JPH0619450B2 - Scintillation camera device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a scintillation camera device for statically or dynamically measuring the distribution state of a radiopharmaceutical administered to a subject.

(Prior Art) Conventionally, a scintillation scanner has been developed as a device for statically or dynamically measuring and analyzing the distribution state of a radiopharmaceutical administered to the body. However, a rapid RI that has high sensitivity and simultaneously detects the measurement visual field range. Recently, scintillation cameras have become the main focus because of the advantage of being able to measure the distribution state of.

FIG. 4 (a) is an explanatory view showing an external appearance of a conventional scintillation camera device and an arrangement state of traveling wheels of the device, and FIG. 4 (b) is a rotation state of a scintillation detector and an end portion 4.
FIG. 3C is an explanatory diagram of the arrangement relationship with a, and FIG. 7C is an explanatory diagram showing the arrangement relationship of the whole body bed and the end portion.

The scintillation camera device shown in FIGS. 1A to 1C is a scintillation detector that converts incident gamma rays into scintillation light (hereinafter simply referred to as a detector).
1 and an arm 2 that rotatably supports the detector 1 in a vertical plane (direction of arrow C) and in a horizontal plane (direction of arrow D).
A detector support stand 3 that movably supports the arm 2 in the vertical direction (direction of arrow A), and an approximate "T" that supports the detector support stand 3 movably on the stand moving rail 5 (direction of arrow B). The base 4 is shaped like a letter. Incidentally, reference numeral 6 in the drawing is a black and white monitor for monitoring the photographing state.

By the way, the above-mentioned scintillation camera device is called a stand type, and it is necessary to stably support the detector 1 having a considerable weight. Wheels 7 to 9 for traveling are respectively arranged.

Of these, the traveling wheels 7 and 8 are arranged on both sides in the traveling direction B with the detector support stand 3 interposed therebetween, and the traveling wheel 8 includes a drive source 10 for rotationally driving the traveling wheel 8. Are connected via a speed reducer (not shown). On the other hand, the traveling wheel 9 is rotatably mounted in the end 4 a of the base 4 located below the detector 1.

This end portion 4a does not obstruct the rotation of the detector 1 in the arrow C direction as shown in FIG.
As shown in FIG. 6C, the height E from the floor surface needs to be set as low as possible so as not to come into contact with the support member 11a of the wheel of the collimator exchange carriage 11. The fourth
1'in the figure (b) shows the state before rotation of the detector 1.

From the above, the drive mechanism unit including the drive source, which conventionally requires a relatively large space, and the mechanism unit that transmits the drive force from the drive source to the traveling wheels, sandwiches the detector support stand 3. In order to drive both or one of the traveling wheels 7 and 8 arranged on both sides in the traveling direction B, the traveling wheels 7 and 8 are arranged in the vicinity of the traveling wheels 8 (7).

On the other hand, when such a drive mechanism is not arranged in the base 4, a chain, a belt or the like is stretched over the stand moving rail 5, and the device is moved on the stand moving rail 5 via a sprocket, a gear or the like. Was there.

(Problems to be Solved by the Invention) However, as shown in FIG. 5 (a), the detector 1 which is projected and supported laterally of the support member 3 is heavier than other members, The center of gravity 13 is biased toward the traveling wheel 9 side.

Therefore, since the traveling wheels 7 and 8 share the load between the two wheels, the load applied to each of the traveling wheels 7 and 8 is about half or less than the load applied to the traveling wheel 9. . Therefore, the frictional force between the traveling wheels 7 and 8 and the stand moving rail 5 cannot be sufficiently obtained, and the traveling wheels 7 and 8 may slip depending on the unevenness of the traveling surface on which this device is installed. There is a problem in that a phenomenon occurs and positioning cannot be performed accurately during traveling.

Such a tendency is caused by the detector 1 as shown in FIG.
This is remarkable in the scintillation camera device in which two whole body photography is performed at the same time.

That is, in the device provided with two detectors 1, the center of gravity 12 is closer to the traveling wheel 9 side than in the device provided with one detector shown in FIG. It is not desirable to obtain sufficient exercise performance with this method.

6 (a) shows the loads 12, 13, 14 applied to the traveling wheels 7, 8, 9 in the base 4 by arrows, and FIG. 6 (b) shows the measured values of the loads 13, 14, 12, respectively. FIG. As is clear from FIG. 6B, the value of the load 12 applied to the traveling wheel 9 is different from that of the other traveling wheels 7 even in the case of one detector or two detectors.
It can be seen that the loads applied to 8 are larger than the loads 13 and 14.

On the other hand, in the method of driving via the chain or the like, there is no fear of causing a slip phenomenon, but since backlash occurs due to elongation of the chain or the like, positional accuracy cannot be desired, and the drive system is further increased in size. There is a drawback that

Therefore, it is an object of the present invention to provide a scintillation camera device that always obtains a stable traveling state and aims at a factory with a stop position accuracy.

[Structure of the Invention] (Means for Solving the Problems) The structure of the present invention for achieving the above-mentioned object is a drive mechanism for rotationally driving a traveling wheel arranged below the detector in the scintillation camera device described above. Parts are provided.

(Operation) Next, the operation of the present invention having the above configuration will be described.

Since the traveling wheels, which are disposed below the detector and under a relatively large load, are rotationally driven, the driving force from the drive source is reliably transmitted to the traveling surface via the traveling wheels. Therefore, the slip phenomenon does not occur, a stable traveling state is always obtained, and the stop position accuracy can be improved.

(Example) Hereinafter, the present invention will be described with reference to the drawings. Since the configuration of the scintillation camera device according to the present embodiment is almost the same as that of the device described above, the same components as those already described are designated by the same reference numerals, and the description thereof will be omitted. A description will be given focusing on the different points.

FIG. 1A is an external perspective view of a scintillation camera device as one embodiment.

The difference between the device shown in FIG. 4A and the device described in FIG. 4A is that two detectors 1 are provided, a traveling wheel to which a drive source is connected, and the drive mechanism. The difference is in the structure of the section.

In the end 4a ′ located below the detectors 1 and 1 of the case 4 shown in FIG. 4A, the traveling wheel 9 (not shown) and the traveling wheel 9 are driven to rotate. A drive mechanism unit including a drive source and a mechanism unit is disposed. A hand switch 17 is attached to the upper end of the detector support stand via a hand switch support member 17b. By operating the operation button 17a of the hand switch 17, it is possible to set the state of each part in the vicinity of the device. I have to.

Next, the details of the drive mechanism section are shown in FIG.

FIG. 2B is a mechanism explanatory view showing an enlarged internal structure of the end 4a '.

In the figure, the drive mechanism unit 15 projects a motor 21 as a drive source, an input shaft 20b to which the rotational driving force of a rotary shaft 21a of the motor 21 is input via a belt 22 and a direction perpendicular to the input shaft 20b. A reduction gear 20 having an output shaft 20a provided therein, a small gear 19 fixed to the output shaft 20a of the reduction gear 20, and a small gear 19 arranged so as to always mesh with the small gear 19. And a large gear 18 attached to the rotary shaft 23 of the.

The control device 24 shown in FIG.
It has a computer cabinet 25 containing a PU and the like, an operator console 27 for an operator to input subject information, setting state information of each part of the apparatus, etc., and a color monitor 26 for displaying the input information, imaging information, etc. There is. Reference numeral 28 in the figure denotes a whole body bed on which the subject is placed.

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

By the way, the drive mechanism section 15 shown in FIG. 1 (b) is not limited to the illustrated embodiment, but may be a drive mechanism section having a configuration shown in FIGS. 3 (a) to 3 (c).
It should be noted that 4a shown in FIG. 4A shows an end portion of the case 4 described above, but it is omitted in FIGS. 4B and 4C for the sake of explanation.

First, the drive mechanism section 40 shown in FIG. 3 (a) has a configuration in which the traveling wheel 9 arranged below the detectors 1 and 1 is directly attached to the rotary shaft 29a of the motor 29 as a drive source. There is. When using such a drive mechanism unit,
It has a feature that it can be configured extremely simply.

Next, the drive mechanism section 41 shown in FIG.
1 a first gear wheel 30 fixed to a rotation shaft 9a of a traveling wheel 9 disposed below, a second gear wheel 31 meshing with the first gear wheel 30, and a rotation of the second gear wheel 31. A motor 33 as a drive source attached to the shaft 32 is provided. With such a configuration, the drive source can be installed separately from the traveling wheels.

The drive mechanism section 42 shown in FIG. 3C includes a worm wheel 34 fixed to the rotating shaft 9 a of the traveling wheel 9 arranged below the detectors 1, 1 and a worm wheel meshing with the worm wheel 34. And a motor 39 as a drive source for rotating 35 via a belt 38. It should be noted that pulleys 37 and 36 are attached to one end of the rotary shaft (not shown) of the motor and the worm, and the belt 38 is stretched between these pulleys. Such a configuration is suitable for obtaining a relatively large reduction gear ratio together with the features of the drive mechanism portion shown in FIG.

The operation and effect of the scintillation camera device configured as described above will be described below.

When the operator gives a travel start instruction by operating the operator console 27 or the hand switch 17, the drive mechanism section 15 rotationally drives the travel wheels 9 by a drive control signal from the control device 24, and the present device starts travel.

By the way, as described above, a larger load is applied to the traveling wheels 9 than the other traveling wheels 7 and 8.

For example, in the scintillation camera device having the two detectors, the normal traveling wheels 7 and 8 each have about 3
A load of about 00 kg and about 700 kg is applied to the traveling wheels 9.

Here, assuming that the dynamic friction coefficient between the traveling wheels and the stand moving rail is 0.1, the driving force for driving the traveling wheels 9 is 70 kgf, which is the same as the conventional traveling wheels 8.
The driving force when driving (7) is 30 kgf.

That is, when the traveling wheels 9 arranged below the detectors 1, 1 are driven as in the present embodiment, a driving force as large as about 2.3 times as large as the conventional driving force can be obtained. It will be. Moreover, since the traveling wheels 9 near the center of gravity are driven, the moment force generated around the center of gravity can be reduced, and the device can be smoothly moved and stopped.

From the above, it is possible to prevent the slip phenomenon between the stand moving rail and the traveling wheels, and to accurately perform positioning during traveling. Further, since the compact drive mechanism portion as shown in FIG. 1 (b) and FIGS. 3 (a) to (c) is adopted, the height E of the end portion 4a of the case 4 from the floor surface can be reduced. Can be set low. Therefore, there is no obstacle when the detector 1 rotates in the direction of arrow C,
It does not come into contact with the support member 11a of the wheel of the collimator exchange cart 11. Further, as described above, in this embodiment, as a result that a large driving force can be obtained, a driving source with a small output may be used, and in this case, further reduction in size, weight and cost can be achieved. Is also possible.

The present invention is not limited to the embodiments shown or described above, but various modifications can be made within the scope of the gist thereof.

In the above-mentioned embodiment, one traveling wheel is arranged below the detector, but it may be composed of a plurality of traveling 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 traveling state and improves the stop position accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is an external perspective view of a scintillation camera as one embodiment of the present invention, and FIG. 1 (b) is F in FIG. 1 (a).
2 is a mechanism explanatory view for explaining the internal mechanism of the end portion shown in FIG. 2, FIG. 2 is an external perspective view showing the entire configuration of the scintillation camera device and its control device, and FIGS. FIG. 4 (a) is an explanatory view showing an external appearance of a conventional scintillation camera device and an arrangement state of traveling wheels of the device, and FIG. 4 (b) is a detector of the detector. An explanatory view of the positional relationship between the rotating state and the end 4a, an explanatory view showing the positional relationship between the whole body bed and the end, and FIG. 5 (a) and FIG. 5 (b) showing a detector. 1
6A and 6B are explanatory views of the center of gravity position in the case where one wheel is provided and the case where two are provided, FIG. 6A is an explanatory view showing a load applied to each traveling wheel, and FIG. 6B is shown in FIG. It is explanatory drawing which shows the concrete value of the load in the case where one detector is provided and the case where two detectors are provided in a state. 1 ... Scintillation detector, 3 ... Support member, 7, 8, 9 ... Running wheels, 15, 40, 41, 42 ... Drive mechanism section.

Claims (4)

[Claims] 1. A scintillation camera device having traveling wheels arranged on both sides of a support member for sandwiching and supporting a scintillation detector in a lateral direction, and traveling wheels arranged below the scintillation detector. The scintillation camera device according to claim 1, further comprising: a drive mechanism section that rotationally drives the traveling wheels disposed below the detector, and the supporting member is moved by the traveling wheels. 2. The scintillation camera device according to claim 1, wherein the drive mechanism is a drive wheel having a rotating shaft directly attached to a traveling wheel that is supported so as to project downward from the detector. 3. The drive mechanism portion includes a first gear fixed to a rotating shaft of a traveling wheel that is supported so as to project downward from the detector, and a second gear that meshes with the first gear. This second
The scintillation camera device according to claim 1, further comprising: a drive source attached to a rotating shaft of the gear. 4. A drive source for rotating a worm wheel fixed to a rotating shaft of a traveling wheel, which is projected and supported below a detector, and a worm, which meshes with the worm wheel, via a belt. The scintillation camera device according to claim 1, further comprising: