introduction to mri magnetic resonance imaging. bore 1.5-3.0 tesla super conductive magnet, rf coils

Download Introduction to MRI Magnetic Resonance Imaging. Bore 1.5-3.0 Tesla Super conductive Magnet, RF coils

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Introduction to MRI Magnetic Resonance Imaging Slide 2 Bore 1.5-3.0 Tesla Super conductive Magnet, RF coils Slide 3 Slide 4 Understanding and Reading MRIs Slide 5 How is this MRI Image produce? Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Numbers Slide 11 Transforming Radio Frequencies into Images? Lets step back, and look at a device that is familiar to all of usthe Radio Slide 12 Slide 13 Encoded RF 1060 on your dial RF decoded Slide 14 X 10 21 / 5mm slice of tissue Slide 15 Setting up the Machine Slide 16 Surface coil Slide 17 Slide 18 Reading the Images Slide 19 The emitted energy of the protons once the RF is stopped is affected by in which tissue (the lattice ) it resides: fat, muscle, ligament, bone, brain, etc. Slide 20 RF Pulse sequence parameters which 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 Slide 21 Slide 22 Slide 23 T1 and T2 relaxation times Occur simultaneously and independently of each other and form the basis of tissue contrast in MR- reconstructed images Slide 24 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) Slide 25 Basic Sequences T1 to view anatomy T2 to detect a pathologic process (edema, swelling) Proton Density (PD) great for ligamentous anatomy Slide 26 Basic Pulse Sequences for MRI Imaging Image typeFatWaterAdvantage T1BrightDark Anatomical detail T2 Intermediate Bright ++ edema Fat Suppressed T2 Very DarkVery Bright ++++ edema Slide 27 Slide 28 Slide 29 Fat Suppression A very valuable tool to define whether a structure is composed of water (bright) such as blood or fat (bone marrow) Slide 30 TI Fat Water Slide 31 T2 Fat Water FatWater IntermediateBright Slide 32 T2 Fat Suppressed Water Fat Slide 33 Proton Density Fat Suppressed (PD-S) FAT Water

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