1|Page | © copyright Master01| Grade A+
ARDMS SPI STUDY GUIDE Questions
and Answers (100% Pass)
In soft tissue, if the frequency of a wave is increased the Propagation Speed
(PS) will...
✓ Remain the Same because stiffness and density affect Propagation
Speed.
What is the audible range?
✓ 20-20,000Hz
✓
✓ >20,000Hz=Ultrasound
Frequency is measured in
Master01 |Excellent Study Material| Latest update
, 1|Page | © copyright Master01| Grade A+
✓ Hertz (Hz)
✓ is
✓ Cycles per Second
✓
✓ Not affected by sonographer
✓
✓ Increase Frequency; Decrease Depth
A period is the length of time it takes for
✓ one complete wavelength to pass a fixed point
PRP is determined by
✓ Transmit time and receive time.
Period is measured in
✓ Time (μs)
When the sonographer changes the imaging depth what parameters are
changed?
Master01 |Excellent Study Material| Latest update
, 1|Page | © copyright Master01| Grade A+
✓ PRP, PRF, Duty Factor
What is duty factor?
✓ The percentage or fraction of time that the system is transmitting a
pulse (Time Sound is ON or ON-Time).
Propagation Speed in SOFT TISSUE
✓ 1.54 mm/μs
✓ (1540 m/sec)
Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period
✓ Time, (μs)
Pulse duration is determined by
✓ Sound Source Only
Pulse Duration is controlled by
✓ the ultrasound system and transducer
Pulse Duration Formula
Master01 |Excellent Study Material| Latest update
, 1|Page | © copyright Master01| Grade A+
✓ pulse duration (μs) = # cycles in pulse/frequency(MHz)
✓
✓ PD= Number of cycles in Pulse/ Frequency(Hz)
Spatial Pulse Length (SPL) (measurement)
✓ The distance that a pulse occupies in space from the start to the end
of a pulse.
✓ (mm)
Typical values for spatial pulse length in soft tissue.
✓ 0.1 to 1.0 mm
Spatial pulse length is determined by
✓ sound source and medium
Spatial Pulse Length is directly proportional to
Master01 |Excellent Study Material| Latest update
ARDMS SPI STUDY GUIDE Questions
and Answers (100% Pass)
In soft tissue, if the frequency of a wave is increased the Propagation Speed
(PS) will...
✓ Remain the Same because stiffness and density affect Propagation
Speed.
What is the audible range?
✓ 20-20,000Hz
✓
✓ >20,000Hz=Ultrasound
Frequency is measured in
Master01 |Excellent Study Material| Latest update
, 1|Page | © copyright Master01| Grade A+
✓ Hertz (Hz)
✓ is
✓ Cycles per Second
✓
✓ Not affected by sonographer
✓
✓ Increase Frequency; Decrease Depth
A period is the length of time it takes for
✓ one complete wavelength to pass a fixed point
PRP is determined by
✓ Transmit time and receive time.
Period is measured in
✓ Time (μs)
When the sonographer changes the imaging depth what parameters are
changed?
Master01 |Excellent Study Material| Latest update
, 1|Page | © copyright Master01| Grade A+
✓ PRP, PRF, Duty Factor
What is duty factor?
✓ The percentage or fraction of time that the system is transmitting a
pulse (Time Sound is ON or ON-Time).
Propagation Speed in SOFT TISSUE
✓ 1.54 mm/μs
✓ (1540 m/sec)
Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period
✓ Time, (μs)
Pulse duration is determined by
✓ Sound Source Only
Pulse Duration is controlled by
✓ the ultrasound system and transducer
Pulse Duration Formula
Master01 |Excellent Study Material| Latest update
, 1|Page | © copyright Master01| Grade A+
✓ pulse duration (μs) = # cycles in pulse/frequency(MHz)
✓
✓ PD= Number of cycles in Pulse/ Frequency(Hz)
Spatial Pulse Length (SPL) (measurement)
✓ The distance that a pulse occupies in space from the start to the end
of a pulse.
✓ (mm)
Typical values for spatial pulse length in soft tissue.
✓ 0.1 to 1.0 mm
Spatial pulse length is determined by
✓ sound source and medium
Spatial Pulse Length is directly proportional to
Master01 |Excellent Study Material| Latest update
