Chapter 20 Transcranial Doppler

Question 1

What frequency with pulsed Doppler is used

Answer 1

2 MHz

Question 2

What angle of insonation is used

Answer 2

0

Question 3

Name the 3 acoustic windows used

Answer 3

1) transtemporal
2) transorbital
3) transforaminal/suboccipital

Question 4

Accurate vessel identification requires what 4 things

Answer 4

1) depth of sample volume
2) velocity of blood flow
3) direction of blood flow
4) relationship of flow patterns to one another

Question 5

Unilateral trans temporal approach is used to evaluate

Answer 5

1) MCA
2) ACA
3) PCA
4) terminal ICA

Question 6

Ipsilateral transorbital approach is used to evaluate

Answer 6

1) ophthalmic artery
2) carotid siphon

Question 7

Transforaminal/ suboccipital approach is used to evaluate

Answer 7

1) intracranial vertebral
2) basilar arteries

Question 8

For the MCA
window:
Depth:
Direction
Velocity
Angle

Answer 8

Window- transtemporal
Depth- 30-60 mm
Direction- antegrade toward the probe
Velocity- TAMV: 55
Mean: 12 cm/sec
Angle- anterior and superior

Question 9

For the terminal ICA what are the following

Window
Depth
Direction
Velocity
Angle

Answer 9

Window- transtemporal
Depth- 55-65 mm
Direction- bi directional
Velocity- TAMV: 55
Mean: 12 cm/sec
Angle- anterior and superior

Question 10

For the ACA name the following

Window
Depth
Direction
Velocity
Angle

Answer 10

Window- transtemporal
Depth- 60-80 mm
Direction- retrograde away from probe
Velocity- TAMV: 50
Mean: 11 cm/sec
Angle- anterior and superior

Question 11

For the PCA name the following

Window
Depth
Direction
Velocity
Angle

Answer 11

Window- transtemporal
Depth- 60-70 mm
Direction- antegrade
Velocity- TAMV: 39
Mean: 10 cm/sec
Angle- posterior

Question 12

For the ICA at the siphon name the following

Window
Depth
Directions
Velocity
Angle

Answer 12

Window- transorbital
Depth- 60-80 mm
Direction- parasellar: antegrade
Supraclinoid: retrograde
Genu: both
Velocity- TAMV: 47
Mean: 14
Angle- varies

Question 13

At the ophthalmic artery name the following

Window
Depth
Direction
Velocity
Angle

Answer 13

Window- transorbital
Depth- 40-60 mm
Direction- antegrade
Velocity- TAMV: 21
Mean: 5 cm/sec
Angle- medial

Question 14

For the vertebral arteries name the following

Window
Depth
Direction
Velocity
Angle

Answer 14

Window- transforaminal
Depth- 60-90 mm
Direction- retrograde
Velocity- TAMV: 38
Mean: 10 cm/sec
Angle- right and left of midline

Question 15

For the basilar arteries name the following

Window
Depth
Direction
Velocity
Angle

Answer 15

Window- transforaminal
Depth- 80-120 mm
Direction- retrograde
Velocity- TAMV: 41
Mean: 10 cm/sec
Angle- midline

Question 16

Occlusion is most accurate in

Answer 16

ICA or MCA

Question 17

Vasospasm is most accurate in the

Answer 17

MCA

Question 18

Vasospasm mean velocities are

Answer 18

> 120 cm/sec

Question 19

Severe Vasospasm is

Answer 19

> 200 cm/sec

Question 20

_____________ ____________ have increased systolic and diastolic flow velocities, very low pulsatility indices, and reduced flow in adjacent arteries

Answer 20

Arteriovenous malformation

Question 21

Which testing device would be most useful in evaluation of arterial Vasospasm following subarachnoid hemorrhage

A) CW Doppler
B) OPG-Gee
C) periorbital Doppler
D) transcranial Doppler

Answer 21

D) transcranial Doppler