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ARDMS Ultrasound Physics & Instrumentation Practice Exam, Exams of Medical Physics

University of Rio GrandeMedical Physics

A practice exam for the ardms (american registry for diagnostic medical sonography) ultrasound physics & instrumentation exam. It contains a series of multiple-choice questions and answers covering various topics related to ultrasound physics and instrumentation, such as pulse duration, density, frequency, propagation speed, refraction, attenuation, resolution, and transducer technology. The exam seems to be designed to test the candidate's understanding of the fundamental principles and concepts in this field, which are essential for performing diagnostic ultrasound examinations. The document could be useful for students or professionals preparing for the ardms ultrasound physics & instrumentation exam, as it provides a comprehensive review of the key topics and allows them to practice their knowledge and problem-solving skills.

Typology: Exams

2023/2024

Available from 08/12/2024

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ARDMS Ultrasound Physics & Instrumentation
Practice Exam | 2024 Questions & Answers |
100% Correct | Verified
Which of the following is defined as only the active time? - ✔✔Pulse duration
The inertia of the medium describes its: - ✔✔Density
Which of the following is determined by the sound source only? - ✔✔Frequency
The prefix "centi" denotes: - ✔✔Hundredths
If the angle of incidence is 40°, what is the angle of transmission at the interface if medium 1 has a
propagation speed of 1320 m/s and medium 2 has a propagation speed of 1700 m/s? - ✔✔>40°
The change in the direction of the original sound wave that occurs when sound interacts with two
different tissue types that have a different propagation speed is referred to as: - ✔✔Refraction
Refraction is the change in direction of the transmitted sound beam that occurs with oblique incidence
and dissimilar propagation speeds.
Which of the following is an appropriate unit of measurement for propagation speed? - ✔✔millimeters
per microsecond (mm/μs)
The major component of attenuation is: - ✔✔Pulse repetition frequency
In clinical imaging, the wavelength measures between: - ✔✔0.1 to 0.8 mm
The duty factor for continuous wave ultrasound is: - ✔✔100%
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ARDMS Ultrasound Physics & Instrumentation

Practice Exam | 2024 Questions & Answers |

100% Correct | Verified

Which of the following is defined as only the active time? - ✔✔Pulse duration The inertia of the medium describes its: - ✔✔Density Which of the following is determined by the sound source only? - ✔✔Frequency The prefix "centi" denotes: - ✔✔Hundredths If the angle of incidence is 40°, what is the angle of transmission at the interface if medium 1 has a propagation speed of 1320 m/s and medium 2 has a propagation speed of 1700 m/s? - ✔✔>40° The change in the direction of the original sound wave that occurs when sound interacts with two different tissue types that have a different propagation speed is referred to as: - ✔✔Refraction Refraction is the change in direction of the transmitted sound beam that occurs with oblique incidence and dissimilar propagation speeds. Which of the following is an appropriate unit of measurement for propagation speed? - ✔✔millimeters per microsecond (mm/μs) The major component of attenuation is: - ✔✔Pulse repetition frequency In clinical imaging, the wavelength measures between: - ✔✔0.1 to 0.8 mm The duty factor for continuous wave ultrasound is: - ✔✔100%

All of the following relate to the strength of the sound wave except: - ✔✔Wavelength What is the change in intensity if the power decreases by half? - ✔✔Intensity is halved Damping of the sound beam: - ✔✔Reduces the spatial pulse length What is defined as the ability of the ultrasound system to image structures that are positioned parallel to the sound beam as separate structures? - ✔✔Axial resolution What is defined as the beginning of one pulse to the beginning of the next pulse, and therefore includes both the "on" and "off" time? - ✔✔Pulse repetition period The pulse repetition period is the time from the start of one pulse to the start of the next pulse, and therefore, it includes the "on" (or transmit) and "off" (or listening) times What is pressure measured in? - ✔✔pascals or pounds per square inch What is essentially equal to the power of a wave divided by the area over which the power is distributed? - ✔✔Intensity Transducers have material within them that, when electronically stimulated, produces ultrasound waves. This is most likely some form of: - ✔✔Lead zirconate titanate What is the change in power if the amplitude triples? - ✔✔It increases nine times What is defined as the beginning of one pulse to the beginning of the next pulse, and therefore includes both the "on" and "off" time? - ✔✔Rarefaction Rarefaction is an area in the sound wave where the molecules are spread wider apart.

The typical range of frequency for diagnostic ultrasound imaging is: - ✔✔1 to 20 MHz The attenuation coefficient in soft tissue is equal to: - ✔✔One half of the operating frequency Micro denotes: - ✔✔Millionth Which of the following is described as the distance over which one cycle occurs? - ✔✔Wavelength Wavelength is distance over which one cycle occurs, or the distance from the beginning of one cycle to the end of the same cycle. All of the following are true of stiffness except: - ✔✔Stiffness and propagation speed are indirectly associated Stiffness and propagation speed are directly related: the stiffer the medium, the faster the propagation speed. Areas of high pressure and density are referred to as: - ✔✔Compressions Spatial pulse length can be calculated by: - ✔✔Multiplying the number of cycles times the wavelength Density is typically measured in: - ✔✔Kilograms per centimeter cubed As a sound wave travels through the human body, the intensity of the sound wave decreases as a result of: - ✔✔Attenuation Absorption Scattering

Attenuation is a decrease in the amplitude, power, and intensity of the sound beam as sound travels through tissue. There are three mechanisms of attenuation: absorption, reflection, and scattering. What is the total amount of attenuation that occurs if a 6.0-MHz sound beam travels through 4 cm of soft tissue? - ✔✔12 dB As imaging depth increases, pulse repetition period: - ✔✔Increases If pulse repetition frequency increases, then the duty factor: - ✔✔Increases The percentage of time that the ultrasound system is producing pulses of ultrasound describes the: - ✔✔Duty factor Density and propagation speed are: - ✔✔Inversely related All of the following are true of power except: - ✔✔As amplitude increases, power remains the same All of the following are true of wavelength except: - ✔✔It is equal to the period divided by the frequency Which of the following is determined by the sound source and medium? - ✔✔Wavelength Which of the following is defined as the number of ultrasound pulses emitted in 1 second? - ✔✔Pulse repetition frequency