EDELMAN ULTRASOUND PHYSICS PART 2 QUESTIONS WITH CORRECT ANSWERS LATEST
UPDATE 2025/2026
As sound travels deeply into the far zone, the beam diverges, or spreads out. Which will result in
the greatest beam divergence deep in the far zone? - Answers Low frequency, small diameter.
Two ultrasound systems are identical except for the pulse repetition period of the emitted pulse.
What system will have the deeper focus? - Answers Their foci will be at the same depth.
Changes in PRP do not affect the depth of the focus.
All of the following terms describe the shape of a sound wave created by a tiny fragment of PZY
except:
A.Spherical
B.Huygens' wavelet
C.V-shaped
D.Hourglass shaped - Answers Hourglass shaped. The waves are not hourglass in shape.
What explains the difference in sound beam shape created by disc-shaped crystal from that of a
small chip of PZT? - Answers Huygen's Principle. This explains the difference between the beam
shape from the tiny chips of PZT and disc crystals of a larger dimension
Huygen's principle is based on __ - Answers Interference
The focus of an ultrasound beam is the location where the __ - Answers optimum transverse
resolution is. The focus of an ultrasound beam is the location where the beam is most narrow.
The lateral resolution of an ultrasound system is primarily determined by the__ - Answers Width
of the sound pulse. The lateral resolution achieved by an imaging system is approximately equal
to the width of the ultrasound pulse.
Two ultrasound systems produce acoustic pulses. One pulse is 0.4 microseconds in duration
and the other is 0.2 microseconds. Which pulse will most likely provide the best lateral
resolution?
A) 0.4 microsecond pulse
B) 0.2 microsecond pulse
C) they are the same
D) cannot be determined - Answers D. Duration of a pulse is unrelated to the lateral resolution.
The pulse duration does not profoundly influence the lateral resolution? True or false? - Answers
True.
,Two ultrasound systems have near zone lengths of 8 cm. At the focus, System G's lateral
resolution is 3.0 mm whereas system P's is 5.0 mm. Which system will produce higher quality
pictures at their foci? - Answers System G . It has a narrower beam and will produce higher
quality images at that depth.
When using the standard ultrasonic imaging instrumentation, the lateral resolution has a higher
numerical value than the axial resolution. True or false? - Answers True. Most imaging systems
have better axial resolution than lateral resolution.
Two ultrasound systems have near zone lengths of 8 cm. At their foci, System Q's lateral
resolution is 3.0 mm and system H's is 5.0 mm Which system will correctly display two small
structures at a depth of 8 cm? The objects are side by side and are 0.4 cm apart. - Answers
System Q.
The lateral resolution of an ultrasound system is 4 mm. Two structures are seperated by 3 mm
and lie side by side in relation to the sound beam's main axis. What will most likely appear on
the system's display? - Answers One echo.
True or false? When using an instrument typical of today's imaging devices, a higher frequency
transducer is likely to mildly improve the system's lateral resolution. - Answers True.
True or false? When using an instrument typical of today's diagnostic imaging devices, a higher
frequency transducer is likely to improve the axial resolution. - Answers True. Higher frequency
pulses have shorter pulse lengths.
What will lower the value of an ultrasound system's lateral resolution?
A. decrease the # of cycles in the pulse
B. increase the effective damping material
C. increase the PRP
D. use an acoustic lens - Answers D
What technique is internal focusing? - Answers Curved crystal.
What technique is external focusing? - Answers Lens.
What means adjustable focusing or multi focusing? - Answers Phased array
What technique is consistent with variable or multi-focusing? - Answers Electronic. (it is
adjusted by the sonographer)
What does not occur with focusing? - Answers Lower intensity at the focus. Focusing does not
lower the beam's intensity at the focus.
, In which region of a sound beam is focusing most effective? - Answers The end of the near
zone. (this area is called the focal zone)
True or false? In comparison to other locations along the length of an ultrasound beam,
focusing is generally ineffective in the far zone? - Answers True. Focusing narrows the width of
the sound beam to improve image quality.
Two ultrasound systems have near zone lengths of 8 cm. At the focus, System S's lateral
resolution is 3.0 mm, whereas System C's is 5.0 mm. Which system is most likely to
appropriately display two small body structures that lie, one in front of the other, at depths of
8.6 and 9.0 mm? - Answers Cannot be determined. No information on axial resolution.
The diameter of a disc-shaped, unfocused piezoelectric crystal is 1 cm. What is the best
estimate for the minimum lateral resolution of the ultrasound system? - Answers 5 mm.
The diameter of a disc-shaped, unfocused piezoelectric crystal is 1.2 cm. The near zone length
is 8 cm. What is the best estimate for the lateral resolution at a depth of 16 cm? - Answers 1.2
cm.
Which imaging modality places time-of-flight information on the x-axis and echo amplitude on
the y-axis? - Answers A-Mode.
Which imaging mode accurately displays reflector depth? - Answers A-Mode
Which imaging technique usually displays a single jagged line of varying heights? - Answers A-
Mode
With B-Mode, on which axis is the strength of the reflection input? - Answers z-axis
Which imaging modality places dots of dissimilar gray scale on the display? - Answers B-mode
The mode that produces lines related to the changing position of reflectors in the body with
respect to time is called __ - Answers M-mode
What does the x-axis of a B-Mode the y axis of an M-mode and the x-axis of an A-mode all relate?
- Answers Time of flight.
(With regard to mechanical transducers) True or false? The ultrasound beam is directed in many
different directions to create an imaging plane? - Answers True.
(With regard to mechanical transducers) True or false? The ultrasound beam is not focused
electronically. - Answers True.
(With regard to mechanical transducers) True or false? There is communication between the
pulser of the ultrasound system and the piezoelectric crystal of the transducer. - Answers True.
The transducer's PZT must be directly connected to the pulser electronics of the ultrasound
system.
UPDATE 2025/2026
As sound travels deeply into the far zone, the beam diverges, or spreads out. Which will result in
the greatest beam divergence deep in the far zone? - Answers Low frequency, small diameter.
Two ultrasound systems are identical except for the pulse repetition period of the emitted pulse.
What system will have the deeper focus? - Answers Their foci will be at the same depth.
Changes in PRP do not affect the depth of the focus.
All of the following terms describe the shape of a sound wave created by a tiny fragment of PZY
except:
A.Spherical
B.Huygens' wavelet
C.V-shaped
D.Hourglass shaped - Answers Hourglass shaped. The waves are not hourglass in shape.
What explains the difference in sound beam shape created by disc-shaped crystal from that of a
small chip of PZT? - Answers Huygen's Principle. This explains the difference between the beam
shape from the tiny chips of PZT and disc crystals of a larger dimension
Huygen's principle is based on __ - Answers Interference
The focus of an ultrasound beam is the location where the __ - Answers optimum transverse
resolution is. The focus of an ultrasound beam is the location where the beam is most narrow.
The lateral resolution of an ultrasound system is primarily determined by the__ - Answers Width
of the sound pulse. The lateral resolution achieved by an imaging system is approximately equal
to the width of the ultrasound pulse.
Two ultrasound systems produce acoustic pulses. One pulse is 0.4 microseconds in duration
and the other is 0.2 microseconds. Which pulse will most likely provide the best lateral
resolution?
A) 0.4 microsecond pulse
B) 0.2 microsecond pulse
C) they are the same
D) cannot be determined - Answers D. Duration of a pulse is unrelated to the lateral resolution.
The pulse duration does not profoundly influence the lateral resolution? True or false? - Answers
True.
,Two ultrasound systems have near zone lengths of 8 cm. At the focus, System G's lateral
resolution is 3.0 mm whereas system P's is 5.0 mm. Which system will produce higher quality
pictures at their foci? - Answers System G . It has a narrower beam and will produce higher
quality images at that depth.
When using the standard ultrasonic imaging instrumentation, the lateral resolution has a higher
numerical value than the axial resolution. True or false? - Answers True. Most imaging systems
have better axial resolution than lateral resolution.
Two ultrasound systems have near zone lengths of 8 cm. At their foci, System Q's lateral
resolution is 3.0 mm and system H's is 5.0 mm Which system will correctly display two small
structures at a depth of 8 cm? The objects are side by side and are 0.4 cm apart. - Answers
System Q.
The lateral resolution of an ultrasound system is 4 mm. Two structures are seperated by 3 mm
and lie side by side in relation to the sound beam's main axis. What will most likely appear on
the system's display? - Answers One echo.
True or false? When using an instrument typical of today's imaging devices, a higher frequency
transducer is likely to mildly improve the system's lateral resolution. - Answers True.
True or false? When using an instrument typical of today's diagnostic imaging devices, a higher
frequency transducer is likely to improve the axial resolution. - Answers True. Higher frequency
pulses have shorter pulse lengths.
What will lower the value of an ultrasound system's lateral resolution?
A. decrease the # of cycles in the pulse
B. increase the effective damping material
C. increase the PRP
D. use an acoustic lens - Answers D
What technique is internal focusing? - Answers Curved crystal.
What technique is external focusing? - Answers Lens.
What means adjustable focusing or multi focusing? - Answers Phased array
What technique is consistent with variable or multi-focusing? - Answers Electronic. (it is
adjusted by the sonographer)
What does not occur with focusing? - Answers Lower intensity at the focus. Focusing does not
lower the beam's intensity at the focus.
, In which region of a sound beam is focusing most effective? - Answers The end of the near
zone. (this area is called the focal zone)
True or false? In comparison to other locations along the length of an ultrasound beam,
focusing is generally ineffective in the far zone? - Answers True. Focusing narrows the width of
the sound beam to improve image quality.
Two ultrasound systems have near zone lengths of 8 cm. At the focus, System S's lateral
resolution is 3.0 mm, whereas System C's is 5.0 mm. Which system is most likely to
appropriately display two small body structures that lie, one in front of the other, at depths of
8.6 and 9.0 mm? - Answers Cannot be determined. No information on axial resolution.
The diameter of a disc-shaped, unfocused piezoelectric crystal is 1 cm. What is the best
estimate for the minimum lateral resolution of the ultrasound system? - Answers 5 mm.
The diameter of a disc-shaped, unfocused piezoelectric crystal is 1.2 cm. The near zone length
is 8 cm. What is the best estimate for the lateral resolution at a depth of 16 cm? - Answers 1.2
cm.
Which imaging modality places time-of-flight information on the x-axis and echo amplitude on
the y-axis? - Answers A-Mode.
Which imaging mode accurately displays reflector depth? - Answers A-Mode
Which imaging technique usually displays a single jagged line of varying heights? - Answers A-
Mode
With B-Mode, on which axis is the strength of the reflection input? - Answers z-axis
Which imaging modality places dots of dissimilar gray scale on the display? - Answers B-mode
The mode that produces lines related to the changing position of reflectors in the body with
respect to time is called __ - Answers M-mode
What does the x-axis of a B-Mode the y axis of an M-mode and the x-axis of an A-mode all relate?
- Answers Time of flight.
(With regard to mechanical transducers) True or false? The ultrasound beam is directed in many
different directions to create an imaging plane? - Answers True.
(With regard to mechanical transducers) True or false? The ultrasound beam is not focused
electronically. - Answers True.
(With regard to mechanical transducers) True or false? There is communication between the
pulser of the ultrasound system and the piezoelectric crystal of the transducer. - Answers True.
The transducer's PZT must be directly connected to the pulser electronics of the ultrasound
system.
