What can be done to reduce the Mechanical Index level during an exam?
A. reduce output power
B. decrease probe frequency
C. increase the threshold
... [Show More] setting
D. use contrast materials on the exam
A.) reduce output power
All of the following statements are true regarding equipment preparation for beginning an ultrasound exam, except?
A. In order to reduce exam time, the proper exam preset must be used for each exam.
B. Adjust the height of the chair to allow your wrist to be fully extended while scanning.
C. A medical record number must be used to identify the patient on the ultrasound system.
D. Always place the cord around your neck or shoulder to avoid dragging the cord across open sores, wounds or ulcers during the exam.
D.) Always place the cord around your neck or shoulder to avoid dragging the cord across open sores, wounds or ulcers during the exam.
. Which of the following parameters cannot be evaluated by the AIUM test object?
A. azimuthal resolution
B. depth calibration
C. gray scale
D. distance calibration
C.) gray scale
If you set the gain to the lowest level and slowly increase it until an echo is identified on the image, what are you evaluating on the US system?
A. dead zone
B. spatial resolution
C. minimum sensitivity
D. registration accuracy
C.) minimum sensativity
How do the microbubbles in an ultrasound contrast agent change the image?
A. microbubbles cannot be used to evaluate arterial flow due to embolism risk
B. increase vasodilation to move the bubbles more quickly so they are visible to ultrasound
C. increase the reflectivity of flowing blood
D. increase the resistance to flowing blood to make it more visible
B.) increase vasodilation to move the bubbles more quickly so they are visible to ultrasound
What effect will a mechanical index of 1.0 have on a contrast exam?
A. An MI setting of 1.0 or greater is preferred for contrast exams.
B. The decreased beam intensity will reduce the appearance of the bubbles on the image.
C. The increased beam intensity will burst the contrast bubbles quickly.
D. Mechanical index has no effect on contrast exams. The thermal index must be properly set for an optimal contrast exam.
C.) The increased beam intensity will burst the contrast bubbles quickly
The Doppler shift is:
A. the amount of movement of blood flow that occurs each second
B. the difference between the speed of sound and the speed of the blood flow
C. the difference between the velocity of sound and the velocity of the blood flow
D. the difference between the transmitted frequency and the reflected frequency.
D.) the difference between the transmitted frequency and the reflected frequency
All of the following are AIUM recommendations regarding the use of ultrasound, except:
A. In order to limit ultrasound intensity, always use PW Doppler instead of M-mode to evaluate the fetal heart
B. Always adhere to the ALARA principle when scanning
C. Limit ultrasound exposure to patients that require an examination for a specific reason
D. Limit the examination time to the shortest time necessary to complete a diagnostic exam
A.) In order to limit ultrasound intensity, always use PW Doppler instead of M-mode to evaluate the fetal heart
The acoustic power is increased by 3dB. The beam intensity ____________________.
A. is multiplied by 3
B. doubles
C. is multiplied by 4
D. decreases by half
B.) doubles
The half intensity depth (HID) is defined as:
A. is not affected by Rayleigh scatter
B. the depth where the beam intensity is 50% of the transmitted intensity
C. the depth where aliasing first occurs for PW Doppler
D. is not affected by reflection
B.) the depth where the beam intensity is 50% of the transmitted intensity
Elastography is used in breast imaging to determine the relative _______________ of a mass.
A. amount of through transmission
B. stiffness
C. compression
D. amount of reflection
B.) stiffness
. When using a tissue phantom to evaluate range accuracy, what unit will be used to report the measurement?
A. decibel
B. millisecond
C. micrometer
D. centimeter
D.) centimeter
The ALARA principle describes:
A. the formula for calculation of the right atrial area
B. the rule of thumb for adjusting gain before output power to minimize ultrasound exposure
C. the formula for using PISA to obtain MR grade
D. the recommendations for universal precaution use
B.) the rule of thumb for adjusting gain before output power to minimize ultrasound exposure
All of the following are used as contrast agents in US, except:
A. perfluorocarbon based contrast
B. gas filled bubbles
C. agitated saline bubbles
D. agitated iodine bubbles
D.) agitated iodine bubbles
As you are scanning an obese abdominal patient, you notice a 0.7 Thermal Index. What should be done next?
A. Take a break from scanning the patient for 30-60 seconds and then start again while monitoring the TI level.
B. Stop the exam and consult the radiologist regarding increased patient exposure.
C. Reduce the number of images obtained to significantly reduce exam time.
D. Continue scanning and complete the full exam efficiently to reduce exposure time.
D.) Continue scanning and complete the full exam efficiently to reduce exposure time.
. What is the expected appearance of a malignancy on elastography evaluation?
A. deep blue throughout the area that contains the mass
B. clear with no demonstration of color over the area that contains the mass
C. clear with demonstration of yellow coloring over the area that contains the mass
D. malignant masses demonstrate no deformability
D.) malignant masses demonstrate no deformability
Which of the following lists the normal range of intensities used in diagnostic Doppler US?
A. 100 - 1000 mW/cm2
B. 100 - 1000 mW/cm
C. 0.2 - 400 mW/cm2
D. 0.2 - 400 W/cm
C.) 0.2 - 400 mW/cm2 [Show Less]