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.
- A.
True
- B.
False
- 2.MRI techniques to enable vascular visualization of vessels include all of the following except:
- A.
Subtraction techniques (acquired during systole and diastole – then subtracted) to allow for visualization of vascular structures
- B.
Gradient echo sequences with gradient moment nulling (for bright blood)
- C.
Spin echo acquisitions with spatial pre-saturation (for black blood)
- D.
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
- A.
True
- B.
False
- 4.MRA techniques to visualize blood include all of the following except:
- A.
TOF-MRA
- B.
Digital subtraction MRA
- C.
CE-MRA
- D.
TSE
- E.
PC-MRA
- 5.Since flowing blood appears the same on various types of pulse sequences, conventional MRI can by used to evaluate vascular structures.
- A.
True
- B.
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
- A.
True
- B.
False
- 7.The options to increase contrast between vessels and surrounding tissue are done by exploiting __________ enhancement.
- A.
Flow-related
- B.
Vessel
- C.
Tissue
- D.
Contrast
- 8.If patient has a fast rate, the RR interval is longer than if patient has slow heart rate.
- A.
True
- B.
False
- 9.COW sequences are usually associated with low velocity blood flow?
- A.
True
- B.
False
- 10.In black blood imaging, spin echo sequences are improved by SAT pulses, which ________ the signal from in-flowing blood.
- A.
Increases
- B.
Changes
- C.
Reduces
- D.
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.
- A.
True
- B.
False
- 12.MOTSA improves coverage and maintains signal from blood flowing within larger volume. MOTSA
- A.
Multiple Oversampling Thin Section Angiography
- B.
Multiple Overlapping Thick Section Angiography
- C.
Multiple Overlapping Thin Section Angiography
- D.
Multiple Overstepping Thin Section Angiography
- 13.Black Blood Imaging is also as known as?
- A.
Phase contrast signal loss
- B.
Hypo-intense signal loss
- C.
Time of flight signal loss
- D.
Hyper-intense signal loss
- 14.MRA techniques utilize different phenomena to increase signal from flowing spins. This are _______________? (select all that apply)
- A.
PC-MRA
- B.
Triple IR
- C.
TOF-MRA
- D.
CE-MRA
- E.
DS-MRA
- 15.If patient’s heart rate is 120 beats per minute, then the R to R interval is?
- A.
1000ms
- B.
1500ms
- C.
100ms
- D.
500ms
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