Magnetism in MRI

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What is magnetic inhomogeneity expressed in?

Parts per million (ppm)
How many Gauss are in 1 T?

10,000 G
What does Faraday's Law of induction state?

A changing magnetic field will induce a voltage
What are the most commonly used systems?

Superconducting magnet systems
Ferromagnetic means

iron and iron like substances that can generate a relatively strong magnetic field
Paramagnetic means

Have a very weak magnetic field
Gadolinium is considered to be ______

Paramagnetic
Diamagnetic means

Have no magnetic field
What are examples of ferromagnetic substances?

Stainless steel, Iron, Nickel
What is magnetic susceptibility?

the extent to which a material or tissue becomes magnetized in an external magnetic field
What is magnetic permeability?

How well a material attracts the imaginary lines of the magnetic field
What is accomplished with iron shielding?

The magnetic field will not extend out into the adjacent rooms
Protons that are parallel to magnetic field are _____ energy

low
Protons that align anti-parallel to the magnetic field are _____energy

high
Hydrogen protons that are spin down are ____
energy

high
What is the Net Magnetization Vector?

The excess number of hydrogen protons aligned with the static magnetic field
A Free induction decay (FID) is produced from a ______

RF pulse
During one T1 relaxation time how much longitudinal magnetization is recovered?

63%
What is T2 relaxation time?

the time it takes for 63% of the Transverse magnetization to decay
T2 relaxation is also called

Spin spin relaxation
What component provides the ability to perform spatial encoding?

Gradient system

Author:	hrmckensey1015
ID:	308573
Card Set:	Magnetism in MRI
Updated:	2015-09-26 18:52:55
Tags:	magnetism mr
Folders:	MRI
Description:	magnetism in MRI
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