Depth-of-interaction and other high order moments filtering for

Details Depth-of-interaction and other high order moments filtering for Depth-of-interaction and other high order moments filtering for

1997-06-03

1998-09-29

Smith, Ruth S.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600436, 25036302, 25036303, 250369, A61B 600

Patent

active

058139834

ABSTRACT:
Radiation from a subject (18) which is received by a scintillation crystal (12) interacts with the scintillation crystal to produce a burst of scintillation light photons. The depth distribution at which the interaction occurs varies in accordance with the energy of the received radiation. Low-energy radiation tends to interact at a shallow depth relative to a front face of the scintillation crystal and radiation with a high energy tends to interact relatively deeply into the crystal. A moment processor (20) processes electronic information from photomultiplier tubes (14) which view the scintillation crystal to generate zero-th moment or energy information, first moment or coordinate information and second moment or depth information. The event information is filtered (34, 62, 66, 82) in accordance with depth (26), e.g., sorted into acceptable/unacceptable information, information corresponding to each of two or more energies of radiation, and the like.

REFERENCES:
patent: 5122667 (1992-06-01), Thompson
patent: 5576546 (1996-11-01), Gagnon
"Maximum Likelihood Positioning in the Scintillation Camera Using Depth of Interaction" Gagnon, IEEE Trans. on Med. Imaging, vol. 12 No. 1 Mar. 1993.
"Storage-Phosphor-Based Digital Mammography using a Low-Dose X-Ray System Optimized for Screen-Film Mammography", Jennings, et al. SPIE Vo. 2708 Feb. 1996.

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