MRI Physics Review

Which MRA technique measures transverse magnetization T2 between moving and stationary nuclei?

Phased Array Coils utilize _______ receivers.

Which of the following terms refers to phase ghosting artifact caused by flowing nuclei.

Shimming can be accomplished ______.

Faraday's law of induction states if a loop of wire moves through a magnetic field, it creates

Signal outside the FOV is mapped inside the fov is called?

The cause of a zipper artefact?

The body coil located inside the bore is a ___?

In cardiac gating, the TR depends on which of the following

Which artefact produces replication of moving anatomy across the image in the phase direction?

Which of the following helps to assist with CNR?

Which of the following is used to achieve black blood imaging?

To evaluate arterial flow in TOF, you should put a pre sat in the direction of arterial flow.

The translation motion of water molecules in any direction on a cellular level is called ___.

A ray is passed through a volume of data to create a 3D rendering this is ____?

What imaging option is used in Bright Blood imaging to enhance signal from blood and CSF?

Flowing nuclei in the slice for the excitation may have exited before rephasing. This is called

In Cine imaging the number of data point is:

The homogeneity of an MR scanner is maximized through a process known as _____.

A decrease in TE does which of the following?

Decreasing receiver bandwidth:

Stationary tissue becomes saturated and flowing nuclei are fresh produce which phenomenon?

2d TOF is good for imaging slow flow, where as 3d is good for fast flow.

How to determine pixel size?

What is the difference between pixels and voxels?

In DWI imaging, ADC maps are used to compensate for with artefact.

Used to compare the chemical composition of normal tissue to abnormal tissue.

Interleaving is when alternate slices are excited and divided into two acquisitions to decrease

Which to the following factors does not affect spatial resolution?

Increasing phase encoding steps will:

How much of an increase in SNR by using Quadrature coils?

The term slew rate refers to the __ of the gradient magnetic field.

In slice acquisition in cardiac gating, the available scan time is:

White matter is anisotropic and gray matter is isotropic.

Suspectibiltiy artifact can be reduced by

Advantage of increased echo train length is a decrease in scan time, but a disadvantage of:

An increase in slice thickness will do which of the following?

Pulses that nullify singal from flowing nuclei before they enter the FOV?

How to correct for Gibbs artefact?

Fat precesses at a lower frequency than water with a higher field strength magnet can cause:

Flow at different velocities that fluctuates randomly is__?

Pre saturation pulses are used to

Spatial resolution can be increased by____?

Flow artefact can be reduced by:

What determines the number of pixels in the FOV?

Which of the following units is used to measure homogenity?

Which of the following is not a remedy to reduce phase mismapping?

Arterial flow on an axial brain scanned foot to head is ____.

Which gradient slope produces the receiver bandwidth?

A decrease in voxel volume leads to a decrease in:

Which of these will assist with CNR in an image to view pathology?

Which of the following is a form of Magnetic Resonance Angiography imaging?

Flowing nuclei is out of phase w/ stationary causes a reduction of signal amplitude in voxel

Undersampling of data causes a low intensity band though a high intensity area is called

If the ETL in a FSE is 8, how many lines of Kspace is filled with each TR?

Which MRA technique uses VENC?

Frequency that exist randomly in space and time is ____?

An increase in FOV or a decrease in matrix by a factor of 2, yields a ____ increase in SNR.

For RF coils to work in MR, the B1 fields needs to be __ to the Bo field.

What is the formula for calculating scan time for a spin echo?

The micro-circulation of the delivery of blood to tissue is called:

The percentage of time that the gradient is permitted to work.

Exploits the differences in magnetic suspectibility in oxhemoglobin and deoxyhemoglobin is ___?

A 1.5t magnet is equivalent to:

The term rise time refers to the ___ of the gradient magnetic field.

A TOF technique to decrease Venetian blind artefact?

Increasing NEX do which of the following?

Artefact where fat and water are out of phase and cancel each other out?

Which material has a small magnetic moment?

Passive magnetic shielding uses ___ to confine the fringe field?