Magnetic Resonance - Technology Information Portal Welcome to MRI Technology
Info
  Sheets

Out-
      side
 



 
 'MRI' 
SEARCH FOR    
 
  2 3 5 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Result : Searchterm 'MRI' found in 26 terms [] and 446 definitions []
previous     16 - 20 (of 472)     next
Result Pages : [1 2 3 4 5 6]  [7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... ]
Searchterm 'MRI' was also found in the following services: 
spacer
News  (1300)  Resources  (333)  Forum  (379)  
 
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'
spacer
 
• Related Searches:
    • Claustrophobia
    • MRI Safety
    • Open MRI
    • Field Strength
    • Image Contrast Characteristics
 
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 'MRI' was also found in the following services: 
spacer
Radiology  (20) Open this link in a new windowUltrasound  (24) Open this link in a new window
MRI EquipmentInfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.
 
The MRI equipment consists of following components:
The magnet generates the magnetic field.
Shim coils make the magnetic field homogeneous.
Radio frequency coils transmit the radio signal into the body part being imaged.
Receiver coils detect the returning radio signals.
Gradient coils provide spatial localization of the signals.
Shielding coils produce a magnetic field that cancels the field from primary coils in regions where it is not desired.
The computer reconstructs the signals into the image.
The MRI scanner room is shielded by a faraday shield.
Different cooling systems cool the magnet, the scanner room and the technique room.

Better MRI equipment and software design along with the latest information technology improves system maintenance and overall communication. Software and digital imaging and communications in medicine (DICOM) compatibility allows to network into hospital databases, helps to modify pulse sequences, data post processing, and archiving via picture archiving and communication system (PACS).

See also the related poll result: 'Most outages of your scanning system are caused by failure of'
Radiology-tip.comradCT Scanner,  Radiography
spacer
Medical-Ultrasound-Imaging.comUltrasound Machine,  Ultrasound System Performance
spacer

• View the DATABASE results for 'MRI Equipment' (13).Open this link in a new window


• View the NEWS results for 'MRI Equipment' (4).Open this link in a new window.
 
Further Reading:
  News & More:
Low Power MRI Helps Image Lungs, Brings Costs Down
Thursday, 10 October 2019   by www.medgadget.com    
MRI safety targeted as new group offers credentialing test
Monday, 12 January 2015   by www.modernhealthcare.com    
Audio/Video System helps patients relax during MRI scans
Monday, 8 December 2014   by news.thomasnet.com    
Dräger introduces anaesthesia system for MRI environment
Wednesday, 12 December 2007   by www.mtbeurope.info    
MRI Resources 
DICOM - Case Studies - Spine MRI - RIS - Libraries - Service and Support
 
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
    
SlidersSliders Overview

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

 Breast MRI Images T2 And T1 Pre - Post Contrast  Open this link in a new window
 Sagittal Knee MRI Images T1 Weighted  Open this link in a new window
      

 
spacer

• 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    
Searchterm 'MRI' was also found in the following services: 
spacer
News  (1300)  Resources  (333)  Forum  (379)  
 
High Field MRI
 
The principal advantage of MRI at high field is the increase in signal to noise ratio. This can be used to improve anatomic and/or temporal resolution and reduce scan time while preserving image quality. MRI devices for whole body imaging for human use are available up to 3 tesla (3T). Functional MRI (fMRI) and MR spectroscopy (MRS) benefit significantly. In addition, 3T machines have a great utility in applications such as TOF MRA and DTI. Higher field strengths are used for imaging of small parts of the body or scientific animal experiments. Higher contrast may permit reduction of gadolinium doses and, in some cases, earlier detection of disease.
Using high field MRI//MRS, the RF-wavelength and the dimension of the human body complicating the development of MR coils. The absorption of RF power causes heating of the tissue. The energy deposited in the patient's tissues is fourfold higher at 3T than at 1.5T. The specific absorption rate (SAR) induced temperature changes of the human body are the most important safety issue of high field MRI//MRS.
Susceptibility and chemical shift dispersion increase like T1, therefore high field MRI occasionally exhibits imaging artifacts. Most are obvious and easily recognized but some are subtle and mimic diseases. A thorough understanding of these artifacts is important to avoid potential pitfalls. Some imaging techniques or procedures can be utilized to remove or identify artifacts.

See also Diffusion Tensor Imaging.

See also the related poll result: 'In 2010 your scanner will probably work with a field strength of'
Medical-Ultrasound-Imaging.comMagnetic Resonance Guided Focused Ultrasound,  High Intensity Focused Ultrasound
spacer

• View the DATABASE results for 'High Field MRI' (16).Open this link in a new window


• View the NEWS results for 'High Field MRI' (9).Open this link in a new window.
 
Further Reading:
  Basics:
Next-generation 7 T scanner ramps the resolution of brain MR imaging
Wednesday, 17 January 2024   by physicsworld.com    
A paired dataset of T1- and T2-weighted MRI at 3 Tesla and 7 Tesla
Thursday, 27 July 2023   by www.nature.com    
CLINICAL WHOLE BODY MRI AT 3.0 T(.pdf)
2001
Musculoskeletal MRI at 3.0 T: Relaxation Times and Image Contrast
Sunday, 1 August 2004   by www.ajronline.org    
  News & More:
How safe is 7T MRI for patients with neurosurgical implants?
Thursday, 17 November 2022   by healthimaging.com    
Impact of Magnetic Field Inhomogeneity on the Quality of Magnetic Resonance Images and Compensation Techniques: A Review
Saturday, 1 October 2022   by www.dovepress.com    
7-T clinical MRI of the shoulder in patients with suspected lesions of the rotator cuff
Friday, 7 February 2020   by eurradiolexp.springeropen.com    
A 100-hour MRI scan captured the most detailed look yet at a whole human brain
Monday, 8 July 2019   by www.sciencenews.or    
T2-Weighted Liver MRI Using the MultiVane Technique at 3T: Comparison with Conventional T2-Weighted MRI
Friday, 16 October 2015   by www.ncbi.nlm.nih.gov    
Ultra-high-field MRI reveals language centres in the brain in much more detail
Tuesday, 28 October 2014   by medicalxpress.com    
Turbo-FLASH Based Arterial Spin Labeled Perfusion MRI at 7 T
Thursday, 20 June 2013   by www.plosone.org    
High-Resolution, Spin-Echo BOLD, and CBF fMRI at 4 and 7 T(.pdf)
October 2002   by otg.downstate.edu    
Vascular Filters of Functional MRI: Spatial Localization Using BOLD and CBV Contrast
Searchterm 'MRI' was also found in the following services: 
spacer
Radiology  (20) Open this link in a new windowUltrasound  (24) Open this link in a new window
Upright™ MRIInfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.fonar.com/standup.htm www.fonar.com/standup.htm www.fonar.com/standup.htm From FONAR Corporation;
in October of 2004, the company changed the product name of the Stand-Up™ MRI to the Upright™ MRI. The Indomitable™, Upright™ MRI is the only open MRI in the world that can perform positional MRI (pMRI), i.e. the Upright MRI™ scans patients in upright, weight-bearing positions, in addition to the conventional lie-down positions. The Upright™ MRI is the only device that can scan patients in the position their symptoms occur, in their position of pain. In early clinical reports independently confirm the effectiveness and potential of positional MRI. In October 2000, Fonar received permission to market the Indomitable™ from the FDA.
Device Information and Specification
CLINICAL APPLICATION
Whole body - weight-bearing MRI - position imaging (flexion, extension, bending, standing, sitting and recumbent scanning)
CONFIGURATION
Front-open and Top-open MRI
Solenoid ("Wrap-around") and planar RF receiver coils
SINGLE/MULTI SLICE
0.1 sec per slice
MULTISLICE
0.1 sec per slice
Min. 6.0 cm
Min. 0.8 mm (3DFT)
MEASURING MATRIX
128 - 512
MAGNET TYPE
Iron-frame electromagnet
45.72 cm horizontal
POWER REQUIREMENTS
380/400/415/440/480 V
COOLING SYSTEM TYPE
Water, closed-loop
CRYOGEN USE, L/hr
-
STRENGTH
12 mT/m
5 GAUSS FRINGE FIELD, radial/axial
active, passive
spacer

• View the DATABASE results for 'Upright™ MRI' (5).Open this link in a new window


• View the NEWS results for 'Upright™ MRI' (9).Open this link in a new window.
 
Further Reading:
  Basics:
Product Information - Fonar Corporation
  News & More:
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    
FONAR Wins The Wall Street Journal Technology Innovation Award For 2007 For the FONAR UPRIGHT™ Multi-Position™ MRI
Monday, 1 October 2007   by www.fonar.com    
MRI Resources 
Non-English - MRCP - General - Diffusion Weighted Imaging - Artifacts - Jobs
 
previous      16 - 20 (of 472)     next
Result Pages : [1 2 3 4 5 6]  [7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... ]
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

MR-TIP    
Community   
User
Pass
Forgot your UserID/Password ?    



MRI is trending to low field magnets :
reduced costs will lead to this change 
AI will close the gap to high field 
only in remote areas 
is only temporary 
never 

Look
      Ups





MR-TIP.com uses cookies! By browsing MR-TIP.com, you agree to our use of cookies.

Magnetic Resonance - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • Medical-Ultrasound-Imaging • 
Copyright © 2003 - 2024 SoftWays. All rights reserved. [ 28 March 2024]
Terms of Use | Privacy Policy | Advertising
 [last update: 2024-02-26 03:41:00]