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5 Gauss Line
 
This line specifies the perimeter around a MR scanner within which the static magnetic fields are higher than five gauss. Five gauss and below are considered 'safe' levels of static magnetic field exposure for the general public.
Portable devices requiring a separation distance between the device and the MR magnet, should not be considered 'MR Safe', 'MR Compatible', or intended for use in the MR environment. Typically the 5 gauss line is the only location where the static magnetic field strength is specified around a MR scanner. Therefore, labeling specifying a separation distance between the MR magnet and the device to ensure safe or proper operation of the device should be avoided.

See also the related poll result: 'In 2010 your scanner will probably work with a field strength of'
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• For this and other aspects of MRI safety see our InfoSheet about MRI Safety.
• Patient-related information is collected in our MRI Patient Information.

 
• Related Searches:
    • Magnetic Fringe Field
    • Superconducting Magnet
    • Cardiac Pacemaker
    • 5 Gauss Limit
    • Permanent Magnet
 
Further Reading:
  News & More:
Boston Scientific and Biophan in MRI Collaboration
Friday, 21 November 2003   by www.medimaging.net    
World's First Portable MRI Cleared by FDA
Monday, 17 February 2020   by www.medgadget.com    
Searchterm 'Device' was also found in the following services: 
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Radiology  (21) Open this link in a new windowUltrasound  (74) Open this link in a new window
MRI Procedure
 
The MRI device is located within a specially shielded room (Faraday cage) to avoid outside interference, caused by the use of radio waves very close in frequency to those of ordinary FM radio stations.
The MRI procedure can easily be performed through clothing and bones, but attention must be paid to ferromagnetic items, because they will be attracted from the magnetic field. A hospital gown is appropriate, or the patient should wear clothing without metal fasteners and remove any metallic objects like hairpins, jewelry, eyeglasses, clocks, hearing aids, any removable dental work, lighters, coins etc., not only for MRI safety reasons. Metal in or around the scanned area can also cause errors in the reconstructed images (artifacts). Because the strong magnetic field can displace, or disrupt metallic objects, people with an implanted active device like a cardiac pacemaker cannot be scanned under normal circumstances and should not enter the MRI area.
The MRI machine can look like a short tunnel or has an open MRI design and the magnet does not completely surround the patient. Usually the patient lies on a comfortable motorized table, which slides into the scanner, depending on the MRI device, patients may be also able to sit up. If a contrast agent is to be administered, intravenous access will be placed. A technologist will operate the MRI machine and observe the patient during the examination from an adjacent room. Several sets of images are usually required, each taking some minutes. A typical MRI scan includes three to nine imaging sequences and may take up to one hour. Improved MRI devices with powerful magnets, newer software, and advanced sequences may complete the process in less time and better image quality.
Before and after the most MRI procedures no special preparation, diet, reduced activity, and extra medication is necessary. The magnetic field and radio waves are not felt and no pain is to expect.
Movement can blur MRI images and cause certain artifacts. A possible problem is the claustrophobia that some patients experience from being inside a tunnel-like scanner. If someone is very anxious or has difficulty to lie still, a sedative agent may be given. Earplugs and/or headphones are usually given to the patient to reduce the loud acoustic noise, which the machine produces during normal operation. A technologist observes the patient during the test. Some MRI scanners are equipped with televisions and music to help the examination time pass.
MRI is not a cheap examination, however cost effective by eliminating the need for invasive radiographic procedures, biopsies, and exploratory surgery. MRI scans can also save money while minimizing patient risk and discomfort. For example, MRI can reduce the need for X-ray angiography and myelography, and can eliminate unnecessary diagnostic procedures that miss occult disease.

See also Magnetic Resonance Imaging MRI, Medical Imaging, Cervical Spine MRI, Claustrophobia, MRI Risks and Pregnancy.
For Ultrasound Imaging (USI) see Ultrasound Imaging Procedures at Medical-Ultrasound-Imaging.com.

See also the related poll result: 'MRI will have replaced 50% of x-ray exams by'
 
Images, Movies, Sliders:
 Brain MRI Images Axial T2  Open this link in a new window
      

 Circle of Willis, Time of Flight, MIP  Open this link in a new window
    
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 CE-MRA of the Carotid Arteries  Open this link in a new window
    
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 Sagittal Knee MRI Images T1 Weighted  Open this link in a new window
      

 
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• View the DATABASE results for 'MRI Procedure' (11).Open this link in a new window


• View the NEWS results for 'MRI Procedure' (6).Open this link in a new window.
 
Further Reading:
  News & More:
MRI technology visualizes heart metabolism in real time
Friday, 18 November 2022   by medicalxpress.com    
Are synthetic contrast-enhanced breast MRI images as good as the real thing?
Friday, 18 November 2022   by healthimaging.com    
Ultrafast MRI protocol reduces scan time by 10 minutes for cervical imaging
Monday, 26 September 2022   by healthimaging.com    
Study: Fast MRI can diagnose TBI without radiation
Wednesday, 18 September 2019   by www.aappublications.org    
Metamaterials boost sensitivity of MRI machines
Thursday, 14 January 2016   by www.eurekalert.org    
Working with MRI machines may cause vertigo: Study
Wednesday, 25 June 2014   by www.cos-mag.com    
MRI Safety Resources 
Implant and Prosthesis pool - Stent - Pacemaker - Shielding - Nerve Stimulator
 
Computer
 
MRI computer can be divided into central processing unit (CPU), consisting of instruction, interpretation and arithmetic unit plus fast access memory, and peripheral devices such as bulk data storage and input and output devices (including, via the interface, the spectrometer). The computer controls the RF pulses and gradients necessary to acquire data, and process the data to produce spectra or images. (Devices such as the spectrometer may themselves incorporate small computers.)

See also Digital to Analog Converter, Analog to Digital Converter, Transformer, Pulse Programmer, Array Processor, Detector.

See also the related poll result: 'Most outages of your scanning system are caused by failure of'
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• View the DATABASE results for 'Computer' (37).Open this link in a new window


• View the NEWS results for 'Computer' (18).Open this link in a new window.
 
Further Reading:
  News & More:
University of Texas supercomputer speeds real-time MRI analysis
Thursday, 2 March 2017   by www.information-management.com    
Superhuman 20 second AI heart tool begins NHS roll-out
Friday, 11 March 2022   by www.bhf.org.uk    
Computer tool maps ridges on brain's bumpy surface
Tuesday, 1 August 2017   by spectrumnews.org    
Searchterm 'Device' was also found in the following services: 
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News  (96)  Resources  (22)  Forum  (10)  
 
Low Field MRIForum -
related threads
 
Advantages of low field imaging are the small-sized 5 Gauss fringe field and therefore the less static magnetic field exposure for the surrounding area, as well as less contraindications causing lower risks for the MRI safety by implemented metal and magnetic devices and equipment.
Low field systems are sometimes for restricted use, e.g. dedicated extremity scanner or open MRI devices. Open MRI devices equipped with permanent magnets are well-suited for MR guided interventions because these machines combine the lower magnetic fields of this type of magnets and the better patient access of open MRI scanner.
In some cases, the contrast of different tissues is better at lower field strength, depending on their T1 or T2 relaxation times. The disadvantage of the lower signal to noise ratio are a poor resolution and a longer scan time for a good image quality.

See also Claustrophobia, Contraindications and MRI Safety.

See also the related poll result: 'In 2010 your scanner will probably work with a field strength of'
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• View the DATABASE results for 'Low Field MRI' (8).Open this link in a new window


• View the NEWS results for 'Low Field MRI' (5).Open this link in a new window.
 
Further Reading:
  Basics:
Improving portable low-field MRI image quality through image-to-image translation using paired low- and high-field images
Friday, 1 December 2023   by www.nature.com    
  News & More:
Safety of Bedside Portable Low-Field Brain MRI in ECMO Patients Supported on Intra-Aortic Balloon Pump
Friday, 18 November 2022   by www.mdpi.com    
Researchers at the University of Tsukuba develop a portable MRI system specifically for identifying wrist cartilage damage among athletes, providing a convenient means of early detection and treatment of injuries
Tuesday, 26 April 2022   by www.tsukuba.ac.jp    
This bizarre looking helmet can create better brain scans
Friday, 11 February 2022   by www.sciencedaily.com    
A low-cost and shielding-free ultra-low-field brain MRI scanner
Tuesday, 14 December 2021   by www.nature.com    
Portable MRI provides life-saving information to doctors treating strokes
Thursday, 5 August 2021   by news.yale.edu    
Synaptive Evry, an MRI for Any Space, Cleared by FDA
Thursday, 30 April 2020   by www.medgadget.com    
World's First Portable MRI Cleared by FDA
Monday, 17 February 2020   by www.medgadget.com    
Introducing a point-of-care MRI system
Tuesday, 29 October 2019   by healthcare-in-europe.com    
Opportunities in Interventional and Diagnostic Imaging by Using High-performance Low-Field-Strength MRI
Tuesday, 1 October 2019   by pubs.rsna.org    
Portable 'battlefield MRI' comes out of the lab
Thursday, 30 April 2015   by physicsworld.com    
Portable MRI could aid wounded soldiers and children in the third world
Thursday, 23 April 2015   by phys.org    
Searchterm 'Device' was also found in the following services: 
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Radiology  (21) Open this link in a new windowUltrasound  (74) Open this link in a new window
MagneVu 1000InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.mri4ra.com/isis.html From MagneVu;
The MagneVu 1000 is a compact, robust, and portable, permanent magnet MRI system and operates without special shielding or costly site preparation.
This MRI device utilizes a patented non-homogeneous magnetic field image acquisition method to achieve high performance imaging. The MagneVu 1000 MRI scanner is designed for MRI of the extremities with the current specialty areas in diabetes and rheumatoid arthritis. Easy access is afforded for claustrophobic, pediatric, or limited mobility patients.
In August 1998 FDA marketing clearance and other regulatory approvals have been received.
Until 2008, over 130 devices in the US are in use. Some further developments of MagneVu's extremity scanner are: 'truly Plug n' Play MRI™' and iSiS ( which adds wireless capability to the second generation MV1000-XL).
Device Information and Specification
CLINICAL APPLICATION
Dedicated extremity
CONFIGURATION
Portable open MRI
IMAGING MODES
3-dimensional multi-echo data acquisition
3D: 0.6-1 mm
MAGNET TYPE
Permanent
MAGNET WEIGHT
about 50 kg
POWER REQUIREMENTS
110 V
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• View the DATABASE results for 'MagneVu 1000' (3).Open this link in a new window

 
Further Reading:
  News & More:
VALUE OF 3D T1W & STIR MRI SEQUENCES IN DIAGNOSING EROSIONS IN RHEUMATOID ARTHRITIS
   by www.bocaradiology.com    
MRI Resources 
Musculoskeletal and Joint MRI - Guidance - Cardiovascular Imaging - Crystallography - Spectroscopy - Education
 
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