1 | Page
DAVIES Ultrasound Physics Exam 2
Questions and 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 Ans: 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 Ans: B. Increased focusing
© 2025 All rights reserved
, 2 | Page
Another name for axial resolution Ans: Range
What statement describes a phased array transducer? Ans:
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
C. Curved crystal
D. Matching layer Ans: D. Matching layer
What type of focusing decreases the frame rate (temporal
resolution)? Ans: Multiple transmit
The ability to distinguish between adjacent structures that
produce echoes of similar amplitude is Ans: Contrast
resolution
© 2025 All rights reserved
, 3 | Page
Electronic focusing in the transmit mode is accomplished
using Ans: Time delays to excite transducer elements
When increasing the number of transmit focal zones to
improve spatial resolution, the trade-off is Ans: Lateral
resolution vs. temporal
Lateral resolution is determined by Ans: 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: Ans: Axial resolution
The property of certain materials to create a voltage when
they are mechanically deformed is called Ans: Piezoelectric
effect
Axial resolution is equal to Ans: 1/2 SPL or SPL/2
The formula for the Q factor is Ans: Frequency divided by
the bandwidth
© 2025 All rights reserved
, 4 | Page
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
D. Increased bandwidth Ans: 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 Ans: B. Is made
of air
© 2025 All rights reserved
DAVIES Ultrasound Physics Exam 2
Questions and 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 Ans: 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 Ans: B. Increased focusing
© 2025 All rights reserved
, 2 | Page
Another name for axial resolution Ans: Range
What statement describes a phased array transducer? Ans:
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
C. Curved crystal
D. Matching layer Ans: D. Matching layer
What type of focusing decreases the frame rate (temporal
resolution)? Ans: Multiple transmit
The ability to distinguish between adjacent structures that
produce echoes of similar amplitude is Ans: Contrast
resolution
© 2025 All rights reserved
, 3 | Page
Electronic focusing in the transmit mode is accomplished
using Ans: Time delays to excite transducer elements
When increasing the number of transmit focal zones to
improve spatial resolution, the trade-off is Ans: Lateral
resolution vs. temporal
Lateral resolution is determined by Ans: 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: Ans: Axial resolution
The property of certain materials to create a voltage when
they are mechanically deformed is called Ans: Piezoelectric
effect
Axial resolution is equal to Ans: 1/2 SPL or SPL/2
The formula for the Q factor is Ans: Frequency divided by
the bandwidth
© 2025 All rights reserved
, 4 | Page
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
D. Increased bandwidth Ans: 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 Ans: B. Is made
of air
© 2025 All rights reserved
