When placed in an external magnetic field 1 h can

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•When placed in an external magnetic field, 1 H can either align with the field (“parallel” - lower energy) or against the field (“antiparallel” - higher energy). •Energy added (DE) can raise the energy level of an electron from parallel to antiparallel orientation (by absorbing radio frequency irradiation). •Electrons (also “magnets”) in “neighborhood” affect the value of DE (i.e., rocks in stream). •By detecting the DE values as a function of position within a body, an image of a body’s hydrogen atoms may be obtained. MRI •Advantages (first three are not really important for forensics) –non-invasive. –no ionizing or other “dangerous” radiation (such as X-rays of positrons).
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–Can be done frequently to monitor progress of treatment. –images soft tissues (only those with hydrogen atoms (almost all “soft” tissues). –images function through the use of contrast media. •Disadvantages –Relatively expensive equipment. Forensic MRI/CT •Used to reconstruct facial images from skulls. Use for ancient mummies to modern skulls.
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  • Spring '08
  • Spencer
  • Atom, Electron, Proton, Magnetic resonance imaging, Medical imaging, Magnetic Resonance Imaging MRI

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