Lesson 1a: Fluid Properties and Colour Doppler

Question 1

The ____ the pressure, the greater the flow rate

Answer 1

greater

Question 2

Volumetric Flow Rate = ____ / _____

Answer 2

Pressure (dyne) / Resistance (poise)

Question 3

If flow resistance increases, volumetric flow rate _____-

Answer 3

decreases

Question 4

Flow resistance depends on
1)
2)
3)

Answer 4

1) Fluid Viscosity
2) Tube length
3) Radius

Question 5

As tube length increases, flow resistance ____
As radius increases, flow resistance ____
If viscosity increases, flow resistance ___

Answer 5

Increases
decreases
increases

Question 6

This type of flow occurs at the entrance of a tube or vessel

Answer 6

Plug flow

Question 7

Streamlines are straight, parallel to each other

Answer 7

Laminar flow

Question 8

A form of laminar flow, when max velocity is in the centre and the average flow is half the max flow

Answer 8

Parabolic Laminar Flow

Question 9

Flow that is no longer parallel but still considered to be laminar, occurs when there is bifurcation

Answer 9

Disturbed flow

Question 10

Random, chaotic flow in all directions

Answer 10

Turbulent Flow

Question 11

As diameter of the stenosis increases, flow speed increases to maintain flow. What rule is this?

Answer 11

Continuity Rule

Question 12

As flow speed in the stenosis increases, pressure ____

Answer 12

decreases

Question 13

The stacking of RBC’s is known as _____ Effect

Answer 13

Rouleaux

Question 14

Conditions that cause Rouleaux formation include
1)
2)
3)
4)
5)

Answer 14

1) Multiple Myeloma
2) Infection/ Inflammation
3) Waldenstrom’s Macroglobulinemia
4) Diabetes Mellitus
5) Cancers

Question 15

Poiseuille’s Equation calculates

Answer 15

Volumetric Flow rate

Question 16

Bernouille’s Equation calculates

Answer 16

Pressure change

Question 17

Doppler Effect is the change in ___ caused by the motion of sound source

Answer 17

Frequency

Question 18

Propagation speed of sound through tissue is _____

Answer 18

1540 m/s

Question 19

Doppler shift is the change in ____ caused by motion

Answer 19

Frequency

Question 20

Doppler Shift is proportional to
1)
2)

Answer 20

1) Speed of blood flow
2) Operating Frequency

Question 21

The angle between the direction of blood flow, and the sound propogation direction, is called the __________ or _________ angle

Answer 21

Insonification or Isonation

Question 22

While Doppler Angle increases, Doppler Shift Frequency ________

Answer 22

Decreases

Question 23

When the COSINE of the Doppler angle increases, Doppler Shift Frequency _______

Answer 23

Increases