Bosch W R, Low D A, Gerber R L, Michalski J M, Graham M V, Perez C A, Harms W B, Purdy J A
Radiation Oncology Center, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110.
Int J Radiat Oncol Biol Phys. 1995 Jan 1;31(1):135-42. doi: 10.1016/0360-3016(95)92197-8.
We have developed a software tool for interactively verifying treatment plan implementation. The Electronic View Box (EVB) tool copies the paradigm of current practice but does so electronically. A portal image (online portal image or digitized port film) is displayed side by side with a prescription image (digitized simulator film or digitally reconstructed radiograph). The user can measure distances between features in prescription and portal images and "write" on the display, either to approve the image or to indicate required corrective actions. The EVB tool also provides several features not available in conventional verification practice using a light box.
The EVB tool has been written in ANSI C using the X window system. The tool makes use of the Virtual Machine Platform and Foundation Library specifications of the NCI-sponsored Radiation Therapy Planning Tools Collaborative Working Group for portability into an arbitrary treatment planning system that conforms to these specifications. The present EVB tool is based on an earlier Verification Image Review tool, but with a substantial redesign of the user interface. A graphical user interface prototyping system was used in iteratively refining the tool layout to allow rapid modifications of the interface in response to user comments.
Features of the EVB tool include 1) hierarchical selection of digital portal images based on physician name, patient name, and field identifier; 2) side-by-side presentation of prescription and portal images at equal magnification and orientation, and with independent grayscale controls; 3) "trace" facility for outlining anatomical structures; 4) "ruler" facility for measuring distances; 5) zoomed display of corresponding regions in both images; 6) image contrast enhancement; and 7) communication of portal image evaluation results (approval, block modification, repeat image acquisition, etc.).
The EVB tool facilitates the rapid comparison of prescription and portal images and permits electronic communication of corrections in port shape and positioning.
我们开发了一种用于交互式验证治疗计划实施情况的软件工具。电子观片箱（EVB）工具效仿了当前的实践模式，但以电子方式实现。将门静脉图像（在线门静脉图像或数字化端口片）与处方图像（数字化模拟片或数字重建射线照片）并排显示。用户可以测量处方图像和门静脉图像中特征之间的距离，并在显示屏上“书写”，以批准图像或指明所需的纠正措施。EVB工具还提供了一些传统灯箱验证实践中所没有的功能。
EVB工具是使用X窗口系统用ANSI C编写的。该工具利用了由美国国家癌症研究所赞助的放射治疗计划工具协作工作组的虚拟机平台和基础库规范，以便能够移植到任何符合这些规范的治疗计划系统中。当前的EVB工具基于早期的验证图像审查工具，但对用户界面进行了大幅重新设计。使用了图形用户界面原型系统来迭代优化工具布局，以便根据用户反馈快速修改界面。
EVB工具的功能包括：1）基于医生姓名、患者姓名和射野标识符对数字门静脉图像进行分层选择；2）以相同的放大倍数和方向并排显示处方图像和门静脉图像，并具有独立的灰度控制；3）用于勾勒解剖结构的“跟踪”功能；4）用于测量距离的“标尺”功能；5）两幅图像中相应区域的缩放显示；6）图像对比度增强；7）门静脉图像评估结果（批准、挡块修改、重复图像采集等）的传达。
EVB工具便于快速比较处方图像和门静脉图像，并允许对端口形状和定位的校正进行电子通信。
