a.) Pulses of sound are used for ultrasound imaging. b.) Short, wider pulses improve resolution, or image quality. c.) Ultrasound has a frequency greater than 20kHz. d.) Intensity decreases as sound travels through the body.
You said: b). Short, wider pulses improve resolution, or image quality.
Correct! Choices A through C are discussed from the beginning of the tutorial through the section on resolution. See: Resolution
a.) Spatial Pulse Length b.) Piezoelectric Effect c.) Attenuation d.) Doppler Shift
You said: c). Attenuation
Correct! Absorption, reflection and scattering are discussed in the "Echoes" section. See: Echoes
a.) Sound travels at the same speed, regardless of the medium. b.) Sound can not travel in a vacuum. c.) The effect sound has on tissue is called the biological effect. d.) Frequency is the only difference between audible sound and ultrasound.
You said: a). Sound travels at the same speed, regardless of the medium.
Correct! Study from the beginning of the tutorial through the review points that follow amplitude and intensity. See: Types of sound
a.) Preferred Reflection Frequency b.) Processed Recevied Frequency c.) Pulsed Received Frequency d.) Pulse Repetition Frequency
You said: d). Pulse Repetition Frequency
Correct! Study the "Types of Sound" section, specially pulsed ultrasound. See: Types of sound
a.) Determine the frame rate b.) Determine the strength of the reflector c.) Obtain blood flow information displayed on the spectral analysis d.) Identify acoustical impedance
You said: c). Obtain blood flow information displayed on the spectral analysis
Correct! Review the section on Doppler Ultrasond See: Doppler
a.) They contain multiple elements or crystals arranged in various patterns. b.) The elements must be made of piezoelectric materials. c.) It is acceptable to sterilize imaging transducers using high heat. d.) The elements are stationary and steering is accomplished by changing the firing patterns of the elements.
You said: c). It is acceptable to sterilize imaging transducers using high heat.
Correct! Review the section on transducers. See: Transducers
a.) Temporal b.) Axial c.) Contrast d.) Spatial
You said: d). Spatial
Correct! Review the section on resolution. See: Resolution
a.) Fan shaped or blunted sector b.) Rectangular c.) Pie or sector shaped d.) Rectangular top with sector sides
You said: a). Fan shaped or blunted sector
Correct! Review the section on transducers, specially "scanhead footprints". See: Transducers
a.) Spatial Pulse Length b.) Attenuation c.) Nyquist Limit d.) Intensity
You said: d). Intensity
Correct! Choices A through D are contained in different portions of the tutorial. The correct answer is discussed in the section on intensity. See: Amplitude & Intensity
a.) The Doppler shift occurs b.) The PRF decreases c.) An echo or reflection is produced d.) All the sound is absorbed
You said: c). An echo or reflection is produced
Correct! Review the "Echoes" section See: Echoes
a.) Determines the pulse repetition frequency b.) Steers and focuses the beam c.) Activates the elements d.) Restricts the "ringing" ability of the elements
You said: d). Restricts the "ringing" ability of the elements
Correct! Review the section on transducers. See: Transducers
a.) The diameter of the element b.) The thickness of the element c.) The number of elements d.) The arrangement of the elements
You said: b). The thickness of the element
Correct! Review the section on transducers See: Transducers
a.) Mechanical b.) Linear Phased c.) Vector d.) Convex
You said: a). Mechanical
Correct! Review the section on transducers See: Transducers
a.) Doppler equation b.) Doppler effect c.) Nyquist limit d.) alias artifact.
You said: d). alias artifact.
Incorrect! Review the section on Doppler. See: Doppler
a.) Curved-linear b.) Linear c.) Vector d.) Phased
You said: a). Curved-linear
Correct! Review the section on scanhead footprints. See: Transducers
a.) Can measure extremely high velocities b.) Uses two crystals inside the housing c.) No Nyquist Limit d.) Can identify the exact location of the velocity data
You said: d). Can identify the exact location of the velocity data
Correct! Review the section on Doppler See: Doppler
a.) Color Map b.) Pixel Board c.) Spectral Analysis d.) Aliasing
You said: a). Color Map
Incorrect! Review the section on Doppler See: Doppler
a.) Pulser b.) Display c.) Beamformer d.) Memory
You said: d). Memory
Correct! Review the section on instrumentation See: Instrumentation
a.) 50 b.) 30 c.) 80 d.) 70
You said: c). 80
Correct! Review the "Echoes" section. See: Echoes
a.) Missing b.) Improperly located c.) Mirror Images d.) Too bright
You said: c). Mirror Images
Incorrect! Review the section on artifacts See: Resolution
a.) Longitudinal b.) Temporal c.) Contrast d.) Spatial
You said: d). Spatial
Incorrect! Review the section on resolution and instrumentation. See: Resolution
a.) Doppler shifts are measured from multiple locations along multiple scan lines b.) Velocity information is displayed as colors c.) Color flow imaging uses pulsed techniques and is subject to aliasing d.) Velocity information is obtained from one point at a predetermined depth
You said: a). Doppler shifts are measured from multiple locations along multiple scan lines
Incorrect! Review the section on Doppler and color Doppler. See: Color Flow Imaging
a.) Receiver b.) Beamformer c.) Pulser d.) Digital Scan Converter
You said: a). Receiver
Incorrect! Review the section on instrumentation. See: Instrumentation
a.) Thyroid b.) Abdominal Aorta c.) Fetal Abdomen d.) Abdominal Mass
You said: a). Thyroid
Correct! Review the "Echoes" section. See: Transducers
a.) Mirror Image b.) Refraction c.) Shadowing d.) Multipath
You said: c). Shadowing
Correct! Review the section on artifacts. See: Artifacts
a.) Motion mode b.) Brightness mode c.) Amplitude mode d.) B-mode
You said: c). Amplitude mode
Incorrect! Review the "Display" section. See: Display
a.) Frequency, period, and wavelength are terms used to describe CW sound. b.) Continous wave sound has no velocity limitations. c.) CW sound is used to create images in diagnostic ultrasound. d.) The sound is on all the time.
You said: c). CW sound is used to create images in diagnostic ultrasound.
Correct! Review the section on "Types of Sound". See: Types of sound
a.) Refraction b.) Multipath c.) Acoustic Enhancement d.) Section Thickness
You said: d). Section Thickness
Correct! Review the section on artifacts. See: Artifacts
a.) Reflections are produced b.) The sound travels in a straight line c.) The molecules in the medium physically vibrate d.) Sound can travel in a vacuum
You said: c). The molecules in the medium physically vibrate
Correct! Review the "Principle of Sound" section. See: Principles of Sound
a.) Duty Factor b.) Pulse Duration c.) Pulse Repetition Period d.) Pulse Repetition Frequency
You said: b). Pulse Duration
Incorrect! Review Pulsed Ultrasound Terminology See: Types of sound |