diff --git a/src/transmissionReconstruction/dataFilter/dataFilter.cpp b/src/transmissionReconstruction/dataFilter/dataFilter.cpp
index 3f973d8..0a5fd0d 100644
--- a/src/transmissionReconstruction/dataFilter/dataFilter.cpp
+++ b/src/transmissionReconstruction/dataFilter/dataFilter.cpp
@@ -39,6 +39,7 @@ namespace Recon {
     for (size_t i = 0; i < idx.getDataSize(); i++) {
         auto index = (size_t)(idx.getData()[i] - 1);
         auto sliceIndex = index / aMSensData0.getDataSize();
+        index = index % aMSensData0.getDataSize();
         transData.getData()[i] =
             (aMSensData[sliceIndex].getData()[index] >= sensFilter ? 1.0 : 0.0);
     }