Using the PRP formula, what imaging depth corresponds to 104 μs?

Using the PRP formula, what imaging depth corresponds to 104 μs?

• A. 7 cm
• B. 6 cm
• C. 5 cm
• D. 8 cm

Answer: (D)

PRP is the time for a ultrasound pulse to travel to a reflector and back. To get imaging depth from PRP, use depth = (PRP × speed of sound) / 2, since the pulse covers the round trip. In soft tissue, the speed of sound is about 1540 m/s, or 1.54 mm/μs. So for a PRP of 104 μs: - The round-trip distance is 104 μs × 1.54 mm/μs ≈ 160.16 mm. - One-way depth is half of that, ≈ 80.08 mm, which is about 8 cm. So the imaging depth corresponding to 104 μs is about 8 cm.

PRP is the time for a ultrasound pulse to travel to a reflector and back. To get imaging depth from PRP, use depth = (PRP × speed of sound) / 2, since the pulse covers the round trip.

In soft tissue, the speed of sound is about 1540 m/s, or 1.54 mm/μs. So for a PRP of 104 μs:

• The round-trip distance is 104 μs × 1.54 mm/μs ≈ 160.16 mm.

• One-way depth is half of that, ≈ 80.08 mm, which is about 8 cm.

So the imaging depth corresponding to 104 μs is about 8 cm.