Basic Principles of MRI and MR Angiography



Magnetic resonance imaging (MRI) is a very versatile and useful imaging modality. It is capable of providing a wealth of diagnostic information, including information regarding blood flow. Magnetic resonance methods that provide images of the arteries are referred to as magnetic resonance angiography (MRA) methods. A variety of MRA methods exist. These methods can be categorized as noncontrast-enhanced and contrast-enhanced methods. The noncontrast-enhanced methods rely on the motion of blood (phase-contrast MRA, time-of-flight (TOF) MRA) or the magnetic properties of blood (steady-state free precession MRA) to differentiate signals from blood and stationary tissues, whereas contrast-enhanced methods require the intravenous injection of a contrast material to differentiate signals from blood and stationary tissues.


Magnetic Resonance Angiography Transverse Magnetization Magnetic Field Gradient Stationary Tissue Longitudinal Magnetization 


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Department of RadiologyUniversity of Wisconsin Hospital and ClinicsMadisonUSA

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