can image, not the on-time fraction of the cycle. So the relation is between pulse duration and PRP.

Duty factor is the fraction of time the ultrasound transducer is actively emitting during one transmit cycle. It depends on two quantities: how long each pulse lasts (pulse duration) and how long the full cycle lasts from the start of one pulse to the start of the next (pulse repetition period). The duty factor is pulse duration divided by PRP. Since PRF is the reciprocal of PRP, you can also express it as pulse duration multiplied by PRF. Depth doesn't set this fraction; it affects how deep you can image, not the on-time fraction of the cycle. So the relation is between pulse duration and PRP.