William H. Faulkner

Rad Tech's Guide to MRI (eBook, PDF)

Basic Physics, Instrumentation, and Quality Control

• Format: PDF

Produktbeschreibung

The second edition of Rad Tech's Guide to MRI provides practicing and training technologists with a succinct overview of magnetic resonance imaging (MRI). Designed for quick reference and examination preparation, this pocket-size guide covers the fundamental principles of electromagnetism, MRI equipment, data acquisition and processing, image quality and artifacts, MR Angiography, Diffusion/Perfusion, and more. Written by an expert practitioner and educator, this handy reference guide: * Provides essential MRI knowledge in a single portable, easy-to-read guide * Covers instrumentation and MRI hardware components, including gradient and radio-frequency subsystems * Provides techniques to handle flow imaging issues and improve the quality of MRIs * Explains the essential physics underpinning MRI technology Rad Tech's Guide to MRI is a must-have resource for student radiographers, especially those preparing for the American Registry of Radiation Technologist (ARRT) exams, as well as practicing radiology technologists looking for a quick reference guide.

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Produktdetails

• Verlag: John Wiley & Sons
• Erscheinungstermin: 6. Januar 2020
• Englisch
• ISBN-13: 9781119509486
• Artikelnr.: 58582987

Autorenporträt

William H. Faulkner, Jr. is a radiologic technologist and MRI education and operations consultant with William Faulkner and Associates. He is a founding board member of the American Board of Magnetic Resonance Safety (ABMRS) and author and co-author of several books on magnetic resonance imaging and computed tomography including the Handbook of MRI Technique and Review Questions for MRI.

Inhaltsangabe

1. Hardware Overview 1

Instrumentation: Magnets 1

Instrumentation: RF Subsystem 6

Instrumentation: Gradient Subsystem 8

2. Fundamental Principles 11

Electromagnetism: Faraday's Law of Induction 11

Magnetism 12

Behavior of Hydrogen in a Magnetic Field 14

3. Production of Magnetic Resonance Signal 19

4. Relaxation and Tissue Characteristics 23

T2-Relaxation 23

T1-Relaxation 24

Proton Density 24

T2* (Pronounced "T2 star") 25

5. Data Acquisition and Image Formation 27

Pulse Sequences 27

Image Contrast Control 30

Image Formation 42

Data Acquisition 43

Scan Time 50

Controlling Image Quality with FSE 57

6. Magnetic Resonance Image Quality 61

Spatial Resolution 61

Signal-to-Noise Ratio (SNR) 63

7. Artifacts 75

Chemical Shift (Water and Fat in Different Voxels) 75

Chemical Shift (Water and Fat in the Same Voxel) 77

Magnetic Susceptibility 79

Motion and Flow 81

Spatial Presaturation 82

Gradient Moment Nulling (Flow Compensation) 84

Compensation for Respiration 84

Cardiac Compensation 86

Aperiodic Motion 88

Aliasing 89

Gibbs and Truncation Artifact 91

Radio-Frequency Artifacts 92

Gradient Malfunctions 93

Image Shading 93

Inadequate System Tuning 94

Reconstruction Artifacts 94

8. Flow Imaging 97

Flow Patterns 97

Magnetic Resonance Angiography (Non Contrast) 98

Reduction of Flow Artifacts 102

Signal Loss in MRA 102

Two-Dimensional and Three-Dimensional Time-of-Flight 103

Signal Loss with Two-Dimensional TOF 104

Three-Dimensional TOF 106

Signal Loss with Three-Dimensional TOF 108

PC Techniques 109

Contrast Enhanced MRA (CE-MRA) 113

9. Diffusion and Perfusion Imaging 117

Diffusion-Weighted Imaging (DWI) 117

10. Gadolinium-Based Contrast Agents 125

Characteristics, Composition and Structure 125

Index 129