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Result : Searchterm 'Pulse Sequence' found in 5 terms [] and 166 definitions []
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Spin Echo Imaging
 
MR imaging technique in which the spin echo is used rather than the FID. The proper selection of the echo and repetition time of the pulse sequence can help to control the amount of T1 or T2 contrast present in the image. Spin echo imaging can be used to create images that depend strongly on T2 if TE has a value on the order of or greater than T2 of the relevant image details. The spin echoes can be produced as a train of multiple echoes, e.g. using the CPMG pulse sequence.
See also Spin Echo Sequence.
 
Images, Movies, Sliders:
 Lumbar Spine T1 SE Sagittal  Open this link in a new window
    

Courtesy of  Robert R. Edelman
 MRI Orbita T1  Open this link in a new window
    
 
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Ultrasound  (1) Open this link in a new window
Spin Echo Multi SliceInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - Sequences -
 
(SEMS) This pulse sequence is composed of a 90° RF pulse followed by a 180° refocusing pulse. Both RF pulses are applied in the presence of a slice select gradient.
By choosing of different TR and TE, depending on the T1 and T2 values of the tissues, proton density, T1 weighted and T2 weighted images can be acquired.
The inversion recovery option enlarge the RF pulses with a 180° inverting pulse, applied a TI time before the beginning of the pulse sequence in order to manipulate image contrast.
See also Spin Echo Sequence.
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Further Reading:
  Basics:
Fast Spin Echo(.pdf)
Tuesday, 24 January 2006   by www.81bones.net    
MRI Resources 
Breast Implant - Quality Advice - Spine MRI - Spectroscopy - Breast MRI - Implant and Prosthesis
 
Spine MRIMRI Resource Directory:
 - Spine MRI -
 
Magnetic resonance imaging (MRI) of the spine is a noninvasive procedure to evaluate different types of tissue, including the spinal cord, vertebral disks and spaces between the vertebrae through which the nerves travel, as well as distinguish healthy tissue from diseased tissue.
The cervical, thoracic and lumbar spine MRI should be scanned in individual sections. The scan protocol parameter like e.g. the field of view (FOV), slice thickness and matrix are usually different for cervical, thoracic and lumbar spine MRI, but the method is similar. The standard views in the basic spinal MRI scan to create detailed slices (cross sections) are sagittal T1 weighted and T2 weighted images over the whole body part, and transverse (e.g. multi angle oblique) over the region of interest with different pulse sequences according to the result of the sagittal slices. Additional views or different types of pulse sequences like fat suppression, fluid attenuation inversion recovery (FLAIR) or diffusion weighted imaging are created dependent on the indication.
Indications:
Neurological deficit, evidence of radiculopathy, cauda equina compression
Primary tumors or drop metastases
Infection/inflammatory disease, multiple sclerosis
Postoperative evaluation of lumbar spine: disk vs. scar
Evaluation of syrinx
Localized back pain with no radiculopathy (leg pain)

Contrast enhanced MRI techniques delineate infections vs. malignancies, show a syrinx cavity and support to differentiate the postoperative conditions. After surgery for disk disease, significant fibrosis can occur in the spine. This scarring can mimic residual disk herniation. Magnetic resonance myelography evaluates spinal stenosis and various intervertebral discs can be imaged with multi angle oblique techniques. Cine series can be used to show true range of motion studies of parts of the spine. Advanced open MRI devices are developed to perform positional scans in the position of pain or symptom (e.g. Upright™ MRI formerly Stand-Up MRI).
 
Images, Movies, Sliders:
 Anatomic Imaging of the Lumbar Spine  Open this link in a new window
      

Courtesy of  Robert R. Edelman

 
Radiology-tip.comBone Densitometry,  Myelography
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• View the DATABASE results for 'Spine MRI' (11).Open this link in a new window


• View the NEWS results for 'Spine MRI' (4).Open this link in a new window.
 
Further Reading:
  Basics:
Newer Sequences for Spinal MR Imaging: Smorgasbord or Succotash of Acronyms?
   by www.ajnr.org    
Cutting Edge Imaging of THE Spine
February 2007   by www.pubmedcentral.nih.gov    
Landmark Independent Study by UCLA School of Medicine Reports Comparison of Dynamic™ Upright® MRI With Static Upright MRI in More Than 1,000 Patients (1,302):
Thursday, 15 November 2007   by www.fonar.com    
  News & More:
Discriminating imaging findings of acute osteoporotic vertebral fracture: a prospective multicenter cohort study
Thursday, 9 October 2014   by 7thspace.com    
Lumbar spine MRI limited in diagnosing ankylosing spondylitis
Friday, 7 March 2014   by www.healio.com    
MRI Of The Spine Identifies Smoldering Myeloma Patients At High Risk Of Progressing To Multiple Myeloma
Tuesday, 26 August 2014   by www.myelomabeacon.com    
Intensive training of young tennis players causes spinal damage
Wednesday, 18 July 2007   by www.eurekalert.org    
Imaging Technique for Spinal Cord Injury Shows Promise
Sunday, 22 December 2013   by www.wauwatosanow.com    
Searchterm 'Pulse Sequence' was also found in the following services: 
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Spoiled Gradient Echo SequenceInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - Sequences -
 
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.
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• View the DATABASE results for 'Spoiled Gradient Echo Sequence' (11).Open this link in a new window

 
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    
Searchterm 'Pulse Sequence' was also found in the following service: 
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Ultrasound  (1) Open this link in a new window
T1 Weighted ImageInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.
 
The basis of T1 weighted imaging is the longitudinal relaxation. A T1 weighted magnetic resonance image is created typically by using short TE and TR times.
The final image is a reflection of more than one of these pulse sequence parameters, weighted according to the type of sequence and its timing. T1 signals determine predominantly the contrast and brightness in this type of images but proton density will always contribute to the image intensity. The T1 dependence is mainly determined by the repetition time or any pre-pulses (such as in an inversion recovery pulse sequence).
Due to the larger longitudinal and transverse magnetization, fat has a higher signal and will appear bright on a T1 contrast MR image. Conversely, water has less longitudinal magnetization prior to a RF pulse, therefore less transverse magnetization after a RF pulse yielding low signal appearing dark on a T1 contrast image. Often, a paramagnetic contrast agent, a gadolinium compound, is administered, and both pre-contrast T1 weighted images and post-contrast T1 weighted images are obtained.
 
Images, Movies, Sliders:
 Lumbar Spine T1 SE Sagittal  Open this link in a new window
    

Courtesy of  Robert R. Edelman
 Shoulder Axial T1 SE  Open this link in a new window
 Shoulder Coronal T1 SE  Open this link in a new window
    

Courtesy of  Robert R. Edelman
 
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• View the DATABASE results for 'T1 Weighted Image' (5).Open this link in a new window

 
Further Reading:
  Basics:
Magnetic resonance imaging - From Wikipedia, the free encyclopedia.
   by en.wikipedia.org    
  News & More:
Possible New MRI Marker for Multiple Sclerosis Progression
Wednesday, 29 August 2007   by www.medpagetoday.com    
MRI Resources 
MRCP - Hospitals - Mobile MRI - Contrast Agents - MRI Accidents - Software
 
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