TW201706007A - Detector for scanning ion beam measurement in radiotherapy capable of obtaining a highly precise space resolution, a highly precise space dosage and a highly precise scanning speed by the arrangement of first and second ion chambers and the allocation of first - Google Patents

Abstract

A detector for scanning ion beam measurement in radiotherapy is disclosed, including a first high voltage electrode, a first spacer, a double-sided segmented electrode, a second spacer and a second high voltage electrode. The first high voltage electrode comprises a first high voltage zone and the second high voltage electrode comprises a second high voltage zone. The double-sized segmented electrode comprises a first detection zone, a second detection zone, a first readout electrode disposed on the first detection zone, and a second readout electrode disposed on the second detection zone. The first spacer is utilized to surround the first high voltage and the first detection zone so as to form a first ion chamber. The second spacer is utilized to surround the second high voltage zone and the second detection zone so as to form a second ion chamber. With the arrangement of the first and second ion chambers and the allocation of the first and second readout electrodes configured in different directions, a highly precise space resolution, a highly precise space dosage and a highly precise scanning speed can be obtained.

Description

Detector for scanning ion beam measurement in radiation therapy

The invention relates to a detector, in particular to a detector for scanning ion beam measurement in radiation therapy.

Cancer is also known as a malignant tumor, which is an abnormal proliferation of cells, and the proliferating cells will invade other parts of the body. It has become one of the main causes of death in humans. The cancer can be surgically removed, chemotherapy, radiation therapy, immunotherapy, Single antibody treatment or other methods of treatment. Among them, radiation therapy is most often used as a direct or auxiliary treatment for cancer. It uses radiation to kill cancer cells, shrink tumors, and destroy the genetic material of cells by radiation. It can prevent cells from growing or dividing, thereby controlling cancer cells. Growing.

A conventional radiation therapy device, such as the "range shifter and particle beam therapy device" of the Republic of China Patent Publication No. I489974, the particle beam therapy device includes an accelerator for generating a particle beam, a plurality of treatment rooms, and a plurality of illumination devices. a plurality of range shifters disposed in the illumination devices, the particle beams being incident on the treatment chambers by the accelerators, the illumination devices being respectively disposed in the treatment rooms, and irradiating the particle beam with an illumination On a illuminating area of the object, the range shifter includes a penetrating plate and a holding portion for maintaining the penetrating plate. By adjusting the thickness of the penetrating plate, the particle beam can have different attenuation amounts. The energy of the particle beam can be adjusted.

Generally used in conjunction with a detector to confirm the parameters of the particle beam and the correct delivery of radiation dose. The traditional treatment is to use a large area of radiation, and then to create a specific shield according to the size of the tumor to limit the scope of the irradiation. Therefore, it is generally used for a specific position measurement for a two-dimensional detector or a small-sized detector (single channel). The ion treatment method of the invention uses a small-sized ion beam to scan the tumor position at a scanning speed of up to 20 m/sec, and the scanning speed can be controlled to control the dose. However, the conventional detectors cannot measure the scanning ion beam accurately because the spatial resolution is too large and the measurement speed is not fast enough. Therefore, how to improve the spatial resolution and measurement speed to accurately measure The parameters of the scanning ion beam and the radiation dose are an important issue.

The main object of the present invention is to solve the problem that the conventional detector cannot accurately measure the scanning ion beam because the spatial resolution is too large and the measurement speed is not fast enough.

In order to achieve the above object, the present invention provides a detector for scanning ion beam measurement in radiotherapy, comprising a first high voltage electrode, a second high voltage electrode, a first high voltage electrode and the second a double-sided segment electrode between the high voltage electrodes, a first spacer disposed between the first high voltage electrode and the double-sided segment electrode, and a second high voltage electrode and the double-sided segment electrode a second spacer, the first high voltage electrode includes a first high voltage region and a first region surrounding the first high voltage region, the second high voltage electrode includes a second high voltage region and a second high voltage region a second area of the area, the double-sided segment electrode includes a first detection area corresponding to the first high-voltage area, and a second detection area corresponding to the first detection area and corresponding to the second high-voltage area a second detection area, a third connection area surrounding the first detection area and the second detection area, a first readout electrode disposed in the first detection area, and a second detection a second readout electrode of the measurement zone, the first spacer comprising a first frame body connected to the first connection region and the third connection region, and a first ion chamber formed by the first frame body surrounding the first high voltage region and the first detection region, And the first readout electrode is received in the first ion chamber, the second spacer comprises a second frame body connected to the second joint region and the third joint region, and a second frame The second ion chamber is formed by the body surrounding the second high voltage region and the second detecting region, and the second readout electrode is received in the second ion chamber.

In summary, the present invention enhances the spatial resolution of the present invention by providing the first ion chamber and the second ion chamber in combination with the first readout electrode and the second readout electrode. The measurement speed of the present invention is improved, and therefore, highly accurate spatial resolution, spatial dose, and scanning speed can be obtained.

The detailed description and technical content of the present invention will now be described as follows:

Please refer to FIG. 1A, FIG. 1B and FIG. 2 for a schematic perspective view of a first embodiment of the present invention, and a cross-sectional structural view and a structural exploded view of 1B-1B of FIG. 1A. The invention relates to a detector for scanning particle beam measurement in radiotherapy, comprising a first high voltage electrode 10, a first spacer 40, a double-sided segment electrode 30, a second spacer 50 and a second high voltage electrode 20 including a first high voltage region 11 and a first junction region 12 surrounding the first high voltage region 11, the second high voltage electrode 20 including a second high voltage region 21 and a second junction region 22 surrounding the second high voltage region 21, the double-sided segment electrode 30 is disposed between the first high voltage electrode 10 and the second high voltage electrode 20, and includes a first high voltage region 11 Correspondingly disposed, a first detecting area 31, a second detecting area 32 disposed opposite to the first detecting area 31 and corresponding to the second high voltage area 21, and a surrounding the first detecting area 31 and the a third connection region 33 of the second detection region 32, a first readout electrode 34 disposed on the first detection region 31, and a second readout electrode 35 disposed on the second detection region 32. The first spacer 40 is disposed between the first high voltage electrode 10 and the double-sided segment electrode 30, and includes a connection a first frame body 41 connecting the region 12 and the third connection region 33, and a first ion chamber 42 formed by the first frame body 41 surrounding the first high voltage region 11 and the first detection region 31 The first readout electrode 34 is disposed in the first ion chamber 42. The second spacer 50 is disposed between the second high voltage electrode 20 and the double-sided segmented electrode 30, and includes a connection. a second frame body 51 of the second connection area 22 and the third connection area 33, and a second frame formed by the second frame body 51 surrounding the second high voltage area 21 and the second detection area 32. The ion chamber 52 is disposed, and the second readout electrode 35 is received in the second ion chamber 52.

Since the present invention has the first ion chamber 42 and the second ion chamber 52, it can be used to measure particle beams in both X and Y directions, and in the embodiment, the first readout electrode 34 includes a plurality of strips. The longitudinal electrode 341, the second readout electrode 35 includes a plurality of lateral electrodes 351, and the longitudinal electrodes 341 and the lateral electrodes 351 are each 127, and the spacing between them is 2 millimeters (mm), such a In the present invention, the spatial position resolution of less than 0.2 millimeters (mm) can be achieved by measuring the shape of the ion beam, and the position and trajectory of the particle beam can be accurately measured, and the measuring speed of the present invention can be greater than 10 kHz. It can accurately confirm the time variation of the particle beam parameters or the radiation dose, and improve the accuracy of the measurement.

In addition, the first spacer 40 further includes a first venting portion 43 disposed on the first frame body 41. The second spacer 50 also includes a second venting portion 53 disposed on the first frame body 41. The first gas permeable portion 43 communicates the first ion chamber 42 with the outside, and the second gas permeable portion 53 connects the second ion chamber 52 with the outside, so that external air can pass through the first gas permeable portion 43 The second gas permeable portion 53 enters the first ion chamber 42 and the second ion chamber 52. In this embodiment, the first spacer 40 and the second spacer 50 are each disposed symmetrically, but not limited thereto, and the first spacer 40 and the second spacer 50 are not limited thereto. The thickness is 3 mm (mm) and can be adjusted according to the needs of the user.

Furthermore, in order to make the first high voltage electrode 10, the first spacer 40, the double-sided segment electrode 30, the second spacer 50 and the second high voltage electrode 20 can be firmly joined, the first A first fixing member 60 is disposed on a side of the high-voltage electrode 10 away from the double-sided segment electrode 30, and a second fixing member 70 is disposed on a side of the second high-voltage electrode 20 away from the double-sided segment electrode 30. In this embodiment, the first fixing member 60 and the second fixing member 70 can be firmly engaged by using a locking manner, but not limited thereto.

The operation mode of the present invention is to apply a voltage difference between the double-sided segment electrode 30 and the first high voltage electrode 10 and the second high voltage electrode 20 to form an electric field, and the particle beam to be tested enters the first ion cavity. The chamber 42 (X direction) and the second ion chamber 52 (Y direction) ionize the gas in the first ion chamber 42 and the second ion chamber 52, and then through the action of the electric field The ions are collected on the first detection area 31 and the second detection area 32 of the double-sided segment electrode 30, and the first readout electrode 34 and the second readout electrode 35 are used to collect and collect The ions on the first detection area 31 and the second detection area 32 are subjected to subsequent analysis.

In summary, since two ion chambers are provided and the double-sided vertical and horizontal electrodes are provided, the spatial resolution of the present invention can be improved and the measurement speed of the present invention can be improved. Therefore, a highly accurate spatial resolution and space can be obtained. Dose and scanning speed.

Therefore, the present invention is highly progressive and conforms to the requirements of the invention patent application, and the application is made according to law, and the praying office grants the patent as soon as possible.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

10‧‧‧First high voltage electrode
11‧‧‧First High Pressure Zone
12‧‧‧ First access area
20‧‧‧second high voltage electrode
21‧‧‧Second high pressure zone
22‧‧‧second area
30‧‧‧Double-section electrode
31‧‧‧First detection area
32‧‧‧Second detection area
33‧‧‧ Third access area
34‧‧‧First readout electrode
341‧‧‧ longitudinal electrode
35‧‧‧Second readout electrode
351‧‧‧Transverse electrode
40‧‧‧First spacer
41‧‧‧First framework ontology
42‧‧‧First Ion Chamber
43‧‧‧First Ventilation Department
50‧‧‧Second spacer
51‧‧‧Second framework ontology
52‧‧‧Second ion chamber
53‧‧‧Second breathable part
60‧‧‧First fixture
70‧‧‧Second fixture

FIG. 1A is a schematic perspective view of a first embodiment of the present invention. Fig. 1B is a schematic cross-sectional view showing the structure of 1B-1B of Fig. 1A of the present invention. Fig. 2 is a schematic exploded view showing the structure of the first embodiment of the present invention.

10‧‧‧First high voltage electrode

11‧‧‧First High Pressure Zone

12‧‧‧ First access area

20‧‧‧second high voltage electrode

21‧‧‧Second high pressure zone

22‧‧‧second area

30‧‧‧Double-section electrode

31‧‧‧First detection area

33‧‧‧ Third access area

34‧‧‧First readout electrode

341‧‧‧ longitudinal electrode

35‧‧‧Second readout electrode

351‧‧‧Transverse electrode

40‧‧‧First spacer

41‧‧‧First framework ontology

43‧‧‧First Ventilation Department

50‧‧‧Second spacer

51‧‧‧Second framework ontology

53‧‧‧Second breathable part

60‧‧‧First fixture

70‧‧‧Second fixture

Claims (7)

A detector for scanning ion beam measurement in radiotherapy, comprising: a first high voltage electrode comprising a first high voltage region and a first junction region surrounding the first high voltage region; a second high voltage The electrode includes a second high voltage region and a second junction region surrounding the second high voltage region; a double-sided segment electrode disposed between the first high voltage electrode and the second high voltage electrode, including a first detection area corresponding to a high-voltage area, a second detection area disposed opposite to the first detection area and corresponding to the second high-voltage area, and a second detection area and the second a third connection area of the detection area, a first readout electrode disposed in the first detection area, and a second readout electrode disposed in the second detection area; a first high voltage electrode disposed on the first a first spacer between the double-sided segment electrodes includes a first frame body connected to the first connection region and the third connection region, and a first high-voltage region is surrounded by the first frame body, a first ion chamber formed by the first detection zone, and the first a readout electrode is disposed in the first ion chamber; and a second spacer disposed between the second high voltage electrode and the double-sided segment electrode includes a second connection region and the third a second frame body of the connection region, and a second ion chamber formed by the second frame body surrounding the second high voltage region and the second detection region, and the second readout electrode is accommodated in the second Diionic chamber. The detector for scanning particle beam measurement in radiotherapy according to claim 1, wherein the first spacer and the second spacer have a thickness of 3 mm. The detector for scanning particle beam measurement in radiotherapy according to claim 1, wherein the first readout electrode comprises a plurality of longitudinal electrodes, and the second readout electrode comprises a plurality of lateral electrodes . A detector for scanning particle beam measurement in radiotherapy according to claim 3, wherein the longitudinal electrodes are spaced apart from each other by 2 mm A detector for scanning particle beam measurement in radiotherapy according to claim 3, wherein the lateral electrodes are spaced apart from each other by 2 mm. The detector for scanning particle beam measurement in radiotherapy according to claim 1, wherein the first spacer further comprises a first gas permeable portion disposed on the first frame body, the first The second spacer further includes a second gas permeable portion disposed on the second frame body, and the first ion chamber and the second ion chamber communicate with the outside through the first gas permeable portion and the second gas permeable portion, respectively. The detector for scanning particle beam measurement in radiotherapy according to claim 1, further comprising a first fixing member and a second fixing member, wherein the first fixing member is disposed on the first A high voltage electrode is away from one side of the double-sided segment electrode, and the second fixing member is disposed on a side of the second high voltage electrode away from the double-sided segment electrode.