MRI Quiz Flashcards
All of the following artifacts except ________ occur along the PHASE encoding axis
chemical shift (occurs along the FREQUENCY encoding axis)
Magnetic susceptibility artifacts are more prominent with _____________ sequences
Gradient Echo
A remedy for a Gibbs truncation artifact would be:
increase the number of phase encodings or reduce the FOV (while maintaining matrix)
The largest ventricle in the heart is ________?
Left ventricle
Calculate the effective TR for a patient with a heart rate of 70 beats per minute
857 ms
The height of a peak on an MR spectrum correlates to the ________ of a substance that was detected
to the AMOUNT of a substance that was detected
Contrast in DWI (Diffusion Weighted Imaging) depends on
1) The degree to which molecular mobility is impaired (water restriction)
2) The sensitivity of the sequence to Brownian motion
3) T1 relaxation time
4) The direction of water diffusion
5) T2 relaxation time
1 , 2 and 4
The final result in a perfusion study is
A set of calculated images which indicate various flow characteristics
The final result in a spectroscopy study is _______
A spectrum of specific detected metabolites
The imaging technique that employs a very rapid pulse sequence while the patient is at rest or performing a task is:
Functional MRI
If the TR in a gradient echo sequence is less than the T2 (or T2*), the resulting condition is known as:
Steady state
A gradient echo sequence in which all the remaining residual transverse magnetization is removed prior to the next excitation pulse is known as:
Incoherent or Spoiled
In a Fast Spin Echo (FSE) sequence, acquired with a long TE, yielding T2 weighted images, scan time can be reduced by:
Using longer ETL
In a Fast Spin Echo (FSE) sequence, acquired with a short echo time (TE), yielding T1 or PD weighted images, blurring can be reduced by:
Using shorter ETL
The structures that comprise the rotator cuff in the shoulder are:
1. Deltoid muscle
2. Subscapularis muscle and tendon
3. Infraspinatus muscle and tendon
4. Teres minor muscle and tendon
5. Supraspinatus muscle and tendon
6. Trapezius muscle and tendon
2, 3, 4 and 5
T2 weighted FLAIR (fluid attenuated inversion recovery) sequences are typically used for evaluation of:
White matter disease
Short TAU inversion recovery (STIR) sequences are typically used for the evaluation of all the following EXCEPT:
Fluid (CSF - Cerebrospinal Fluid)
When a gradient echo sequence is selected for fast, breath hold dynamic contrast-enhanced imaging of the abdomen, is utilized.
Spoiling
Gradient echo sequences requiring high signal from fluid are known as all of the following EXCEPT:
Incoherent gradient echo
Dynamic enhanced MRA sequences of the mesenteric arteries are performed using:
Incoherent gradient echo
