CN100461835C - A light-transmitting conversion optical image system of an X-ray machine - Google Patents

Abstract

A light-transmitting optical imaging system of an X-ray machine is composed of a CCD, a CCD lens, a filter and a stepping motor. The neutral filter is arranged between the image intensifier and the CCD lens, and the neutral filter Installed on the moving mechanism of the optical filter, the mechanism is driven by a stepping motor and equipped with mechanical limit and optical coupler positioning detection. The invention can acquire images with high signal-to-noise ratio with high stability and low cost.

Description

A kind of printing opacity transform image optical system of X line machine

Technical field

The invention belongs to the Medical Instruments technical field, relate to a kind of image pickup part of X line machine.

Background technology

Image optical system is to use the imaging and the pretreatment unit of the X line machine of image amplifier.IMAQ has two kinds of methods, 1, the perspective of low dosage, the fluorescence of the cutout screen of image amplifier directly arrives the camera lens of CCD, 2, the Exposure mode of high dose, the output fluorescence of image amplifier surpasses perspective tens times, in the attenuation process that luminous flux must be arranged before the camera lens of CCD, otherwise CCD is with saturated.

At present, image pickup for the mode of exposing, the image optical system that uses in the international mainstream type has 4 kinds of patterns, the 1st, only use of the adjusting of electronic aperture as luminous flux, 2 are to use neutral colour filter (luminous flux is 40%) to cooperate the adjusting of electronic aperture as luminous flux, the 3rd, in the tandem lens system, use electronic aperture, the 4th, in the tandem lens system, use neutral colour filter (luminous flux is 40%) to cooperate electronic aperture.Electronic aperture in these patterns uses step motor control, needs to proofread and correct, and filter also needs motor or rotary solenoid control.If use the combination of filter and aperture, control structure complexity then, cost height.If only use electronic aperture, following problem is arranged: 1, in non-tandem lens system, the aperture of control is the inside aperture of CCD camera lens, in fact, and for the camera lens of CCD, its best optics point is only in position almost, aperture of promptly adjusting and focal length point, if use outside its aperture of Electric Machine Control, the aperture position that inclined to one side optimum excessively (is greater than or less than) more than a times, the optical property of camera lens has bigger change, influences picture quality.2, in the tandem lens system, controlled aperture is in the directional light light path of two camera lenses, and its adjusting can not make the optical property of CCD camera lens descend, and still, the cost of tandem lens system is very high, and volume is also bigger.

Summary of the invention

In order to guarantee collection image quality, improve stability, reduce the number of corrections of system, avoid because image quality decrease and the system problem that aperture and labyrinth cause, the invention provides a kind of printing opacity transform image optical system of X line machine.

The present invention is by CCD and CCD camera lens, filter, and stepping motor is formed.Neutral colour filter is located between image amplifier and the CCD camera lens, and neutral colour filter is contained on the filter motion, and this mechanism is a mechanical motion mechanism by step motor drive, band mechanical position limitation and optocoupler detection and localization.This mechanism is contained on the axle by intermediate shaft hole, and the mechanical motion mechanism of three cantilever arms is arranged, an arm installing filter, and one of them is the mechanical position limitation swing arm for two other arm, another blocks arm for optocoupler, blocks at optocoupler anti-dazzling screen is housed on the arm.The structure of system such as Fig. 1.The present invention only uses a neutral colour filter (luminous flux is 1.5%), be that thickness with metal coating is that the optical glass of 1.2mm is made, wavelength is 500-750nm, as the filter in the optical system, make the optical attenuation of image amplifier, improve the signal to noise ratio of image.Stepping motor is to adopt 12v4 phase composite stepper motor.Stepper motor driver is the one pole constant voltage driving that 4 phases 8 are clapped under the excitation modes.The CPU of circuit for controlling motor is 89C2051.The action control of filter is accomplished accurate location by step motor control, band FEEDBACK CONTROL, band mechanical position limitation; Filter is greater than 500 less than 700ms operate time, and rotational angle is 70 °, the location

1, step motor control plate: by the singlechip control panel that 89C2051 constitutes, be responsible for finishing software control to stepper motor driver, motor positioned detection, mechanical position limitation overtime protection with communicate by letter with the action of remote control master computer.See accompanying drawing 4.

2, optocoupler detection and localization: on the mechanical part that filter is installed,, also have two ends except an end of filter, the one, optocoupler blocks end, and the one, the mechanical position limitation end.Be specially, as Fig. 3, when filter rotates, optocoupler blocks end also synchronously in rotation, optocoupler detection and localization plate has two optocouplers, blocks end and guarantees to block two optocouplers respectively in raw bits and act bit, makes the CPU of step motor control plate can collect the position that filter moves.Owing to be the detection of noncontact, so the reliability height.

3, mechanical stop limiter: aforesaid mechanical position limitation end, with the synchronous rotation of filter, in the outside, position that guarantees that filter puts in place, the post of two metals is arranged respectively, the software of detection and localization inefficacy or CPU is interfered when breaking down, and the rotation of filter is restricted.The stepping motor of selecting for use is the motor that can support stall.Purpose is in order to guarantee that when fault is arranged filter can not damage.

4, with the communicating by letter of remote control master computer: the operating room of X line machine has two, and one is a body chamber, i.e. the room at patient place, and one is the telecontrol room, promptly detects the room that the doctor operates the place.Master computer is in the telecontrol room.Master computer is connected with the cable of step motor control plate by 17 meters of treaties.Master computer sends two orders, promptly moves and playbacks, and receives a signal,, as long as stepping motor is then issued signal of master computer in motion, like this, promptly can realize the action control to filter that is.

The present invention can reach the image that collects high s/n ratio with high stability, low cost.

Description of drawings

Fig. 1 constitutes schematic diagram for system of the present invention,

Fig. 2 is filter motion of the present invention, detection and localization and mechanical position limitation schematic diagram,

Fig. 3 is a filter motion schematic diagram of the present invention,

Fig. 4 is a control system block diagram of the present invention.

Among the figure: 1 filter, 2 camera lenses, 3 stepping motors, 4 mechanical position limitation posts, 5 mechanical position limitation swing arms, 6 anti-dazzling screens, 7 optocouplers, 8 filter motions, 9 step motor control plates, 10 optocoupler detection and localization, 11 master computers, 12 optocouplers block arm.

Embodiment

Formation of the present invention as shown in Figure 1, by CCD and CCD camera lens 2, filter 1 and stepping motor 3 constitutes.Neutral colour filter 1 is located between image amplifier and the CCD camera lens 2, and filter 1 is installed on the filter motion 8.Stepping motor 3 adopts 12v4 phase composite stepper motor.Stepper motor driver: the one pole constant voltage driving, 48 clap excitation mode mutually.The optical glass of filter 1 usefulness band metal coating, 1.5% sees through, and thickness is 1.2mm, and wavelength is 500-750nm.The CPU of circuit for controlling motor 9 adopts 89C2051.1 operate time of filter is less than 700ms greater than 500.Filter 1 positioning accuracy is ± 1mm.Filter motion 8 is one to be contained in the mechanical motion mechanism that has three cantilever arms on the axle by intermediate shaft hole as shown in Figure 3, and one of them arm is equipped with neutral colour filter 1, and two other arm is that mechanical position limitation arm 5 and optocoupler block arm 12.

Claims (2)

1. the printing opacity transform image optical system of an X line machine, include CCD camera, CCD camera lens and filter, the filter that it is characterized in that this system is contained on the motion driven by stepper motors, and filter is that 1.2mm is thick, luminous flux is 1.5% optical glass.

2. the printing opacity transform image optical system of X line machine according to claim 1, it is characterized in that described filter motion is to be contained in the mechanical motion mechanism that has three cantilever arms on the axle by intermediate shaft hole, an arm installing filter, an arm is the mechanical position limitation swing arm, the another one arm is that optocoupler blocks arm, blocks at optocoupler anti-dazzling screen is housed on the arm.

Images