EPID

EPID plays an important role in quality assurance of radiotherapy accessories including multileaf collimator ( MLC ) that has been most studied in the past couple of years .

电子射野影像系统在放疗元件的质量保证中也起到重要的作用，近年来在这方面的研究主要是对多叶光阑质量保证。

Conclusion Based on our dosimetry study , as an electronic portal imaging system , the EPID can easily be developed into an dosimetry system for transit dose distribution measurement .

结论研究证明，电子射野影像系统完全可以成为一套剂量仪系统。

EPID for Set-up Errors Analysis and Quality Assurance of Radiotherapy in Head and Neck Cancer

电子射野影像系统（EPID）在头颈部肿瘤放射治疗中的摆位误差分析及质量控制

Microcapsule electrophoretic image display ( EPID ) is one of the most important technology for realizing flexible display .

微胶囊电泳显示电子墨水技术（EPID）是实现柔性显示的重要技术之一。

The dose response is strongly influenced by image acquisition mode including pulse repitition frequency and EPID sampling mode .

EPID剂量响应与图像获取模式（加速器脉冲重复频率、EPID取样模式）关系密切。

The application of EPID in radiotherapy

放射治疗射野影像系统的应用

An important problem of the electrophoretic image display ( EPID ) - the preparation and stability of suspension is studied in this paper .

本文研究了电泳图象显示器的一个关键问题&显示液的制备与稳定性。

The images are also given the dose distribution at the plane of EPID , so they can be used for dose verification during treatment .

EPID图像也反映了测量平面的剂量分布，因此可能用于放射治疗的剂量学验证。

OBJECTIVE : To investigate organs motion during radiotherapy using electronic portal image device ( EPID ) so that to automatically inspect on the treatment region .

目的：用电子射野影像装置研究放射治疗过程中的器官运动，以便对治疗部位进行自动监测。

Purpose Firstly , to investigate the dose response characteristics and its influenced factors of a scanning liquid ion-chambe electronic portal imaging device ( EPID ) .

目的首先，研究扫描液体电离室型电子射野影像系统（EPID）的剂量响应特性及其各种影响因素。

To obtain the dose response curve , the relationship between the incident radiation intensity to the detector and the pixel value output from the EPID were established .

为了得到剂量响应曲线，需要建立入射到探头的射线强度与EPID像素值之间的关系。

Use EPID system verify beam shape , can test electric grating leaves in place precision , ensure the dose distribution of TPS design in patients in the human body can achieve .

利用EPID系统进行射野形状验证，可以检验电动光栅叶片的到位精度，保证TPS设计的剂量分布能在患者人体中实现。

With advanced knowledge about the dosimetry characteristics of EPID , the use of EPID for dosimetry verification was adapted from the research study to the clinic .

随着对电子射野影像系统的剂量学特性的不断了解，用它进行剂量学验证也开始从实验室研究走向临床应用。

Electronic portal imaging system ( electronic portal imaging device , EPID ), is a newly-developed technology which is applied in portal positioning authentication to reduce the error of exposure .

电子射野影像系统（ElectronicPortalImagingDevice，EPID），是近年来发展的用于进行射野定位验证减少照射误差的新技术。

To investigate the set-up error in intensity modulated radiotherapy ( IMRT ) with electric portal image device ( EPID ) in nasopharyngeal carcinoma ( NPC ) .

用电子射野图像器件（EPID）拍摄的射野片研究调强放疗治疗鼻咽癌过程中的摆位误差。

After dose verification plan is passed , we get the position verification through net before treat , the portal films are screened using the electronic portal imaging device ( EPID ) .

在剂量验证计划通过后，治疗前通过放疗网络调出位置验证计划，利用电子射野影像系统（ElectronicPortalImagingDevice.EPID）拍摄患者正侧位的数字射野图像。

Then , based on retinal cortex theory , we can estimate the effective radiation image , and apply it to EPID image enhancement , removing the low contrast brought by too strong or too low X-ray .

然后，基于视网膜皮层理论可有效的估计出照射图像，将其应用于EPID图像增强中，去处X射线过强或过弱带来的对比度过低。

Methods The reconstruction process consisted of four steps : a. To acquire a portal image with an electronic portal imaging device ( EPID ) and convert it into an exit dose distribution on EPID plane ;

方法该模型计算体内剂量分布步骤如下：（a）使用电子射野影像系统获取射野影像，将射野影像转换为射出剂量；

When conducting quantitative analysis of patient positioning , we usually take EPID image and the simulator film or digitally reconstructed image ( DRR ) generated by TPS for registration to get setup errors [ 1 ] .

定量分析病人摆位时，一般是拿EPID图像与模拟定位片或TPS生成的数字重建影像（DRR）进行配准，得到摆位误差[1]。

In the first part , all experiments were performed on a Varian 600C / D accelerator ( 6MV x-ray ) equipped with a Varian Portal Vision ~ ( TM ) MK2 type EPID .

在剂量学特性研究中，所有实验均在装备有PortalVision~（TM）MK2型电子射野影像装置的Varian600C／D加速器上实现。

Objective To study the dose response characteristics and the influence factors such as gantry angle , field size and acquisition mode on the dosimetric response curves , when using a scanning liquid ion chamber electronic portal imaging device ( EPID ) for dose verification .

目的研究扫描液体电离室型电子射野影像装置（EPID）的剂量响应特性及其各种影响因素，如机架角、照射野大小、图像获取模式，以便进一步利用EPID进行剂量验证方面的研究。

Electrophoresis imaging display ( EPID ) , Gyricon ( rotate and image ) and liquid crystal display were introduced , as well as the development of other electronic-papers in such areas as color , high contrast , low power cost and fast response .

综述了电泳显示、旋转球显示和液晶显示及其他电子纸在彩色化、高反差、低能耗、快速响应等方面的研究进展，介绍了各种原理型显示技术的优缺点。