Question

Which ultrasound frequency is most suitable for producing a picture
(from the front of the chest) of an adult heart’s Coronary Sinus (CS)?

		a)   2-4 Hz
		b) 8 MHz
		c) 30 MHz

In 1999, O’Leary showed that a certain characteristic of the carotid artery

(as measured by ultrasound) is strongly associated with risk of myocardial
infarction and stroke. What was this characteristic?

		a) Thickness of the carotid artery’s lumen
		b)  Thickness of the carotid artery’s intima+ media
		c) Diameter of the carotid artery, the lumen + intima + media + adventitia

Answer 1

1) Ans is c= 30MHZ

Ultrasound has a frequency above the range audible by humans ( less than 20,000HZ). diagnostic ultrasound waves uses in range of 2- 15 MHZ are uses. For adult cardiac imaging uses 4- 7 MHZ. But INTRAVASCULAR transducer uses frequency 30MHZ. High wave increased resolution but decrease the tissue penetration.

2) Ans is B= thickness of the carotid artery intima + media.

In this topic many researchers studied and showed that the increase in the thickness of intima and media of carotid artery as measured non invasively by ultrasound as directly associated with increase the risk of myocardial infarction and stroke in adults without a history of cardiovascular diseases.