JPH0124287B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stereoscopic X-ray cine imaging device for stereoscopically observing an image on a developed film taken by the stereoscopic X-ray cine imaging device.

[Conventional technology]

There are two types of stereoscopic X-ray cine imaging devices: a method using two cine cameras and a method using one cine camera.

The method of using two cine cameras is to take images from both the left and right focal positions on two films, and then perform stereoscopic X-ray cine observation of the taken and developed images on the two films. The device performs three-dimensional observation.

On the other hand, the method of using only one cine camera is
This is a method in which images from both the left and right focal positions are taken alternately on a single film, and when the images on the film that have been taken and developed are viewed in 3D using a 3D X-ray cine observation device, glasses with shutters are conventionally used. etc., to alternately view left and right bifocal images with only the left eye or only with the right eye.

[Problem to be solved by the invention]

According to the above-mentioned method of using two cine cameras, it is possible to perform stereoscopic observation without being bothered by screen flickering, etc., but the mechanism of the device is complicated, requires a lot of space, and the weight of the device increases. There are some problems. Further, there are problems in that it takes twice as much time and effort for development processing, etc., and it is difficult to finish two films with the same gradation.

On the other hand, the method using one cine camera does not have the above disadvantages of the method using two cine cameras, but the amount of information per unit time is reduced because the image is viewed alternately with only one eye. There is a problem that the signal is reduced by half, which causes flickering of the image and a decrease in the signal-to-noise ratio. Furthermore, if the film is held still, it will no longer be possible to observe it as a three-dimensional image.

This invention provides that even when performing stereoscopic X-ray cine photography using one cine camera, the image quality is equivalent to or higher than that when two cine cameras are used without increasing the film feed speed. The object of this invention is to provide a three-dimensional X-ray cine imaging apparatus which can obtain three-dimensional images and which can perform three-dimensional observation even when the film is stationary.

[Means to solve the problem]

In this invention, as a means for achieving the above object, a stereoscopic X-ray cine observation apparatus is configured as follows. That is, the stereoscopic X-ray cine observation apparatus according to the present invention is an apparatus for stereoscopic observation of X-ray cine images in which left and right images of a subject are alternately photographed one frame at a time along the longitudinal direction of the film. a projection system that projects images in a superimposed manner onto a screen; and a movable polarizing plate that is arranged in the optical path of each of the projection systems so that the plane of polarization has a phase relationship that is alternately orthogonal to each other, and that the phase relationship can be switched. a pair of left and right fixed polarizing plates whose polarization planes are orthogonal to each other and which are arranged behind the screen to correspond to the observer's eyes; and a switching means for moving the movable polarizing plate and switching the phase relationship in synchronization with the frame feeding of the film by the film feeding mechanism; The structure is characterized in that the corresponding left and right images of the film are guided respectively.

[Effect]

When observing an X-ray cine image in which left and right images of a subject are taken alternately one frame at a time along the longitudinal direction of a film using the stereoscopic X-ray cine imaging device configured as described above, it is necessary to The images are projected onto the screen by the projection system, and the left and right images are projected onto the screen through the respective polarization planes of the movable polarizing plate having a mutually orthogonal phase relationship, In addition, since the images are guided to a pair of left and right fixed polarizing plates having polarization planes perpendicular to each other, images captured through the pair of left and right fixed polarizing plates disposed corresponding to the left and right eyes of the observer. An observer who observes the left and right images simultaneously sees the left image with the left eye and the right image with the right eye, allowing the observer to observe the image on the film in three dimensions. .

Even if the film is fed one frame at a time by the film feeding mechanism, and the left and right images on the film are alternately positioned in each projection system, the timing is synchronized with the frame feeding of the film by the film feeding mechanism. Since the movable polarizing plate is moved by the switching means and the phase relationship thereof is also switched, the left image is always the left eye, and the right image is always visible through the pair of left and right fixed polarizing plates arranged corresponding to the left and right eyes of the observer. is viewed with the right eye, allowing the viewer to continuously observe the images on the film in three dimensions.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram schematically showing a schematic configuration of a stereoscopic X-ray cine imaging apparatus according to an embodiment of the present invention. As shown in the figure, this stereoscopic X-ray cine imaging apparatus includes a projection system consisting of a light source 11, a screen 12 on which an image on a film 21 is projected by the projection system, and a pair of polarized lights having a mutually orthogonal phase relationship. a movable polarizing plate 13 having a surface and disposed in the optical path of the projection system between the light source 11 and the screen 12;
A pair of left and right fixed polarizing plates 14, which are disposed behind the screen 12 in correspondence with the observer's eyes, and whose polarization planes are orthogonal to each other, a film feeding mechanism (not shown) that feeds the film 21 one frame at a time, and this film feeding mechanism. A switching means (not shown) is provided for rotating the movable polarizing plate 13 by 180 degrees in synchronization with frame-by-frame feeding of the film 21 by the mechanism and switching the phase relationship. The film 21 is configured to run either between the light source 11 and the movable polarizing plate 13 or between the movable polarizing plate 13 and the screen 12. In addition, in this example, the movable polarizing plate 13
The switching is performed by rotating the movable polarizing plate 13 by 180 degrees in synchronization with the frame advance of the film 21, but a sliding type may also be used. Also, light source 1
1 does not necessarily have to consist of a pair of left and right lights, but the light from one light source is converted into two different plane polarized lights by the movable polarizing plate 13, and these plane polarized lights are respectively displayed as a left focus image and a right focus image on the film 21. Alternatively, the image may be irradiated.

Next, a procedure for observing a stereoscopic image using the stereoscopic X-ray cine observation apparatus according to the present invention will be explained based on FIGS. 2 to 5.

First, as shown in Fig. 2, a stereoscopic X-ray cine imaging device using one cine camera is used to perform cine imaging by alternately emitting X-rays from the left focal position L and the right focal position R. Do this. In the figure, 22 is an X-ray tube for stereoscopic imaging, 23 is a fluorescent image brightness intensifier, and 2
4 indicates a cine camera. As shown in FIG. 3, on the photographed film 21, left and right images of the subject are photographed alternately and in chronological order one frame at a time along the longitudinal direction of the film 21. In the figure,
Ln, Ln+1, Ln+2, ... indicate images taken and developed from the left focal position L, Rn-1, Rn,
Rn+1, . . . indicate images taken from the right focal position R and developed. These images are then stereoscopically observed using the stereoscopic X-ray cine observation device as described below.

First, as shown in FIG. 4, light emitted from the light source 11-1 passes through a portion 13L of the movable polarizing plate 13 having a horizontal polarization plane, and horizontal plane polarized light is created. This plane polarized light is transferred to the film 21
Project the upper left focus image Ln onto the screen 12,
The viewer views this image with his left eye through the portion 14L of the fixed polarizing plate 14 having a horizontal polarization plane. On the other hand, the light emitted from the light source 11-2 is
Portion 13 of the movable polarizing plate 13 having a vertical polarization plane
It passes through R and creates longitudinally plane polarized light. This plane polarized light is the right focus image Rn on the film 21.
on the screen 12, the adjacent left focus image
The image is projected onto Ln, and the viewer sees this image with his right eye through the portion 14R of the fixed polarizing plate 14 having a vertical polarization plane. Therefore, the viewer simultaneously views the left focused image Ln with his left eye and the right focused image Rn with his right eye, and can observe the image on the film 21 in three dimensions.

Next, as shown in FIG. 4, the film 21 is fed one frame, and the movable polarizing plate 13 is rotated 180 degrees in synchronization with this feeding. In this state, the light irradiated from the light source 11-1 passes through the portion 13R of the movable polarizing plate 13 having a vertical polarization plane, and creates vertical plane polarized light. This plane polarized light projects the right focus image Rn on the film 21 onto the screen 12, and the viewer sees this image with his right eye through the portion 14R of the fixed polarizing plate 14 having a vertical polarization plane. On the other hand, light source 11-2
The light emitted from the movable polarizing plate 13 passes through a portion 13L having a horizontal polarization plane, and horizontal plane polarized light is created. This plane polarized light is
The left focus image Ln+1 on 1 is placed on the screen 12,
It is projected onto the adjacent right focus image Rn, and the viewer sees this image with his left eye through the portion 14L of the fixed polarizing plate 14 having a horizontal polarization plane. Therefore, the viewer simultaneously views the right focused image Rn with his right eye and the left focused image Ln+1 with his left eye, and can observe the image on the film 21 in three dimensions.

In the same manner, each time the film 21 is fed one frame, the movable polarizing plate 13 is moved in synchronization with the feeding.
The image is rotated by 180 degrees, and the viewer always views the left focus image with the left eye and the right focus image with the right eye, thereby viewing the image as a stereoscopic image. The order of observation is as shown in FIG.

〔Effect of the invention〕

Since the present invention is constructed and operates as described above, if the stereoscopic X-ray cine observation device according to the present invention is used, stereoscopic Even when cine photography is performed, the information that enters one eye due to stereoscopic X-ray cine observation is 2
It will be doubled. Therefore, smooth stereoscopic images without flickering can be viewed without increasing the film feed speed. Furthermore, according to the stereoscopic X-ray cine observation apparatus according to the present invention, images from both the left and right focal positions are always viewed simultaneously by the left and right eyes, so regardless of the film feed speed, even when the film is stationary. This device also has an advantage in this respect, since it can be observed as a three-dimensional image even if the image is

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the general configuration of a stereoscopic X-ray cine imaging apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram schematically showing a stereoscopic X-ray cine imaging apparatus using one cine camera. FIG. 3 is a diagram showing the order in which images are arranged on the film taken by the device shown in FIG. 2, and FIG. FIG. 5 is a diagram for explaining the procedure for observing images on a film using the stereoscopic X-ray cine observation apparatus according to the invention, and FIG. 5 is a diagram for explaining the order of observation. 11...Light source, 12...Screen, 13...
Movable polarizing plate, 14...Fixed polarizing plate, 21...Film, Ln, Ln+1, Ln+2,...Left focus image, Rn-1, Rn, Rn+1,...Right focus image.

Claims (1)

[Claims] 1. In a stereoscopic observation device for X-ray cine images in which left and right images of a subject are alternately taken one frame at a time along the longitudinal direction of a film, a projection system that projects adjacent images of the film onto a screen in a superimposed manner; a movable polarizing plate arranged in the optical path of each of the projection systems so that the polarization planes have a phase relationship that is alternately orthogonal to each other and whose phase relationship can be switched; and a movable polarizing plate located behind the screen that corresponds to the observer's eyes a pair of left and right fixed polarizing plates whose polarization planes are orthogonal to each other; a film feeding mechanism that feeds the film one frame at a time and alternately positions left and right images on the film in each of the projection systems; A switching means is provided for moving the movable polarizing plate and switching the phase relationship in synchronization with frame-by-frame feeding of the film by the mechanism, so that corresponding left and right images of the film are guided to each of the pair of left and right fixed polarizing plates. A stereoscopic cine observation device characterized by the following.