This document discusses various MRI sequences. It describes spin echo sequences, inversion recovery sequences, gradient echo sequences, and echo planar imaging. Free induction decay is discussed as a short-lived signal appearing after a 90 degree RF pulse that does not contribute to image formation. Parameters, modifications, and uses of different sequences are outlined.
this power-point slide presentation includes lots of information like how MRI coil works. what is shimming, magnet, fringe, and design of mri coil and also magnet. this will help a lot for radiologist and technician radiographers.. thanks.
A pulse sequence is a sequence of events, which are
needed to acquire MRI images. These events are: RF
pulses, gradient switches and signal collecting.
this power-point slide presentation includes lots of information like how MRI coil works. what is shimming, magnet, fringe, and design of mri coil and also magnet. this will help a lot for radiologist and technician radiographers.. thanks.
A pulse sequence is a sequence of events, which are
needed to acquire MRI images. These events are: RF
pulses, gradient switches and signal collecting.
MRI spin echo sequences are a fundamental imaging technique in magnetic resonance imaging (MRI). They work by manipulating the spin of hydrogen nuclei in the body's tissues to create detailed images. In a spin echo sequence: Spin echo sequences are versatile and used in various MRI applications, including anatomical imaging, quantitative measurements, and lesion characterization. They can produce T1-weighted and T2-weighted images, depending on the specific sequence parameters chosen, offering valuable diagnostic information in medical imaging.
The gradient echo pulse sequence is the simplest type of MRI sequence.
The major purposes behind the gradient technique is a significant reduction in scan time. Small variable flip angle are employed , usually less than 90 degrees. which in turn allow very short repetition time thus decreasing the scan time.
Gradient echo pulse sequence differ from spin echo pulse sequence . There is no 180 degree pulse in GRE. T2 relaxation in GRE is called as T2* relaxation. Gradient can be used to either dephase or rephase the magnetic moments of nuclei.
A pulse sequence is a sequence of events, which we need to acquire MRI images.
Basic pulse sequences
1. Spin echo sequence(SE)
2. Gradient echo sequence(GRE)
3. Inversion Recovery Sequence(IR)
4. Echo Planar Imaging(EPI)
Mri spin echo pulse sequences its variations andYashawant Yadav
MRI spin echo pulse sequences its variation and applications , in this slide collection principle of spine echo pulse sequences is described with physic behind it ,, this slide also coves the inverse recovery pulse sequences and types ,,,, image weighting and parameters are explained .. hope it may be help ful.
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Medical imaging technique is well advanced today and we are measuring signals from protons level in MRI imaging. But we left behind a error in 2-D measurement in digital X- ray in imaging. This we found out during imaging of Scanogram. In this presentation we are explaining that how we are controlling this error by applying small trick for given plane interest on the digital X-ray Scanogram image.
The prostate is an exocrine gland of the male mammalian reproductive system
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A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
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TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
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Prix Galien International 2024 Forum ProgramLevi Shapiro
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These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
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3. MRI sequence is order to combination of RF and
gradient pulse designed to acquire the data to form the
image.
Timing,order,polarity & repetition frequency of
RF pulse and applied magnetic field gradients
7. Free induction decay (FID) refers a short-lived sinusoidal
electromagnetic signal which appears immediately
following the 90° pulse
8. It is induced in the receiver coil by the rotating component of the
magnetization vector in the x-y plane which crosses the coil loops
perpendicularly
11. FREE INDUCTION DECAY
Free induction decay (FID) refers a short-lived
sinusoidal electromagnetic signal which appears
immediately following the 90° pulse.
It is induced in the receiver coil by the rotating
component of the magnetization vector in the x-y
plane which crosses the coil loops perpendicularly.
This sinusoidal signal decays exponentially with a time
constant of T2*.
It does not contribute to form MR image.
12. SPIN ECHO SEQUENCE
It consists of 90 and 180degree RF pulse
The excitatory 90 degree Rf pulse flips net
magnetization vector along z axis and due to non
homogeneity strat dephasing
By giving 180 degree pulse they strat rephasing to
bring protons back into the phase
This rephasing increase magnitude of TM and stronger
signal is induces in the receiver coil
21. PARAMETERS
• Short TR(300-800ms)
• Short TE(15-45ms)
T1-
anatomy
• Long TR(1000-2000ms)
• Long TE(90-140ms)
T2-
pathology
• Long TR(1000-3000ms)
• Short TE(15ms)PD
23. DUAL SPIN ECHO SEQUENCE
Two 180 degree pulse are sent after each 90 degree
pulse to obtain dual echoes per TR.
PD+T2 double echo sequence is an example of this
modified SE sequence.
It is run with longTR.
After the first 180 degree pulse, since TE is short,
image will be proton density weighted (Long TR,
shortTE).
Next 180degree pulse, TE will be long giving T2
weighted image (LongTR, LongTE).
25. FAST (TURBO) SPIN ECHO
In fast SE sequence we are giving multiple 180 degree
rephasing pulses are sent after each 90 degree pulse.
In these sequence multiple echos are obtained per TR
once echo with each 180 degree pulse.
All echos are used to fill a single k-space.
Since k-space is filled much faster with multiple echos
in a single TR the scanning speed is increases
considerablly.
Reduce phase encoding and spatial resolution.
26.
27.
28. Generally speaking contrast in fast spin echo is similar
to spin echo and used in
Muscoloskeletal regions
Central nervous system
pelvis
29. SINGLE SHOT FAST SPIN ECHO
Scan time is much reduced in SS-FSE than fast spin
echo
All lines of k-space is filled in one TR
SS-FSE combines a partial fourier technique
Half of lines acquired in one TR and other half are
transposed
31. INVERSION RECOVERY SEQUENCE
In this sequence we are giving first 180 degree pulse.
Second we are giving 90 degree pulse followed by
180degrees.
After that are we are taking signal.
TI- time of inversion is the time between first 180
degree pulse and 90 degree pulse.
36. STIR
Fat has a short TI i.e. 80-150ms.
So fat can be suppressed at the STIR sequence.
This sequence can be used with T1 or T2W images.
Mainly used in body imaging.
38. FLAIR
The aim of FLAIR sequence is to suppress liquid
signals, mainly in the brain .
Water has a long TI.
Nulling of water signal is seen at TI of 2000-2400ms.
Heavily T2W image is obtained.
USES
Neuro
imaging
Post
contrast
image
41. GRADIENT ECHO SEQUENCE
There is no 180 degree pulse in gradient echo
sequence.
Rephasing of TM in GRE is done by gradients;
particularly by reversal of the frequency encoding
gradient.
Since rephasing by gradient gives good signal.
49. ADVANTAGE OF GRES
Faster than spin echo because of short TRs and Tes
Shows flowing blood as bright good for MRI
Good for functional MRI
Good for subtle hemorrhage (micro hemorrhage
technique or magnetic susceptibility technique)
Micro calcification present in the brain also image well
by using susceptibility technique
Can be combined with spin echo to produce very fast
image
50. ECHO PLANAR IMAGING
Scanning time can be reduced by filling multiple line
of k-space in a single TR.
All the lines of k=-space required to form an image are
filled in a single TR.
Since entire 2D raw data ser (a plane of data or echo)
could be filled in single echo decay.
Slice acquired in 100ms thus minimizing the effect of
patient motion.
It is a dynamic image.
51. Advances in gradient and digital data acquisition technology
have made it possible to obtain individual MR slices in the time
frame of 50-100 ms, thus minimizing the effects of patient
motion. It gives good dynamic imaging protocol .
Echo-planar imaging (EPI).