JP2007132723A - Radiation irradiation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation irradiation device capable of responding an erroneous operation by an operator related to blood bag or exposure dose setting. <P>SOLUTION: This radiation irradiation device comprises sensors 10 and 14 for detecting the thickness of the blood bag, and a sequencer 15 for controlling X-ray emission so that a predetermined dose of radiation is exposed to the blood bag, arranged on a tray 2 according to the detected thickness of the blood bag. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radiation irradiation apparatus that irradiates radiation containing X-rays or γ rays to a blood bag or the like that encloses blood for blood transfusion, and more particularly to a technique for correcting the radiation dose by the thickness of a blood bag.

A conventional two-way X-ray irradiation apparatus is described in Patent Document 1.
This X-ray irradiation apparatus includes a first X-ray tube apparatus, a sample surface arranged to face the X-ray tube apparatus, and a protective chamber for shielding X-rays in which these are incorporated. In the X-ray irradiation device, the second X-ray tube device is installed in the protective chamber facing the first X-ray tube device with the sample dish in the middle, and the cathode and anode of the second X-ray tube device are Conventionally without rotating the sample pan by irradiating X-rays from both sides of the sample by both X-ray tube devices by making them arranged opposite to each other in one X-ray tube device Compared to the above-mentioned equipment, it is possible to achieve uniform irradiation in a short time, and even when a large dose is required, a small X-ray tube that can be easily obtained can provide the required irradiation dose. It was made to be able to do it.
No. 7-43679

  In the conventional two-way X-ray irradiation apparatus, the operator performs measurement of the thickness of the blood flow bag in the dedicated tray and selection of the dose switch corresponding to the thickness. Since there is no function on the device side to check whether the thickness of the blood bag mounted in the device is appropriate or not, no consideration has been given to handling an operator's erroneous operation.

  Accordingly, an object of the present invention is to provide a radiation irradiation apparatus that can cope with an erroneous operation by an operator related to setting of a blood bag and an irradiation dose.

  The above object is provided in a radiation irradiation apparatus comprising a radiation irradiation unit that irradiates an irradiation object with radiation, and a tray unit that is disposed in a radiation irradiation direction of the irradiation irradiation unit and places the irradiation object. Detecting means for detecting the thickness of the object, and the radiation irradiating unit so that a predetermined amount of radiation is irradiated to the irradiated object arranged on the tray unit in accordance with the detected thickness of the irradiated object. This is achieved by providing irradiation control means for controlling.

  ADVANTAGE OF THE INVENTION According to this invention, it can respond to the misoperation by the operator who concerns on the setting of the irradiation amount of a blood bag.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment of the invention, and the repetitive description thereof is omitted.

  The structure of a dedicated tray (hereinafter referred to as a thickness detection function tray) used in the blood irradiation apparatus with a blood bag thickness detection function will be described with reference to FIG. Two types of thickness detection function trays are prepared: a thickness detection function tray 1 having a thickness of 160 mm or less and a thickness detection function tray 2 having a thickness of 30 mm or less. The difference between these two types of thickness detection function trays is only the thickness as shown in FIG.

Hereinafter, the structure and material of the thickness detection tray will be described.
The thickness detection function tray is divided into an upper lid part 4 and a tray part 7. As shown in the AA cross-sectional view, the upper lid portion 4 includes an outer frame 4a, a lid 4b, and an outer frame 4c. The lid 4b is sandwiched between upper and lower outer frames and screwed.
On the other hand, the tray portion 7 is composed of a cylindrical portion 7a, a bottom plate 7b, and an outer frame 7c. Like the upper cover 4, the tray portion 7 is sandwiched between the cylindrical portion 7a and the bottom frame 7c and screwed. If both have sufficient strength, they may be bonded instead of screwed. The material of the outer frame 4a, the outer frame 4c, the cylindrical portion 7a, and the bottom frame 7c is preferably a lightweight material that can sufficiently withstand radiation. For example, aluminum or polyimide resin excellent in radiation resistance is preferable. Acrylic materials are also good. The lid 4b and the bottom plate 7b are preferably made of a material having little X-ray absorption and strength.

  In this embodiment, a carbon plate is used. Since the conventional dedicated tray has no upper cover, the tubes 3a of the blood bag 3 often protrude outside the dedicated tray. Since there is a possibility that the outside of the dedicated tray may be outside the irradiation field, the thickness detection function tray is provided with a lid so that the tubes are steadily accommodated in the tray. In addition, when several blood bags 3 are mounted in piles, if the total thickness of the stacked blood bags is slightly thicker than the thickness of the tray 7, the thickest part of the blood bag is not irradiated with the set dose. there is a possibility. For this reason, the lock mechanism 5 is provided on the upper lid 4 so that the total thickness of the blood bag is within the thickness of the tray, so that the blood bag can be pressed down.

  In the present embodiment, a commercially available snap lock is provided. The cylindrical portion 7 is provided with a positioning pin 6 so that it can be easily locked, and the upper lid portion 4 has a hole corresponding to the pin. By combining these, the position of the hook 5a of the lock mechanism 5 and the position of the lock portion (not shown) can be easily aligned.

  Next, the blood bag thickness detection function will be described with reference to FIG. Since the present invention mainly has a blood bag thickness detection function, the structure, configuration, function, and operation of the conventional two-way X-ray irradiation apparatus are already well known and will not be described in detail.

  First, the difference from the prior art will be described with reference to FIG. In the schematic plan view of the irradiation chamber, a thickness detection tray 2 having a thickness of 30 mm or less is disposed in the X-ray irradiation field 25. As with the prior art, a filter drive unit 12 is added on the right side, and the probe 11 and the sensor 10 (light receiving side) for detecting a tray with a thickness of 30 mm or less and a 60 mm thickness are detected on the filter drive base plate 12a during the preparation operation. A sensor 11 (light receiving side) for detecting the following tray 1 is added. On the side facing the sensors 101 and 11, a light-projecting sensor is disposed. Here, a sensor that outputs an ON signal when the light on the light projecting side is blocked is used on the light receiving side. You may employ | adopt the sensor of the system which serves as light and light reception, and detects the change of the light quantity of reflected light. An input module 16 for receiving sensor signals is added to the sequencer unit 14.

  A program for determining the bag thickness is added to the CPU module 15. The operation of the program is briefly described below. If both sensor 10 and sensor 11 or only sensor 11 is turned ON during the preparatory operation, the preparatory operation does not start. If the sensor 10 is turned on at the time of irradiation, it is determined that a blood bag is mounted on the tray 2 having a thickness of 30 mm. If both the sensors 10 and 11 are turned on, it is determined that a blood bag is mounted on the tray 1 having a thickness of 60 mm. Further, an output module 17 for outputting an operation signal to the filter driving unit 12 based on the determination result of the CPU module 15 is added. A touch panel 30 for displaying operations and various states is added and controlled by the CPU module 15.

  An operation example of the present invention will be described with reference to FIG. The thickness detection tray 2 is mounted on the table 20, and the thickness detection tray 2 is carried into the irradiation chamber 18 using the operation panel 30 or a table switch foot switch or hand switch. The hatched portion in the figure indicates a shielding material. In this embodiment, lead or the like is used as a shielding material. When the loading is completed, the output signals of the sensors 10 and 11 are input to the input module 16.

  In this example, the operation when a tray 1 having a thickness of 30 mm or less is mounted is mainly described. When the irradiation device is in the X-ray tube preparation operation mode when the carry-in is completed, the light from the projector of the sensor 10a is shielded, so that the sensor 10 is turned on and the ON signal is input to the input module 16 of the sequencer unit 15. And the information is transmitted to the CPU module 15. As with the prior art, if an ON signal is output from both the sensor 10 or sensor 14 during the preparatory operation, the touch panel from the CPU module 15 prevents the blood bag from being accidentally irradiated with X-rays during the preparatory operation of the X-ray tube. An error is displayed at 30, and a message is displayed to the operator to take out the thickness detection tray 2. If the preparation operation has already been completed, the thickness detection tray 2 blocks the light from the projector of the sensor 15 and the sensor 10 is turned on, and the ON signal is input to the input module 16 of the sequencer unit 15. Then, information is transmitted to the CPU module 15. Since there is nothing that shields the sensor 14, the ON signal is not output. The CPU module 15 recognizes that the thickness detection tray mounted based on this information is 30 mm thick, and operates the filter driving unit 12 by the output module 17 to cover the probe 11 with a filter corresponding to the thickness.

  On the other hand, when a tray having a thickness of 60 mm or less is detected, both sensors are turned ON, an ON signal is input to the input module 16 of the sequencer unit 15, and information is transmitted to the CPU module 15. Based on this information, the CPU module 15a causes the output module 17 to operate the filter driving unit 12, and covers the probe 11 with a filter corresponding to the thickness. Accordingly, by performing thickness detection and thickness correction on the apparatus side without depending on the operator, blood with insufficient X-ray dosage can be irradiated more safely without being administered to the patient.

The external appearance structural view of the thickness detection function tray. The thickness detection functional block diagram.

Explanation of symbols

  1 60mm thickness tray, 2 30mm thickness tray, 3 blood bag, 3a tubes, 4 upper lid, 4a outer frame 1, 4b lid, 4c outer frame 2, 5 lock mechanism, 5a hanging bracket, 6 positioning pin, 7 Tray part, 7a cylindrical part, 7b bottom plate, 7c bottom frame, 10 sensor 1 light receiving side, 10a sensor 1 light emitting side, 11 dosimeter probe, 12 filter driving part, 12a filter, 12b filter mechanism base, 14 sensor 2 light receiving side , 14a Sensor 2 floodlight side, 15 Sequencer section, 15a CPU module, 16 input module, 17 output module, 18 irradiation room, 20 table, 25 irradiation field, 30 touch panel (operation panel)

Claims (1)

A radiation irradiation unit for irradiating the irradiated object with radiation;
A tray unit arranged in the radiation irradiation direction of the radiation irradiation unit to place the irradiated object; and
In the radiation irradiated object device comprising:
Detecting means for detecting the thickness of the irradiated object;
Irradiation control means for controlling the radiation irradiation unit so that a predetermined amount of radiation is irradiated to the irradiation object arranged on the tray unit according to the detected thickness of the irradiation object;
A radiation irradiation apparatus comprising:

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