Technique for obtaining sub-pixel spatial resolution and corrected energy determination from room temperature solid state gamma and X-ray detectors with segmented readout

US6002741A · kind A · utility

Assignee

• The State of Israel, Atomic Energy Commission, Soreq nuclear Research Center · IL

Inventors

• Yosef Eisen · Nes Ziona, IL
• Asher Shor · Jerusalem, IL

Key dates

• Filing date: Dec 17, 1997
• Grant date: Dec 14, 1999
• Expiry date: Dec 17, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G01T1/2928
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and apparatus for obtaining the planar location with sub-pixel resolution and corrected energy of a gamma or X-ray photon interacting with a room temperature solid state detector of given thickness. The detector comprises two electrodes of negative and positive polarities. One of the electrodes is common, and the other is segmented being formed with segmented readout elements. Each of the readout elements defines a pixel size. Depending on that the negative or positive electrode is segmented, respectively, negative-induces charge signals are induced on the readout elements or both a positive-induced charge signal is induced on a central readout element and negative-induced charge signals are induced on adjacent readout elements. Accordingly, respective induced-charge signals are simultaneously measured and statistically correlated on the respective readout elements with detector response templates so as to obtain a best fit template, thereby determining the photon's energy, location and depth of interaction.