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Result : Searchterm 'Spine MRI' found in 3 terms [] and 8 definitions [], (+ 14 Boolean[] results
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Volumetric Imaging
 
Volumetric imaging is a 3D technique where all the MRI signals are collected from the entire tissue sample and imaged as a whole entity, therefore providing a high signal to noise ratio. The acquisition of isotropic voxels or thin slices with high spatial resolution allows to create multiplanar reconstructions in all planes; a compensation for the usually longer scan time. The acquisition time can be reduced by parallel imaging technique.
New T2 weighted variants of 3D sequences (FSE-XETA, T2-SPACE, VISTA) have been introduced that differ from conventional FSE sequences. An echo train containing up to 200 echoes obtained at a minimum echo spacing allows very fast acquisition. A flip angle modulation (flip angle sweep - FAS) during the FSE readout carries magnetization as long as possible to avoid blurring and provide optimal signal at the effective echo time. This type of imaging is well suited for brain and spine MRI procedures.
Newer T1 weighted variants include Liver Acquisition with Volume Acquisition (LAVA) and T1W High Resolution Isotropic Volume Examination (THRIVE), which have advantages for dynamic breath hold imaging in liver and abdominal examinations.
See also Volume Imaging, 3 Dimensional Imaging.
 
Images, Movies, Sliders:
 Brain MRI Sagittal T1 001  Open this link in a new window
    
 Circle of Willis, Time of Flight, MIP  Open this link in a new window
    
SlidersSliders Overview

 MRI of the Skull Base  Open this link in a new window
    
SlidersSliders Overview

 
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• View the NEWS results for 'Volumetric Imaging' (1).Open this link in a new window.
 
Further Reading:
  Basics:
Cutting Edge Imaging of THE Spine
February 2007   by www.pubmedcentral.nih.gov    
3-D VOLUMETRIC IMAGING FOR STEREOTACTIC LESIONAL AND DEEP BRAIN STIMULATION SURGERY
MRI Resources 
Sequences - Open Directory Project - Breast MRI - Knee MRI - Online Books - Safety pool
 
MAGNETOM ESSENZA
 
From Siemens Medical Systems;
www.healthcare.siemens.com/magnetic-resonance-imaging/0-35-to-1-5t-mri-scanner/magnetom-essenza/ Received FDA clearance in 2007.
The MAGNETOM Essenza is designed to combine high system performance with simple installation and power requirements to provide optimal operating costs for limited budgets. The standard system has up to 25 integrated coil elements and 8 independent radio frequency channels. Tim allows the combination of up to 4 different coils that reduce patient and coil repositioning.
The 1.5 Tesla system is designated for a complete range of clinical applications, including neurology, orthopedics, body imaging, angiography, cardiology, breast imaging, oncology and pediatric MRI.


Device Information and Specification
CLINICAL APPLICATION Whole Body
CONFIGURATION Ultra-short bore
FIELD STRENGTH 1.5 Tesla
SURFACE COILS Head, spine, torso/ body coil, neurovascular, cardiac, neck, and multi-purpose flex coils. Peripheral vascular, breast, shoulder, knee, wrist, foot//ankle, TMJ optional.
CHANNELS (min. / max. configuration) 8, 16
SPECTROSCOPY Chemical shift imaging and single volume spectroscopy
IMAGING TECHNIQUES iPAT, mSENSE and GRAPPA (image, k-space), noncontrast angiography, radial motion compensation
MINIMUM TR 3-D GRE: 1.58 (256 matrix)
MINIMUM TE 3-D GRE: 0.5 (256 matrix)
FOV 0.5 - 45 cm
BORE DIAMETER
At isocenter: 60 cm
TABLE CAPACITY 200 kg
MAGNET WEIGHT (gantry included) 4350 kg in operation
DIMENSION H*W*D (gantry included) 145 x 226 x 216 cm
5-GAUSS FRINGE FIELD 2.5 m / 4.0 m
MAGNET TYPE Superconducting
CRYOGEN USE Zero boil off rate, approx. 10 years
COOLING SYSTEM Water; single cryogen, 2 stage refrigeration
SLEW RATE up to 100 T/m/s
MAX. AMPLITUDE, RISE TIME 30 mT/m, 300 msec to 10 mT/m
SHIMMING Passive, active; first order standard second order optional
POWER REQUIREMENTS 380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; 45 kVA
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Further Reading:
  Basics:
Magnetom Essenza - Typical Room Plan
   by ftp.siemensmedical.com    
MRI Resources 
Jobs pool - Used and Refurbished MRI Equipment - Developers - Distributors - Functional MRI - Image Quality
 
MAGNETOM Skyra
 
From Siemens Medical Systems;
www.healthcare.siemens.com/magnetic-resonance-imaging/0-35-to-1-5t-mri-scanner/magnetom-skyra/ Received FDA clearance in 2010.
MAGNETOM Skyra is a top-of-the-line, patient friendly wide bore 3 Tesla MRI system.
The system is equipped with the Tim 4G and Dot system (Total imaging matrix and Day optimizing throughput), to enhance both productivity and image quality with the complete range of advanced applications for clinical routine and research. Tim 4G features lighter, trimmer MRI coils that take up less space inside the magnet but deliver a high coil element density with increased signal to noise ratio and the possibility to use high iPAT factors.


Device Information and Specification
CLINICAL APPLICATION Whole Body
CONFIGURATION Open bore
FIELD STRENGTH 3 Tesla
SURFACE COILS Head, spine, torso/ body coil, neurovascular, cardiac, neck, shoulder, knee, wrist, foot//ankle and multi-purpose flex coils. Peripheral vascular, breast, shoulder.
CHANNELS (min. / max. configuration) 48, 64, 128
SPECTROSCOPY Chemical shift imaging, single voxel spectroscopy
IMAGING TECHNIQUES iPAT, mSENSE and GRAPPA (image, k-space),CAIPIRINHA (k-space), noncontrast angiography, plaque imaging, radial motion compensation, Dixon
MINIMUM TR 3D T1 spoiled GRE: 0.95 (256 matrix)
MINIMUM TE 3D T1 spoiled GRE: 0.22 (256 matrix), Ultra-short TE
FOV 0.5 - 50 cm
BORE DIAMETER
or W x H
At isocenter: L-R 70 cm, A-P (with table) 55 cm
TABLE CAPACITY 250 kg
MAGNET WEIGHT (gantry included) 5768 kg
DIMENSION H*W*D (gantry included) 173 x 231 x 219 cm
5-GAUSS FRINGE FIELD 2.6 m / 4.6 m
MAGNET TYPE Superconducting
CRYOGEN USE Zero boil off rate, approx. 10 years
COOLING SYSTEM Water; single cryogen, 2 stage refrigeration
SLEW RATE up to 200 T/m/s
MAX. AMPLITUDE 45 mT/m
SHIMMING 3 linear with 20 coils, 5 nonlinear 2nd-order
POWER REQUIREMENTS 380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; 110 kVA
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Searchterm 'Spine MRI' was also found in the following services: 
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News  (17)  Resources  (7)  Forum  (4)  
 
MAGNETOM Spectra
 
From Siemens Medical Systems;
www.healthcare.siemens.com/magnetic-resonance-imaging/3t-mri-scanner/magnetom-spectra Received FDA clearance in 2012.
The MAGNETOM Spectra is a cost-optimized high field MRI system with Tim 4G and Dot technologies. The system consumes less energy compared to other 3 Tesla scanners. The magnet-cooling helium is contained in a closed loop, which prevents the gas from escaping and reduces the need for refills. TimTX includes innovative techniques in the radio frequency excitation hardware as well as new application and processing features enabling uniform RF distribution in all body regions.


Device Information and Specification
CLINICAL APPLICATION Whole Body
CONFIGURATION Short bore
FIELD STRENGTH 3 Tesla
SURFACE COILS Head, spine, torso/ body coil, neurovascular, neck and multi-purpose flex coils. Peripheral vascular, breast, shoulder, knee, wrist, foot//ankle, endorectal optional.
CHANNELS 24
SPECTROSCOPY Chemical shift imaging, single voxel spectroscopy
IMAGING TECHNIQUES iPAT, mSENSE and GRAPPA (image, k-space), noncontrast angiography, radial motion compensation
FOV 0.5 - 45 cm
BORE DIAMETER
or W x H
At isocenter: L-R 60 cm
TABLE CAPACITY 200 kg
MAGNET WEIGHT 7200 kg
DIMENSION H*W*D (gantry included) 173 x 231 x 219 cm
5-GAUSS FRINGE FIELD 2.6 m / 4.6 m
MAGNET TYPE Superconducting
CRYOGEN USE Zero boil off rate, approx. 10 years
COOLING SYSTEM Water; single cryogen, 2 stage refrigeration
SLEW RATE up to 125 T/m/s
MAX. AMPLITUDE 33 mT/m
SHIMMING Passive, active; first order standard, second order optional
POWER REQUIREMENTS 380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; connection value with chiller 100 kvA /without chiller 60 kVA
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MRI Resources 
Online Books - Examinations - Equipment - IR - Education - MRI Physics
 
Magnetization Transfer Contrast
 
(MTC) This MRI method increases the contrast by removing a portion of the total signal in tissue. An off resonance radio frequency (RF) pulse saturates macromolecular protons to make them invisible (caused by their ultra-short T2* relaxation times). The MRI signal from semi-solid tissue like brain parenchyma is reduced, and the signal from a more fluid component like blood is retained.
E.g., saturation of broad spectral lines may produce decreases in intensity of lines not directly saturated, through exchange of magnetization between the corresponding states; more closely coupled states will show a greater resulting intensity change. Magnetization transfer techniques make demyelinated brain or spine lesions (as seen e.g. in multiple sclerosis) better visible on T2 weighted images as well as on gadolinium contrast enhanced T1 weighted images.
Off resonance makes use of a selection gradient during an off resonance MTC pulse. The gradient has a negative offset frequency on the arterial side of the imaging volume (caudally more off resonant and cranially less off resonant). The net effect of this type of pulse is that the arterial blood outside the imaging volume will retain more of its longitudinal magnetization, with more vascular signal when it enters the imaging volume. Off resonance MTC saturates the venous blood, leaving the arterial blood untouched.
On resonance has no effect on the free water pool but will saturate the bound water pool and is the difference in T2 between the pools. Special binomial pulses are transmitted causing the magnetization of the free protons to remain unchanged. The z-magnetization returns to its original value. The spins of the bound pool with a short T2 experience decay, resulting in a destroyed magnetization after the on resonance pulse.
See also Magnetization Transfer.
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• View the DATABASE results for 'Magnetization Transfer Contrast' (5).Open this link in a new window

 
Further Reading:
  News & More:
MRI of the Human Eye Using Magnetization Transfer Contrast Enhancement
   by www.iovs.org    
MRI Resources 
Portals - Developers - Shielding - Functional MRI - Knee MRI - Shoulder MRI
 
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