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Introduction to MRI

Introduction to MRI. M agnetic R esonance I maging. Bore 1.5-3.0 Tesla Super conductive Magnet, RF coils. Understanding and Reading MRIs. How is this MRI Image produce?. Numbers. Transforming Radio Frequencies into Images?.

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Introduction to MRI

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  1. Introduction to MRI • Magnetic • Resonance • Imaging

  2. Bore 1.5-3.0 Tesla Super conductive Magnet, RF coils

  3. Understanding and Reading MRIs

  4. How is this MRI Image produce?

  5. Numbers

  6. Transforming Radio Frequenciesinto Images? Let’s step back, and look at a device that is familiar to all of us…the Radio

  7. Encoded RF “1060 on your dial” RF decoded

  8. X 1021 / 5mm slice of tissue

  9. Setting up the Machine

  10. Surface coil

  11. Reading the Images

  12. The emitted energy of the protonsonce the RF is stopped is affected by in which tissue (the “lattice”) it resides: fat, muscle, ligament, bone, brain, etc.

  13. RF Pulse sequence parameterswhich the technician adjusts • The three pulse sequence parameters are • Repetition time (TR) measured in msec • Echo time (TE) measured in msec • Flip angle measured in degrees

  14. T1 and T2 relaxation times Occur simultaneously and independently of each other and form the basis of tissue contrast in MR-reconstructed images

  15. T1 • Low TR (400-700 msec) • Low TE (20-40 msec) • T2 • High TR (2,000-3,000 msec) • High TE (40-70 msec) • Proton density • High TE (2,000-3,000msec) • Low TE (20-40 msec)

  16. Basic Sequences • T1 to view anatomy • T2 to detect a pathologic process (edema, swelling) • Proton Density (PD) great for ligamentous anatomy

  17. Basic Pulse Sequences for MRI Imaging

  18. Fat Suppression A very valuable tool to define whether a structure is composed of water (bright) such as blood or fat (bone marrow)

  19. TI Fat Water

  20. T2 Fat Water

  21. T2 Fat Suppressed Fat Water

  22. Proton Density Fat Suppressed (PD-S) FAT Water

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