FREE SCIENCE AND STUDY GAMES ABOUT SONOGRAPHY

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FREE SCIENCE AND STUDY GAMES ABOUT SONOGRAPHY

PHYSICS EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -21 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: When a crystal is dampened, how many cycles are in a pulse?

Answer:

2-3 cycles Question 2: What is the mnemonic for the synonyms of axial resolution and what does it stand for.

Answer:

LARRD: longitudinal, axial, range, radial, depth

Question 3: What is resolution?

Answer:

The ability to image accurately

Question 4: What is the useful frequency range for ultrasound?

Answer:

2-15 MHz range

Question 5: What two things create shorter pulses that improve axial resolution?

Answer:

Less ringing (dampen the crystal), higher frequency

Question 6: What are the two types of detail resolution?

Answer:

axial and lateral resolution Question 7: With axial resolution, where do the structures lie in relation to the sound beam's main axis?

Answer:

The structures lie parallel to the sound beam's main axis one in front of the other Question 8: What is the relationship between axial resolution and spatial pulse length?

Answer:

Shorter pules: better axial resolution

Question 9: What are the equations for SPL?

Answer:

SPL = wavelength x # of cycles or

SPL = propagation speed/frequency x # of cyles

Question 10: How does a higher frequency improve axial resolution?

Answer:

higher frequencies = shorter wavelength (with set medium)= shorter pulse

Question 11: What are the units for axial resolution?

Answer:

mm, any unit of distance Question 12: What type of numeric value improves image accuracy for axial resolution?

Answer:

Low numeric value

Question 13: According to Kremkau, what is axial resolution and how does it run?

Answer:

It is the ability to produce 2 distinct structures and it runs "along scan line"

Question 14: What are the typical values of axial resolution?

Answer:

0.1-1.0mm Question 15: For best axial resolution, the pulse duration (PD) and SPL should by what?

Answer:

short Question 16: What happens when the frequency is less than 2MHz or more than 15MHz?

Answer:

less than 2MHz = not acceptable axial resolution

more than 15MHz = not enough penetration depth

Question 17: Can axial resolution be adjusted by the tech? Why or why not?

Answer:

no; because SPL is set by the TD

Question 18: What is the equation for axial resolution in soft tissue?

Answer:

axial resolution(mm)=0.77x #cycles in pulse / frequency (MHz)

Question 19: Axial resolution is determined by what?

Answer:

Spatial Pulse Length; medium and sound

Question 20: What is the equation for axial resolution?

Answer:

axial resolution(mm)=SPL(mm)/2 or

axial resolution(mm)=wavelength(mm)x #of cycles in pulse / 2

Question 21: What is Axial Resolution?

Answer:

The ability of a system to display two structures that are close together