阅片工具在DICOM文件中不具备pixelspacing时，不能测量。

src/views/trials/trials-panel/reading/dicoms/components/DicomCanvas.vue

@@ -137,7 +137,7 @@ import Contextmenu from 'vue-contextmenujs'
 Vue.use(Contextmenu)
 import * as cornerstone from 'cornerstone-core'
 import metaDataProvider from '@/utils/metaDataProvider'
-cornerstone.metaData.addProvider(metaDataProvider, { priority: 10 });
+
 import * as cornerstoneMath from 'cornerstone-math'
 import * as cornerstoneTools from 'cornerstone-tools'
 const scroll = cornerstoneTools.import('util/scrollToIndex')
@@ -1134,6 +1134,7 @@ export default {
         //   resolve()
         // })
         this.loading = true
+        cornerstone.metaData.addProvider(metaDataProvider, 1);
         cornerstone.loadAndCacheImage(this.stack.imageIds[this.stack.currentImageIdIndex])
           .then(async image => {
             if (this.stack.imageIds.indexOf(image.imageId) !== -1) {

src/views/trials/trials-panel/reading/dicoms/customize/CustomizeDicomCanvas.vue

@@ -137,7 +137,7 @@ import Contextmenu from 'vue-contextmenujs'
 Vue.use(Contextmenu)
 import * as cornerstone from 'cornerstone-core'
 import metaDataProvider from '@/utils/metaDataProvider'
-cornerstone.metaData.addProvider(metaDataProvider, { priority: 10 });
+
 import * as cornerstoneMath from 'cornerstone-math'
 import * as cornerstoneTools from 'cornerstone-tools'
 const scroll = cornerstoneTools.import('util/scrollToIndex')
@@ -1088,6 +1088,7 @@ export default {
         //   resolve()
         // })
         this.loading = true
+        cornerstone.metaData.addProvider(metaDataProvider, 1);
         cornerstone.loadAndCacheImage(this.stack.imageIds[this.stack.currentImageIdIndex])
           .then(async image => {
             if (this.stack.imageIds.indexOf(image.imageId) !== -1) {
@@ -1285,7 +1286,6 @@ export default {
         'imagePlaneModule',
         enabledElement.image.imageId
       )
-
       if (!imagePlane || !imagePlane.rowCosines || !imagePlane.columnCosines) {
         return
       }