ARDMS SPI Ultrasound Bioeffects and Safety 5

Question 1

Which clinical scenario represents the LOWEST bioeffect risk from diagnostic ultrasound?

Accepted Answer

Color Doppler evaluation of a renal transplant in an adult

Answer

Adult renal transplant evaluation has no embryonic sensitivity concern and involves tissue with normal repair capacity, making it the lowest-risk scenario listed.

Question 2

Microstreaming as a non-thermal ultrasound bioeffect is best described as:

Accepted Answer

Localized, high-velocity fluid currents generated near an oscillating bubble interface

Answer

Microstreaming is the high-shear localized fluid motion that occurs immediately around a cavitating or oscillating bubble, capable of disrupting cell membranes.

Question 3

According to the AIUM, which statement about ultrasound use for 'entertainment' or 'keepsake' imaging is most appropriate?

Accepted Answer

It should be discouraged because it exposes the fetus without medical benefit

Answer

The AIUM and FDA discourage keepsake imaging because exposing the developing fetus without a medical indication violates the ALARA principle and provides no clinical benefit.

Question 4

The peak rarefactional pressure of an ultrasound pulse is most relevant to which type of bioeffect?

Accepted Answer

Mechanical cavitation

Answer

Peak rarefactional (negative) pressure determines whether dissolved gas can expand explosively to form cavitation bubbles, making it the key parameter for mechanical bioeffects.

Question 5

A research study reports a 'free-field' ISPTA value versus a 'derated' ISPTA.3 value. Which statement is correct?

Accepted Answer

Derated values are lower because they account for tissue attenuation between the transducer and target

Answer

Derated (ISPTA.3) values are calculated by applying 0.3 dB/cm/MHz attenuation to free-field water measurements, producing a lower, more clinically realistic intensity estimate.

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI Ultrasound Bioeffects and Safety 5