# US 7,411,197 B2 · Three-dimensional, position-sensitive radiation detection

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- Number: US 7,411,197 B2
- Document ID: US7411197B2
- Status: Granted
- Kind: B2
- Application number: 11/240,404
- Filed: 2005-09-30
- Published: 2007-10-11
- Granted: 2008-08-12
- Earliest claimed: 2005-09-30
- Assignees: The Regents of the University of Michigan
- Inventors: Zhong He; Feng Zhang
- Web page: https://patentgrep.com/patent/US7411197B2

## CPC

- G01T 1/247: {Detector read-out circuitry (for processing gain or off-set correction H04N)}
- G01T 7/005: {calibration techniques (stabilization of spectrometer G01T1/40)}
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)

## Abstract

Disclosed herein is a method of determining a characteristic of radiation detected by a radiation detector via a multiple-pixel event having a plurality of radiation interactions. The method includes determining a cathode-to-anode signal ratio for a selected interaction of the plurality of radiation interactions based on electron drift time data for the selected interaction, and determining the radiation characteristic for the multiple-pixel event based on both the cathode-to-anode signal ratio and the electron drift time data. In some embodiments, the method further includes determining a correction factor for the radiation characteristic based on an interaction depth of the plurality of radiation interactions, a lateral distance between the selected interaction and a further interaction of the plurality of radiation interactions, and the lateral positioning of the plurality of radiation interactions.

## Claims

### Claim 1

A radiation detector for detecting a multiple-pixel event having a plurality of radiation interactions, the radiation detector comprising:
a first data processing module that generates electron drift time data from anode and cathode signals arising from the plurality of radiation interactions; and,
a second data processing module that accesses a first data correlation of electron drift times with cathode-to-anode signal ratios and a second data correlation of cathode-to-anode signal ratios with correction factor values for a radiation characteristic for the multiple-pixel event;
wherein the second data processing module determines the radiation characteristic based on the electron drift time data, the first data correlation and the second data correlation.

### Claim 2 (depends on 1)

The radiation detector of claim 1, wherein the second data processing module further determines an interaction depth for a selected radiation interaction of the plurality of radiation interactions based on the electron drift time data and the first data correlation.

### Claim 3 (depends on 2)

The radiation detector of claim 2, wherein the second data processing system further determines a distance between a first pixel of the radiation detector associated with the selected radiation interaction and a second pixel with which the radiation also interacts in the multiple-pixel event.

### Claim 4 (depends on 3)

The radiation detector of claim 3, wherein the second data processing system further accesses a third data correlation to determine a further correction factor for the radiation characteristic based on the interaction depth and the distance between the first and second pixels.

### Claim 5 (depends on 4)

The radiation detector of claim 4, wherein the third data correlation specifies values for the further correction factor based on lateral positioning of the first and second pixels.

### Claim 6 (depends on 5)

The radiation detector of claim 5, wherein the values for the further correction factor vary based on whether one or both of the first and second pixels are disposed along an anode periphery or within a central anode area.