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PhonForum -
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A logarithmic measure of sound loudness closely related to the decibel. The unit decibel is used for objective measurements, that means, they measure the actual pressure of the sound waves as recorded using a microphone. The unit phon is used for subjective measurements, that means, measurements made using the ears of a human listener.
A sound has the loudness 'p' phon if it seems to the listener to be equal in loudness to the sound of a pure tone of the frequency 1 kilohertz and strength 'p' decibel. A measurement in phons will be similar to a measurement in decibel, but not identical, since the perceived loudness of a sound depends on the distribution of frequencies in the sound as well as the pressure of the sound waves. In the U.S., sound loudness is frequently measured in sones rather than phons: a sound of loudness 's' sones has loudness 10 log2 s + 40 phons.
See also Acoustic Noise.
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MAGNETOM Symphony™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
From Siemens Medical Systems;
www.med.siemens.com/med/d/gg/mr/products/symphony1.html with the introduction of this system, it is possible to perform contrast MR angiography for abdominal, thoracic and neck vessels from the origins to the circle of Willis. The system also has many newer features including functional imaging, spectroscopy, advanced body, ortho- and neuroimaging.

Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Compact
SURFACE COILS Body, head, spine, knee, neck, TMJ, extremity, breast, shoulder, others
SPECTROSCOPY Yes/SVS or CSI opt.
SYNCHRONIZATION ECG/peripheral, respiratory gating
PULSE SEQUENCES GRE, IR, FIR, STIR, TrueIR/FISP, FSE, FLAIR, MT, SS-FSE, MT-SE, MTC, MSE, EPI, GMR, fat/water sat./exc.
IMAGING MODES Single, multislice, volume study, multi angle, multi oblique
TR 2.4 msec std.; 2.0 opt.; 1.8 w/30 mT/m at 256matrix
TE 1.1 msec std.; 0.9 opt.; 0.78 w/30 mT/m at 256matrix
SINGLE/MULTI SLICE 178 images/sec at 256 x 256 at 100% FOV
FOV 0.5 cm - 50 cm
SLICE THICKNESS Min 2D/3D: 0.1/0.05 mm
DISPLAY MATRIX 1024 x 1024 full screen display
MEASURING MATRIX 64 x 64 to 1024 x 1024
PIXEL INTENSITY
SPATIAL RESOLUTION 21 micrometer in plane, 11 micrometer optional
MAGNET TYPE Superconducting, single cryogen
BORE DIAMETER
or W x H
60 cm
MAGNET WEIGHT 4050kg, 5500kg in operation
H*W*D 236 x 215 x 160 cm w/covers
POWER REQUIREMENTS 380/400/420/440/480 V
COOLING SYSTEM TYPE Single cryogen, 2 stage refrig.
CRYOGEN USE Liquid He
FIELD STRENGTH 1.5 T
STRENGTH 20/35 mT/m standard, 30/52 opt.
5-GAUSS FRINGE FIELD 2.5 m / 4.0 m
SHIMMING Passive, act.; 1st order std./2nd opt.
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Further Reading:
  Basics:
Symphony Brochure(.pdf)
MRI Resources 
Open Directory Project - Jobs - Pacemaker - Diffusion Weighted Imaging - RIS - Quality Advice
 
Acoustic Noise
 
Vibrations of the gradient coil support structure create sound waves. These are caused by the interactions of the magnetic field created by pulses of the current through the gradient coil with the main magnetic field in a manner similar to a loudspeaker coil. The sounds made by the scanner vary in volume and tone with the type of procedure being performed.
Sound pressure is reported on a logarithmic scale called sound-pressure level, expressed in decibel (dB) referenced to the weakest audible 1 000 Hz sound pressure of 2*10-5 pascal (20 micropascal). Sound level meters contain filters that simulate the ear's frequency response. The most commonly used filter provides what is called 'A' weighting, with the letter 'A' appended to the dB units, i.e. dBA.
MRI system noise levels increase with field strength. Disposable earplugs and/or headphones for the patient are recommended in high-field systems. Noise-canceling systems and special earphones are available, and active acoustic control systems were developed, e.g. softtone, pianissimo. A sequence with low noise gradient pulses is also called 'whisper sequence'.
See also Phon and Decibel.
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Further Reading:
  Basics:
MRI Noise in Utero Not Harmful for Baby's Ears
Tuesday, 28 September 2010   by www.medgadget.com    
  News & More:
Noise from Magnetic Resonance Imaging Can Have Short-Term Impact on Hearing
Thursday, 22 February 2018   by www.diagnosticimaging.com    
Echo Planar Imaging at 4 Tesla With Minimum Acoustic Noise(.pdf)
   by www.bnl.gov    
GE Healthcare unveils Silent Scan MRI for patient comfort
Friday, 25 October 2013   by www.pharmabiz.com    
TOSHIBA SHOWCASES PATIENT-FRIENDLY 3T MR SYSTEM
Sunday, 29 November 2009   by medical.toshiba.com    
Searchterm 'Phon' was also found in the following services: 
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Bornhop Research GroupMRI Resource Directory:
 - Research Labs -
 
www.orgs.ttu.edu/bornhopslab/contact/index.html

Texas-based university research group. Current projects include: 'Multi-Modal Molecular Imaging Agents' or 'Micro-Fluidics and Nanosensing'. For example, the research group is evaluating Ln-PK-11195 as a bimodal imaging contrast agent for brain cancer detection by MRI and fluorescence.
Please see their Current Projects Abstracts for complete coverage.


Contact Information
MAIL Bornhop Research Group
MS 1061 Dept of Chemistry and Biochemistry
Texas Tech University
Lubbock, TX 79409
USA
PHONE Office Phone: +1-806-742-3142
Lab Phone: +1-806-742-3152
FAX +1-806-742-1289
E-MAIL darryl.bornhop@ttu.edu
ONLINE www.orgs.ttu.edu/bornhopslab/index.html

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Siemens Medical Systems
 
www.siemensmedical.com The range of diagnostics and imaging systems of Siemens Medical Systems covers ultrasound, nuclear medicine, angiography, magnetic resonance, computer tomography and patient monitoring. Siemens is one of the three leading MRI manufacturers, which together account for approximately 80 percent of the MRI machines installed worldwide. Siemens currently offers the Allegra 3T MRI, which is for MRI, a 3T whole body scanner.
Siemens has formed partnerships with more than ten research institutions and private practitioners to define a comprehensive MRI examination and compare MR to currently established cardiovascular modalities, thereby defining optimal diagnosis and treatment.

MRI Scanners:
– 0.2T to 1.0T:
•
MAGNETOM Concerto™
•
MAGNETOM Jazz™
•
MAGNETOM C™
•
MAGNETOM Harmony™
•
MAGNETOM Rhapsody™
– 1.5T:
•
MAGNETOM Aera
•
MAGNETOM Avanto™
•
MAGNETOM Espree™
•
MAGNETOM ESSENZA
•
MAGNETOM Sonata™
•
MAGNETOM Symphony™
– 3.0T to 7.0T:
•
MAGNETOM Allegra™
•
MAGNETOM Prisma
•
MAGNETOM Skyra
•
MAGNETOM Spectra
•
MAGNETOM Verio
•
MAGNETOM Trio™
•
MAGNETOM 7T
– Hybrid Scanners:
•
Biograph mMR
– Mobile Solutions:
MAGNETOM Espree 1.5T, MAGNETOM Avanto 1.5T and MAGNETOM ESSENZA 1.5T are also offered by Siemens on certified trailers.



Contact Information
MAIL Siemens Medical Solutions Health Services Corporation
51 Valley Stream Parkway
Malvern, PA 19355
USA
PHONE +1 610 219 6300
FAX +1 610 219 8266
E-MAIL contact@med.siemens.de
ONLINE siemensmedical.com
CONTACT INFO PAGE worldwide.med.siemens.com/contact
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Further Reading:
  Basics:
New 3-tesla MRI scanner Magnetom Prisma from Siemens is designed to explore new frontiers in MRI application
Sunday, 25 November 2012   by www.siemens.com    
Siemens Announces FDA Clearance of Magnetom Amira MRI Scanner
Thursday, 21 January 2016   by www.itnonline.com    
  News & More:
The Most Exciting Equation in MRI Siemens MAGNETOM Verio Combines High-Field Imaging and a 70-cm Open-Bore Design
Wednesday, 31 October 2007   by www.biospace.com    
Siemens Working on Automated Planning of Cardiac MRI Views
Friday, 8 March 2013   by www.medgadget.com    
MRI Resources 
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