Dosimetry device for charged particle radiation

• US 8,044,364 B2
• Filed: 03/05/2007
• Issued: 10/25/2011
• Est. Priority Date: 09/08/2006
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Yamamoto, Yuichi
• Primary Examiner(s): Porta; David
• Assistant Examiner(s): Maupin; Hugh H
• Application Number:
  US11/713,698
• Publication Number:
  US 20080061245A1
• Time in Patent Office: 1,695 Days
• Field of Search: 250/374, 250/375, 250/378, 250/389
• US Class Current: 250/378
• CPC Class Codes: A61N 2005/1087 Ions; Protons
• CPC Class Codes: A61N 5/1075 for testing, calibrating, or quality assurance of the radiation treatment apparatus
• CPC Class Codes: G01T 1/02 Dosimeters G01T1/15 takes precedence

Abstract

A dosimetry device for charged particle radiation that can be exclusive of cables and connectors between substrates is provided. A plurality of first electrodes are formed on one surface of a printed circuit board, a second electrode substrate having a second electrode opposing each of the plurality of first electrodes through an ionized space is provided, and a signal processing circuit is provided on the other surface opposing the surface of the printed circuit board. The signal processing circuit includes at least one amplifying circuit, a plurality of integrating capacitors corresponding to the amplifying circuit for integrating charge at each corresponding one of the first electrodes, and at least one selector switch that switchably connects each of the integrating capacitors to the amplifying circuit. The printed circuit board may be a multi-layer printed circuit board.

Claims

1. A dosimetry device for charged particle radiation comprising:

a printed circuit board having one surface and other surface opposing to each other, the one surface including a central region, and the other surface including a first portion that overlaps the central region of the one surface and a second portion positioned out side of the first portion so as to not overlap the central region;

a plurality of first electrodes formed on the central region of the one surface of the printed circuit board;

a spacing frame disposed on the one surface of the printed circuit board to surround the central region of the one surface;

a second electrode substrate disposed on the spacing frame and having a second electrode opposing to each of the first electrodes through an ionized space; and

a signal processing circuit disposed on the other surface of the printed circuit board,

wherein the signal processing circuit includes a plurality of signal processing blocks each comprising;

a plurality of integrating capacitors, coupled to the plurality of first electrodes, for integrating charge at each of the first electrodes;

at least one amplifying circuit; and

at least one selector switch that switchably connects each corresponding one of the integrating capacitors to the amplifying circuit,

wherein the plurality of integrating capacitors are disposed on the second portion of the other surface of the printed circuit board.

2. The dosimetry device for charged particle radiation according to claim 1, wherein the second electrode substrate is constructed by a resin plate having a particle radiation transmitting characteristic equivalent to water.

3. The dosimetry device for charged particle radiation according to claim 1, wherein the second electrode substrate is constructed by a polyimide flexible substrate.

4. The dosimetry device for charged particle radiation according to claim 1, wherein a discharge switch is connected to the selector switch for discharging the integrating capacitors.

5. The dosimetry device for charged particle radiation according to claim 1, wherein the signal processing circuit has the first, second, and third selector switches, and each of the first and second selector switches switchably connects each corresponding one of the integrating capacitors to the third selector switch, and

the third selector switch switchably connects the outputs of the first and second selector switches to the amplifying circuit.

6. The dosimetry device for charged particle radiation according to claim 5, wherein discharge switches are connected to the output sides of the first and second selector switches for discharging the integrating capacitors.

7. The dosimetry device according to claim 1, wherein a number of integrating capacitors equals a number of first electrodes, and each integrating capacitor is connected to a corresponding one of the plurality of first electrodes.

8. A dosimetry device for charged particle radiation comprising:

a printed circuit board having one surface and other surface opposing to each other, the one surface including a central region, and the other surface including a first portion that overlaps the central region of the one surface and a second portion positioned out side of the first portion so as to not overlap the central region;

a plurality of first electrodes formed on the central region of the one surface of the printed circuit board;

a spacing frame disposed on the one surface of the printed circuit board to surround the central region of the one surface;

a second electrode substrate disposed on the spacing frame and having a second electrode opposing to each of the first electrodes through an ionized space; and

a signal processing circuit disposed on the other surface of the printed circuit board,

wherein the signal processing circuit includes a plurality of signal processing blocks each comprising;

a plurality of integrating ceramic capacitors resistant to charged particle radiation, coupled to the plurality of first electrodes, for integrating charge at each of the first electrodes;

at least one amplifying circuit; and

at least one selector switch that switchably connects each corresponding one of the integrating capacitors to the amplifying circuit,

wherein the plurality of integrating ceramic capacitors are disposed on the first portion of the other surface of the printed circuit board, the first portion is a back surface of the first electrodes.

9. A dosimetry device for charged particle radiation comprising:

a multi-layer printed circuit board having three or more wiring layers including at least first wiring layer, n-th wiring layer and a plurality of intermediate wiring layers between the first wiring layer and the n-th wiring layer opposing to one another, the multi-layer printed circuit board having one surface positioned on the first wiring layer and other surface positioned on the n-th wiring layer;

a plurality of first electrodes formed on the one surface on the first wiring layer;

a second electrode substrate having a second electrode opposing to each of the first electrodes through an ionized space; and

a signal processing circuit including a plurality of signal processing blocks,

wherein each of the signal processing blocks comprising;

a plurality of integrating capacitors, coupled to the correspondent electrodes of the plurality of first electrodes, for integrating charge at them;

at least one amplifying circuit disposed on the n-th wiring layer; and

at least one selector switch disposed on the n-th wiring layer that switchably connects each corresponding one of the integrating capacitors to the amplifying circuit,

wherein each of the plurality of signal processing blocks comprises a wiring combination for connecting the selector switch to corresponding one of integrating capacitors, and

wherein each wiring combination of the plurality of signal processing blocks is disposed on a different one of the intermediate wiring layers in the multi-layer printed circuit board.

10. The dosimetry device for charged particle radiation according to claim 9, wherein each of the wiring combinations connects each of the first electrodes in the corresponding group of first electrodes to the selector switch by through hole in the multi-layer printed circuit board.

11. The dosimetry device for charged particle radiation according to claim 10, wherein the multi-layer printed circuit board includes second wiring layer adjacent to the first wiring layer between the first wiring layer and the intermediate wiring layers, and a ground electrode pattern is formed on the second wiring layer.

12. The dosimetry device for charged particle radiation according to claim 11, wherein the multi-layer printed circuit board includes a plurality of additional wiring layers, each of the additional wiring layers is disposed between adjacent two of the intermediate wiring layers respectively, each of the additional wiring layers has a ground electrode pattern.

13. The dosimetry device for charged particle radiation according to claim 11, wherein the multi-layer printed circuit board includes a third wiring layer adjacent to the second wiring layer between the second wiring layer and the intermediate wiring layers,

a plurality of capacitor electrodes connected to the plurality of first electrodes are formed in the third wiring layer, and each of the capacitor electrodes forms the integrating capacitor.

14. The dosimetry device for charged particle radiation according to claim 9, wherein the second electrode substrate is constructed by a resin plate having a particle radiation transmitting characteristic equivalent to water.

15. The dosimetry device for charged particle radiation according to claim 9, wherein the second electrode substrate is constructed by a polyimide flexible substrate.

16. The dosimetry device for charged particle radiation according to claim 9, wherein a discharge switch is connected to the selector switch for discharging the integrating capacitors.

17. The dosimetry device for charged particle radiation according to claim 9, wherein the signal processing circuit has the first, second, and third selector switches, each of the first and second selector switches switchably connects each corresponding one of the integrating capacitors to the third selector switch, and

the third selector switch switchably connects the outputs of the first and second selector switches to the amplifying circuit.

18. The dosimetry device for charged particle radiation according to claim 17, wherein discharge switches are connected to the output sides of the first and second selector switches for discharging the integrating capacitors.

19. The dosimetry device for charged particle radiation according to claim 9,

wherein when assuming that a number of the plurality of the first electrodes is A and a number of the plurality of the signal processing blocks is B, the wiring combination of each of the signal processing blocks includes a number C=A/B of wirings for connecting the selector switch to a corresponding one of integrating capacitors.

20. A dosimetry device for charged particle radiation comprising:

a multi-layer printed circuit board having three or more wiring layers including at least a first wiring layer and an n-th wiring layer, which oppose one another, and a plurality of intermediate wiring layers between the first wiring layer and the n-th wiring layer, the multi-layer printed circuit board having one surface positioned on the first wiring layer and another surface positioned on the n-th wiring layer;

a number A of a plurality of first electrodes formed on the one surface positioned on the first wiring layer;

a second electrode opposing each of the first electrodes through an ionized space; and

a signal processing circuit disposed on the other surface positioned on the n-th wiring layer, the signal processing circuit including a plurality of amplifying circuits and a number B of a plurality of selector switches, each selector switch switchably connecting each of the first electrodes in a corresponding group that includes a number C=A/B of the first electrodes among the number A of plurality of first electrodes to the corresponding amplifying circuit,

wherein a number D of a plurality of wirings connecting the number A of the plurality of first electrodes to the number B of the plurality of selector switches are divided into a number E of a plurality of wiring combinations, and the number E of the plurality of wiring combinations are scattered on the plurality of intermediate wiring layers, and

wherein the number D is equal to the number C and the number E is equal to the number B.