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Result : Searchterm 'K-Space' found in 6 terms [] and 56 definitions []
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Searchterm 'K-Space' was also found in the following services: 
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News  (1)  Resources  (2)  Forum  (10)  
 
Biograph mMR
 
www.healthcare.siemens.com/magnetic-resonance-imaging/mr-pet-scanner/biograph-mmr FDA cleared and CE Mark 2011.
The Biograph mMR has a fully-integrated design for simultaneous PET/MRI imaging. The dedicated hardware includes solid-state, avalanche photodiode PET detector and adapted, PET-compatible MR coils.
The possibility of truly simultaneous operation allows the acquisition of several magnetic resonance imaging (MRI) sequences during the positron emission tomography (PET) scan, without increasing the examination time.
See also Hybrid Imaging.
Device Information and Specification
CLINICAL APPLICATION
Whole Body
CONFIGURATION
Simultaneous PET/MRI
3 Tesla
Full range of MRI coils
CHANNELS
up to 32
PET ACQUISITION MODES
3D
MRI ACQUISITION MODES
2D/3D, spectroscopy;; iPAT, GRAPPA (k-space), noncontrast angiography, radial motion compensation
PET EFFECTIVE AXIAL FOV
26 cm (typical overlap 23%)
MRI FOV
A-P 45, R-L 50, H-F 50 cm
PET RING DIAMETER
65.6 cm
PATIENT SCAN RANGE
199 cm
HORIZONTAL SPEED
200 mmsec
TABLE CAPACITY
200 kg
PET DETECTOR
Solid state, 4032 avalanche photo diodes
DETECTOR SCINTILLATION MATERIAL
LSO, 28672 crystals
CRYSTAL SIZE
4 x 4 x 20 mm
MAGNET WEIGHT
9000 kg
DIMENSION H*W*D (gantry included)
335 x 230 x 242 cm (finshed covers)
5-GAUSS FRINGE FIELD
2.6 m / 4.6 m
CRYOGEN USE
Zero boil off rate, approx. 10 years
COOLING SYSTEM
PET system: water; MRI system: water
up to 200 T/m/s
MAX. AMPLITUDE
45 mT/m
Aautomatic, patient specific shim; active shim 3 linear and 5 non-linear channels (seond order)
POWER REQUIREMENTS
380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; Total system 110kW
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Further Reading:
  Basics:
Performance Measurements of the Siemens mMR Integrated Whole-Body PET/MR Scanner
Friday, 11 November 2011   by jnm.snmjournals.org    
Global Trends in Hybrid Imaging
Monday, 1 November 2010   by pubs.rsna.org    
  News & More:
Positron Emission Tomographic Imaging in Stroke
Monday, 28 December 2015   by www.ncbi.nlm.nih.gov    
A world's first in imaging – integrated whole-body molecular MR system available for clinical use testing
Thursday, 18 November 2010   by www.siemens.com    
FDA Clears New System to Perform Simultaneous PET, MRI Scans
Friday, 10 June 2011   by www.prnewswire.com    
Frost & Sullivan Award Underlines Siemens Healthcare's Contribution to New Product Innovation in the North American Medical Imaging Market
Wednesday, 13 July 2011   by multivu.prnewswire.com    
MRI Resources 
Societies - Jobs - Nerve Stimulator - Journals - Software - Health
 
Care Bolus
 
Using a care bolus ensures optimal contrast of arterial vessels in contrast enhanced MRA. The center of the k-space is measured as quickly as possible once the contrast agent reaches the region of interest.
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• View the DATABASE results for 'Care Bolus' (3).Open this link in a new window

MRI Resources 
Liver Imaging - Bioinformatics - Claustrophobia - Quality Advice - Patient Information - Used and Refurbished MRI Equipment
 
Central Lines
 
A part in the k-space filled with signals made by phase encoding gradients (weak) used for contrast-determination.
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Contrast Enhanced Magnetic Resonance AngiographyInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - MRA -
 
(CE MRA) Contrast enhanced MR angiography is based on the T1 values of blood, the surrounding tissue, and paramagnetic contrast agent.
T1-shortening contrast agents reduces the T1 value of the blood (approximately to 50 msec, shorter than that of the surrounding tissues) and allow the visualization of blood vessels, as the images are no longer dependent primarily on the inflow effect of the blood. Contrast enhanced MRA is performed with a short TR to have low signal (due to the longer T1) from the stationary tissue, short scan time to facilitate breath hold imaging, short TE to minimize T2* effects and a bolus injection of a sufficient dose of a gadolinium chelate.
Images of the region of interest are performed with 3D spoiled gradient echo pulse sequences. The enhancement is maximized by timing the contrast agent injection such that the period of maximum arterial concentration corresponds to the k-space acquisition. Different techniques are used to ensure optimal contrast of the arteries e.g., bolus timing, automatic bolus detection, bolus tracking, care bolus. A high resolution with near isotropic voxels and minimal pulsatility and misregistration artifacts should be striven for. The postprocessing with the maximum intensity projection (MIP) enables different views of the 3D data set.
Unlike conventional MRA techniques based on velocity dependent inflow or phase shift techniques, contrast enhanced MRA exploits the gadolinium induced T1-shortening effects. CE MRA reduces or eliminates most of the artifacts of time of flight angiography or phase contrast angiography. Advantages are the possibility of in plane imaging of the blood vessels, which allows to examine large parts in a short time and high resolution scans in one breath hold. CE MRA has found a wide acceptance in the clinical routine, caused by the advantages:
•
3D MRA can be acquired in any plane, which means that greater vessel coverage can be obtained at high resolution with fewer slices (aorta, peripheral vessels);
•
the possibility to perform a time resolved examination (similarly to conventional angiography);
•
no use of ionizing radiation; paramagnetic agents have a beneficial safety.
 
Images, Movies, Sliders:
 CE-MRA of the Carotid Arteries  Open this link in a new window
    
SlidersSliders Overview

 CE MRA of the Aorta  Open this link in a new window
    
SlidersSliders Overview

 CE-MRA of the Carotid Arteries Colored MIP  Open this link in a new window
    
SlidersSliders Overview

 
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• View the DATABASE results for 'Contrast Enhanced Magnetic Resonance Angiography' (14).Open this link in a new window


• View the NEWS results for 'Contrast Enhanced Magnetic Resonance Angiography' (2).Open this link in a new window.
 
Further Reading:
  Basics:
Contrast-Enhanced MR Angiography(.pdf)
   by ric.uthscsa.edu    
CONTRAST ENHANCED MR ANGIOGRAPHY – PRINCIPLES, APPLICATIONS, TIPS AND PITFALLS(.pdf)
  News & More:
CONTRAST-ENHANCED MRA OF THE CAROTIDS(.pdf)
PERIPHERAL VASCULAR MAGNETIC RESONANCE ANGIOGRAPHY(.pdf)
CONTRAST ENHANCED MRI OF THE LIVER STATE-OF-THE-ART(.pdf)
MRI Resources 
Homepages - Devices - Shielding - Developers - Artifacts - Hospitals
 
Contrast Enhanced Timing Robust Angiography
 
(CENTRA) A special form of k-space acquisition especially for contrast enhanced MRA. Longer scan times for high image resolution is possible, without a venous overlay, because the vast majority of contrast information is acquired only in the first seconds, the remaining scan time is used for resolution.
 
Images, Movies, Sliders:
 CE-MRA of the Carotid Arteries  Open this link in a new window
    
SlidersSliders Overview

 
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MRI Resources 
Online Books - Homepages - Stimulator pool - Intraoperative MRI - Shoulder MRI - Education
 
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