Exam (elaborations)
PHYSICS SPI EXAM ACTUAL QUESTIONS AND ANSWERS 100% CORRECT | UPDATED
- Course
- Institution
PHYSICS SPI EXAM ACTUAL QUESTIONS AND ANSWERS 100% CORRECT | UPDATED
[Show more]
Content preview
PHYSICS SPI EXAM ACTUAL QUESTIONS ANDANSWERS 100% CORRECT | UPDATED 2024-2025
When sound hits a boundary between two media of the same propagation speed
at oblique incidence: - ANSWER no refraction will occur.
Refraction requires the oblique incidence of sound across a boundary between
two media with different propagation speeds.
As transducer frequency increases: - ANSWER axial and lateral resolution will
increase
Blood flow volume changes in the body are mainly controlled by what two
factors? - ANSWER cardiac function and peripheral resistance
When referring to blood flow volume throughout the body, the best answer to the
question is cardiac function and vessel resistance.
Potential bioeffects of ultrasound can be minimized by which of the following? -
ANSWER reduce exam time
Reducing overall exam time will reduce patient exposure. Adhering to the ALARA
principle will also reduce exposure by limiting power output adjustments and
using TGC controls instead. The other choices have no effect on intensity.
Which of the following types of resolution varies with different depths on the
image? - ANSWER lateral resolution
,Lateral resolution is improved at the focal zone and in the near field compared to
the far field.
Transmit Delay or Receive Focusing improves _____________________
resolution. - ANSWER angular and azimuthal
Azimuthal and angular resolution refer to lateral resolution. Lateral resolution is
improved with a thinner beam. Focusing forms a thinner beam in the focal zone,
therefore focusing improves the lateral resolution.
Which of the following is NOT adjustable by the Sonographer? - ANSWER
Demodulation
Demodulation occurs as the signal is converted into positive voltages
(rectification) and smoothed across the peaks of the voltage pulses. This process
assists in processing the voltages for proper image display of the returned signals.
This is a preset function of the US system and not operator adjustable.
To obtain a longer near zone: - ANSWER change from a 3MHz to a 6MHz
transducer.
Higher frequency and larger element diameter probes provide the longest near
zones.
The matching layer for a transducer is usually made of plastic and is approximately
________________ . - ANSWER 1/4 of the probe wavelength in thickness
, The matching layer for a transducer is usually made of plastic and is approximately
1/4 of the probe wavelength in thickness.
Lateral resolution is best at what location in the beam? - ANSWER focal point
If the ultrasound image is too black and white, which of the following will add
more levels
of grey to the image? - ANSWER decrease rejection levels
Rejection is used to reduce the amount of low level echoes displayed on the
image. If the image is too black and white, reducing the rejection level will allow
more low level echoes to be displayed on the image. This will decrease the black
and white appearance and increase the levels of grey displayed.
_______________ is defined as the time it takes to complete one cycle. -
ANSWER Period
Period is defined as the time it takes to complete one cycle.
The ability to differentiate a hyperechoic hemangioma within the hypoechoic liver
tissue is due to what type of image resolution? - ANSWER contrast resolution
Contrast resolution refers to the ability to differentiate different intensities
(shades of black, white and grey) on the ultrasound image. Compression can be
used to alter the dynamic range of the image which affects the contrast. Lower
compression = larger dynamic range = improved contrast resolution = lower image
contrast = more shades of gray on the image
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller StudySet. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78998 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now