Meaning of Anechoic? Correct Answer: Dark, less echos.
Meaning of Echogenic? Correct Answer: Full of echoes.
Meaning of Hyperechoic? Correct Answer: More echoes than adjacent tissue.
Meaning of Hypoechoic? Correct Answer: Less Echoes than adjacent tissue.
Meaning of Isoechoic? Corre...
Definition of Density? Correct Answer: Concentration of matter.
-Inversely related to prop speed.
Definition of Stiffness aka "Bulk Modulus"? Correct Answer: The resistance of a
medium to compression.
-Stiffness is directly proportional to speed.
What are the two types of Ultrasound Waves? Correct Answer: 1.)
Electromagnetic - Wave travels through a vacuum.
2.) Mechanical - Wave must travel through a medium.
,What are two kinds of Mechanical Waves? Correct Answer: A.) Transverse
B.) Longitudinal
Ultrasound images are made up of typically how many scan lines? Correct
Answer: 128 - 256 scan lines.
(more the better resolution)
Scanning format for Sector (shape)? Correct Answer: Pie Shaped, Scan lines
originate from the same location and spread out as they travel.
.
/\
/\
Scanning format for Modified Sector? Correct Answer: Scan lines originate from
different points, but close together.
///\\\
/// \\\
Scanning format for Linear? Correct Answer: Scan lines originate from different
points and travel parallel to each other. |||||||
|||||||
Definition of PRF? Correct Answer: -Pulse Repetition Frequency
-The number of cycles per second. (including listening time)
Units for PRF? Correct Answer: Hz, kHz, MHz
Formula for PRF? Correct Answer: PRP=__1__
PRF
Definition of PRP? Correct Answer: -Pulsed Repetition Period
-The time from the beginning of one pulse to the beginning of the next pulse.
Units for PRP? Correct Answer: s, ms, microseconds
Formula for PRP? Correct Answer: PRP=__1__
PRF
Definition of Pulse Duration? Correct Answer: The time the pulse is on.
, Unit for Pulse Duration? Correct Answer: Microseconds
Formula for Pulse Duration? Correct Answer: PD = n x T
Definition of SPL? Correct Answer: -Spatial Pulse Length
-The length of one pulse
Unit for SPL? Correct Answer: mm
Formula for SPL? Correct Answer: SPL = n x (lamda) aka Wavelength
Definition of Duty Factor? Correct Answer: The percentage of time the pulse is on
-Unitless (just a number)
-For continuous wave, duty factor = 100%
-For pulsed wave, Duty Factor is less than 1%
Formula for Duty Factor? Correct Answer: DF = __PD__
PRP
Definition for Bandwidth? Correct Answer: The range of frequencies found in a
pulse.
-The shorter the pulse, more frequencies.
Definition for Fractional Bandwidth? Correct Answer: Describes how large BW is
compared to frequency
-Unitless
Formula for Fractional Bandwidth? Correct Answer: FBW = __BW__ (BW =
bandwidth)
Fo (Fo = Operating Frequency)
Definition for Quality Factor? Correct Answer: Way to rate a transducer, Quality
of the transducer.
-The lower the QF, the better transducer.
Formula for Quality Factor? Correct Answer: QF = __Fo__
BW
Definition of Power? Correct Answer: The rate that work is performed.
-The rate of energy transfer
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 Classroom. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.49. You're not tied to anything after your purchase.
