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Flashcards in Board review 1 Deck (146)
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1

Positive Doppler shift

Reflector is moving creating an angle >90 b/w flow and transmitted beam

2

Time gain compensation helps with?

Attenuation

3

Increase strengh of transmitted beam with?

Power control

4

Increase strength of received signal with?

Gain control

5

Is there ever a gap b/w adjacent pixels?

No

6

Inverse of frame rate

Temporal resolution

7

Adjusts the dynamic range of echoes

Compression control

8

Relationship b/w frequency and depth

Higher frequency, smaller depth

9

What does increased frequency do to spatial resolution?

Increases spatial resolution

10

Relationship b/w depth and frame rate?

Decrease depth = higher frame rate

11

?Sector angle, does what to frame rate?

?Frame rate (less stuff to image)

12

displays a power spectrum of velocities over time (over a single scan line, like M-mode)

Spectral Doppler

13

Mosaic patern on color doppler indicates?

Turbulence

14

Speed of ultrasound in tissue

1540 m/s

15

Maneuvers to distinguish LV thrombus from artifact

Inc transducer frequency

16

What to do with mechanical index to decrease contrast bubble destruction?

Decrease

17

Which leaflets of TV are seen in apical 4C?

Anterior and septal

18

When making chamber measurements, which one is smaller: 2D or M-mode?

2D

19

What is only view to see posterior leaflet of TV?

RV inflow

20

With tissue doppler, what do u do to receiver gain and wall filters to get velocities?

Decrease receiver gain

21

220/PHT = ?

MVA

22

CW or PW to get pressure half time?

CW

23

Cont. eq'n for AVA

(LVOT diameter)2 x .785 x TVI LVOT/ TVI AV

24

What mean gradient is c/w severe MS?

>10mmHg

25

If u want to inow flow at a specific location, do u use CW or PW?

PW

26

On CW, which valve disorder varies the jet height w/ respiration ?

TR

27

Is TVI directly proportional to SV (stroke vol)

Yes

28

What % change in SV w/ dobutamine is needed to have contractility reserve?

20% (20% increase in TVI)

29

PHT= ? x DT

? = .29

30

Why would a pt with mild AR have a short PHT (implying sev AR)?

LV diastolic dysfunction