JP2012124099A5 - Radiation generator and radiation imaging system - Google Patents

Description

The present invention relates to a radiation generator applicable to non-destructive X-ray imaging and the like in the fields of medical equipment and industrial equipment, and a radiation imaging system including the radiation generator.

Accordingly, the present invention provides a radiation generator capable of shielding unnecessary radiation and cooling a target with a simple structure, enabling a reduction in size and weight, and a higher reliability, and a radiation imaging system including the radiation generator. The purpose is to provide.

In order to solve the above problems, the present invention includes a storage container,
A transmission radiation tube disposed inside the storage container;
A radiation generator comprising a cooling medium disposed in an extra space inside the storage container,
The transmission radiation tube is
An envelope having an opening;
An electron emission source disposed inside the envelope and facing the opening;
A transmissive substrate that transmits radiation;
A target installed on the surface of the transmission substrate on the electron emission source side, which generates radiation by irradiation of electrons emitted from the electron emission source;
A shield that blocks a portion of the radiation emitted from the target;
A heat insulating member installed between the transmission substrate and the cooling medium;
With
The shield has a passageway that communicates with the opening of the envelope, it said transmission substrate is provided in said passage,
The cooling medium is in contact with at least a part of the shield.
The present invention also provides a radiation generator according to the present invention,
A radiation detector that detects radiation emitted from the radiation generator and transmitted through the subject;
A radiation imaging system comprising: the radiation generating device and a control device that controls the radiation detecting device.

It is a schematic diagram of the radiation generator of 1st Embodiment and a target peripheral part. It is a schematic diagram of the target periphery part of 2nd Embodiment. It is a schematic diagram of the target periphery part of 3rd Embodiment. It is a schematic diagram of the target periphery part of 4th Embodiment. It is a block diagram of the radiography system using the radiation generator of this invention.

[Fifth Embodiment]
Next, a radiation imaging system using the radiation generator of the present invention will be described with reference to FIG. FIG. 5 is a configuration diagram of the radiation imaging system of the present embodiment. The radiation imaging system according to the present embodiment includes a radiation generation device 30, a radiation detection device 31, a signal processing unit 32, a control device 33, and a display unit 34. As the radiation generator 30, for example, the radiation generators of the first to fourth embodiments are preferably used. The radiation detector 31 is connected to the controller 33 via the signal processing unit 32, the control unit 33 is connected to a display unit 34 and the voltage control unit 3.

The processing in the radiation generator 30 is comprehensively controlled by the control device 33. For example, the control device 33 controls radiation imaging by the radiation generation device 30 and the radiation detection device 31. The radiation emitted from the radiation generation device 30 is detected by the radiation detection device 31 through the subject 35 and a radiation transmission image of the subject 35 is taken. The captured radiation transmission image is displayed on the display unit 34. Further, for example, the control device 33 controls driving of the radiation generating device 30 and controls a voltage signal applied to the transmission radiation tube 10 via the voltage control unit 3.

Claims (12)

A storage container;
A transmission radiation tube disposed inside the storage container;
A radiation generator comprising a cooling medium disposed in an extra space inside the storage container,
The transmission radiation tube is
An envelope having an opening;
An electron emission source disposed inside the envelope and facing the opening;
A transmissive substrate that transmits radiation;
A target installed on the surface of the transmission substrate on the electron emission source side, which generates radiation by irradiation of electrons emitted from the electron emission source;
A shield that blocks a portion of the radiation emitted from the target;
A heat insulating member installed between the transmission substrate and the cooling medium;
With
The shield has a passageway that communicates with the opening of the envelope, it said transmission substrate is provided in said passage,
The radiation generating apparatus according to claim 1, wherein the cooling medium is in contact with at least a part of the shield. The shield includes a first shield disposed on the electron emission source side with respect to the target, and a second shield disposed on a side facing the first shield with respect to the target. Consists of
The first shield has a first passage formed by the first shield inside the envelope;
The second shield has a second passage formed by the second shield outside the envelope;
Electrons emitted from the electron emission source are irradiated to the target through the first passage,
The radiation generating apparatus according to claim 1, wherein the radiation emitted from the target is radiated to the outside of the envelope through the second passage. The radiation generating apparatus according to claim 2, wherein an opening diameter of the second passage gradually increases toward the outside. The first shielding body and the second shielding body are arranged so that the center of the opening of the first passage and the center of the opening of the second passage are arranged on the same straight line. The radiation generator according to claim 2 or 3, wherein The heat insulating member, a radiation generating apparatus according to claim 1 or 2, characterized in that it comprises a low pressure space than atmospheric pressure therein. The heat insulating member, a radiation generating apparatus according to claim 1 or 2, characterized in that the interior is configured with a gas. The inside of the heat insulating member communicates with the inside of the envelope through a hole,
The radiation generating apparatus according to claim 5 , wherein the hole is provided in the shield. The heat insulating member, a radiation generating apparatus according to claim 1 or 2, characterized in that than the material constituting the shield is a solid composed of low thermal conductivity material. The heat insulating member, a radiation generating apparatus according to claim 1 or 2, characterized in that also provided between the inner wall and the cooling medium of the passageway. The cooling medium is a radiation generating apparatus according to any one of claims 1 to 9, characterized in that an electrical insulating oil. It further comprises voltage control means for setting the target voltage to + (Va−α) [V], the electron emission source voltage to −α [V] (where Va>α> 0), respectively. radiation generating apparatus according to any one of claims 1 to 10, wherein. The radiation generator according to any one of claims 1 to 11 ,
Emitted from the radiation generating device, and a radiation detector for detecting radiation transmitted through the subject,
Radiation imaging system, characterized in that it comprises a control device for controlling said radiation detector and the radiation generating device.