Radiant energy – Calibration or standardization methods
Reexamination Certificate
2006-09-15
2009-12-15
Porta, David P (Department: 2884)
Radiant energy
Calibration or standardization methods
C250S370110
Reexamination Certificate
active
07633057
ABSTRACT:
A scintillator (18) includes radioactive elements which emit radiation of a characteristic energy, such as lutetium176, which emits 202 keV and 307 keV γ-rays. The scintillators have light output levels that vary and photomultiplier tubes that respond to the light scintillations tend to drift. When a scanner (10) is not generating diagnostic images, the photomultiplier tubes detect scintillations from the lutetium 176 radiation. A self-calibration processor (40) adjusts the gain for each photomultiplier tube such that its output peak corresponds to 202 keV or 307 keV and adjusts a scaling factor for PMT outputs corresponding to each scintillator such that the output peaks have a common amplitude.
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Cooke Steven
Laurence Thomas
Koninklijke Philips Electronics , N.V.
Porta David P
Taningco Marcus H
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