CN203870259U

CN203870259U - Whole-body electron beam irradiation dose measuring die

Info

Publication number: CN203870259U
Application number: CN201420254302.7U
Authority: CN
Inventors: 杨波
Original assignee: Wuxi No 4 Peoples Hospital
Current assignee: Wuxi No 4 Peoples Hospital
Priority date: 2014-05-16
Filing date: 2014-05-16
Publication date: 2014-10-08
Anticipated expiration: 2024-05-16

Abstract

The utility model relates to a whole-body electron beam irradiation dose measuring die comprising a die body, which is provided with an ionization chamber matching hole. The die body comprises a front surface, a rear surface, a left side surface, a right side surface, an upper surface, and a lower surface. The left side surface and the right side surface are arc-shaped surfaces. The ionization chamber matching hole is disposed in the middle part of the front surface, and the opening is disposed in the upper surface. The ionization chamber matching hole comprises a first cylindrical hole and a second cylindrical hole, and the distance between the axes of the ionization chamber matching hole and the front surface is in a range from 5.0 to 5.5mm. The hole-body electron beam irradiation dose measuring die is advantageous in that the structure is simple, the production costs are low, and the use and the operation are convenient; the accurate data capable of satisfying the clinical requirements can be acquired only by one-time irradiation, the dose conversion and the overlap factor measurement are not required, and the dose accuracy during the radiotherapy can be improved.

Description

Whole body electron beam irradiation dosage measurement die body

Technical field

The utility model relates to a kind of tumour radiotherapy die body dosage measurement device, relates in particular to a kind of radiation dose measurement die body, belongs to technical field of medical instruments.

Background technology

CTCL claims again skin mycosis fungoides, on the basis of standardization chemotherapy, carrying out whole body electron beam irradiation is effective treatment means, range of exposures comprises the skin that whole body is all, in the face of large range of exposures like this, normal structure under skin is avoided again unnecessary irradiation simultaneously, therefore select electron beam irradiation to be advisable, but linear accelerator only has 40cm * 40cm at the wild area of maximum illumination of 100cm distance, must extend irradiation distance to 300cm～400cm during radiation therapy delivery for this reason, for increasing scattering, lowering energy need use the organic glass that 1cm is thick to shield as diffuser screen, patient stands in the 10cm place below of diffuser screen, simultaneously for preventing the eclipsing effects of irradiation field, irradiation field is divided into the just front wild of upper body and the lower part of the body by human body, left front open country, right front open country, left back open country, right back open country and just rear open country be totally 12 irradiation fields, on need seamless connection between marching off into political wilderness, and irradiate need interval between adjacent fields the next day, within 2 days, complete the full-body exposure of 1 time, in the face of so complicated illuminate condition, the absorbed dose of organizing that how to guarantee the subcutaneous 5mm of patient place is that 30Gy is the key that guarantees curative effect, and current only dose data is the degree of depth number percent of each irradiation field size of the 100cm under respective electronic heat input, in fact the distance under this illuminate condition has become, energy quantitative change, scattering has become, launched field is overlapping, for guaranteeing the accurate of clinical practice data, must carry out on-the-spot actual measurement and corresponding dosage conversion.

At present, while carrying out field measurement according to this illuminate condition,

(1) the measurement die body such as original water tank, solid water can not meet field condition, only uses to wear 5mm balance cap FC65 ionization chamber and measure, and has ignored the dosage scattering in whole die body.

(2) measurement of overlap factor is only done corresponding correction according to the variation of irradiating number of times, and human body overlapping when reality is irradiated be different.

(3) only measure the reference point dosage at fixed range place, and the irradiation distance of human body ray when rotary irradiation is because changing appears in the profile of human body.

Summary of the invention

The purpose of this utility model is not enough in order to overcome in prior art, provides a kind of simple in structure, without the whole body electron beam irradiation dosage measurement die body of repeatedly measuring and dosage converts.

The utility model adopts following technical scheme: a kind of whole body electron beam irradiation dosage measurement die body, comprise die body body, on described die body body, be provided with ionization chamber mating hole, described die body body includes front surface, rear surface, left surface, right flank, six faces of upper surface and lower surface, described left surface and right flank are arcwall face, described ionization chamber mating hole is arranged at the positive middle part of front surface, described ionization chamber mating hole comprises the first cylindrical hole and the second cylindrical hole, the axle center of described ionization chamber mating hole and the distance of front surface are 5.0-5.5mm, and basic parallel with front surface.

Further, six of described die body body faces adopt poly (methyl methacrylate) plate to be bonded.

The utlity model has simple in structure, cost of manufacture is low, use simple operation, only needs once irradiating can obtain precise information, without carrying out dosage conversion and overlap factor, measures again, and can improve the accuracy of dose in Patients During Radiotherapy.

Accompanying drawing explanation

Fig. 1 is vertical view of the present utility model.

Fig. 2 is front view of the present utility model.

Reference numeral: die body body 1, ionization chamber mating hole 2, the first cylindrical hole 2-1, the second cylindrical hole 2-2.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail.

As Figure 1-Figure 2, a kind of whole body electron beam irradiation dosage measurement die body, comprise die body body 1, on die body body 1, be provided with ionization chamber mating hole 2, die body body 1 includes front surface, rear surface, left surface, right flank, six faces of upper surface and lower surface, front surface is the plane of a long 10cm, rear surface is that a length is the plane of 30cm, left surface and right flank are arcwall face, the height of die body body 1 is 20cm, thickness is 15cm, described ionization chamber mating hole 2 is arranged at the top at the positive middle part of front surface, the axle center of ionization chamber mating hole 2 and the distance of front surface are 5mm, ionization chamber mating hole 2 comprises the first cylindrical hole 2-1 and the second cylindrical hole 2-2, described the first cylindrical hole 2-1 diameter is 0.8cm, the degree of depth is 0.57cm, described the second cylindrical hole 2-2 diameter is 0.7cm, the degree of depth is 0.25cm.Six faces of die body body adopt poly (methyl methacrylate) plate to be bonded.

Conventional measurement ionization chamber is FC65 ionization chamber clinically, what whole body electron beam irradiation needed is the absorbed dose of organizing of the subcutaneous 5mm of patient place reference point, simultaneously clinically conventional subcutaneous 5mm place reference point dosage of usining human body navel place as prescribed dose, therefore shape of the present utility model is copied to human abdomen's configuration design, the arc design of left surface and right flank can reduce the inaccurate error producing of the measurement data causing because of plane reflection, be arranged so that ionization chamber and the die body body placed of the first cylindrical hole and the second cylindrical hole fit like a glove, guarantee the accurate of dosage transmission and measured data.

Using method: according to the illuminate condition of whole body electric wire, adjust irradiation distance, place diffuser screen, die body is placed on revolvable disk, FC65 is measured to ionization chamber and vertically insert in die body ionization chamber mating hole 2, ionization chamber probe is combined closely with die body 1, connect electrometer, select accelerator electric wire energy, by a clockwise or counterclockwise direction, 60 ° of every rotation die bodys, give 100MU, irradiate after 1 week, actual measurement data is reference point and organizes absorbed dose ratio.

Claims

1. a whole body electron beam irradiation dosage measurement die body, comprise die body body (1), on described die body body (1), be provided with ionization chamber mating hole (2), described die body body (1) includes front surface, rear surface, left surface, right flank, six faces of upper surface and lower surface, described left surface and right flank are arcwall face, described ionization chamber mating hole (2) is arranged at the positive middle part of front surface, described ionization chamber mating hole (2) comprises the first cylindrical hole (2-1) and the second cylindrical hole (2-2), the axle center of described ionization chamber mating hole (2) and the distance of front surface are 5.0-5.5mm, and basic parallel with front surface.

2. whole body electron beam irradiation dosage measurement die body as claimed in claim 1, is characterized in that: six faces of described die body body (1) adopt poly (methyl methacrylate) plate to be bonded.