introduction to mri
DESCRIPTION
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?. - PowerPoint PPT PresentationTRANSCRIPT
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Introduction to MRI• Magnetic
• Resonance
• Imaging
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Bore1.5-3.0 TeslaSuper conductive Magnet, RF coils
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Understanding and Reading MRIs
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How is this MRI Image produce?
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Numbers
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Transforming Radio Frequenciesinto Images?
Let’s step back, and look at a device that is familiar to all of us…the Radio
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Encoded RF “1060
on your dial”
RF decoded
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X 1021 / 5mm slice of tissue
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Setting up the Machine
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Surface coil
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Reading the Images
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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.
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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
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T1 and T2 relaxation times
Occur simultaneously andindependently of each other and formthe basis of tissue contrast in MR-reconstructed images
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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)
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Basic Sequences
• T1 to view anatomy
• T2 to detect a pathologic process (edema, swelling)
• Proton Density (PD) great for ligamentous anatomy
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Basic Pulse Sequences for MRI Imaging
Image type Fat Water Advantage
T1 Bright Dark Anatomical detail
T2 Intermediate Bright ++ edema
Fat Suppressed T2
Very Dark Very Bright ++++ edema
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Fat Suppression
A very valuable tool to define whether a structure is composed of water (bright)
such as blood or fat (bone marrow)
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TIFat
Water
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T2Fat
Water
Fat Water
Intermediate Bright
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T2 Fat Suppressed
Water
Fat
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Proton Density Fat Suppressed (PD-S)
FAT
Water