Ace the Ultrasound Physics II Exam 2026 – Tune Up Your Skills and Sound Off Success!

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards

From $12.50Unlock all

Session length

1 / 20

What is the typical frequency-attenuation relationship in soft tissue, and what is α at 1 MHz?

α ≈ 1.0 dB/(cm·MHz); at 1 MHz, α ≈ 1.0 dB/cm

α ≈ 0.5 dB/(cm·MHz); at 1 MHz, α ≈ 0.5 dB/cm

Attenuation in soft tissue increases roughly in proportion to frequency because higher-frequency waves experience more absorption and scattering as they travel. The commonly used relation is α ≈ α0 × f, with α0 about 0.5 dB/(cm·MHz) for soft tissue. This means the attenuation per centimeter is 0.5 dB for every megahertz of frequency. At 1 MHz, α ≈ 0.5 dB/cm. This standard value reflects typical tissue properties, so it best matches the expected relationship and the α at 1 MHz.

α ≈ 0.3 dB/(cm·MHz); at 1 MHz, α ≈ 0.3 dB/cm

α ≈ 0.8 dB/(cm·MHz); at 1 MHz, α ≈ 0.8 dB/cm