Mock Test

Question 1

T2 weighted Flair sequences are typically used for evaluation of:

Answer 1

White Matter Disease

Question 2

Which field strength would require the shortest TI time to suppress the signal from fat when performing a STIR sequence in an MRI of the ankle?

Answer 2

Weakest field strength

Question 3

Which of the following sequences is the most insensitive to magnetic field inhomogeneity?

Answer 3

Spin Echo

Question 4

The extent to which a material or tissue becomes magnetized in an external magnetic fiels is called:

Answer 4

Magnetic susceptibility

Question 5

When imaging the female pelvis, the most optimal view for evaluation of the ovaries is the:

Answer 5

Coronal

Question 6

When imaging the female pelvis, the most optimal view for evaluation of the uterus is the:

Answer 6

Sagittal

Question 7

Reducing FOV will do what to SNR

Answer 7

Decreased FOV=Decreased SNR

Question 8

RF energy used in MRI is classified as:

Answer 8

low energy, non ionizing radiation

Question 9

If the flip angle is doubled, RF deposition increases by a factor of:

Answer 9

4

Question 10

_____ is when only half the views of k-space are fills in the frequency axis.

Answer 10

Partial or fractional echo

Question 11

A narrow receiver bandwidth does what to susceptibility artifact?

Answer 11

Increases susceptibility artifact

Question 12

The process that digitizes the MR signals is known as:

Answer 12

Fourier transform

Question 13

In the TMJs, the articular disc lies between what two anatomical structures?

Answer 13

Mandibular fossa and mandibular condyle

Question 14

If the third centricle is dilated, but the fourth ventricle is not, there would then be pathology associated with:

Answer 14

Aqueduct of Sylvius

Question 15

Which fissure divides the frontal and parietal lobes from the temporal lobes?

Answer 15

Sylvian Fissure

Question 16

The _____ runs the length of the falx cerebri.

Answer 16

Superior Sagittal Sinus

Question 17

In what orientation would a tear of the collateral ligaments of the knee be best visualized?

Answer 17

Coronal

Question 18

On a T2 weighted image, edema appears bright because it has a ____ relaxation time.

Answer 18

Long T2

Question 19

What protocol would be selected to rule out islet cell tumor?

Answer 19

Pancreas

Question 20

The common carotid artery bifurcates into the internal and external carotid artery at the level of the:

Answer 20

C3-4 disc space

Question 21

In order to acquire an intracranial arterial blood flow sequence, a presaturation pulse would be applied in which location?

Answer 21

Superior to slice group

Question 22

A major advantage of a 2D time of flight over a 3D tie of flight sequence is the ability to:

Answer 22

Image larger areas without saturation of flowing blood.

Question 23

Phase Contrast MRA techniques produce images in which the signal intensity within the vessel is dependent upon the:

Answer 23

Velocity of the flowing blood

Question 24

In a contrast enhanced MRA of the abdominal arteries, the IV gadolinium would enhance in which order?

Answer 24

Celiac, superior mesenteric, renal, inferior mesenteric

Question 25

The ligamentum flavum can be found in which part of the body?

Answer 25

Spine

Question 26

On a T1 weighted image of the spine, the CSF appears ____ to the spinal cord

Answer 26

hypointense

Question 27

In a cross sectional view of the MR magnet design, which coils are closest to the patient?

Answer 27

RF coils

Question 29

The purpose of shimming the magnet is to:

Answer 29

Make the B0 field as homogenous as possible

Question 30

Active shielding can be defined as:

Answer 30

Superconducting windings within the MR scanner, reducing the fringe magnetic field.

Question 31

____ could be used to line the walls and/or floors of the MR magnet room to feduce the fringe magnetic field, and is defined as ____ shielding.

Answer 31

Steel, passive

Question 32

Which magnetic field has been documents to cause muscle contractions, cardiac arrhythmias, mild cutaneous sensation and visual light flashes?

Answer 32

Time varying magnetic fields (Gradient)

Question 33

The gradient rise time is defined as:

Answer 33

Time it takes for the gradient to reach its full amplitude.

Question 34

The gradient slew rate is defined as:

Answer 34

The rate of speed of ascent or descent from zero to it maximum amplitude

Question 35

A technique utilized to reduce the MRI scan time which requires the use of an array coil is:

Answer 35

Parallel imaging

Question 36

Hemangiomas in the liver are typically benign lesions, and are best visualized with:

Answer 36

Delayed images

Question 37

The MRI system component that provides the ability to perform spatial encoding is the:

Answer 37

Gradient system

Question 38

When imaging the spine to rule out metastatic lesions of the spinal cord, contrast enhancement is used with T1 weighted images because:

Answer 38

Metastatic lesions enhance and normal cord does not.

Question 39

____ sequences are T1 gradient echoes with TR and FA selections to suppress signal from stationary tissues, visualizing flowing blood by flow related enhancement, whereas ____ sequences use T2 gradient echoes with parameter selections that suppress stationary tissue and rely on velocity-induced phase shifts for vascular signal.

Answer 39

TOF MRA, PC MRA

Question 40

What describes an EPI sequence? Hint: Train

Answer 40

A train of gradient echoes

Question 41

What best describes a FSE sequences? Hint: Train

Answer 41

A train of spin echoes

Question 42

Reducing the FOV by a factor of 2 will reduce the voxel volume by a factor of:

Answer 42

4

Question 43

Equation for Effective TR (R-R interval)

Answer 43

60,000 / Heart Rate = Effective TR (ms TR)

Question 44

Equation for Cardiac imaging time

Answer 44

Imaging time=R-R interval - (trigger window+trigger delay) (trigger window is percentage of R-R-interval)