Medical CCD camera and corresponding X-ray machine exposure controlling method

A technology of X-ray machine and camera, applied in the field of medical X-ray imaging, can solve the problems of increasing the complexity of X-ray machine, high cost of ionization chamber and photomultiplier tube

Inactive Publication Date: 2006-08-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The exposure control method has several disadvantages: First, the addition of ionization chambers and photomultiplier tubes increases the complexity of the entire X-ray machine
Secondly, the cost of ionization chamber and photomultiplier tube is relatively high

Method used

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  • Medical CCD camera and corresponding X-ray machine exposure controlling method
  • Medical CCD camera and corresponding X-ray machine exposure controlling method
  • Medical CCD camera and corresponding X-ray machine exposure controlling method

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Experimental program
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Embodiment Construction

[0091] Such as figure 1 As shown, the inside of the dotted box is a CCD camera, which consists of the following modules:

[0092] 1) CCD chip 1

[0093] The CCD chip 1 is used to convert the optical signal of the image imager into an analog electrical signal; the camera lens optically focuses the output of the X-ray image imager on the CCD chip 1, and the analog signal of the CCD chip 1 is output to the analog-to-digital conversion module 3, The transfer level input of CCD chip 1 is from readout circuit 2; In video camera of the present invention, the CCD chip that adopts is the interline transfer CCD of Kodak Company, model name KAI-1020M, and resolution is 1004 * 1004; Interrow transfer The CCD is suitable for all control methods of the present invention, and the frame transfer CCD is suitable for the pre-exposure method and the short exposure method of the present invention.

[0094] 2) Readout circuit 2

[0095] The readout circuit 2 is composed of a level conversion ch...

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Abstract

The present invention discloses a medical CCD camera and correspondent X-ray machine exposure control method. Said invention utilizes short exposure, pre-exposure, first weak reading-out and secondary weak reading-out method to calculate the exposure termination time of this X-ray machine exposure. In the X-ray machine exposure control method the interface of X-ray controller is basically identical to the interface of traditional X-ray machine exposure controller, the CCD quick reading-out method can make the processes of pre-exposure, short exposure and weak reading-out, etc. be implemented within 1-several milliseconds, and the circuits of calculation module and time sequence control module can extensively select existent various embedded computing chips, including DSP, ARM and FPGA, so that it can calculate exposure time of X-ray machine within submillisecond level time, and can raise imaging quality of X-ray machine.

Description

technical field [0001] The invention belongs to the field of medical X-ray imaging, and relates to an automatic exposure control method and device in X-ray imaging, in particular to an X-ray machine automatic exposure control technology based on exposure prediction and calculation without traditional optical signal feedback and a corresponding camera . Background technique [0002] In X-ray imaging, generally speaking, the greater the radiation dose, the better the image quality. However, on the other hand, the greater the dose, the greater the harm to the patient. Therefore, automatic exposure control technology plays an extremely important role in X-ray imaging. [0003] The X-ray dose received by the patient is mainly determined by the tube voltage (kVp) of the X-ray machine, the product of the tube current and the setting time (mAs), the distance between the tube and the patient, and possibly the distance between the tube and the object. Any attenuation of the path is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B42/02A61B6/02H04N5/225H04N5/232
Inventor 牟轩沁邹屹洋
Owner XI AN JIAOTONG UNIV
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