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Absorption Mode
 
Component of the signal that yields in a symmetric, positive-valued line shape.
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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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• View the DATABASE results for 'Acoustic Noise' (9).Open this link in a new window

 
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    
MRI Resources 
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Acquisition Matrix
 
The total number of independent data samples in the frequency and phase directions (number of pixels in the frequency encoding - and phase encoding direction).
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• View the DATABASE results for 'Acquisition Matrix' (12).Open this link in a new window

 
Further Reading:
  News & More:
Sharpening MRI Images
Sunday, 1 December 2013   by www.onlinetmd.com    
NIST Calibration Tools to Encourage Use of Novel Medical Imaging Technique
Tuesday, 3 December 2013   by www.hispanicbusiness.com    
Acquisition Time
 
The amount of time necessary to collect all of the data for a particular sequence. This time does not include the time necessary to reconstruct the image.
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• View the NEWS results for 'Acquisition Time' (2).Open this link in a new window.

• View the DATABASE results for 'Acquisition Time' (24).Open this link in a new window

 
Further Reading:
  News & More:
Reducing acquisition time for MRI-based forensic age estimation
Friday, 19 January 2018   by www.nature.com    
FDA Clears Compressed Sensing MRI Acceleration Technology From Siemens Healthineers
Tuesday, 21 February 2017   by www.healthimaging.com    
Real-time MRI: recent advances using radial FLASH
Wednesday, 4 April 2012   by www.futuremedicine.com    
AcquisitionsForum -
there are related threads
 
The process of measuring and storing image data.
See also Acquisition Matrix, Acquisition Time.
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• View the DATABASE results for 'Acquisitions' (16).Open this link in a new window

 
Further Reading:
  Basics:
Optimal k-Space Sampling for Dynamic Contrast-Enhanced MRI with an Application to MR Renography
Thursday, 5 November 2009   by www.ncbi.nlm.nih.gov    
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 www.ajronline.org    
MRI Resources 
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