Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Echo Boards > Physics and Instrumentation > Flashcards

Physics and Instrumentation Flashcards

1
Q

5 functions of a ultrasound receiver

A
  1. Amplification
  2. Compensation
  3. Compression
  4. Demodulation
  5. Rejection
    In that order
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Spatial Resolution: LARD stands for

A

longitudinal, axial, radial, range, and depth resolution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The length of a single pulse is called the _____ ______ _______

A

Spacial Pulse Length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Axial (or LARD) resolution is dependent on the 1/2 the _____ ______ _____

A

1/2 the spacial pulse length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Axial (or LARD) resolution occurs in which axis? (X / Y / Z)

A

Z-Axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Spatial Resolution: LATA stands for

A

Lateral, Angular, Transverse and Azimuthal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Lateral (or LATA) resolution occurs in which axis? (X / Y / Z)

A

X- Axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Elevation resolution occurs in which axis? (X / Y / Z)

A

Y-Axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The time required to complete one cycle is the __________

A

Period

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The length of a single cycle measured as a distance is called the __________

A

Wavelength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The amount of time it take to complete a single pulse is the ________ __________

A

Pulse duration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The Length of a single pulse is the _______ _________ _________

A

Spatial Pulse Length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The amount of TIME from the begining of one pulse to the begining of the next pulse is the ______ ______ ______

A

Pulse repetition period

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How is pulse repetition period related to pulse repetition frequency?

A

The inverse:
PRF = 1 / PRP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How is the Nyquist limit related to the pulse repetition frequency

A

Nyquist limit is 1/2 the PRF

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Pulse repetition frequency is important to what type of resolution?

A

Temporal resolution

17
Q

How is axial resolution related to spatial pulse length?

A

Axial resolution is 1/2 SPL

18
Q

The number of cycles per second is the __________

A

Frequency

19
Q

The _______ layer reduces reflection at the tissue/transducer interface

A

matching layer

20
Q

The maximum spatial peak temporal average intensity to avoid thermal injury for unfocused US beam is _______

A

1W/cm^2

21
Q

The maximum spatial peak temporal average intensity to avoid thermal injury for a FOCUSED US beam is _______

A

100mW/cm^2
=0.1W/cm^2

22
Q

Amplitude is plotted on the Y axis and depth on the X axis in (A/B/M/2-D)-Mode Ultrasound

A

A-Mode ultrasound

23
Q

Returning echos are plotted according to depth and amplitude with stronger echos appearing brighter in (A/B/M/2-D)-Mode Ultrasound

A

B-Mode ultrasound

24
Q

Amplitude of returning echos are plotted as brightness on the and graphed at their distance on the Y axis vs time on the X axis in (A/B/M/2-D)-Mode Ultrasound

A

M-Mode ultrasound

25
Q

(Density) * (Velocity) = ______ _______

A

(Z) Acoustic Impedance

26
Q

The backing material improves _______ _______ by decreasing spacial pulse length

A

Axial Resolution

27
Q

V/2T =

A

Resonant Frequency

28
Q

As bandwidth increases, quality factor (increases/decreases)

A

decreases

29
Q

Resonant Frequency / Bandwidth =

A

Quality Factor

30
Q

The fraction of time that the ultrasound crystal is producing a pulse is known as the ______ _______

A

Duty Factor

31
Q

Pulse Duration / Pulse Repetition Period

A

Duty Factor

32
Q

(Radius of the transducers face)^2 / Wavelength =

A

Focal length

33
Q

Damping material decreases the _______ _______ ________

A

Spacial pulse length

34
Q

What is the frequency of an ultrasound probe with a wavelength of 0.308mm?

A

5 MHz
Velocity = (Frequency) x (Wavelength)

35
Q

The ideal matching layer has a thickness _______ that of the wavelength

A

1/4

36
Q

The optimal thickness of the piezoelectric crystal is _______ that of the wavelength

A

1/2

Echo Boards (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions