Which ultrasound system control automatically calibrates for measurements?
D. ) Depth. Depth control automatically adjusts (or calibrates) depth markers.
Increasing system gain can reduce technical artifacts.
True or False
False: Increasing gain will increase specular echoes, which generally increases artifacts.
The purpose of the time-gain compensation (TGC) circuit is:
C. ,b., and d.
Which of the following are true regarding the side lobes seen in two-dimensional images?
a.) They are generated from the edge of individual transducer elements.
b.) They are greater problem with mechanical systems.
c.) They are a greater problem with phased-array systems.
d.) They display fuzzy areas on the image.
a and c.
In a parasternal long-axis transducer position, imaging is being done from the wrong intercostal space when:
B. c. and d.
Whith which of the following conditions would a contrast agent not likely be used to enhance the echo diagnosis?
D. ) Contrast agents are more helpful in defining suspected shunts.
Left-to-right shunts are more difficult than right-to-left shunts to detect with peripheral-vein contrast injections because:
a.) Contrast is totally filtered out at the pulmonary capillary level.
b.) Negative contrast is not as easy to identify as positive contrast.
c.) Microbubbles will not travel left to right because of pressure differences
d.) The microbubbles traveling from the right side into the left are rare and difficult to see.
b and d
In which condition could amyl nitrite be useful?
A. ) Amyl nitrite may increase the systolic anterior motion(SAM) of the anterior mitral valve leaflet in IHSS
In the patient with hypertrophic obstructive cardiomyopathy (HOCM) with no systolic anterior motion (SAM) at rest, SAM may be demonstrated by the use of:
D. ) and b.)
When using a large sample volume in performing a Doppler examination, the operator:
C. ) and c.)
The apical four-chamber view is frequently the first approach for a Doppler study because:
B. ) There is no single "easiest" location for Doppler imaging. The transducer is closer to the valves in the parasternal views. Since the Doppler beam is parallel to the mitral, aortic, and tricuspid valves at the apex, this is a good screening location. Since may jets are eccentric, it may not be true that "more" abnormalities are detected from the apex-a low parasternal view is used very successfully with color flow.
Parasternal long-axis views are good for Doppler applications because of the relationship of angle to flow.
True or False
False: Optimal Doppler angles are 0degrees or 180 degrees. parasternal views approximate angles of 90 degrees diving a cosine of 0.0.