CHE113PATHOLOGY8

CHE113PATHOLOGY8 - CHE113 Forensic Science Nicolas Canel...

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CHE113 Forensic Science Nicolas Canel Forensic Pathology Biomedical Imaging •X-ray •Ultrasound •CT •MRI Magnetic Resonance Spectroscopy NMR (MRI) •Visualize soft tissue by measuring proton (nuclear) magnetic alignments relative to an external magnetic field. Electron Spin •Electrons have spin properties (spin along axis). Experimental Electron Spin •Passing an atomic beam (neutral atoms) which contained an odd number of electrons (1 unpaired electron, see later) through a magnetic field caused the beam to split into two spots. •Showed the possible states of the single (unpaired) electron as quantized into m s = + 1 / 2 or - 1 / 2 . Nuclear Spin •Like electrons, nuclei spin and because of this spinning of a charged particle (positively charged), it generates a magnetic field. Two states are possible for the proton ( 1 H). Magnetic Resonance Imaging MRI •Hydrogen atom has two nuclear spin quantum numbers possible (+ 1 / 2 and - 1 / 2 ). •When placed in an external magnetic field,
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This note was uploaded on 03/01/2012 for the course CHE 113 taught by Professor Spencer during the Spring '08 term at Syracuse.

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CHE113PATHOLOGY8 - CHE113 Forensic Science Nicolas Canel...

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