JP3516407B2 - Data transmission apparatus and X-ray CT apparatus using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device for transmitting data between a rotating part and a fixed part in a frame of an X-ray CT apparatus, for example.

[0002]

2. Description of the Related Art In recent years, X-ray CT apparatuses have been widely used as medical diagnostic apparatuses have been developed. The X-ray CT apparatus includes an X-ray tube and an X-ray tube which are arranged to face each other with a subject interposed therebetween.
The line detector is rotated (the X-ray detector may be fixed in some cases), the detection data for each projection is reconstructed, and a desired cross-sectional image is captured. X like this
In the X-ray CT apparatus, electrical connection is required between the rotating unit to which the X-ray tube is attached and the fixed unit to which the image processing system is arranged.

The electrical connection usually includes a power system for supplying power to the X-ray source, an instrumentation system for transmitting data from a detector and the like, and a control system for transmitting control data such as rotational movement. Of these, a slip ring is used to connect the power system. The instrumentation system and the control system were also connected by slip rings before, but in recent years, data transmission using light is performed as disclosed in, for example, Japanese Patent Application No. 4-208856. ing.

FIG. 7 shows such a Japanese Patent Application No. 4-20885.
It is explanatory drawing which shows the data transmission apparatus disclosed by No. 6 typically. Reference numeral 1 shown in the figure is a rotating portion, and 2 is a fixed portion, which are arranged to face each other. The rotating portion 1 has 12 circular arc-shaped substrates 5 continuously arranged to form an annular shape, and an LED as a light emitting element is provided on the inner peripheral side of each substrate 5.
5 are provided for each 4. In addition, 2 of each substrate 5
Two PDs (photodiodes) 3 as light receiving elements are arranged on the outer peripheral side of each substrate.

On the other hand, the fixed portion 2 also has an annular ring divided into 12 substrates 5 like the rotating portion 1, and has LEDs 7, P.
D6 is arranged at a position opposite to the rotating unit 1. That is, five LEDs 7 are mounted on the outer peripheral side of each substrate 5, and two PDs 6 are mounted on the inner peripheral side of the two substrates.

Therefore, if an optical signal is transmitted from each of the LEDs 4 and 7 and is received by the PDs 6 and 3 that face it, the rotating unit 1
The bidirectional data transmission from the fixed unit 2 to the fixed unit 2 is possible.

[0007]

By the way, in such a data transmission apparatus, data is affected by electric noise generated from a peripheral unit such as an X-ray generator or an electric (electronic) device placed in the periphery. May lead to transmission errors. Further, on the contrary, there is a drawback that noise generated from the data transmission device affects peripheral units and electric (electronic) devices placed in the periphery to cause malfunction.

The present invention has been made to solve such a conventional problem, and an object thereof is to provide a data transmission device capable of preventing the influence of noise and an X-ray CT using the same. To provide a device.

[0009]

[Means for Solving the Problems] To achieve the above object
The invention according to claim 1 is a rotating part and a fixed part of an X-ray CT apparatus.
Substrate having light emitting means for transmitting data between
And the position changes relative to the first substrate,
Second group having light receiving means for receiving an optical signal from the means
Data that includes a plate and that transmits data via optical signals
In the transmission device, the first substrate and the second substrate are covered.
I installed a shield member to shield electrical noise.
It is characterized by

The invention according to claim 2 is the X-ray CT apparatus.
Equipped with a light emitting means for transmitting data between the rotating part and the fixed part of
And the position of the first substrate is changed relative to the first substrate.
The light receiving means for receiving the optical signal from the light emitting means.
And a second member having the same, and transmits data via an optical signal.
In the data transmission device for transmitting, the first substrate,
At least one of the two substrates is divided and covered to provide electrical noise.
It is characterized by the provision of a shield member that shields
It

Further , the invention according to claim 3 includes a plurality of substrates.
At least 1 on each substrate
A rotating part provided with one light emitting means or light receiving means, and a plurality of rotating parts.
The substrates are arranged in a non-continuous manner so as to face the rotating part.
And the light emitting means and the light receiving means of the rotating part are provided on each substrate.
At least one light receiving means or light emitting hand for performing optical transmission between
Data of an X-ray CT apparatus having a fixed part in which steps are arranged
In the transfer device, cover each of the boards to prevent electrical noise.
A shield member for shielding is provided.

Further, the invention according to claim 4 is at least X.
A rotating part equipped with a wire tube and a data processing system were installed.
It consists of a fixed part and the rotating part discontinuously connects multiple substrates.
At least one light emitting element on each substrate
Means or a light-receiving means is provided in the rotary transmitter / receiver,
The fixing unit disposes a plurality of substrates in a non-continuous manner and transfers the number of times.
Rotation transmission / reception is performed on each substrate by forming an annular shape facing the receiving unit.
At least the optical transmission between the light emitting means and the light receiving means
Fixed transmission / reception with one light receiving means or one light emitting means
Part, and transfer data between the rotating part and the fixed part via light.
In an X-ray CT apparatus for sending, each substrate is covered and
The provision of a shield member that shields atmospheric noise
Characterize.

[0013]

In the data transmission apparatus of the first invention of the present application constructed as described above, the first member and the second member are shielded, so that noise that enters the data transmission apparatus and radiation from the data transmission apparatus. Noise can be prevented, and transmission errors and malfunctions of other devices can be prevented. Further, in the data transmission device of the second invention, since the first member and the second member are divided and shielded, the shield becomes easy. Further, in the data transmission device of the third aspect of the invention, since a plurality of non-continuous substrates are arranged side by side to form an annular rotating part and a fixed part, a gap is formed between adjacent substrates, and this gap is used. It is possible to shield each board.

Further, in the X-ray CT apparatus of the fourth invention of the present application, the data transmission apparatus of the second invention is provided between the rotating section on which the X-ray tube is mounted and the fixed section on which the data processing system is mounted. Since it is used, easy shielding is possible.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a first embodiment of a data transmission device according to the present invention. As shown in the figure, in this data transmission device, a disk-shaped rotary plate 21 and a disk-shaped fixed plate 22 are arranged to face each other, and the rotary plate 21 and the fixed plate 22 are shown in FIG. As shown, twelve substrates are continuously arranged to form an annular shape (in FIG. 1, the shield plate 2
Not visible because of 3a and 23b). Then, each substrate is covered with annular shield plates 23a and 23b,
Only parts 3, 6 and LEDs 4, 7 are exposed.

Therefore, according to such a configuration, it is possible to prevent noise that intrudes from the outside and noise that is emitted to the outside, and it is possible to prevent a data transmission error and a malfunction of a device existing outside.

FIG. 2 is a block diagram showing a second embodiment of the data transmission device according to the present invention. As shown in the figure, in this data transmission device, a disk-shaped rotating plate 11 and a disk-shaped fixed plate 12 are arranged to face each other. The rotary plate 11 is provided with a plurality of substrates, each of which has an annular shape with a part cut out and to which the LEDs 14 as light emitting means are attached, and each substrate is covered with a shield plate 13a.

Further, the fixing plate 12 has an annular shape with a part cut away, and a plurality of substrates to which PDs (photodiodes) 15 as light receiving means for receiving the optical signals output from the LEDs 14 are attached are arranged. Each substrate is also covered with the shield plate 13b.

FIG. 3 shows a substrate 16 provided on the rotating plate 11.
It is explanatory drawing which shows the attachment position of a. As shown,
The substrate 16a has a size obtained by dividing an annular plate into 12 equal parts, and four parts are removed at equal intervals. That is, the substrate 16a
Is eight. Five LEDs 14 are attached to each board 16a so that an optical signal can be output. Each of the two substrates is shielded by the shield plate 13a.

FIG. 4 shows a substrate 16 provided on the fixed plate 12.
It is explanatory drawing which shows the attachment position of b. This board 16b
Similarly to the above-described substrate 16a on the rotating plate 11 side, the ring-shaped plate has a size divided into 12 equal parts, and four parts are removed at equal intervals. Two PDs 15 are attached to each substrate 16b so that the optical signals output from the LEDs 14 can be received. Each of the two substrates is shielded by the shield plate 13a.

FIG. 5 is a sectional view showing a first example of a mounting state of the substrate 16 (16a, 16b) and the shield plate 13 (13a, 13b). As shown in FIG.
The periphery of 6 is covered with the shield plate 13, and the LED 1
4 Only the mounting portion and the mounting portion of the wiring 17 for connecting to the outside are opened. Then, the surrounding metal portion of the LED 14 and the shield plate 13 are connected by, for example, solder or the like, as indicated by reference numeral 14a. The ground wire 17a of the wiring 17 is also connected to the shield plate 13 in the same manner.
According to this structure, the entire substrate 16 is the shield plate 1.
Since it is covered with 3, the noise received by the substrate 16 and the noise emitted from the substrate 16 can be prevented. Further, since the shield plate 16 has a shape obtained by dividing an annular shape, it is easy to create and does not require a sophisticated sheet metal technique.

FIG. 6 is a sectional view showing a second example of the mounting state of the substrate 16 and the shield plate 13. As shown in the figure, in this example, the entire back surface 16c of the substrate 16 is used as a ground plane (so-called solid ground), and the shield plate 13 and this ground plane 16c are connected by soldering or the like. Even in such a configuration, the substrate 16 can be shielded, and
The shield plate 13 can be omitted because the back surface 16c of the substrate 16 is used as a ground surface.

Further, according to the present invention, the substrate 1 on the rotating plate 11 side is
6a is formed in a discontinuous annular shape, but this does not interrupt the data transmission. That is, the substrate 1
Since each of 6a and 16b has three spaces and one is omitted, at least four substrates 16 are provided.
The a and the substrate 16b face each other. Therefore, data transmission is always performed, and in this case, 4-channel data transmission is possible.

In this embodiment, the ring-shaped substrate is divided into 12 equal parts, but the present invention is not limited to this.
Other division numbers may be used.

Further, such a data transmission device is particularly suitable for use in an X-ray CT device. The X-ray CT apparatus includes a rotating unit in which an X-ray tube and an X-ray detector are arranged to face each other (the X-ray detector may not rotate) and a fixed unit in which a data processing system is arranged. It is necessary to transmit detection data and the like. Therefore, the data transmission apparatus of the present embodiment is used for X-ray CT.
If it is adopted in the device, it becomes possible to easily shield the device, and it is possible to prevent a malfunction of the device and a noise component generated in the reconstructed image.

[0026]

As described above, in the data transmission device of the first invention of the present application, since the first member and the second member are shielded, noise that enters the data transmission device and radiation from the data transmission device. The generated noise can be prevented, and transmission errors and malfunctions of other devices can be prevented. Further, in the data transmission device of the second invention of the present application, the first member and the second member are divided and shielded, so that the shield becomes easy. Further, in the data transmission device of the third invention of the present application, since a plurality of non-continuous substrates are arranged side by side to form an annular rotating portion and a fixed portion, a gap is formed between adjacent substrates, and this gap is used. It is possible to shield each board. Further, in the X-ray CT apparatus of the fourth invention of the present application, the data transmission apparatus of the second invention is used between the rotating portion on which the X-ray tube is mounted and the fixed portion on which the data processing system is mounted. Therefore, easy shielding is possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a data transmission device according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the data transmission device according to the present invention.

FIG. 3 is an explanatory diagram showing an arrangement of substrates attached to a rotary plate.

FIG. 4 is an explanatory view showing an arrangement of substrates attached to a fixed plate.

FIG. 5 is an explanatory diagram showing a first example of the configuration of a shield plate.

FIG. 6 is an explanatory diagram showing a second example of the configuration of the shield plate.

FIG. 7 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

1 rotating part 2 Fixed part 3,6,15 PD (photo diode) 4,7,14 LED 5, 16 (16a, 16b) substrate 11,21 Rotating plate 12,22 Fixed plate 13 (13a, 13b) Shield plate 17 wiring 23a, 23b Shield plate

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Claims (6)

(57) [Claims] 1. A device between a rotating part and a fixed part of an X-ray CT apparatus.
A first substrate having a light emitting means for transmitting data, and the first substrate
A second substrate having a light receiving means for receiving an optical signal from the light emitting means, the position of which is relatively changed with respect to the substrate, and a data transmission device for performing data transmission via an optical signal, Covers the first and second boards to prevent electrical noise.
Data transmission apparatus characterized in that a Rudo shielding member. 2. A device between a rotating part and a fixed part of an X-ray CT apparatus.
A first substrate having a light emitting means for performing over data transmission, the first
Relatively position is changed to the substrate, and a second member having a light receiving means for receiving a light signal from said light emitting means, in the data transmission device for transmitting data over an optical signal, the A data transmission device, characterized in that at least one of the first substrate and the second substrate is divided and covered to provide a shield member for shielding electrical noise . 3. A rotating part in which a plurality of substrates are discontinuously arranged to form an annular shape, and at least one light emitting means or light receiving means is provided on each substrate, and a plurality of substrates are discontinuously arranged to form a ring. X having a ring shape facing the rotating part, and each substrate having a light emitting means of the rotating part, at least one light receiving means for transmitting light to and from the light receiving means, or a fixed part provided with the light emitting means. A data transfer device for a line CT device , comprising: a shield member that covers each of the substrates and shields electrical noise . 4. A rotary unit having at least an X-ray tube mounted thereon and a fixed unit having a data processing system mounted thereon, wherein the rotary unit has a plurality of substrates arranged discontinuously to form an annular shape. The substrate has a rotation transmitting / receiving unit in which at least one light emitting unit or light receiving unit is arranged, and the fixing unit forms a ring shape facing the rotation transmitting / receiving unit by disposing a plurality of substrates in a non-continuous manner. Has a fixed transmission / reception unit in which at least one light reception unit or light emission unit for transmitting light between the light emission unit and the light reception unit of the rotary transmission / reception unit is disposed, and the rotation unit and the fixed unit are connected via light. An X-ray CT apparatus for performing data transfer between the X-ray CT apparatus, comprising: a shield member that covers each of the substrates and shields electrical noise . 5. The shield member is a solid surface provided on one surface of each substrate for shielding electrical noise.
4. The data transfer device according to claim 1, wherein the data transfer device is electrically connected to the base surface. 6. The shield member is provided on one surface of each substrate and is a solid surface for shielding electrical noise.
X-ray CT apparatus according to claim 4, characterized in that is electrically connected to the over scan plane.