WO2018190476A1

WO2018190476A1 - Cr system and method using spiral scan scheme

Info

Publication number: WO2018190476A1
Application number: PCT/KR2017/009787
Authority: WO
Inventors: 이성운; 남호철
Original assignee: (주)레보스케치
Priority date: 2017-04-10
Filing date: 2017-09-07
Publication date: 2018-10-18
Also published as: KR101883102B1

Abstract

The present invention relates to a CR system using a spiral scan scheme, comprising: a body; a rotating motor for rotating an image plate to be exposed to X-rays, in order to perform diagnosis, on one side of the inside of the body; a scan motor for rotating a scan arm on the other side of the inside of the body; a PSL scan head attached to an end of the scan arm to receive PSL; a control unit for controlling the rotating motor, the scan motor, and the PSL scan head; and a microprocessor for processing and transmitting an X-ray latent image of the image plate through the PSL scan head.

Description

CR system and method using spiral scan method

The present invention relates to a CR system and method, and more particularly, to a CR system and method for reading an X-ray latent image of an image plate using a spiral scan method.

Radiological images such as X-ray images are widely used in the medical field for the diagnosis of medical conditions. In particular, the Computed Radiography (CR) system has been widely used in the field of X-ray imaging by successfully replacing an analog system using a film screen.

The CR system uses an image plate coated with a fluorescent material that replaces an existing film, and acquires digital image information after reading an image plate in which X-ray information is accumulated with a reader. More specifically, when X-rays are irradiated onto the image plate, a latent image proportional to the amount of radiation transmitted through the subject remains on the image plate.

When the red laser is scanned to acquire an image of the image plate, the applied fluorescent material is expressed as photostimulated luminescence (PSL) in response to the red light. This PSL is transmitted to the optical multiplier along the optical waveguide, amplified, and then converted into a digital signal through an AD converter and displayed as an image.

Conventional CR systems, however, require complex and sensitive scanning optics such as multifacets, F-theta lenses and cylinder lenses to scan the laser over the entire area to be scanned. It takes a long time and requires a large area of optical waveguides and photomultipliers for receiving PSL, which results in an increase in X-ray exposure of the patient due to low efficiency due to the reduction in the amount of received light.

An object of the present invention for solving the above problems is to provide a CR system and method using a spiral scan method that can reduce the scan time for reading the X-ray latent image of the image plate, and obtain a high-resolution image with high efficiency There is.

CR system using a spiral scanning method of the present invention for achieving the above object is a body; A rotating motor for rotating the image plate exposed to the X-ray for diagnosis on one side of the body; A scan motor for rotating the scan arm on the other side of the body; A PSL scan head attached to an end of the scan arm to receive a PSL; A control unit for controlling the rotating motor, the scan motor, and the PSL scan head; And a microprocessor for processing and transmitting an X-ray latent image of the image plate through the PSL scanhead.

The image plate is characterized in that mounted to the cartridge plate. The cartridge plate is formed by inserting three circular magnets, characterized in that the triangular groove is formed in the center of the lower side of the cartridge plate is coupled to the triangular protrusion of the cartridge mount.

The rotating motor is characterized in that for rotating the cartridge mount coupled to the cartridge plate on which the image plate is mounted.

The cartridge plate is characterized in that it further comprises a rotation motor encoder for controlling the rotation speed so that the rotation speed difference occurs according to the position of the scan arm to scan a uniform micro-area.

The scan arm passes the PSL scanhead through the scan motor to the center at the outermost part of the image plate. The first PSL of the image plate is received along the spiral orbit, and the second PSL is received while moving the PSL scan head from the center point to the outermost side of the image plate.

The scan arm is moved according to the resolution set by the scan motor encoder.

The PSL scan head includes a light emitting unit and a light receiving unit, and the light emitting unit forms a spot through a collimating lens and a focusing lens of a laser beam generated from a laser diode.

The light receiving unit converts the PSL received through the condenser lens into an electronic signal through a semiconductor sensor, and the converted electronic signal is amplified by an amplifier and then transferred to a delimiter to determine the number of photons at high speed.

The rotary motor and the scan motor are each characterized by having a uniform micro scan area suitable for the set resolution by variably controlling the set speed and position through the rotary motor encoder and the scan motor encoder.

In addition, the CR method using the spiral scanning method of the present invention comprises the steps of mounting the image plate to the cartridge plate; While rotating the image plate with the rotary motor, the PSL scan head mounted at the end of the scan arm simultaneously passes the center at the outermost portion of the image plate through the scan motor. Receiving a primary PSL of an image plate along a spiral orbit and receiving a secondary PSL while moving the PSL scanhead from the center point to the opposite outermost side again; Converting the received PSL into an electronic signal through a semiconductor sensor, and amplifying the converted electronic signal by an amplifier and transferring the converted electronic signal to a delimiter; Transferring the signal of the delimiter to the FPGA to generate an optical signal size from which thermal noise is eliminated through integrator processing; And acquiring an X-ray latent image image of the image plate according to the generated optical signal through a microprocessor.

And transmitting the latent X-ray image of the acquired image plate to a PC through Ethernet, WIFI, or USB.

As described above, according to the present invention, the spiral scanning method significantly reduces the scan time for reading the X-ray latent image of the image plate, and provides a high duty cycle and a wide dynamic range in two scanning processes. It is effective to obtain high resolution images with high efficiency such as range and high collection.

1 is a cross-sectional view of a CR system using a spiral scan method according to an embodiment of the present invention.

2 is a perspective view of a cartridge according to an embodiment of the present invention.

3 is a plan view of a CR system using a spiral scan method according to an embodiment of the present invention.

4 is a cross-sectional view of a PSL scanhead according to an embodiment of the present invention.

5 is a block diagram of a CR system using a spiral scan method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention.

Next, a CR system and a method using a spiral scan method according to an embodiment of the present invention will be described.

1 is a cross-sectional view of a CR system using a spiral scanning method according to an embodiment of the present invention, Figure 2 is a perspective view of a cartridge according to an embodiment of the present invention, Figure 3 is a spiral according to an embodiment of the present invention 4 is a plan view of a CR system using a scan method, FIG. 4 is a cross-sectional view of a PSL scan head according to an embodiment of the present invention, and FIG. 5 is a block diagram of a CR system using a spiral scan method according to an embodiment of the present invention. .

1 to 5, the CR system using the spiral scanning method of the present invention rotates the body 10 and the image plate 100 exposed to the X-ray for diagnosis on one side of the body 10. A motor 20, a scan motor 40 for rotating the scan arm 80 inside the body 10, and a PSL scan head attached to an end of the scan arm 80 to guide and receive PSL ( 90, an X-ray latent image of the image plate 100 through the controller 200 for controlling the rotating motor 20, the scan motor 40, and the PSL scan head 90, and the PSL scan head 90. It can be configured to include a microprocessor 300 for processing and transmitting the image.

The image plate 100 may be mounted to the cartridge mount 70 after insertion into the cartridge 60. That is, the image plate 100 is inserted between the cartridge cover 60a coupled to the cartridge plate 60b to be mounted on the cartridge mount 70, and then the cartridge cover 60a is peeled off to release the X-ray of the image plate 100. The latent image is read.

Here, three circular magnets 61 are inserted into the cartridge plate 60b, and a triangular groove 62 is formed at the center of the lower side of the cartridge plate 60b to form a triangular protrusion of the cartridge mount 70. Combined with (71). At this time, the three circular magnets 61 inserted into the cartridge plate 60b also serve to couple with the cartridge mount 70.

The rotary motor 20 rotates the cartridge mount 70 coupled with the cartridge plate 60b. As a result, the image plate 100 mounted on the cartridge plate 60b is rotated.

Here, the cartridge plate 60b may generate a difference in rotational speed depending on the position of the scan arm, and may be controlled at a variable speed by using the rotary motor encoder 30 to match the target rotational speed.

The scan arm 80 mounts a PSL scan head 90 at an end to acquire an X-ray latent image of the image plate 100, and attaches the PSL scan head 90 to the image plate 100 through the scan motor 40. Passing through the center from the outermost of Move to circular orbit 64 to receive the primary PSL of image plate 100 along spiral orbit 63, and move the PSL scanhead 90 back from its center to the outermost side of the image plate opposite the secondary PSL. After two spiral scans, a wide dynamic range can be secured in two scans in the process of converting the latent image into a PSL by a laser. Here, the scan arm 80 can be precisely position controlled by the scan motor encoder 50.

The rotary motor 20 and the scan motor 40 may have a uniform micro scan area suitable for the set resolution by controlling the set speed and position through the rotary motor encoder 30 and the scan motor encoder 50, respectively.

The PSL scan head 90 includes a light emitter 91 and a light receiver 95.

Unlike the conventional scanning optical system, the light emitting unit 91 may be designed as a point light source, and includes a collimator lens 93 and a focusing lens 94 as a light source using a laser diode 92 having a wavelength of 600 nm, and the light receiving unit 95. ) Is composed of a semiconductor sensor 96, a condenser lens 97, and a blue filter 98 in place of a conventional photo multiplier tube (PMT), which is largely affected by a large magnetic field. Here, since the semiconductor sensor 96, the condenser lens 97, and the blue filter 98 of the light receiving unit 95 are conventional techniques already known and implemented before the present application, a detailed description thereof will be omitted. .

Here, the light emitting unit 91 and the light receiving unit 95 of the PSL scan head 90 may be disposed having a coaxial arrangement or an angle using a dichroic mirror.

In one embodiment, the light receiving unit 95 is configured to be perpendicular to the image plate 100 in order to increase the light receiving efficiency of the PSL, the light emitting unit 91 for minimizing light reflected by the image plate 100. Can be placed with an angle.

The controller 200 is responsible for controlling all devices for image acquisition. That is, the controller 200 controls the light emitting unit 91 and the light receiving unit 95 constituting the rotary motor 20, the scan motor 40, and the PSL scan head 90.

The rotary motor 20 controls the target speed of the cartridge 60 through the motor driver based on the position value of the rotary motor encoder 30, the target speed is so that the distance sampled per unit time is constant (external angle) In the rotational speed is low and the rotational speed increases toward the center) to control the target speed based on the position information of the scan motor encoder (50).

The scan motor 40 controls the scan arm 80 through a motor driver based on the position value of the scan motor encoder 50 in order to move the position corresponding to a predetermined resolution.

The light emitting unit 91 forms a spot having a designed size by passing a laser beam generated from the laser diode 92 through a laser driver through a collimating lens 93 and a focusing lens 94, which are laser optical systems.

The light receiver 95 transmits only the PSL filtered by the blue filter 98 to the semiconductor sensor 96 through the condenser lens 97. The transmitted PSL is converted into an electronic signal and then amplified through an amplifier and delivered to a discriminator. At this time, the delimiter determines the number of photons at that time at a high speed.

The signal of the delimiter is transmitted to the FPGA 200, and the FPGA 200 performs a window sum process having a constant size at a high speed to generate the size of the PSL from which the thermal noise is removed.

Here, the semiconductor sensor 96 has a high time resolution so that sampling in GHz is possible. By using this, the PSL signal is obtained through an integrator (Window sum) having a certain number of samples of the number of photons for a specific time. The advantage of this method is that the thermal noise of all semiconductor sensors is smaller than the signal generated by one photon, so that thermal noise can be fundamentally separated from the video signal. As a result, the amount of noise is significantly reduced, resulting in an increase in the signal-to-noise ratio (SNR), resulting in a very high quality image.

In the present invention, by applying a semiconductor sensor, it is possible to configure a small light-receiving unit which is not affected by the magnetic field as compared to the conventional PMT, and can realize a low noise level and high image performance.

The microprocessor 300 acquires an X-ray latent image of the image plate 100 through the FPGA 200.

At this time, the microprocessor 300 communicates with the PC through the Ethernet 401, WIFI 402, USB 403, and transmits the device control and the acquired image.

Hereinafter, a CR method using the spiral scan method of the present invention will be described.

First, the image plate 100 is mounted on the cartridge plate 60b.

Subsequently, while rotating the image plate 100 through the rotary motor 20, the PSL scan head 90 mounted at the end of the scan arm 80 may be inserted into the image plate 100 through the scan motor 40. Receiving the primary PSL along the spiral orbit 63 to rotate the image plate 100, which rotates the center to the circular orbit 64 at the outer shell, and the PSL scan head 90 is again the center of the image plate 100 Receive the second PSL while moving to the outermost side.

At this time, the received PSL is converted into an electronic signal through a semiconductor sensor, and the converted electronic signal is amplified by an amplifier and then transferred to a discriminator. At this time, the delimiter determines the number of photons at that time at a high speed, the signal of the delimiter is transmitted to the FPGA 200, the FPGA 200 is a high-speed constant integrator (Window sum) processing To generate the size of the thermal noise canceled PSL.

Subsequently, an X-ray latent image of the image plate 100 according to the generated PSL size is obtained through the microprocessor 300.

Finally, the acquired latent image is transmitted to a PC through Ethernet 401, WIFI 402, and USB 403.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

Body;

A rotating motor for rotating the image plate exposed to the X-ray for diagnosis on one side of the body;

A scan motor for rotating the scan arm on the other side of the body;

A PSL scan head attached to an end of the scan arm to receive a PSL;

A control unit for controlling the rotating motor, the scan motor, and the PSL scan head; And

And a microprocessor for processing and transmitting an X-ray latent image image of the image plate through the PSL scan head.
The method of claim 1,

The image plate is CR system using a spiral scan method, characterized in that mounted to the cartridge plate.
The method of claim 2,

The cartridge plate is composed of three circular magnets are inserted, the CR system using a spiral scan method, characterized in that a triangular groove is formed in the center of the lower side of the cartridge plate is coupled to the triangular protrusion of the cartridge mount.
The method of claim 1,

The rotating motor is a CR system using a spiral scan method, characterized in that for rotating the cartridge mount coupled to the cartridge plate on which the image plate is mounted.
The method of claim 2,

The cartridge plate CR system using a helical scan method further comprises a rotation motor encoder for controlling the rotation speed so that the rotation speed difference occurs according to the position of the scan arm to scan a uniform micro-area.
The method of claim 1,

The scan arm passes the PSL scanhead through the scan motor to the center at the outermost part of the image plate. Spiral scanning method characterized in that the first PSL of the image plate is received along the spiral orbit and the second PSL is received while moving the PSL scan head from the center point to the outermost side of the image plate. CR system used.
The method of claim 1,

The scan arm is a CR system using a spiral scan method, characterized in that for moving according to the resolution set by the scan motor encoder.
The method of claim 1,

The PSL scan head includes a light emitting part and a light receiving part.

The light emitting unit CR system using a helical scan method, characterized in that for forming a spot through the laser beam generated from the laser diode through the collimating lens and the focusing lens.
The method of claim 8,

The light-receiving unit converts the PSL received through the condenser lens into an electronic signal through a semiconductor sensor, and the converted electronic signal is amplified by an amplifier and transferred to a delimiter to determine the number of photons at high speed. CR system using scan method.
The method of claim 1,

The rotating motor and the scan motor are CR systems using a helical scan method, characterized in that each of the rotation motor encoder and the scan motor encoder by varying control the speed and position set to have a uniform micro scan area suitable for the set resolution.
Mounting the image plate to the cartridge plate;

While rotating the image plate with the rotary motor, the PSL scan head mounted at the end of the scan arm simultaneously passes the center at the outermost portion of the image plate through the scan motor. Receiving a primary PSL of an image plate along a spiral orbit and receiving a secondary PSL while moving the PSL scanhead from the center point to the opposite outermost side again;

Converting the received PSL into an electronic signal through a semiconductor sensor, and amplifying the converted electronic signal by an amplifier and transferring the converted electronic signal to a delimiter;

Transferring the signal of the delimiter to the FPGA to generate an optical signal size from which thermal noise is eliminated through integrator processing; And

And acquiring an X-ray latent image image of the image plate according to the generated optical signal through a microprocessor.
The method of claim 11,

And transmitting the latent X-ray image of the acquired image plate to a PC through Ethernet, WIFI, or USB.