JPS626541Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a bilateral collimator used in a scintillation camera.
This is an attempt to make it easier, including the direction.

Bilateral collimators are generally used when performing synchronous multiplex imaging of parts of the human body, such as organs, using a stationary radiation detection camera such as an Unger scintillation camera. In other words, bilateral collimators can use the various scintillation cameras that are currently in use, and can take images from the same two directions, making more effective use of the field of view of the detector to collect data. The biggest advantage of this collimator is that there is no need to move the patient to take two images. In other words,
To enable an examination when it is not desirable for a patient to undergo a long examination, or when changing the position of the camera is undesirable in terms of location or time. This ensures accurate anatomical and geometrical recording of all examinations for both fields over the series of examinations.

However, the collimator holes, which are the passage of radiation, have many parallel holes that are tilted in opposite directions on the left and right sides of the central axis as a boundary (data is acquired at an angle of 30 degrees with respect to the center on each side). From the relationship consisting of
When performing RI imaging of an organ using a bilateral collimator, connect the central axis of the organ, especially the symmetrical organ, and the central axis of the collimator (the midpoint of the left and right inclined holes that intersect through the center of the disc-shaped collimator). In conventional devices, the operator visually checked the lines drawn on the collimator surface and the patient's organs to determine the position. However, since it does not confirm the parallelism of the two central axes, it is inaccurate and time-consuming.

This invention solves the above problems and facilitates patient positioning by embedding a light source along the central axis of the bilateral collimator.

The drawings will be explained below. 1, 2, and 3 are a top view, a horizontal cross-sectional view (-' cross-sectional view), and a vertical side cross-sectional view (-' cross-sectional view) of the bilateral collimator of the present invention; Bilateral collimator, 2 is symmetrical organ, 3 is
Radiation (γ) caused by RI (radioisotope)
4 is an example of a hole on the left side through which radiation 3 passes, 5 is an example of a hole on the right side, and 6 is the wall of the hole, which is usually made of a material such as lead that does not allow radiation to pass through. Reference numeral 7 denotes a V-shaped portion with no hole formed along the central axis 0 of the collimator 1, 8 an optical system such as a lens or slit, and 9 an external light source 11 disposed along the central axis 0 of the collimator 1. The glass fiber 10 that guides the light is a glass fiber branch tube that branches the light traveling straight through the glass fiber 9 and directs it toward the target organ 2. Note that the glass fiber 9 and the glass fiber branch tube 10 form a linear light source having a central axis 0. The V-shaped part 7 is bilateral
This part exists only in the collimator and cannot be used effectively as a collimator, but this part of the collimator is removed and the optical system 8, glass fiber 9, etc. are embedded together with a translucent material. 2 obtained with bilateral collimator
The directional image is developed bilaterally (from the lateral direction bilaterally) in a direction determined by the relative position of the collimator and the organ, and this direction of development and the central axis of the bilateral collimator are orthogonal. Therefore, when performing RI imaging, it is necessary to align the center line of the symmetrical organ 2 with the center axis of the bilateral collimator. In this device, a glass fiber 9, a branch pipe 10, and an optical system 8 embedded in a V-shaped portion 7 transmit light from an external light source 10 toward a symmetrical organ 2, and the light projected onto the organ 2 is Since the central axis 0 of the bilateral collimator 1 is displayed, relative positioning of the collimator and the symmetrical organ can be performed very easily and accurately.

In the embodiment shown in FIG. 2, the external light source is introduced using a glass fiber, and the branch pipe 10 creates a linear light source with a point light source array. Often, instead of a light emitting diode, a long small lamp that emits light continuously can be embedded to create a linear light source.In addition, a mirror can be attached along the central axis of the collimator to reflect light from the outside, or a slit can be used. It is also possible to narrow it down. In short, any optical projection means that projects and displays the central axis of the bilateral collimator will produce the same effect.

With this invention, the relative positioning of the collimator and the organ can be made extremely easy without impairing the essential functions of the bilateral collimator, and the excellent functions of the bilateral collimator can be exhibited. A very useful effect was achieved in practice. Furthermore, since the linear light source and the optical system for condensing and projecting light are embedded within the bilateral collimator, there is no problem in handling.

[Brief explanation of the drawing]

FIG. 1 is a top view of the present invention, FIG. 2 is a lateral cross-sectional view of the present invention, and FIG. 3 is a longitudinal cross-sectional view of the present invention. 1... Bilateral collimator, 2... Symmetrical organ, 3... Radiation by RI, 7... Collimator central axis V-shaped part, 8... Optical system, 9... Glass fiber, 10... Glass fiber branch tube , 11...
External light source.

Claims (1)

[Scope of utility model registration request] In a collimator in which a large number of parallel holes are formed that are inclined in opposite directions with a central axis as a boundary, a linear light source that indicates the central axis in a V-shaped part along the central axis where no holes are formed, and a linear light source that shows the central axis. A bilateral collimator characterized by having an embedded optical system that condenses and projects light onto a subject.