Echo

Which ultrasound system control automatically calibrates for measurements?
A. ) Overall gain.
B. ) Near gain.
C. ) Reject.
D. ) Depth.

Increasing system gain can reduce technical artifacts.

True or False
True False

The purpose of the time- gain compensation (TGC) circuit is:

a.) To suppress near-field echos.
b.) To enhance far-field echos.
c.) To selectively eliminate weak echos.
d.) To compensate for loss of ultrasound energy (attenuation) as the beam enters the body.

Which of the following are true regarding the side lobes seen in two-demensional images?
A. ) They display fuzzy areas on the image.
B. ) They are a greater problem with mechanical systems.
C. ) They are a greater problem with phased-array systems.
D. ) They are generated from the edges of individual transducer elements.

In a parasternal long-axis transducer position, imaging is being done from the wrong intercostal space when:
A. ) The interventricular septum and the anterior aortic root wall are contiguous.
B. ) The interventricular septum and the posterior aortic root wall meet.
C. ) The interventricular septum and the anterior aortic root wall do not meet.
D. ) The interventricular septum and the anterior aortic root wall meet at a right angle.

With which of the following conditions would a contrast agent not likely be used to enhance the echo diagnosis?
A. ) Atrial septal defect.
B. ) Ventricular septal defect.
C. ) Patent ductus arteriosus.
D. ) Idiopathic hypertrophic subaortic stenosis.

Left-to-right shunts are more difficult than right-to-left shunts to detect with peripheral-vein contrast injections because: