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AttenuationForum -
there are related threads
Reduction of power, e.g. due to passage through a medium or electrical component. Attenuation in electrical systems is commonly expressed in dB.

• View the DATABASE results for 'Attenuation' (10).Open this link in a new window

Further Reading:
Techniques of Fat Suppression(.pdf)
Diffusion-Weighted MRI in the Body: Applications and Challenges in Oncology
Friday, 1 June 2007   by    
  News & More:
PET Attenuation Correction for Rigid MR Tx/Rx Coils From 176Lu Background Activity
Tuesday, 6 February 2018   by    
Audio Frequency ArtifactInfoSheet: - Artifacts -
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
Quick Overview

Artifact Information
NAME Audio frequency
DESCRIPTION Ghosting, lines or spots
REASON Wrong modulation at audio rate, wrong audio signal
HELP AC-line synchronization

Two types of audio-frequency problems are possible:

1. Modulation of the MR signal at an audio rate 2. Audio signal component at digitizer input
Problem 1 looks like ghosts, weak copies of the real image, displaced along the phase encoding direction. The number and intensity of the ghosts depends upon the relationship between the period of the audio modulation and the repetition time.
Problem 2 shows up as lines or spots at the appropriate points along the frequency direction. If there is no correlation between the audio period and TR, lines are generated or discrete spots occur.

Image Guidance
Both problems can be lessened by use of AC-line synchronization (line trigger).

MRI Resources 
Jobs pool - Diffusion Weighted Imaging - RIS - Spine MRI - Spectroscopy - Shielding
Aurora Imaging Technology, Inc. Aurora Imaging Technology, Inc., a private company, is located in North Andover, Massachusetts. As a leading innovator in the breast imaging industry, the company provides with its Aurora System the detection, diagnosis, biopsy and treatment of breast cancer. Aurora Imaging Technology Inc. develops and manufactures the Aurora® 1.5T Dedicated Breast MR System, the first and only FDA approved MRI system designed specifically for breast imaging.

MRI Related Product Lines:
Aurora® 1.5T Dedicated Breast MRI System

Contact Information
MAIL Aurora Imaging Technology Inc
39 High Street
North Andover, MA 01845
PHONE +1-877-975-7530

• View the NEWS results for 'Aurora Imaging Technology, Inc.' (5).Open this link in a new window.

• View the DATABASE results for 'Aurora Imaging Technology, Inc.' (2).Open this link in a new window

Aurora® 1.5T Dedicated Breast MRI SystemInfoSheet: - Devices -
Types of Magnets, 
Overview, etc.
From Aurora Imaging Technology, Inc.; The Aurora® 1.5T Dedicated Breast MRI System with Bilateral SpiralRODEO™ is the first and only FDA approved MRI device designed specifically for breast imaging. The Aurora System, which is already in clinical use at a growing number of leading breast care centers in the US, Europe, got in December 2006 also the approval from the State Food and Drug Administration of the People's Republic of China (SFDA).
'Some of the proprietary and distinguishing features of the Aurora System include: 1) an ellipsoid magnetic shim that provides coverage of both breasts, the chest wall and bilateral axillary lymph nodes; 2) a precision gradient coil with the high linearity required for high resolution spiral reconstruction;; 3) a patient-handling table that provides patient comfort and procedural utility; 4) a fully integrated Interventional System for MRI guided biopsy and localization; and 5) the user-friendly AuroraCAD™ computer-aided image display system designed to improve the accuracy and efficiency of diagnostic interpretations.'

Device Information and Specification
CONFIGURATION Short bore compact
COILS Breast transmit receive (TR) coil
IMAGING MODES Bi-lateral RODEO fat suppression, high resolution Rotating Delivery of Excitation Offresonance Spiral, integrated targeting SW compatible with major MR guided intervention equipment.
TR 10 ms for gradient echo and less than 2,500 ms for T2 weighted spin echo
TE From 5 ms for RODEO Plus to over 80 ms, 120 ms for T2 sequences
SINGLE/MULTI SLICE Around 0.02 sec for a 256x256 image, 12.4 sec for a 512 x 512 x 32 multislice set
FOV 20 - 36 cm, max. elliptical 36 x 44 cm
MAGNET TYPE Superconducting
or W x H
64 cm diameter (gantry)
H*W*D 240 x 188 x 163 cm
POWER REQUIREMENTS 150A/120V-208Y/3 Phase//60 Hz/5 Wire
COOLING SYSTEM Helium for magnet, distilled/de-ionized water for coil;
CRYOGEN USE Zero boil off rate

• View the NEWS results for 'Aurora® 1.5T Dedicated Breast MRI System' (3).Open this link in a new window.

• View the DATABASE results for 'Aurora® 1.5T Dedicated Breast MRI System' (2).Open this link in a new window

Further Reading:
AURORA MRI System® Site Planning Guide
  News & More:
Aurora Imaging Technology Announces Approval in China
Aurora Imaging Technology, Inc. Release: Results of a Multi-Center Trial Demonstrates Superior Diagnostic Performance of the Aurora® 1.5T Dedicated Breast MRI System Over Whole-Body Breast MRI
Monday, 1 October 2012   by    
Automatic Bolus DetectionInfoSheet: - Sequences -
Intro, Overview, 
Types of, 
Automatic bolus detection is used to trigger the begin of the MRI scan with the time the contrast agent reaches the region of interest. The acquisition process is started once the signal is increased in this region. There are similar methods used by the scanner manufacturer (see MRI Acronyms for Automatic Bolus Detection). After injection of the contrast agent the region of interest is monitored (e.g. with a spin echo or gradient echo sequence). When the signal increases the scan is automatically triggered or the operator is informed.
See also Abdominal Imaging, Bolus Injection, Fluoroscopic Triggering, Care Bolus, and Bolus Tracking.


• View the DATABASE results for 'Automatic Bolus Detection' (4).Open this link in a new window

Further Reading:
Fast Contrast Enhanced Imaging with Projection Reconstruction(.pdf)
  News & More:
Abdominal MR angio: fast, reproducible, and safe
MRI Resources 
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Acoustic Noise Reduction (Silent, Quiet, etc.) :
cannot get better 
is in its first steps 
is done by earplugs, headphones 
must get better 
is bad, I miss something 
is unnecessary 

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