JPH01284788A - Scintillation camera device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a scintillation camera device that statically or dynamically measures the status of radiopharmaceuticals administered to a subject. Regarding.

(Prior art) Conventionally, scintillation was developed as a device to statically or dynamically measure and analyze the distribution state of radiopharmaceuticals administered into the body. Recently, scintillation cameras have become mainstream due to their advantages such as: (1) being able to rapidly measure the state of R1 distribution.

FIG. 4(a) is an explanatory diagram showing the external appearance of a conventional scintillation camera device and the upright condition of the running wheels of the device, and FIG. 4(b) is a rotational condition of the scintillation detector and the end portion 4.
(C) is an explanatory view showing the positional relationship between the whole body bed and the end portion.

The scintillation camera device shown in Figures (a) to (C) is a scintillation detector (hereinafter simply referred to as a detector) that converts large gamma rays into scintillation light.
1, an arm 2 that rotatably supports the detector 1 in a vertical plane (in the direction of arrow C) and in a horizontal plane (in the direction of arrow C);
A detector support stand 3 that supports the arm 2 movably in the vertical direction (in the direction of the arrow), and an approximately r T that supports the detector support stand 3 in a movable manner (in the direction of the arrow B) on a stand movement rail 5. It has a configuration including a J-shaped base 4. In addition, 6 in the figure is a black and white monitor for monitoring the state of projection.

By the way, the scintillation camera device described above is called a stand type, and since it is necessary to stably support the detector 1 having a considerable number of limbs, each end of the approximately rTJ-shaped base 4 is provided with a stand type. Traveling wheels 7 to 9 are arranged.

Of these, the running wheels 7 and 8 are respectively arranged on both sides in the running direction B with the detector support stand 3 in between. , 1o are connected via a reduction gear (not shown) or the like. On the other hand, the running wheels 9 are rotatably mounted within the end portion 4a of the base 4 located below the detector 1.

This end portion 4a is designed so as not to become an obstacle when the detector 1 rotates in the direction of arrow C, as shown in FIG.
As shown in FIG. 3C, the height E from the floor needs to be set as low as possible so as not to contact the wheel support member 11a of the collimator exchange cart 11. Furthermore, the fourth
1' in Figure (b) shows the state of the detector 1 before rotation.

For the above reasons, the drive mechanism section, which conventionally consists of a drive source that requires a relatively large space and a mechanism section that transmits the driving force from this drive source to the traveling wheels, has been designed with the detector support stand 3. The clip was arranged near the running wheels 8 (7) so as to drive both or one of the running wheels 7 and 8 arranged on both sides of the running direction B of the clip.

On the other hand, when such a drive mechanism is not arranged inside the base 4, a chain, belt, etc. is stretched over the stand moving rail 5, and the sprockets 1-. The device was moved using gears, etc.

(Problem to be Solved by the Invention) However, as shown in FIG. 5(a), the detector 1 supported protruding from the side of the support member 3 has a mold temperature compared to other members. , the center of gravity 13 is biased toward the traveling wheels 9.

Therefore, since the traveling wheels 7 and 8 share the load between the two wheels, the load applied to each traveling wheel 7°8 is approximately less than half of the load applied to the traveling wheel 9 of the cart. Become. For this reason, it is not possible to obtain a sufficient frictional force between the running wheels 7.8 and the stand moving rail 5, and depending on the unevenness of the running surface on which this device is installed, the running wheels 7.8 may slip. There was a problem in that this caused the problem that positioning during traveling could not be performed accurately.

Such a tendency can be seen in the detector 1 as shown in FIG. 5(b).
This is particularly noticeable in a scintillation camera device in which two cameras are provided so that whole-body contrast can be performed simultaneously.

In the device equipped with two Zunawara detectors 1, the single core 12 is closer to the traveling wheel 9 side than in the device equipped with one detector shown in FIG. There is no hope of obtaining sufficient motion performance with the method of driving 8.

Figure 6(a) shows the loads 12, 13, and 14 applied to each traveling wheel 7°8.9 in the base 4 with arrows, and Figure 6(b) shows the actual measured values of loads 13, 14, and 12. This is an example. As is clear from FIG. 6(b), even in the case of one detector or two detectors, the value of the load 12 applied to the traveling wheel 9 is the same as that of the other traveling wheel 7.
It can be seen that this is larger than the load 13.14 applied to 8.

On the other hand, with the drive system using a chain, etc., there is no risk of slipping, but backlash occurs due to elongation of the chain, so positional accuracy cannot be expected, and the drive system becomes even larger. There is a drawback that it does.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a scintillation camera device that can always maintain stable running conditions and improve the accuracy of stopping positions.

[Structure of the Invention] (Means for Solving the Problems) The structure of the present invention for achieving the above object is such that, in the scintillation camera device described above, the middle running wheel disposed below the detector is rotatably driven. A drive+a structure is provided.

(Function) Next, the function of the present invention having the above configuration will be explained.

Since the relatively large load placed below the detector rotates the moving wheels, the driving force from the drive source is reliably transmitted in the running direction via the wheels. Therefore, a slip phenomenon does not occur, a stable running condition is always obtained, and the accuracy of the stopping position can be improved.

(Example) The present invention will be described below with reference to the drawings. The configuration of the scintillation camera device shown in this example is almost the same as the device described above, so components equivalent to those already explained will be given the same loads and their explanation will be omitted. We will focus on the main differences.

FIG. 1(a) is an external perspective view of a scintillation camera device as an embodiment.

The difference between the VC device shown in FIG. 4(a) and the device described in FIG. 4(a) is that two detectors 1 are provided;
The difference is in the configuration of the traveling wheels connected to the drive source and the drive mechanism.

In the end portion 4a' located below the detector 1.1 of the case 4 shown in FIG. A driving mechanism section is arranged, which is composed of a driving source and a mechanism section. Further, a hand switch 17 is attached to the upper end of the detector support stand via a hand switch support member 17b, and an operation button 17 of this hand switch 17 is attached.
The state of each part in the vicinity of the device can be set by the operation a.

Next, the details of the drive la groove portion are shown in FIG. 2(b).

FIG. 4B is an explanatory view of the mechanism showing an enlarged view of the internal structure of the end portion 4a'.

In the figure, the drive vJi structure 15 is a -
21, an input shaft 20b to which the rotational driving force of the rotating shaft 21a of the motor 21 is inputted via a bell]-22, and an output shaft 20a provided protruding perpendicularly to the input shaft 20b. The speed reducer 20 provided with this speed reducer 20
A small gear 19 fixed to an output shaft 20a of
and a large gear 18 attached to a rotating shaft 23.

The control device 24 shown in FIG.
5, an operator console 27 through which the operator inputs object information, setting status information of each part of the apparatus, etc., and a color monitor 26 through which the inputted information, pattern information, etc. are displayed.
have. Note that 28 in the figure is a whole-body bed on which the subject is placed.

Therefore, the traveling wheels 9 are appropriately rotated by a drive control signal 11 transmitted from the control device 24 via the drive mechanism section 15.

Incidentally, in accordance with FIG. 1(b), the drive mechanism section 15 is not limited to the illustrated embodiment, but may be a drive IlJM section having the configuration shown in FIGS. 3(a) to 3(c). Incidentally, 4a shown in FIG. 3(a) indicates the end portion of the case 4 described above, but 4a shown in FIG.

(C) is omitted for the sake of explanation.

First, the driving mechanism section 40 shown in FIG. 3(a) is
The driving wheel 9 disposed downstream of the detector 1.1 described above is directly attached to the rotating shaft 29a of the motor 29 as a drive source. When such a drive mechanism is used, it has the feature that it can be constructed in an extremely detailed manner.

Next, the drive mechanism section 41 shown in FIG.
1. A first gear 30 fixed to the rotating shaft 9a of the traveling wheel 9 arranged below, a second gear 31 that meshes with the first gear 30, and rotation of the second gear 31. It is equipped with a motor 33 as a drive source attached to a shaft 32. This configuration has the feature that the drive source can be installed apart from the traveling wheels.

The drive ti4M section 42 shown in FIG. 35 via a belt 38 and a motor 39 as a drive source. Incidentally, pulleys 37 and 36 are attached to the rotation of the motor @If (not shown) and one end of the worm, respectively, and the belt 38 is passed between these pulleys. When adopting such a configuration, in addition to the characteristics of the drive mechanism shown in FIG.
Suitable for use when

The functions and effects of the scintillation camera device configured as described above will be explained below.

When the A-pellator gives an instruction to start traveling by operating the A-pellator console 27 or the hand switch 17,
The separate drive mechanism 15 rotates the running wheels 9 in response to a drive control signal from the control device 24, and the present vehicle starts running.

By the way, as mentioned above, a larger load is applied to the traveling wheel 9 than to the other traveling wheels 7.8.

For example, in a scintillation camera device equipped with the two detectors, each of the normal running wheels 7 and 8 has approximately three
00 kg, and a load of approximately 700 kg (approximately 1 kg) is applied to the traveling wheels 9.

Here, if the coefficient of dynamic friction between the running wheels and the stand moving rail is 0.1, the drive when driving the running wheels 9, /J, is 70 kgf, which means that the running wheels 8 (7) as in the past The driving force when the drive is avoided is 30 kgf.

That is, when driving the traveling wheels 9 arranged below the detectors 1 and 1 as in this embodiment, a driving force approximately 2.3 times larger than the conventional driving force can be obtained. It turns out. Moreover, since the traveling wheels 9 close to the center of gravity are driven, the moment h generated around the center of gravity is
can be made smaller, and the device can be moved and stopped smoothly.

From the above, it is possible to prevent slippage between the stand moving rail and the traveling wheels, and to accurately position the vehicle during traveling. In general, since a compact drive mechanism as shown in FIGS. 1(b) and 3(a) to (C) is adopted, the movement of the end 4a of the case 4 from the floor surface is reduced. The height E can be set low. Therefore, when the detector 1 rotates in the direction of arrow C, it does not become an obstacle and does not come into contact with the wheel support member 11a of the collimator exchange cart 11. In addition, as mentioned above, as a result of obtaining a large driving force in this embodiment, it may be possible to use a small-output drive source as the driving source, and in this case, it is possible to further reduce size, reliability, and cost. is also possible.

It should be noted that the present invention is not limited to the embodiments shown or described above, and various modifications can be made within the scope of the invention.

In the above-described embodiment, one running wheel is arranged below the detector, but it may be composed of a plurality of running wheels in consideration of the driving force.

[Effects of the Invention] According to the present invention described in detail above, it is possible to provide a scintillation camera device that always obtains a stable running state and improves the accuracy of the stopping position.

[Brief explanation of the drawing]

FIG. 1(a) is an external perspective view of a scintillation camera as an embodiment of the present invention, and FIG. 1(b) is F in FIG. 1(a).
Fig. 2 is a perspective view of the overall structure of the scintillation camera device and its control device, and Fig. 3 (a> to (C) is a mechanism explanatory diagram for explaining the internal mechanism of the end portion shown in Fig. 3). FIG. 4(a) is an explanatory diagram showing another embodiment of the part, and FIG.
b) is an explanatory diagram showing the rotational state of the detector and the arrangement relationship with the end portion 4a; FIG. 5(C) is an explanatory diagram showing the arrangement relationship between the ball body bed and the end portion; b) is an explanatory diagram of the center of gravity position when one detector is provided and when two detectors are provided; FIG. 6(a) is an explanatory diagram without showing the cart attached to each traveling wheel; FIG. is an explanatory diagram showing specific values of the cylindrical shape in the case where one detector is provided and the case where two detectors are provided in the state shown in FIG.・・Supporting member,
7.8.9... Traveling wheels, 15.40, 41.42... Drive mechanism section. Figure 3 Figure 3 (C) Figure 5 (G) Figure 6

Claims (4)

[Claims] (1) A scintillation camera having running wheels arranged on both sides of a supporting member that projects laterally to support a scintillation detector, and running wheels arranged below the scintillation detector. 1. A scintillation camera device, characterized in that the device includes a drive mechanism for rotationally driving a running wheel disposed below the detector, and the supporting member is moved by the running wheel. (2) The scintillation camera device according to claim 1, wherein the drive mechanism section has a rotating shaft of a drive source directly attached to a traveling wheel that is supported and protrudes below the detector. (3) The drive mechanism section includes a first gear fixed to a rotating shaft of a traveling wheel that is supported so as to protrude below the detector, a second gear that meshes with the first gear, and a second gear that meshes with the first gear. 2. The scintillation camera device according to claim 1, further comprising a drive source attached to the rotating shaft of the second gear. (4) The drive mechanism unit includes a worm wheel fixed to a rotating shaft of a traveling wheel that is supported so as to protrude below the detector, and a drive source that rotates a worm that meshes with the worm wheel via a belt. The scintillation camera device according to claim 1, further comprising: a scintillation camera device.