LEADTOOLS HTML5 SDK使用教程：DICOM图像注释

利用HTML5和JavaScript构建一个完整的DICOM Viewer涉及到许多的重要功能。LEADTOOLS医疗图像开发包提供了创建零足迹DICOM Viewer所需的所有功能：图像显示、图像处理、客户端医学影像“调窗”、Series Stack和注释等。接下来，我们将深入介绍HTML5 DICOM Viewer、PACS查询/检索以及医学影像“调窗”等功能

LEADTOOLS HTML5 DICOM Viewer功能介绍：1、HTML5/JavaScript查看器控件2、鼠标和多点触控手势输入3、包含快速客户端医学影像“调窗”工具、Series Stack、图像处理等功能4、从您本地的归档或一个远程的PACS使用DICOM通信，在您的桌面、平板电脑或移动设备上查看DICOM图像的任何地方。5、本地HTML5图像注解和标记。

DICOM图像HTML5注释一旦选中DICOM系列，图像开始链接到查看器，并且注解实现初始化。完成AnnAutomationManager对象的创建并连接到查看器。function initializeAnnotations() {_automationManager = new Leadtools.Annotations.Automation.AnnAutomationManager(); _automationManager.createDefaultObjects(); _automationManager.findObjectById(Leadtools.Annotations.Core.AnnObject.rulerObjectId).get_objectTemplate().set_measurementUnit(6);_automationManager.findObjectById(Leadtools.Annotations.Core.AnnObject.polyRulerObjectId).get_objectTemplate().set_measurementUnit(6);_automationManager.findObjectById(Leadtools.Annotations.Core.AnnObject.protractorObjectId).get_objectTemplate().set_measurementUnit(6); var divElemnt = document.getElementById('ViewerParent');_overlayCanvas = document.createElement('canvas'); _overlayCanvas.id = 'overlayCanvas'; _overlayCanvas.width = $(divElemnt).width();_overlayCanvas.height = $(divElemnt).height(); var parent = document.getElementById(_leadViewer.get_canvasId()).parentNode; parent.appendChild(_overlayCanvas); _automationInteractiveMode = new Leadtools.Annotations.Automation.ImageViewerAutomationControl(_leadViewer);}

使用注释前，你需要选择所需要绘制的对象，或者使用Select工具修改现有注释。function OnAnnotationSelect() {if (null != _leadViewer && null != _currentAutomation && _annotationSelect.enabled) {AutomationService();_currentAutomation.get_manager().set_currentObjectId(Leadtools.Annotations.Core.AnnObject.selectObjectId);}}function OnAnnotationArrow() {if (null != _leadViewer && null != _currentAutomation && _annotationArrow.enabled) {AutomationService();_currentAutomation.get_manager().set_currentObjectId(Leadtools.Annotations.Core.AnnObject.pointerObjectId);}} function OnAnnotationText() {if (null != _leadViewer && null != _currentAutomation && _annotationText.enabled) {AutomationService();_currentAutomation.get_manager().set_currentObjectId(Leadtools.Annotations.Core.AnnObject.textObjectId);}}

利用Web服务加载和保存注释加载和保存注释功能对医疗应用程序的工作流程是非常重要的。首先，它们用于说明和指出图像中注意的事项。当然，最重要的仍然是图像本身，所以最好能够隐藏和显示注释。function DoSaveAnn(annotationsData) {var firstFrame = _dicomLoader.GetFrame(0);var description = $('#annSaveDescText').val(); if (!description) {alert('You must enter a description');return;} var series = firstFrame.Instance.SeriesInstanceUID;var userData = { Description: description,ReferencedSOPInstance: firstFrame.Instance.SOPInstanceUID}; annotationsProxy.SaveAnnotations(series, annotationsData, JSON.stringify(userData), SaveAnnotationsError, SaveAnnotationsSuccess);}

当图像帧被加载完后，应用程序会进行快速的权限检查，然后检索与图像关联的先前保存的注释文件数组。function OnSeriesLoaded(args, frames) {_overlayManager.SetOverlayTags(frames); if (_userPermissions.CanViewAnnotations) {annotationsProxy.FindSeriesAnnotations(frames[0].Instance.SeriesInstanceUID,FindAnnotationsError, FindAnnotationsSuccess);}} function FindAnnotationsSuccess(annotations) {if (annotations && annotations.length > 0) {_loadedAnnotationsIds = annotations;EnableAnnotationLoad();}else {_loadedAnnotationsIds = null; DisableAnnotationLoad();}}

如果图像有注释，则加载按钮被启用。单击“加载”按钮会弹出一个与图像关联的注释对话框。用户选择一个注释文件后，下列代码可以从服务器获取注释数据，然后将注释添加至canvas。

下图为iPhone设备上的图像和注释效果：function LoadSelectedServerAnn() {var annID = _loadedAnnotationsIds[parseInt($($('.annItemSelected')[0]).attr('annIndex'))]; annotationsProxy.GetAnnotations(annID.AnnotationID, GetAnnotationsError, GetAnnotationsSuccess);} function GetAnnotationsSuccess(annotationsData) {if (annotationsData) {try {var length = _automationArray.length;var codecs = new Leadtools.Annotations.Core.AnnCodecs(); while (length--) {var frame = _dicomLoader.GetFrame(length);var automation = _automationArray[length];var container = automation.get_container();var destChildren = container.get_children();var instanceNumber = frame.Instance.InstanceNumber; var loadContainer = codecs.loadFromXmlDocument(annotationsData, parseInt (instanceNumber)); if (loadContainer) {var srcChildren = loadContainer.get_children();var childrenCount = srcChildren.get_count(); for (var i = 0; i < childrenCount; i++) {var child = srcChildren.get_item(i);destChildren.add(child);} automation.get_automationControl().automationInvalidate();}} alert('Annotations Loaded');}catch (er) {alert('Invalid annotations data.\n\r' + er );}}else {alert('No annotations found');}}