Directed Study Questions Module 5
Briefly describe the spin echo pulse sequence. The
conventional spin echo pulse sequence consist of a
90 RF pulse followed by one or more 180 re-phasing
pulses. Can produce both T1 wei
Running head: MRI SAFETY OVERVIEW
MRI Safety Overview
Luis Torres III
Adventist University of Health Sciences
June 5, 2016
MRI SAFETY OVERVIEW
Magnetic Resonance Imaging (MRI) has pote
MIV, USC SOM
LET US PROBE INSIDE THE
IT'S ALL ABOUT PHYSICS
Recall that molecules are made of atoms and
atoms have a standard structure.
Electrons are at the periphery and nucleus is in
The nucleus contains pr
1.1 Fundamental property of matter.
1.1.1 all substances possess some form of magnetism.
1.2 Magnetic domain
1.2.1 smallest region of magnetism
1.2.2 electron configuration determines its strength and number.
Name the three gradients used in MRI systems. X,Y, and Z
gradients. The X gradient alters the magnetic field strength
along the X- (horizontal) axis of the magnet; the Y gradient
alters the magnetic field strength along the Y- (vertical) axis
of the mag
Describe the three types of motion of an atom. Electrons
spinning on their own axis; electrons orbiting the nucleus;
the nucleus itself spinning about its own axis.
Explain how hydrogen the element of choice in clinical MRI. It
is used because hydroge
Static Magnetic Field Safety Concerns
Any metallic object with magnetic properties is bound to become a hazard as it will be
attracted to the magnetic field of the MR scanner. Sites are divided into four zones according to
the strength of the
Directed Study Questions Module 3
Describe signal and noise. Ratio of the MRI signal (voltage
induced in the receiver coil in the transverse plane) to its
background noise. Signal is cumulative can be altered and
Directed Study Questions Module 4
What are the main components of the MRI system?
Magnet- Large Magnet-Permanent. Secondary
Magnets- Shim coils, Magnetic field gradient system
used for spatial encoding
Spin Echo Pulse Sequences: Conventional spin echo, Fast spins echo, SS-FSE,
DRIVE, and inversion recovery.
1. Conventional Spin Echo
1.1 the conventional spin echo pulse sequence consist of a 90 RF
pulse followed by one or more 180 re-phasing pulses.