Energy and position sensitive radiation detectors

Details Energy and position sensitive radiation detectors Energy and position sensitive radiation detectors

1996-11-06

1998-07-21

Porta, David P.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250369, G01T 120

Patent

active

057838291

ABSTRACT:
A device and a method for determining the interaction position and energy measurement of a radiation detector. A plurality of waveshifting optical fiber are positioned on the surface of a scintillator which is subjected to incident radiation causing the release of photons of a first wavelength from the scintillator which are absorbed by the optical fiber with a portion of the released photons being reemitted from one end of the fibers. The reemitted photons are measured and the centroid of the distribution of these measured photons is determined in order to provide an indication of the interaction position of incident radiation. A measurement of photons generated by the incident radiation which pass through the fibers but which are not transported down said fibers provide an indication of the energy of the incident radiation. In a further embodiment, a crossed wire anode photomultiplier is used in conjunction with a plurality of scintillating fibers embedded in grooves on both sides of the scintillator in order to provide an accurate position for the centroid of a more extended distribution of incident photons. Furthermore a designed neural network extracts, from the crossed wire anode photomultiplier output pulses, a linear position to provide real time imaging.

REFERENCES:
patent: 4829185 (1989-05-01), Cerff
patent: 5103099 (1992-04-01), Bourdinaud et al.
patent: 5281820 (1994-01-01), Croh et al.
patent: 5506408 (1996-04-01), Vickers et al.
patent: 5600144 (1997-02-01), Worstell
"Development of a High-Resolution Pet Detector using LSO and Wavelength-Shifting Fibers"; William Worstell, Olof Johnson, and Valery Zawarzin; Boston University Physics Dept.; (5) pages. No date.
"Scintillator Crystal Readout with Wavelength-Shifting Optical Fibers"; William Worstell, Steven Doulas, Olof Johnson, and Cheng-Ju Lin; Boston University Physics Dept.; Mar. 1995; pp. 1869-1873.
"Position Sensitive.DELTA.E Detector"; D.V.H. Bengis and R.M. Sealock; Dept Of Physics, University of Virginia; Mar. 1995; pp. 574-578.

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