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Cardiac StentForum -
related threadsMRI Resource Directory:
 - Safety -
The MRI safety of cardiac stents is dependent of the material, the examined part of the body and the used field strength. A susceptibility artifact is expected also in low magnetic fields, but less.

MRI Safety Guidance
Most of the used materials are non-magnetic, for this case there is no risk for movement caused through the magnetic field. If the cardiac stent is outside the region of the radio frequency pulse, also the risk of e.g. heating is low.

• For this and other aspects of MRI safety see our InfoSheet about MRI Safety.
• Patient-related information is collected in our MRI Patient Information.

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    • MRI Safety
    • Magnetic Forces
    • Wires (MRI Safety Risk)
    • Implants
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Further Reading:
  News & More:
Medtronic Receives FDA Approval for Endeavor® Zotarolimus-Eluting Coronary Stent System
Friday, 1 February 2008   by    
MRI Safety Resources 
Stimulator pool - Cochlear Implant - Breast Implant - Stent - Nerve Stimulator
Cardiovascular ImagingMRI Resource Directory:
 - Cardiovascular Imaging -
Cardiovascular MR imaging includes the complete anatomical display of the heart with CINE imaging of all phases of the heartbeat. Ultrafast techniques make breath hold three-dimensional coverage of the heart in different cardiac axes feasible. Cardiac MRI provides reliable anatomical and functional assessment of the heart and evaluation of myocardial viability and coronary artery disease by a noninvasive diagnostic imaging technique.
Cardiovascular MRI offers potential advantages over radioisotopic techniques because it provides superior spatial resolution, does not use ionizing radiation, has no imaging orientations constraints and contrast resolution better than echocardiography. It also offers direct visualization and characterization of atherosclerotic plaques and diseased vessel walls and surrounding tissues in cardiovascular research.
MRI perfusion approaches measure the alteration of regional myocardial magnetic properties after the intravenous injection of contrast agents and assess the extent of injury after a myocardial infarction and the presence of myocardial viability with a technique based on late enhancement. Extracellular MRI contrast agents, like Gd-DTPA, accumulate only in irreversibly damaged myocardium after a time period of at least 10 minutes.
This type of patients may also have an implanted cardiac stent, bypass or a cardiac pacemaker and special caution should be observed on the MRI safety and the contraindications. While a number of coronary stents have been tested and reported to be MRI compatible, coronary stents must be assessed on an individual basis, with the medical team weighing the risks and benefits of the MRI procedure.
Cardiac MRI overview:
Coronary angiography,
Coronary Angiography with D-Tagging
Myocardial perfusion imaging and viability
Calculation of ventricular volume, myocardial mass and wall thickness
Functional parameters
Description of a stenosis or aneurysma
Anatomical display of the heart, vessels and the surrounding tissue
Cardiovascular MRI has become one of the most effective noninvasive imaging techniques for almost all groups of heart and vascular disease.

Images, Movies, Sliders:
 Angulation of Cardiac Planes Cine Images of Septal Infarct  Open this link in a new window

Courtesy of  Robert R. Edelman

 Left Circumflex Ischemia First-pass Contrast Enhancement  Open this link in a new window

Courtesy of  Robert R. Edelman

 Delayed Myocardial Contrast Enhancement from Infarct  Open this link in a new window

• View the DATABASE results for 'Cardiovascular Imaging' (18).Open this link in a new window

• View the NEWS results for 'Cardiovascular Imaging' (6).Open this link in a new window.
Further Reading:
Cardiac MRI - Technical Aspects Primer
Wednesday, 7 August 2002
Coronary Artery Disease: Combined Stress MR Imaging Protocol-One-Stop Evaluation of Myocardial Perfusion and Function1
A Guide To Cardiac Imaging
  News & More:
New Imaging Technique Reveals Different Heart Motions by Age, Gender
Thursday, 10 December 2009   by    
Rockland Technimed: Tissue Viability Imaging
Saturday, 15 December 2007   by    
MRI Resources 
Breast Implant - Examinations - Education pool - Sequences - Jobs pool - Developers
Heart MRI
Magnetic resonance imaging of the heart is a diagnostic MRI procedure that is useful to evaluate the structures, the function and viability of the heart and the major blood vessels.
See also Cardiac MRI, Cardiovascular Imaging, MRA, Cardiac Stent, Myocardial Late Enhancement and Coronary Angiography.
Radiology-tip.comHeart Scintigraphy,  Coronary CT Angiography
Radiology-tip.comCardiac Ultrasound,  Echocardiography

• View the NEWS results for 'Heart MRI' (18).Open this link in a new window.
Further Reading:
Advanced Imaging Can ID More Causes Of Stroke Before They Strike
Thursday, 22 March 2007   by    
New technique could allow for safer, more accurate heart scans
Thursday, 10 December 2015   by    
  News & More:
Validation of Thermometric Cardiac Imaging by MRI
Thursday, 26 January 2017   by    
MRI shows heart ages differently in women than in men
Tuesday, 20 October 2015   by    
Tiny Brain Blocks as Marker for Heart Disease Too?
Monday, 6 February 2017   by    
Brains Of Term Infants With Heart Disease Resemble Those Of Preemies
Monday, 12 November 2007   by    
Searchterm 'Cardiac Stent' was also found in the following services: 
Resources  (2)  Forum  (2)  
MRI SafetyMRI Resource Directory:
 - Safety -
There are different types of contraindications that would prevent a person from being examined with an MRI scanner. MRI systems use strong magnetic fields that attract any ferromagnetic objects with enormous force. Caused by the potential risk of heating, produced from the radio frequency pulses during the MRI procedure, metallic objects like wires, foreign bodies and other implants needs to be checked for compatibility. High field MRI requires particular safety precautions. In addition, any device or MRI equipment that enters the magnet room has to be MR compatible. MRI examinations are safe and harmless, if these MRI risks are observed and regulations are followed.

Safety concerns in magnetic resonance imaging include:
the magnetic field strength;
possible 'missile effects' caused by magnetic forces;
the potential for heating of body tissue due to the application of the radio frequency energy;
the effects on implanted active devices such as cardiac pacemakers or insulin pumps;
magnetic torque effects on indwelling metal (clips, etc.);
the audible acoustic noise;
danger due to cryogenic liquids;
the application of contrast medium;

MRI Safety Guidance
It is important to remember when working around a superconducting magnet that the magnetic field is always on. Under usual working conditions the field is never turned off. Attention must be paid to keep all ferromagnetic items at an adequate distance from the magnet. Ferromagnetic objects which came accidentally under the influence of these strong magnets can injure or kill individuals in or nearby the magnet, or can seriously damage every hardware, the magnet itself, the cooling system, etc.. See MRI resources Accidents.
The doors leading to a magnet room should be closed at all times except when entering or exiting the room. Every person working in or entering the magnet room or adjacent rooms with a magnetic field has to be instructed about the dangers. This should include the patient, intensive-care staff, and maintenance-, service- and cleaning personnel, etc..
The 5 Gauss limit defines the 'safe' level of static magnetic field exposure. The value of the absorbed dose is fixed by the authorities to avoid heating of the patient's tissue and is defined by the specific absorption rate. Leads or wires that are used in the magnet bore during imaging procedures, should not form large-radius wire loops. Leg-to-leg and leg-to-arm skin contact should be prevented in order to avoid the risk of burning due to the generation of high current loops if the legs or arms are allowed to touch. The patient's skin should not be in contact with the inner bore of the magnet.
The outflow from cryogens like liquid helium is improbable during normal operation and not a real danger for patients.
The safety of MRI contrast agents is tested in drug trials and they have a high compatibility with very few side effects. The variations of the side effects and possible contraindications are similar to X-ray contrast medium, but very rare. In general, an adverse reaction increases with the quantity of the MRI contrast medium and also with the osmolarity of the compound.
See also 5 Gauss Fringe Field, 5 Gauss Line, Cardiac Risks, Cardiac Stent, dB/dt, Legal Requirements, Low Field MRI, Magnetohydrodynamic Effect, MR Compatibility, MR Guided Interventions, Claustrophobia, MRI Risks and Shielding.
Radiology-tip.comRadiation Safety,  Ionizing Radiation
Radiology-tip.comUltrasound Safety,  Absorbed Dose

• View the DATABASE results for 'MRI Safety' (42).Open this link in a new window

• View the NEWS results for 'MRI Safety' (13).Open this link in a new window.
Further Reading:
MRI Safety
2001   by    
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    
Contrast Agents: Safety Profile
  News & More:
Implantable Infusion Pumps in the Magnetic Resonance (MR) Environment: FDA Safety Communication - Important Safety Precautions
Wednesday, 11 January 2017   by    
Newer Heart Devices Safe During MRI
Monday, 23 August 2004   by    
FDA Releases New Guidance On Establishing Safety, Compatibility Of Passive Implants In MR Environments
Tuesday, 16 December 2014   by    
Modern Implantable Heart Devices Safe For Use In MRI Scans
Wednesday, 16 March 2005   by    
MRI Resources 
Mobile MRI Rental - Diffusion Weighted Imaging - Fluorescence - Research Labs - Anatomy - MRI Technician and Technologist Jobs
FlowForum -
related threads
Flow phenomena are intrinsic processes in the human body. Organs like the heart, the brain or the kidneys need large amounts of blood and the blood flow varies depending on their degree of activity. Magnetic resonance imaging has a high sensitivity to flow and offers accurate, reproducible, and noninvasive methods for the quantification of flow. MRI flow measurements yield information of blood supply of of various vessels and tissues as well as cerebro spinal fluid movement.
Flow can be measured and visualized with different pulse sequences (e.g. phase contrast sequence, cine sequence, time of flight angiography) or contrast enhanced MRI methods (e.g. perfusion imaging, arterial spin labeling).
The blood volume per time (flow) is measured in: cm3/s or ml/min. The blood flow-velocity decreases gradually dependent on the vessel diameter, from approximately 50 cm per second in arteries with a diameter of around 6 mm like the carotids, to 0.3 cm per second in the small arterioles.

Different flow types in human body:
Behaves like stationary tissue, the signal intensity depends on T1, T2 and PD = Stagnant flow
Flow with consistent velocities across a vessel = Laminar flow
Laminar flow passes through a stricture or stenosis (in the center fast flow, near the walls the flow spirals) = Vortex flow
Flow at different velocities that fluctuates = Turbulent flow

See also Flow Effects, Flow Artifact, Flow Quantification, Flow Related Enhancement, Flow Encoding, Flow Void, Cerebro Spinal Fluid Pulsation Artifact, Cardiovascular Imaging and Cardiac MRI.
Images, Movies, Sliders:
 MVP Parasternal  Open this link in a new window

Courtesy of  Robert R. Edelman
 TOF-MRA Circle of Willis Inverted MIP  Open this link in a new window

 Circle of Willis, Time of Flight, MIP  Open this link in a new window
SlidersSliders Overview


• View the DATABASE results for 'Flow' (113).Open this link in a new window

• View the NEWS results for 'Flow' (7).Open this link in a new window.
MRI Resources 
Services and Supplies - Movies - Used and Refurbished MRI Equipment - Universities - Blood Flow Imaging - MRI Technician and Technologist Jobs
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