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15min teaching demo for consideration as an adjunct professor at a local University
This document compares MRI and CT scanning modalities. It discusses the basic anatomy of image planes for both modalities. CT uses X-rays to acquire fast, accurate images suited for bone, lungs, vessels and calcifications, while MRI uses magnetic fields and radio waves to acquire soft tissue images in any plane, but requires longer scan times and is more sensitive to motion. Both modalities have limitations for certain applications and imaging certain anatomies.
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15min teaching demo for consideration as an adjunct professor at a local University
- 1. MRI vs CT TheDifferences of these modalities and which one is best suited
- 2. Basic Anatomy ofviewing plane • The Image Planes • Axial (Cross-section) • Slice of bread • either direction • Sagital (Midline) • Left <-> Right • Coronal (Horizontal) • Front <-> Back
- 3. Computerized Axial Tomography • TheMechanics • Tomography - one direction of motion, various focal planes. • Axial Tomo - One dynamic motion coupled with movement of subject.
- 4. Computerized Axial Tomography • Cross-sectionalimaging using X-Rays • Acquires images extremely fast (mSec) • Accuracy to 1mm (thin slices) • SNR - low • Motion sensitivity - low • Fast Image reconstructions
- 5. Computerized Axial Tomography • Greatfor imaging: • Bone • Lung • Calcifications • Heart • Vessels (Arterial & Venous) • Soft Tissue (with vessels) • 3D reconstructions
- 6. Computerized Axial Tomography • Limitationsand Risks: • Not good for Pregnancy, Kids, Sensitive Tissue (Post RTX) • Contrast needed for imaging vessels, but low probability to cause Nephrological Toxicity • Weight limit of 400-450 lbs
- 7. Magnetic Resonance Imaging • TheMechanics • Super-Conductor • Helmholtz Coil
- 8. Helmholtz Coil Hermann vonHelmholtz (1821-1894) German scientist and philosopher who made fundamental contributions to physiology, optics, electrodynamics, mathematics, and meteorology. Helmholtz Coils A pair of conducting circular coils each having N turns, each carrying a current I, separated by a distance equivalent to the radius of the circular loops, produce a homogeneous magnetic field B in the mid-plane between the two circular coils. a = radius of the coils a = separation between the coils a/2 = distance to the mid-plane B = magnetic field at the mid-plane
- 9. Magnetic Resonance Imaging • TheMechanics • Coils and Gradients • RF Transmitter & • Receivers
- 10. Magnetic Resonance Imaging • UsesMagnetic Fields and RadioFrequency devices for acquiring images • Imaging in any plane (X,Y,Z) • Image time varies significantly (30sec - 45min) • Very sensitive to Motion • Accuracy within 1.5mm (but with many compromises and only on specific Sequences) • Image reconstruction more time consuming
- 11. Magnetic Resonance Imaging • Greatfor Imaging: • Soft Tissue (more information than CT) • Ligaments, Tendons, Spinal Cord • Bone Tumors & minute abnormalities • Vessels
- 12. Magnetic Resonance Imaging • Limitationsand Risks: • Not good for Pacemaker, Aneurysm clips, Metal implants, Cochlear implants, etc. • High Anxiety component • Very sensitive to motion (time variant) • Weight limit 300-350 lbs • Not good for Lung or Heart Imaging • Contrast not always needed, but higher Nephrological Toxicity
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- 17. GE Head Coil GEKnee Coil (Solid)