What frequency range is typically utilized by diagnostic medical ultrasound transducers for imaging human internal organs?
Answer and explanation
Correct answer: A. 1 MHz to 20 MHz
- Step 1: Ultrasound by definition exceeds the human audible upper threshold of 20 kHz. Step 2. For clinical diagnostic imaging, transducers employ high-frequency ultrasound between 1 MHz and 20 MHz (megahertz) to balance tissue penetration depth with spatial imaging resolution. Answer: 1 MHz to 20 MHz. Why not the others: 20 Hz to 20,000 Hz represents the audible acoustic range for healthy human hearing; 50 Hz to 60 Hz is standard alternating current (AC) electrical grid power frequency; 1 GHz to 5 GHz represents microwave radiofrequency bands used in Wi-Fi and mobile telecommunications.
Practise more Medical Mechanics, Fluids and Thermal Physics.
Free questions with an explanation for every one, and full timed Medical College Admission Test (Bangladesh) mock tests.
More Medical Mechanics, Fluids and Thermal Physics questions
- According to Poiseuille's Law, how is laminar volumetric blood flow rate Q through a blood vessel related to the vessel radius r? (Hard)
- What instrument is routinely used with a stethoscope to measure arterial blood pressure in clinical medicine?
- What produces the clinical Korotkoff sounds heard through a stethoscope (Hard) during arterial blood pressure measurement?
- What is the primary physiological function of pulmonary surfactant in human alveoli?
- According to the Law of Laplace (P = 2T / r), what would happen to smaller alveoli compared to larger ones if surfactant were completely abs…
- What clinical disorder in premature infants is caused by surfactant deficiency due to immature Type II alveolar pneumocytes?