Solid state radiation detection panel having tiled photosensitive detectors arranged to minimize edge effects between tiles

• US 5,545,899 A
• Filed: 03/27/1995
• Issued: 08/13/1996
• Est. Priority Date: 12/06/1993
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Kim, Choon-Woo, Pai, Joseph Y., Tran, Nang T.
• Primary Examiner(s): Hannaher, Constantine
• Application Number:
  US08/410,773
• Time in Patent Office: 505 Days
• Field of Search: 250/370.09, 250/370.11, 250/332, 257/444, 257/443
• US Class Current: 250/370.09
• CPC Class Codes: G01T 1/20182 Modular detectors, e.g. tiled scintillators or tiled photodiodes stacked detectors G01T1/20181
• CPC Class Codes: G01T 1/20184 Detector read-out circuitry, e.g. for clearing of traps, compensating for traps or compensating for direct hits
• CPC Class Codes: G01T 1/2019 Shielding against direct hits
• CPC Class Codes: H01L 27/146 Imager structures

Abstract

A solid state radiation detection panel adapted to receive radiation, having a plurality of modules positioned immediately adjacent each other, with each of the plurality of modules having an array of photosensitive detectors arranged in a plurality of rows and columns, each of the photosensitive detectors having a radiation sensitive area; and circuit means for selectively addressing one of the photosensitive detectors by addressing one of the plurality of rows and one of the plurality of columns and reading the output of the one of the array of photosensitive detectors where each of the plurality of modules being arranged in a three dimensional structure in which the array of photosensitive detectors is arranged on a planar first surface of the module covering substantially the entire area of the planar first surface. The circuit means is located within the module in an area away from the planar first surface opposite from the received radiation. Photosensitive detectors located along an edge of the module having non-radiation sensitive circuitry located opposite the edge from the radiation sensitive area. The radiation sensitive area of the edge photosensitive detectors are smaller than the radiation sensitive area of the inside photosensitive detectors and the center to center distance of the radiation sensitive area of adjacent photosensitive detectors is maintained substantially constant between adjacent edge photosensitive detectors as adjacent inside photosensitive detectors. The module further has a pin diode along the edge of the module.

Claims

1. A solid state radiation detection panel adapted to receive radiation on a first surface, comprising:

a common substrate;

a plurality of modules, each of said plurality of modules formed on a silicon wafer comprising;

an array of photosensitive detectors arranged in a plurality of rows and a plurality of columns, each of said photosensitive detectors having a radiation sensitive area and producing an output; and

circuit means distributed within each of said plurality of modules for selective addressing one of said photosensitive detectors by addressing one of said plurality of rows and one of said plurality of columns and reading said output of said one of said array of photosensitive detectors;

each of said plurality of modules being arranged in a three dimensional structure in which said array of photosensitive detectors are arranged on a first surface of each of said plurality of modules covering substantially the entire area of said first surface, in which said circuit means is located within said module in an area away from said first surface opposite from said received radiation and wherein said plurality of modules of said solid state radiation detection panel are positioned immediately adjacent each other resulting in a near contiguous radiation sensitive area over the entire surface of said solid state radiation detection panel receiving said radiation;

panel addressing means for selectively addressing one of said photosensitive detectors in each of said plurality of modules by addressing said circuit means within each of said plurality of modules;

panel reading means for selectively reading the output of said one of said array of photosensitive detectors in each of said modules; and

interconnection means positioned between said plurality of modules and said common substrate for connecting said circuit means of each of said plurality of modules to said panel addressing means and to said panel reading means, respectively.

2. A solid state radiation detection panel as in claim 1 which further comprises a layer of phosphor positioned between said radiation sensitive area of said modules and said received radiation.

3. A solid state radiation detection panel as in claim 1 wherein said panel addressing means and said panel reading means are located opposite said common substrate from said plurality of modules.

4. A solid state radiation detection panel as in claim 3 wherein said interconnection means comprises:

a plurality of electrical contacts located between said common substrate and said plurality of modules, said plurality of electrical contacts making electrical contact with said circuit means within each of said plurality of modules; and

a flexible cable connecting said plurality of electrical contacts with said panel addressing means and said panel reading means.

5. A solid state radiation detection panel as in claim 4 wherein said plurality of electrical contacts are a plurality of electrically conductive tracks placed on said common substrate and wherein the number of said electrically conductive tracks is substantially fewer than the number resulting from a multiplication of the number of rows and the number of columns of said solid state radiation detection panel.

6. A solid state radiation detection panel as in claim 5 wherein the number of said electrically conductive tracks is at least an order of magnitude less than the number resulting from a multiplication of the number of rows and the number of columns of said solid state radiation detection panel.