Echo

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

Increasing system gain can reduce technical artifacts.

True or 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 are a greater problem with mechanical systems.
B.) They are generated from the edges of individual transducer elements.
C.) They display fuzzy areas on the image.
D.) They are a greater problem with phased-array systems.

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 meet at a right angle.
B.) The interventricular septum and the posterior aortic root wall meet.
C.) The interventricular septum and the anterior aortic root wall are contiguous.
D.) The interventricular septum and the anterior aortic root wall do not meet.

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

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