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Virtual Dictionary

Positron Emission Tomography

PET or Positron Emission Tomography is another 3D imaging technique for living organic beings. It produces a three-dimensional image or picture of functional processes in the body in a similar fashion to SPECT systems. Essentially, it slices the body into tens of thousands of slides using gamma rays. These can then be stacked together to create a 3D rendition.

The gamma irradiator is run down the body from multiple angles such that each slice of the body is captured from multiple vantage points, typically only a few degrees apart.

Where PET differs from SPECT is that in SPECT the gamma emissions are read directly, after they pass through the body. With PET, imaging is performed via tracers inside the body which absorb the radiation, and emit it back, from within the body. These tracers are sometimes ingested, sometimes injected into the bloodstream directly. Eventually they pass out of the body on their own.


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Positron Emission Tomography



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Fast Adaptive Optics for 3D Medical Imaging
One of the greatest problems with tomography based medical scanners, is what happens when the patient moves (breathes, or pumps blood). The distortion that occurs in each slice has long been correctable, but takes a long time to correct. With near-instant correction now possible, real-time medical scanning is starting to look like a true possibility.


Industry News containing the Term Positron Emission Tomography:

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A new study published in the September issue of The Journal of Nuclear Medicine shows that positron emission tomography (PET)/computer tomography (CT) scans with the imaging agent choline could detect recurring prostate cancer sooner than c...

Research published in the October 2009 issue of the Journal of Thoracic Oncology has found an effective combination of positron emission tomography (PET)/computed tomography (CT) (PET/CT) tests to diagnose lung cancer in a "fast-tracked" ...

UCLA scientists have used innovative brain-scan technology developed at UCLA, along with patient-specific information on Alzheimer's disease risk, to help diagnose brain aging, often before symptoms appear. Published in the January issue o...

A series of novel imaging agents could make it possible to "see" tumors in their earliest stages, before they turn deadly.

The compounds, derived from inhibitors of the enzyme cyclooxygenase-2 (COX-2) and detectable by posi...

A technique that uses light-activated proteins to stimulate particular brain cells and positron emission tomography (PET) scans to trace their effects throughout the entire brain of fully-awake, moving animals has been developed by U.S. Dep...