Physics 2 Quiz 4.1

1. Peripheral Gating uses a photo-sensor attached to the patient's finger to detect the increase in blood volume in the capillaries.

True

False

2. MRI techniques to enable vascular visualization of vessels include all of the following except:

Subtraction techniques (acquired during systole and diastole – then subtracted) to allow for visualization of vascular structures

Gradient echo sequences with gradient moment nulling (for bright blood)

Spin echo acquisitions with spatial pre-saturation (for black blood)

Inversion recovery techniques for visualization of vessels when fat or water is suppressed

3. Inversion recovery techniques for visualization of vessels when fat or water is suppressed

True

False

4. MRA techniques to visualize blood include all of the following except:

TOF-MRA

Digital subtraction MRA

CE-MRA

TSE

PC-MRA

5. Since flowing blood appears the same on various types of pulse sequences, conventional MRI can by used to evaluate vascular structures.

True

False

6. In an attempt to acquire images with high spatial resolution in acceptable imaging times, CE-MRA's are acquired with fast, 3D T2 gradient sequences during breath-hold, or dynamically during contrast administration

True

False

7. The options to increase contrast between vessels and surrounding tissue are done by exploiting __________ enhancement.

Flow-related

Vessel

Tissue

Contrast

8. If patient has a fast rate, the RR interval is longer than if patient has slow heart rate.

True

False

9. COW sequences are usually associated with low velocity blood flow?

True

False

10. In black blood imaging, spin echo sequences are improved by SAT pulses, which ________ the signal from in-flowing blood.

Increases

Changes

Reduces

Doesn't change

11. If heart rate speeds up so that R wave occurs while the system is still acquiring data, the R wave is missed and the effective TR shortens.

True

False

12. MOTSA improves coverage and maintains signal from blood flowing within larger volume. MOTSA

Multiple Oversampling Thin Section Angiography

Multiple Overlapping Thick Section Angiography

Multiple Overlapping Thin Section Angiography

Multiple Overstepping Thin Section Angiography

13. Black Blood Imaging is also as known as?

Phase contrast signal loss

Hypo-intense signal loss

Time of flight signal loss

Hyper-intense signal loss

14. MRA techniques utilize different phenomena to increase signal from flowing spins. This are _______________? (select all that apply)

PC-MRA

Triple IR

TOF-MRA

CE-MRA

DS-MRA

Submit

15. If patient's heart rate is 120 beats per minute, then the R to R interval is?

1000ms

1500ms

100ms

500ms