DE8429531U1 - Computed tomograph - Google Patents

Description

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Siemens Aktiengesellschaft Our symbol Berlin and Munich VPA WP 3 4 2 O DE

Computed tomograph

The invention relates to a computer tomograph with a stationary device part in which a turntable is rotatable is mounted, the on both sides of an opening receiving the patient an X-ray tracer jnd one Radiation detector ^ rises.

() In a computer tomograph of this type, the heat loss must the X-ray tube and possibly also the radiation detector and / or the measuring electronics. For this purpose, an oil circuit can be provided in which the cooling oil between the component to be cooled and a circulated by a fan cooled oil cooler. The oil cooler must be placed on the turntable, which causes a strong warming of the interior of the computer tomograph. In addition, there can be hot spots form. This has a strong negative influence on the sensitive measuring electronics.

s 25 The invention is based on the object of a computed tomograph of the type mentioned so that a targeted dissipation of the heat loss from the turntable to the outside.

According to the invention, this object is achieved in that the stationary device part has a U-shaped annular channel has at least one inflow and one outflow opening for a cooling medium, arranged in the dieh rim Cooling fins protrude. In the case of the computer tomograph according to the invention can on the slewing ring along a circle Köhlrip-

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pen are provided in the fixed ring channel! protrude and are cooled there by cooling air. This results in a targeted dissipation of the heat from the components the turntable to the outside without the interior of the device being excessively heated.

An expedient constructive solution results if j the cooling fins are arranged on the outside of a chamber in the turntable j wreath, which is supported by a coolant, e.g. B.]

is flowed through by cooling oil, which flows through the housing of the | X-rays and / or through a cooling chamber for the Radiation detector and / or the measuring electronics flows. In the ring channel can be used to contact signal transmission a rotating signal transmitter is arranged by the beam detector be formed by opposing high-frequency antennas on the turntable and in the ring channel | is. j

The invention is explained in more detail below with reference to the drawing.

Fig. 1 shows a computer toinograph according to the invention, and

FIG. 2 shows a section along the line H-II in FIG. 1.

FIG. 1 shows a computer tomograph 1, which has a stationary device part 2 and, on a turntable 3, an X-ray scanner 4 and a radiation detector with measuring electronics 5. In order to scan an examination object lying in an opening 6 , the turntable 3 with the X-ray tracer 4 and the radiation detector 5 is rotated around the object so that it is irradiated from a multitude of directions. A

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Calculator calculated from the radiation received in each case * intensities the attenuation values of predetermined points in a slice of the examination subject j as Cornpu- ^ Tertomogram can be reproduced graphically. on A voltage supply 7 and additional electronics 8 are also arranged on the turntable.

To cool the components on the turntable 3, in particular the X-ray emitter 4, oil is pumped through the housing 9 of the X-ray emitter 4, which enters through an inlet line 10 and exits through an outlet line 11 Line lying around the outside of the turntable 3 from the oil outlet line 11 to the oil inlet line 10.

For this purpose, a circulating pump is arranged on the turntable 3.

The cooling oil is cooled by cooling air, which enters through an air inlet nozzle 12 and exits through an air outlet nozzle 13. The cooling is based the figure 2 explained in more detail.

From Figure 2 it can be seen that the fixed device part 2 has a U-shaped annular channel 14 through which the cooling air is conveyed by a fan from the air inlet connection 3 2 to the air outlet connection 13. In the annular channel 14 protrudes cooling fins 15, which are arranged on the turntable 3, specifically in the area of the oil line 16. When the turntable 3 rotates, the cooling fins 15 move in the annular channel 14 and the cooling air flows over them, whereby the heat from the cooling oil is dissipated in a targeted manner. A thermal insulation 17 ensures that the The heat of the cooling oil is essentially only applied to the cooling fins 15, but not to the other parts of the slewing ring 3 breeds. Furthermore, between the fixed

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Upcoming part 2 and the turntable 3, a seal 18 is provided, which allows the cooling air to flow out of the channel IA prevented.

In a similar way to the X-ray tracer 4, the radiation detector and / or the measuring electronics 5 can also pass through Kühlöl can be cooled.

A rotating transformer is arranged in the ring channel 14 and is formed by opposing high-frequency antennas 19 on the turntable 3 and 20 on the stationary part 2. The high-frequency antennas 19, 20 are insulated from the components 2, 3 by insulating pieces 21, 22.
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4 claims
2 figures

Claims (4)

Π β re t> rs r 4 · ι ι η ··· μ ι ι - 5 - VPA 84Ρ 3 42 0 DE claims 1. Computed tomograph with a fixed part of the device (2), in which a turntable (3) is rotatably mounted on both sides of an opening receiving the patient (6) carries an X-ray tracer (4) and a radiation detector (5), characterized in that that the stationary device part (2) has a U-shaped annular channel (14) with at least one inlet flow opening (12) and an outflow opening (13) for a cooling medium, in the arranged on the turntable The cooling fins (15) protrude. 2. Computed tomograph according to claim 1, characterized in that the cooling fins (15) are arranged on the outside of a chamber (16) in the slewing ring (3) through which a coolant flows, through the housing (9) of the X-ray (4) and / or the radiation detector and / or the measuring electronics (5) flows. 3. Computed tomograph according to claim 1 or 2, characterized in that im Ring channel (14) a rotating signal transmitter (19, 20) is arranged. 4. Computed tomograph according to claim 3, characterized in that the signal transmitter formed by opposing high-frequency antennas (19, 20) on the turntable (3) and in the ring channel (14) is.