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Searchterm 'Noise' was also found in the following services: 
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Double Inversion Recovery T1 MeasurementInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - Sequences -
 
(DIR or DIRT1) Double inversion recovery T1 measurement is a T1 weighted black blood MRA sequence in which the signal from blood is suppressed. The inversion time to suppress blood is described as the duration between the initial inversion pulse and time point that the longitudinal magnetization of blood reaches the zero point. The readout starts at the blood suppression inversion time (BSP TI) and blood in the imaging slice gives no signal. This inversion time is around 650 ms with a 60 beat per minute heart rate at 1.5 T.
The TI can be decreased by using a wider receive bandwidth, shorter echo train length and/or narrow trigger window. Wide bandwidth also decreases the blurring caused by long echo trains at the expense of signal to noise ratio. In case of in plane or slow flow the suppression of the signal from blood may be incomplete. With increased TE or change of the image plane the blood suppression can be improved.
Double inversion recovery is a breath hold technique with one image per acquisition used in cardiovascular imaging. The patient is instructed to hold the breath in expiration (if not possible also inspiration can be taken), so that the end diastolic volume in the cardiac chambers would be the same during entire scanning. DIR provides fine details of the boundary between the lumen and the wall of the cardiac chambers and main vascular and heart structures, pericardium, and mediastinal tissues.
 
Images, Movies, Sliders:
 Normal Dual Inversion Fast Spin-echo  Open this link in a new window
      

Courtesy of  Robert R. Edelman

 
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• Related Searches:
    • Saturation Pulses
    • Black Blood MRA
    • Prepulse
    • Heart MRI
    • Inversion Recovery
 
Further Reading:
  News & More:
Artificial double inversion recovery images can substitute conventionally acquired images: an MRI-histology study
Wednesday, 16 February 2022   by www.nature.com    
Searchterm 'Noise' was also found in the following services: 
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Radiology  (15) Open this link in a new windowUltrasound  (15) Open this link in a new window
Dynamic Range
 
The range of signal intensities that may need to be distinguished in an image or spectrum or that can be distinguished by the electronic components. If the signal dynamic range is too great, the need to keep the highest intensities from overloading the digitizer may result in the weaker features being lost in the digitization noise. This can be dealt with by using an analog to digital converter with a larger range of sensitivity or by using techniques to reduce the dynamic range, e.g. suppressing the signal from water in order to detect the signal from less abundant compounds.
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• View the DATABASE results for 'Dynamic Range' (7).Open this link in a new window

MRI Resources 
MRA - Process Analysis - Stimulator pool - Bioinformatics - Artifacts - Guidance
 
Exponential Weighting
 
Multiplication of the time-dependent signal data by an exponential function, exp(t/TC), where t is time and TC is a parameter called the time constant (in spectroscopy). The time constant can be chosen to either improve the signal to noise ratio (with a negative TC) or decrease the effective spectral line width (with a positive TC) in the resulting spectrum. The use of a negative TC to improve SNR is equivalent to line broadening by convolving the spectrum with a Lorentzian function of corresponding reciprocal width.
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• View the DATABASE results for 'Exponential Weighting' (2).Open this link in a new window

Searchterm 'Noise' was also found in the following services: 
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FONAR CorporationMRI Resource Directory:
 - Manufacturers -
 
www.fonar.com The company is a leading manufacturer and developer of magnetic resonance imaging (MRI) scanners. The Patient Friendly MRI Company, formed in 1978, is engaged in the business of inventing, manufacturing, selling and servicing magnetic resonance imaging (MRI) scanners. FONAR is the oldest MRI company in the world. After receiving hundreds of millions in a windfall from protecting their MRI patents, they made a MRI scanner that no other MRI manufacturer has. One that the patient stands in and they call Indomitable, the Stand-Up MRI. Patients like it because it is the least claustrophobic, most comfortable MRI on the market. Doctors like it because of its superior image quality and for the first time, the patient can be scanned in the weight-bearing position, or the position of pain or symptom. In October of 2004, the company changed the product name of the Stand-Up MRI to the Upright MRI. Fonar introduced the first "open" MRI scanner in 1980 and is the originator of the iron-core nonsuperconductive and permanent magnet technology.

MRI Scanners:

- 0.6T:
•
QUAD™ 12000 - Its 19-inch gap and Whisper Gradients™ make it extraordinarily spacious, quiet and comfortable. With its signal to noise advantage of 0.6 T and its comprehensive array of Organ-Specific™ receiver coils, the QUAD™ 12000 provides high-speed, high resolution and high contrast scanning. Product Specification
•
OR 360°™ - cleared for marketing by the FDA in March 2000, 360° access to the patient. A dual-purpose scanner, it can be used for conventional diagnostic scanning when not in surgical mode. Product Specification
•
Open Sky MRI™ - A dual purpose scanner for high-throughput scanning. Product Specification
•
Echo™ - open, comfortable, compact, reliable, easily sited and economical. Product Specification
•
Scanners in progress - Pinnacle™, a high-field superconducting Open MRI - mpExtremity MRI™, a small, in-office, weight-bearing MRI for extremities.


Contact Information
MAIL
FONAR Corporation
110 Marcus Drive
Melville, N.Y. 11747
USA
PHONE
+1-631-694-2929
FAX
+1-631-390-7766
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• View the DATABASE results for 'FONAR Corporation' (3).Open this link in a new window


• View the NEWS results for 'FONAR Corporation' (87).Open this link in a new window.
 
Further Reading:
  Basics:
FONAR Announces Fiscal 2014 Second Quarter Earnings Results
Friday, 14 February 2014   by www.twst.com    
  News & More:
Fonar Is An Unusual And Undervalued Play On The Obesity Epidemic
Monday, 8 December 2014   by seekingalpha.com    
MRI's inside story
Thursday, 4 December 2003   by www.economist.com    
Searchterm 'Noise' was also found in the following services: 
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Radiology  (15) Open this link in a new windowUltrasound  (15) Open this link in a new window
Fast Imaging with Steady PrecessionInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.
 
(TrueFISP) True fast imaging with steady state precession is a coherent technique that uses a fully balanced gradient waveform. The image contrast with TrueFISP is determined by T2*//T1 properties and mostly depending on TR. The speed and relative motion insensitivity of acquisition help to make the technique reliable, even in patients who have difficulty with holding their breath.
Recent advances in gradient hardware have led to a decreased minimum TR. This combined with improved field shimming capabilities and signal to noise ratio, has allowed TrueFISP imaging to become practical for whole-body applications. There's mostly T2* weighting. With the used ultrashort TR-times T1 weighting is almost impossible. One such application is cardiac cine MR with high myocardium-blood contrast. Spatial and temporal resolution can be substantially improved with this technique, but contrast on the basis of the ratio of T2* to T1 is not sufficiently high in soft tissues. By providing T1 contrast, TrueFISP could then document the enhancement effects of T1 shortening contrast agents. These properties are useful for the anatomical delineation of brain tumors and normal structures. With an increase in SNR ratio with minimum TR, TrueFISP could also depict the enhancement effect in myoma uteri. True FSIP is a technique that is well suited for cardiac MR imaging. The imaging time is shorter and the contrast between the blood and myocardium is higher than that of FLASH.

See Steady State Free Precession.
 
Images, Movies, Sliders:
 Cardiac Infarct 4 Chamber Cine 1  Open this link in a new window
    
 
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• View the DATABASE results for 'Fast Imaging with Steady Precession' (3).Open this link in a new window

 
Further Reading:
  Basics:
Accurate T1 Quantification Using a Breath-hold Inversion Recovery TrueFISP Sequence
2003   by rsna2003.rsna.org    
MRI Resources 
Image Quality - Jobs pool - Crystallography - Artifacts - Liver Imaging - Shielding
 
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