diff --git a/src/views/trials/trials-panel/reading/dicoms3D/components/ReadPage.vue b/src/views/trials/trials-panel/reading/dicoms3D/components/ReadPage.vue
index 4049b07f..d1a08168 100644
--- a/src/views/trials/trials-panel/reading/dicoms3D/components/ReadPage.vue
+++ b/src/views/trials/trials-panel/reading/dicoms3D/components/ReadPage.vue
@@ -1633,7 +1633,7 @@ export default {
             getTextLines: this.getEllipticalROIToolTextLines
           })
           toolGroup.addTool(FixedRadiusCircleROITool.toolName, {
-            radius: Number.isFinite(this.taskInfo.CircleRadius) ? this.taskInfo.CircleRadius : 1,
+            radius: Number.isFinite(this.taskInfo.CircleRadius) ? this.taskInfo.CircleRadius : 6,
             getTextLines: this.getCircleROIToolTextLines
           })
           toolGroup.addTool(AngleTool.toolName, {
diff --git a/src/views/trials/trials-panel/reading/dicoms3D/components/tools/FixedRadiusCircleROITool.js b/src/views/trials/trials-panel/reading/dicoms3D/components/tools/FixedRadiusCircleROITool.js
index 2aacc73d..3caa241e 100644
--- a/src/views/trials/trials-panel/reading/dicoms3D/components/tools/FixedRadiusCircleROITool.js
+++ b/src/views/trials/trials-panel/reading/dicoms3D/components/tools/FixedRadiusCircleROITool.js
@@ -29,7 +29,7 @@ class FixedRadiusCircleROITool extends cornerstoneTools.CircleROITool {
         storePointData: false,
         centerPointRadius: 0,
         calculateStats: true,
-        radius: 10, // Default radius in mm
+        radius: 6, // Default radius in mm
         radiusUnit: 'mm',
         statsCalculator: BasicStatsCalculator,
         getTextLines: defaultGetTextLines,