Bioeffects

Question 1

The mechanical index (MI) is an indication of the likelihood of

Answer 1

Cavitation

Question 2

The thermal index (TI) is an indication of the likelihood of

Answer 2

heating

Question 3

Means by which ultrasound energy could induce a biological effect include:

Answer 3

heating, cavitation, mechanical effects other than cavitation.

Question 4

The two types of cavitation are

Answer 4

Stable and transient

Question 5

ALARA Translates to

Answer 5

As Low As Reasonable Achievable

Question 6

Exposure is minimised by only using ultrasound when

Answer 6

it is clinically indicated, with minimum intensity and operating time,

Question 7

What factors effect exposure to an embryo?

Answer 7

distance to embryo, operating frequency and gain

Question 8

True or False: US should not be used as a diagnostic tool because of potential bioeffects it can produce.

Answer 8

False.

Question 9

What relates directly to tissue heating

Answer 9

absorption

Question 10

As far as we know now, which of the following is the most correct and informative response to a patient’s question, “Will this hurt me or my baby?

Answer 10

there is no known risk with ultrasound imaging as it is applied currently