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Flashcards in MRI 5 Deck (12)
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1

Repetition Time (TR)

The time interval between successive excitation pulses, usually expressed in seconds.

2

Echo Time (TE)

The time interval between an excitation pulse and data acquisition, usually expressed in milliseconds.

3

Static contrast

Contrast mechanisms that are sensitive to the type, number, relaxation properties, and local environment of spins (i.e. T1, T2, proton density).

4

T1-Weighted Images

Images that provide information about the relative T1 values of tissue; also known as T1 images.

5

T2-Weighted Image

Images that provide information about the relative T2 values of tissue; also known as T2 images.

6

T2*-Weighted Images

Images that provide information about the relative T2* values of tissue; also known as T2* images.

7

Chemical Shift Imaging

A technique for measuring the concentration of particular chemicals, based on subtle differences in the resonance of the protons they contain.

8

Magnetization Transfer

An MR imaging technique that uses an off-resonance excitation pulse to saturate the MR signal from large molecules; the subsequent influence of that pulse upon free protons in water indicates the concentration of those large molecules.

9

MRA

The creation of images of the vascular system using MRI.

10

Diffusion

The random motion of molecules through a medium over time.

11

Diffusion Weighting

The application of magnetic gradients to cause changes in the MR signal that are dependent on the amplitude and/or direction of diffusion.

12

Perfusion

Blood flow through tissue.