Magnetic Resonance Vascular Imaging

Outline

Mind Map

Learning Objectives

Teaching Visuals

Online Module
(Requires Enrollment)

Text Reference

 

Outline and Learning Guide


INTRODUCTION AND OVERVIEW

TIME EFFECTS

Flow-Related Enhancement (Bright Blood)

Flow-Void Effect (Black Blood)

SELECTIVE SATURATION

PHASE EFFECTS

Intravoxel Phase

Flow Dephasing

Flow Compensation

Even-Echo Rephasing

Intervoxel Phase

Phase Imaging

Artifacts

ANGIOGRAPHY

Phase Contrast Angiography

Velocity

Flow Direction

In-Flow Contrast Angiography

Three-Dimension (3-D) Volume Acquisition

Two-Dimension (2-D) Slice Acquisition

Image Format

Maximum Intensity Projection (MIP)

Surface Rendering

Contrast Enhanced Angiography

MIND MAP and SUMMARY

 

 

Learning Objectives

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  • Describe and illustrate how the flow-related enhancement effect produces bright blood in images.
     

  • Describe and illustrate how the flow-void effect produces bright blood in images.
     

  • Describe and illustrate how the technique of selective saturation is used to produces bright blood in images.
     

  • Describe the concept of inter-voxel phase and explain it's significance in MR imaging.
     

  • Describe the concept of intra-voxel phase and explain it's significance in MR imaging.
     

  • Give a general explanation of why both inter-voxel and intra-voxel dephasing occurs in flowing blood.
     

  • Describe the technique of flow compensation and when it might be used in MR imaging.
     

  • Briefly describe the concept of even-echo rephasing and how it's effect might be observed in an image
     

  • Briefly describe the process of phase imaging and the characteristic of flowing blood that is displayed in the image.
     

  • Name three specific imaging methods that can be used to produce angiography images with MRI.
     

  • Describe and illustrate the general concept of phase contrast angiography and how it produces images of flowing blood.
     

  • Describe and illustrate the general concept of phase subtraction as used in phase contrast angiography.
     

  • Describe and illustrate the significance and use of the "set velocity" protocol factor used in phase contrast angiography.
     

  • Describe and illustrate the general method of in-flow contrast angiography and how it produces bright-blood images.
     

  • Describe and illustrate the technique of a 3-D volume acquisition for MR angiograms.
     

  • Explain the advantages and disadvantages of the 3-D volume acquisition method for MR angiograms.
     

  • Describe and illustrate the technique of a 2-D slice acquisition for MR angiograms.
     

  • Explain the advantages and disadvantages of the 2-D slice acquisition method for MR angiograms.
     

  • Describe the technique of maximum intensity projection (MIP) and how it is used in MR angiography.
     

  • Briefly describe the contrast enhanced angiography method and some of its advantages over the in-flow and phase methods.

     

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    Text Reference

    Chapter 1

    Magnetic Resonance Imaging: Principles, Methods, and Techniques
    Medical Physics Publishing,  http://www.medicalphysics.org

     

     

    Mind Map