DAVIES Ultrasound Physics Exam 2 Questions with Answers
(100% Correct Answers)
Which probe would provide the best axial resolution to measure the thickness of a small
structure?
A. 10 Mhz
B. 2.5 Mhz
C. 5 Mhz
D. 7 Mhz —Answer: A. 10 Mhz
Which of the following will NOT improve axial resolution?
A. Increased transducer frequency
B. Increased focusing
C. Increased damping
D. Decreased pulse length —Answer: B. Increased focusing
Another name for axial resolution —Answer: Range
What statement describes a phased array transducer? —Answer: Electronically focused along
the length of the array and electronically steered
The sound beam can be focused by all of the following EXCEPT
A. Acoustic mirror
B. Acoustic lens
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,C. Curved crystal
D. Matching layer —Answer: D. Matching layer
What type of focusing decreases the frame rate (temporal resolution)? —Answer: Multiple
transmit
The ability to distinguish between adjacent structures that produce echoes of similar amplitude
is —Answer: Contrast resolution
Electronic focusing in the transmit mode is accomplished using —Answer: Time delays to
excite transducer elements
When increasing the number of transmit focal zones to improve spatial resolution, the trade-off
is —Answer: Lateral resolution vs. temporal
Lateral resolution is determined by —Answer: Beam width
In measuring the width (diameter) of the common carotid artery in a long axis view, or in
measuring the LV inferolateral wall in the PLAX view, you would primarily be concerned with:
—Answer: Axial resolution
The property of certain materials to create a voltage when they are mechanically deformed is
called —Answer: Piezoelectric effect
Axial resolution is equal to —Answer: 1/2 SPL or SPL/2
The formula for the Q factor is —Answer: Frequency divided by the bandwidth
Which of the following is NOT an advantage of using piezoelectric material?
A. Decreased bandwidth
B. Lower acoustic impedance of crystal so matching layers are more efficient
C. Increased sensitivity
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, D. Increased bandwidth —Answer: Decreased bandwidth
Which of the following is NOT true of the backing layer found in a transducer?
A. Is made of epoxy resin with tungsten
B. Is located behind the crystal
C. Is made of air
D. Utilized to stop the crystal from ringiing —Answer: B. Is made of air
How is beam steering accomplished in an annular transducer? —Answer: Mechanically
What type of image does a linear segmental (sequential or sequenced) array produce? —
Answer: Rectangular image
Dividing a normal crystal element into many smaller elements is termed —Answer: Subdicing
Electronic slope results in steering of the sound beam. It is accomplished by altering the: —
Answer: Electronic pattern for excitation of the crystals
The ability to see two separate echoes which are in a plane perpendicular to the sound beam is
known as —Answer: Angular resolution
Transducer sterilization can be performed by all of the following techniques except:
A. Cold sterilization
B. Disinfectant solutions as per manufacturer recommendations
C. Autoclave sterilization
D. All of the above can be used —Answer: B. Autoclave sterilization
Receiver demodulation can not be controlled by the sonographer. —Answer: True
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(100% Correct Answers)
Which probe would provide the best axial resolution to measure the thickness of a small
structure?
A. 10 Mhz
B. 2.5 Mhz
C. 5 Mhz
D. 7 Mhz —Answer: A. 10 Mhz
Which of the following will NOT improve axial resolution?
A. Increased transducer frequency
B. Increased focusing
C. Increased damping
D. Decreased pulse length —Answer: B. Increased focusing
Another name for axial resolution —Answer: Range
What statement describes a phased array transducer? —Answer: Electronically focused along
the length of the array and electronically steered
The sound beam can be focused by all of the following EXCEPT
A. Acoustic mirror
B. Acoustic lens
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,C. Curved crystal
D. Matching layer —Answer: D. Matching layer
What type of focusing decreases the frame rate (temporal resolution)? —Answer: Multiple
transmit
The ability to distinguish between adjacent structures that produce echoes of similar amplitude
is —Answer: Contrast resolution
Electronic focusing in the transmit mode is accomplished using —Answer: Time delays to
excite transducer elements
When increasing the number of transmit focal zones to improve spatial resolution, the trade-off
is —Answer: Lateral resolution vs. temporal
Lateral resolution is determined by —Answer: Beam width
In measuring the width (diameter) of the common carotid artery in a long axis view, or in
measuring the LV inferolateral wall in the PLAX view, you would primarily be concerned with:
—Answer: Axial resolution
The property of certain materials to create a voltage when they are mechanically deformed is
called —Answer: Piezoelectric effect
Axial resolution is equal to —Answer: 1/2 SPL or SPL/2
The formula for the Q factor is —Answer: Frequency divided by the bandwidth
Which of the following is NOT an advantage of using piezoelectric material?
A. Decreased bandwidth
B. Lower acoustic impedance of crystal so matching layers are more efficient
C. Increased sensitivity
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, D. Increased bandwidth —Answer: Decreased bandwidth
Which of the following is NOT true of the backing layer found in a transducer?
A. Is made of epoxy resin with tungsten
B. Is located behind the crystal
C. Is made of air
D. Utilized to stop the crystal from ringiing —Answer: B. Is made of air
How is beam steering accomplished in an annular transducer? —Answer: Mechanically
What type of image does a linear segmental (sequential or sequenced) array produce? —
Answer: Rectangular image
Dividing a normal crystal element into many smaller elements is termed —Answer: Subdicing
Electronic slope results in steering of the sound beam. It is accomplished by altering the: —
Answer: Electronic pattern for excitation of the crystals
The ability to see two separate echoes which are in a plane perpendicular to the sound beam is
known as —Answer: Angular resolution
Transducer sterilization can be performed by all of the following techniques except:
A. Cold sterilization
B. Disinfectant solutions as per manufacturer recommendations
C. Autoclave sterilization
D. All of the above can be used —Answer: B. Autoclave sterilization
Receiver demodulation can not be controlled by the sonographer. —Answer: True
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