DMS 104 Test 4 2026 – Advanced Sonography Physics and Imaging Assessment
Study Guide
Calculate the near field length of a transducer with a diameter of 5 mm and a wavelength
of .0002m. - correct answer ✔✔ 0.031m
Which prefix equals 10^-3? - correct answer ✔✔ mili
What type of resolution is determined by the beam width in an elevation plane? - correct
answer ✔✔ Elevation
Which of the following is the least popular way to focus a transducer? - correct answer ✔✔
Mirrors
Piezoelectric elements are dipole - correct answer ✔✔ True
If crystal thickness doubles what happens to the frequency of operation for pulsed wave mode?
- correct answer ✔✔ Halves
Lateral resolution is the ability to distinguish two separate objects along (parallel) the sound
beam - correct answer ✔✔ False
The thickness of the crystal is equal to - correct answer ✔✔ 1/2 of the wavelength
Changing the transmit frequency has no affect on the Doppler shift frequency - correct answer
✔✔ False
If PD decreases what happens to PRP? - correct answer ✔✔ Remains the same
, Crystal thickness is equal to - correct answer ✔✔ 1/2 of the wavelength
Beam width is related to - correct answer ✔✔ Crystal diameter
The best doppler shift is achieved when the transducer is perpendicular to the vessel - correct
answer ✔✔ False
Calculate the NFL of a transducer with a diameter of 5 mm and a wavelength of 0.0002 m -
correct answer ✔✔ .031 m
PRP is the reciprocal of: - correct answer ✔✔ PRF
The Fraunhofer zone is the only region where the beam diameter exceeds the transducer
diameter - correct answer ✔✔ True
Increased crystal thickness results in increased frequncy - correct answer ✔✔ False
Far field divergence______ with increasing frequency - correct answer ✔✔ Decreases
How far can ultrasound travel in air in 5 seconds? - correct answer ✔✔ 1650 m
The far field is also referred to as: - correct answer ✔✔ The fraunhofer zone
The average speed of ultrasound in air is - correct answer ✔✔ 330 m/s
Study Guide
Calculate the near field length of a transducer with a diameter of 5 mm and a wavelength
of .0002m. - correct answer ✔✔ 0.031m
Which prefix equals 10^-3? - correct answer ✔✔ mili
What type of resolution is determined by the beam width in an elevation plane? - correct
answer ✔✔ Elevation
Which of the following is the least popular way to focus a transducer? - correct answer ✔✔
Mirrors
Piezoelectric elements are dipole - correct answer ✔✔ True
If crystal thickness doubles what happens to the frequency of operation for pulsed wave mode?
- correct answer ✔✔ Halves
Lateral resolution is the ability to distinguish two separate objects along (parallel) the sound
beam - correct answer ✔✔ False
The thickness of the crystal is equal to - correct answer ✔✔ 1/2 of the wavelength
Changing the transmit frequency has no affect on the Doppler shift frequency - correct answer
✔✔ False
If PD decreases what happens to PRP? - correct answer ✔✔ Remains the same
, Crystal thickness is equal to - correct answer ✔✔ 1/2 of the wavelength
Beam width is related to - correct answer ✔✔ Crystal diameter
The best doppler shift is achieved when the transducer is perpendicular to the vessel - correct
answer ✔✔ False
Calculate the NFL of a transducer with a diameter of 5 mm and a wavelength of 0.0002 m -
correct answer ✔✔ .031 m
PRP is the reciprocal of: - correct answer ✔✔ PRF
The Fraunhofer zone is the only region where the beam diameter exceeds the transducer
diameter - correct answer ✔✔ True
Increased crystal thickness results in increased frequncy - correct answer ✔✔ False
Far field divergence______ with increasing frequency - correct answer ✔✔ Decreases
How far can ultrasound travel in air in 5 seconds? - correct answer ✔✔ 1650 m
The far field is also referred to as: - correct answer ✔✔ The fraunhofer zone
The average speed of ultrasound in air is - correct answer ✔✔ 330 m/s
