Chapter 11
What axis represents depth in A-mode?
X-axis
At a distance of two near-zone lengths, the beam diameter is _______ the diameter of the transducer element
Equal to
Does A-mode have a Z-axis?
No
Partial-volume artifact is also called ____________.
Section thickness artifact
Certain ultrasound systems are able to focus sound beams using small time delays during the reception. This focusing technique is called ___
Dynamic receive focusing
True or False?
B-mode represents brightness
True
Which of the following is not true of the linear sequenced array transducer?
The elements are arranged in a ring
True or False?
M-mode represents motion
True
Which of the following produces a pie-shaped image?
Phased array
Linear and convex are types of ________ arrays.
assembly
X-axis is depth & Z-axis is amplitude
Which image format is similar to that for convex array except that the footprint is smaller?
Vector
What is the display mode that provides information regarding reflector motion with respect to time?
M-mode
Arrays are operated in two ways, called ___________ and ___________.
sequencing; phasing
Coupling medium is applied to the transducer–tissue boundary to increase _________ of the sound wave.
transmission
For M-mode, what does the X-axis represent?
time
Which transducer will improve elevational resolution?
Annular phased array
With B-mode, which axis is related to the strength of the reflection?
Z-axis (amplitude)
In a single-element transducer, additional beams not included in the ultrasound beam are called _____________.
Side lobes
How is the sound beam of an annular phased array steered and focused?
mechanically steered and electronically focused
Which mode is demonstrated as a line of upward spikes?
A-mode
Which of the following best describes the sound beam of an annular phased array transducer?
Mechanically steered and electronically focused
Which mode provides the foundation for real-time, gray-scale anatomic imaging?
Which transducer type creates an entirely blank image when only one active element is damaged?
Mechanical
Which of the following transducers can be described as having the scan lines originate from a common point of origin?
Sector array