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 B1          radio frequency field strength 
Searchterm 'B1' was found in the Abbreviation Register. 
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B1Forum -
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(B1, B1) A conventional symbol for the radio frequency field strength (another symbol historically used, is H1). In MRI, , B1 labels the field produced by the radio frequency coil.
The B1 field is often conceived of two vectors rotating in opposite directions, usually in a plane transverse to B0. At the Larmor frequency, the vector rotating in the same direction as the precessing spins will interact strongly with the spins.
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Further Reading:
  Basics:
Dealing with Increased MRI Field Strength
Tuesday, 1 October 2013   by www.evaluationengineering.com    
  News & More:
Implementation of Dual-Source RF Excitation in 3 T MR-Scanners Allows for Nearly Identical ADC Values Compared to 1.5 T MR Scanners in the Abdomen
Wednesday, 29 February 2012   by www.plosone.org    
Turbo-FLASH Based Arterial Spin Labeled Perfusion MRI at 7 T
Thursday, 20 June 2013   by www.plosone.org    
Mapping of low flip angles in magnetic resonance(.pdf)
Saturday, 1 January 2011   by www.hal.inserm.fr    
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H1
 
H1 is a conventional symbol historically used for the radio frequency magnetic field related to MRI;; today B1 is in use.
See B1.
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Further Reading:
  News & More:
High-field and Hybrid
Thursday, 6 March 2014   by www.european-hospital.com    
Nanometer-Scale Magnet Makes Tiny, Powerful MRI
Tuesday, 22 April 2014   by spectrum.ieee.org    
MRI Resources 
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Quadrupole ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview

Artifact Information
NAME Quadrupole artifact
DESCRIPTION Signal loss, intensity variations
REASON B1 disturbance
HELP STIR

Fat suppression (SPIR or FatSat) is very critical to the magnetic field homogeneity. Eddy currents in the patient results in B1 disturbance from left to right and from anterior to posterior. The artifact is seen as signal intensity variations with SPIR, like a signal intensity loss diagonal in the image. The short T1 inversion recovery (STIR) sequence is due to another type of fat suppression insensitive to this artifact.


Image Guidance
Take short T1 inversion recovery (STIR) instead spectral presaturation inversion recovery (SPIR) for fat suppression.
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Rotating Frame of Reference
 
A 'Rotating Frame of Reference' is a concept to simplify the complex motions of a magnetization vector. The frame of reference rotates about the axis of the external magnetic field B0 (z-axis) at the Larmor frequency of the applied RF magnetic field B1. In this simplified concept the rotating vector B1 appears stationary.
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Adiabatic Radio Frequency Pulses
 
Adiabatic RF pulses are amplitude and frequency modulated pulses that are insensitive to the effects of B1-inhomogeneity and frequency offset (conventional RF pulses used in MRI are only amplitude modulated). Due to an extended application time adiabatic RF pulses are mostly used in NMR imaging applications.
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In 2020 your scanner will probably work with a field strength of :
lower 
1T 
1.5T 
2T 
3T 
7T 
higher 

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