JPH11290305A - X-ray photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling performance of an X-ray tube and to improve the through-put of an X-ray photographing device by providing a duct part provided with a one end opening in the case body part of the X-ray tube so as to permit a blow to pass and a cooling part arranged in the other end opening so as to blow cool air to a duct. SOLUTION: A system is constituted of an X-ray tube device 1, a cooler unit 2 for discharging cool air, the duct part 3 for passing cool air and the photographing device 5. The device 1 is the one for generating an X-ray and most of inputted electric energy generates heat. The unit 2 is provided with a duct connecting part to be connected to the part 3. Cool air 4 blown from the unit 2 passes through the duct 3 and is blown to a radiator arranged in the case body part (Haube-case) of the device 1. Then, the release of heat in the case is urged and the temp. of insulating oil filed inside the case can also be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an X-ray imaging apparatus having an X-ray tube, wherein the X-ray tube has improved cooling characteristics.
The present invention relates to a technique for shortening the time of interruption of imaging of an X-ray imaging apparatus.

[0002]

2. Description of the Related Art In a conventional X-ray imaging apparatus, an X-ray tube housing (Haube case) is urged to dissipate heat by using a material having good thermal conductivity, or is forcedly cooled by an electric fan to produce an X-ray.
The tube was being cooled. The reason for this is that downsizing of the X-ray imaging apparatus is required by users, and this downsizing limits the space for mounting the X-ray tube, and makes it impossible to mount a cooler such as a heat exchanger on the X-ray tube. is there. Therefore, if the use of the X-ray tube continues, a so-called overheating state occurs due to heat storage or the like, and X-ray imaging has to be interrupted until the overheating is eliminated. The reason why the X-ray imaging is interrupted is to prevent an electric leakage accident from the X-ray tube to which a high voltage is applied due to the deterioration of the insulation property of the Howbe case due to overheating.

[0003] Further, interruption of X-ray imaging due to overheating is caused by interventional radiology, which requires continuous medical examinations and medical examinations in which the subject is photographed one after another.
This hinders the continuous operation (throughput). In recent X-ray tubes, a large capacity anode is required for high output.

[0004]

However, if the cooling performance of the X-ray tube apparatus is not improved with the increase in the capacity of the anode, it is necessary to interrupt the imaging for a longer time due to overheating, and the X-ray imaging is required. There is a problem that the throughput of the apparatus may be further hindered. The present invention has been made to solve the above problems, and an object of the present invention is to provide an X-ray imaging apparatus capable of improving the cooling performance of an X-ray tube and improving the throughput of the X-ray imaging apparatus. .

[0005]

An object of the present invention is to provide a method for measuring a subject
In an X-ray tube for irradiating X-rays and an X-ray imaging apparatus for detecting transmitted X-rays of the subject and creating an X-ray transmission image of the subject, an opening at one end is provided in a housing portion of the X-ray tube. The present invention is achieved by an X-ray imaging apparatus including a duct unit having a wind and a cooling unit provided at an opening at the other end of the duct unit to blow cooling air to the duct.

The X-ray tube is provided with a duct having an opening at one end in a housing portion thereof and through which cooling air flows, and a cooling portion provided at the opening at the other end of the duct to blow cooling air into the duct. Accordingly, the heat release of the Howe case is promoted, and the temperature of the insulating oil filled in the Howe case can be reduced, so that the time until the overheating is reached can be made longer than in the conventional case.

Further, even if overheating occurs, the X-ray tube can be cooled quickly by the cooling air, so that the interruption time of the imaging can be shortened as compared with the conventional case. Therefore, the throughput of the X-ray imaging apparatus can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an X-ray imaging apparatus according to the present invention will be described with reference to the drawings. FIG. 1 shows the X of the present invention.
FIG. 2 is a perspective view showing an embodiment of the radiographic apparatus, FIG. 2 is a sectional view of the X-ray tube apparatus of FIG. 1, and FIG. 3 is a view showing an example of the cooler unit of FIG. In FIG. 1, 1 is an X-ray tube device, 2
Is a cooler unit for discharging cooling air, 3 is a duct for passing cooling air 4, and 5 is a photographing device.

The X-ray tube apparatus 1 generates X-rays, but most of the input electric energy generates heat.
As shown in FIG. 2, the generated heat includes a heat generated from the anode target 8 and a heat accumulated in the insulating oil 9. In order to cool these heats at the same time, cool air may be applied to the Howe case 10.

The cooler unit 2 is a commercially available cool air generator, and has a duct connecting portion 2a which can be connected to the duct portion 3 as shown in FIG. The cooling air 4 blown out from the cooler unit 2 is connected via a duct connecting part 2 a, passes through the duct part 3 laid from the cooler unit 2 to the X-ray tube device 1, and has a casing part of the X-ray tube device 1. By spraying the radiator 6 provided in the (Haube case 10), the heat release of the Haube case is promoted, and the temperature of the insulating oil filled in the Haube case 10 can be lowered.

Here, since the cooling capacity increases as the difference (ΔT) between the temperature of the insulating oil and the temperature of the air blown to the radiator increases, the heat transfer coefficient from the conventional X-ray tube apparatus by natural cooling is generally lower. Typically, the heat transfer coefficient is about 1 to 20 W / m2 ° C.
250 W / m2 ° C. In the case of natural cooling, when the room temperature is 20 ° C. and the Haubé case is 80 ° C., the heat transfer coefficient is 8
0 to 1600 W / m2 ° C.

In this example, when the temperature of the cooling air is 10 ° C., ΔT increases by 10 ° C., ie, 700 to 17500
W / m2 ° C, which is about 10 times the amount of heat transfer, so that the temperature of the Howe case and the temperature of the insulating oil can be further reduced.

As described above, the radiator 6 of the X-ray tube device 1 has an opening at one end and the duct 3 through which cooling air flows, and the duct 3 provided at the opening at the other end of the duct 3 cools the duct 3. By providing the cooler unit 2 for blowing air, the heat release of the Haube case 10 is promoted, and the temperature of the insulating oil 9 filled in the Haube case 10 can be reduced. Can be long.

Further, even if overheating occurs, the X-ray tube apparatus 1 can be cooled quickly by the cooling air 4, so that the interruption time of the imaging can be shortened as compared with the conventional case.

[0015]

The present invention improves the cooling performance of an X-ray tube,
There is an effect of providing an X-ray imaging apparatus capable of improving the throughput of the X-ray imaging apparatus.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an X-ray imaging apparatus according to the present invention.

FIG. 2 is a cross-sectional view of the X-ray tube device of FIG.

FIG. 3 is a view showing an example of the cooler unit of FIG. 1;

[Explanation of symbols]

 2 Cooler unit 3 Duct 6 Radiator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiji Koyanagi 1-1-1 Uchikanda, Chiyoda-ku, Tokyo Inside Hitachi Medical Corporation

Claims (1)

[Claims] An X-ray tube for irradiating an object with X-rays and an X-ray imaging apparatus for detecting transmitted X-rays of the object and creating an X-ray transmission image of the object are provided. An X-ray radiographing system comprising: a duct portion having an opening at one end in a casing portion thereof and through which air can pass, and a cooling portion provided at an opening at the other end of the duct portion and blowing out cooling air to the duct. apparatus.