BME 314 Lecture 19 2010

BME 314 Lecture 19 - ReviewofMRI BiomedicalSensorsII Krish Roy PhD Associate Professor Biomedical Engineering Atoms shell of electrons and nuclei

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Review of MRI,  Biomedical Sensors II Krish Roy. PhD Associate Professor Biomedical Engineering
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Fundamental Principles of MRI: Atoms and magnetic fields Atoms shell of electrons and nuclei Atomic nuclei contains protons Protons are positively charged and are constantly spinning around an axis SPIN A positive charge spinning moving electrical charge What is this analogous to? What does this generate? So, how can you re-draw a proton?
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Fundamental Principles of MRI: Protons in an external magnetic field Protons little magnets Align themselves in an external magnetic field Alignment can be parallel to the external filed or anti-parallel The difference in the number of parallel and anti-parallel protons are very small 7 protons per 10 million
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Fundamental Principles of MRI: Precession of protons In a strong magnetic field, protons experience a motion similar to a spinning top hit by a small force PRECESSION 0 B γ ϖ= Precession frequency Magnetic field (Tesla)
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Coordinate system
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Fundamental Principles of MRI: Magnetic field cancellations
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Fundamental Principles of MRI: Patient as a magnetic vector
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Fundamental Principles of MRI: RF pulse to create transverse field
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Fundamental Principles of MRI: What are you detecting?
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This note was uploaded on 11/29/2010 for the course BME 314 taught by Professor Frey during the Fall '08 term at University of Texas at Austin.

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BME 314 Lecture 19 - ReviewofMRI BiomedicalSensorsII Krish Roy PhD Associate Professor Biomedical Engineering Atoms shell of electrons and nuclei

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