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'Tip Angle'
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Searchterm '
Tip Angle
' was also found in the following service:
News (
1
)
Tip Angle
Angle between the
net magnetization vector
before and after a RF
excitation
pulse. Small
tip angle
s allow a decrease in TR, which is used to decrease
scan time
in
Field Echo
pulse
sequences
. See
Flip Angle
.
•
Share the entry '
Tip Angle
':
Further Reading:
Basics:
Mapping of low flip angles in magnetic resonance
(.pdf)
Saturday, 1 January 2011
by
www.hal.inserm.fr
MRI Resources
Veterinary MRI
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Societies
Small
Tip Angle
Gradient Echo
(STAGE) A
gradient echo sequence
with low flip angles and spoiled gradients.
See
Spoiled Gradient Echo Sequence
.
•
View the DATABASE results for '
Small Tip Angle Gradient Echo
' (3).
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Small
Tip Angle
Gradient Echo T1 Weighted
(STAGE T1W) A RF spoiled
T1 weighted
gradient echo sequence
.
See
Spoiled Gradient Echo Sequence
.
Searchterm '
Tip Angle
' was also found in the following service:
News (
1
)
Flip Angle
(FA) The flip angle
a
is used to define the angle of
excitation
for a
field echo
pulse sequence
. It is the angle to which the net
magnetization
is rotated or tipped relative to the main
magnetic field
direction via the application of a RF
excitation
pulse at the
Larmor frequency
. It is also referred to as the
tip angle
,
nutation
angle or angle of
nutation
.
The
radio frequency
power (which is proportional to the square of the
amplitude
) of the pulse is proportional to
a
through which the spins are tilted under its influence. Flip angles between 0° and 90° are typically used in
gradient echo
sequences
, 90° and a series of 180° pulses in
spin echo
sequences
and an initial 180° pulse followed by a 90° and a 180° pulse in
inversion recovery
sequences
.
•
View the DATABASE results for '
Flip Angle
' (37).
•
View the NEWS results for '
Flip Angle
' (1).
Further Reading:
Basics:
What MRI Sequences Produce the Highest Specific Absorption Rate (SAR), and Is There Something We Should Be Doing to Reduce the SAR During Standard Examinations?
Thursday, 16 April 2015
by
www.ajronline.org
Mapping of low flip angles in magnetic resonance
(.pdf)
Saturday, 1 January 2011
by
www.hal.inserm.fr
News & More:
A practical guideline for T1 reconstruction from various flip angles in MRI
Saturday, 1 October 2016
by
journals.sagepub.com
Clinical evaluation of a speed optimized T2 weighted fast spin echo sequence at 3.0 T using variable flip angle refocusing, half-Fourier acquisition and parallel imaging
Wednesday, 25 October 2006
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Crystallography
Spoiled Gradient Echo Sequence
Spoiled
gradient echo
sequences
use a spoiler
gradient
on the
slice select
axis during the end module to destroy any remaining
transverse magnetization
after the
readout gradient
, which is the case for short repetition times.
As a result, only z-magnetization remains during a subsequent
excitation
. This types of
sequences
use semi-random changes in the
phase
of
radio frequency
pulses to produce a spatially independent
phase shift
.
Companies use different
acronyms
to describe certain techniques.
Different terms for these
gradient echo
pulse sequences:
CE-FFE-T1
Contrast Enhanced Fast Field Echo with T1 Weighting
,
GFE
Gradient Field Echo
,
FLASH
Fast Low Angle Shot
,
PS
Partial Saturation
,
RF spoiled FAST
RF Spoiled Fourier Acquired Steady State Technique
,
RSSARGE
Radio Frequency Spoiled Steady State Acquisition Rewound Gradient Echo
S-GRE
Spoiled
Gradient Echo
,
SHORT
Short Repetition Techniques
,
SPGR
Spoiled Gradient Recalled
(spoiled
GRASS
),
STAGE T1W
T1 weighted
Small
Tip Angle
Gradient Echo
,
T1-FAST
T1 weighted
Fourier Acquired Steady State
Technique,
T1-FFE
T1 weighted
Fast Field Echo
.
In this context, 'contrast enhanced' refers to the
pulse sequence
, it does not mean enhancement with a
contrast
agent.
•
View the DATABASE results for '
Spoiled Gradient Echo Sequence
' (11).
Further Reading:
News & More:
3-D VOLUMETRIC IMAGING FOR STEREOTACTIC LESIONAL AND DEEP BRAIN STIMULATION SURGERY
Cutting Edge Imaging of THE Spine
February 2007
by
www.pubmedcentral.nih.gov
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