Presentation on theme: "Introduction to MRI Magnetic Resonance Imaging. Bore 1.5-3.0 Tesla Super conductive Magnet, RF coils."— Presentation transcript:
Introduction to MRI Magnetic Resonance Imaging
Bore Tesla Super conductive Magnet, RF coils
Understanding and Reading MRIs
How is this MRI Image produce?
Transforming Radio Frequencies into Images? Let’s step back, and look at a device that is familiar to all of us…the Radio
Encoded RF “1060 on your dial” RF decoded
X / 5mm slice of tissue
Setting up the Machine
Reading the Images
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.
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
T1 and T2 relaxation times Occur simultaneously and independently of each other and form the basis of tissue contrast in MR- reconstructed images
T1 Low TR ( 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)
Basic Sequences T1 to view anatomy T2 to detect a pathologic process (edema, swelling) Proton Density (PD) great for ligamentous anatomy