diff --git a/DWIConvert/TestSuite/CMakeLists.txt b/DWIConvert/TestSuite/CMakeLists.txt
index 5d87dcf0cb..e359fe7ae8 100644
--- a/DWIConvert/TestSuite/CMakeLists.txt
+++ b/DWIConvert/TestSuite/CMakeLists.txt
@@ -7,7 +7,7 @@ set(DWITarDir ${TestData_DIR}/DWI_TestData_TARBALLS)
 # 1 upload testcase file into BRAINSTools/Public/ in http://slicer.kitware.com;
 # 2 download the key file(MD5);
 # 3 put the MD5 file into /Volumes/scratch/hxie1/Projects/BRAINSTools/TestData/DWI_TestData_TARBALLS;
-# 4 Ctest will automatically find it and download it
+# 4 rerun CCMake, then Ctest will automatically find it and download it
 
 set(ALL_DICOM_TARBALLS
 ${DWITarDir}/DWIConvertGeSignaHdxBMatrixTest.tar.gz
@@ -51,7 +51,7 @@ ${DWITarDir}/SiemensTrioTimBigEndian1.tar.gz
 ${DWITarDir}/SiemensVerio.tar.gz
 ${DWITarDir}/DWIConvertMultiShellFSITestSmallSize.tar.gz
 ${DWITarDir}/SpaceThicknessDiffDicom.tar.gz
-#${DWITarDir}/DWIConvertMultiShellFSITest.tar.gz
+#${DWITarDir}/DWIConvertMultiShellFSITest.tar.gz (for 640M big file)
 )
 
 # accumulator for test names that actually force
@@ -102,7 +102,7 @@ foreach(CLP DWICompare DWISimpleCompare)
 endforeach()
 
 ## Tool for comparing if BVec and BVal files are the same.
-add_executable(BFileCompareTool BFileCompareTool.cpp chop.cpp)
+add_executable(BFileCompareTool BFileCompareTool.cpp)
 target_link_libraries(BFileCompareTool DWIConvertSupportLib BRAINSCommonLib )
 
 #
@@ -136,10 +136,6 @@ set(TstOutput ${CMAKE_CURRENT_BINARY_DIR})
 
 set(DWIBASELINE_DIR ${TestData_DIR}/DWI_TestData_OUTPUTS)
 
-## DUMMYPROG
-add_executable(chop chop.cpp)
-target_link_libraries(chop BRAINSCommonLib)
-
 #
 # pretty useless test except for slight increase in coverage
 # and verify the programs got built
@@ -439,7 +435,7 @@ ExternalData_Add_Test( ${PROJECT_NAME}FetchData NAME DWIConvertSiemensTrio_Syngo
   )
 AddDataDependency(DWIConvertSiemensTrio_Syngo2004A_2Test)
 
-# add a ctest case supporting multi-shell FSL data by Hui Xie on Jan 28th, 2017
+# multi-shell FSL data for 640M bif file
 # the blank space between "ExternalData_Add_Test( " and "${PROJECT_NAME}FetchData  NAME" below is critical.
 #[[ExternalData_Add_Test( ${PROJECT_NAME}FetchData  NAME  DWIConvertMultiShellFSITest
         COMMAND ${CMAKE_COMMAND}
@@ -468,6 +464,7 @@ ExternalData_Add_Test( ${PROJECT_NAME}FetchData  NAME  SpaceThicknessDiffDicom
 AddDataDependency(SpaceThicknessDiffDicom)
 
 
+# multishell data test for small size file
 ExternalData_Add_Test( ${PROJECT_NAME}FetchData  NAME  DWIConvertMultiShellFSITestSmallSize
         COMMAND ${CMAKE_COMMAND}
         -D TEST_PROGRAM=$<TARGET_FILE:DWIConvert>
diff --git a/DWIConvert/TestSuite/chop.cpp b/DWIConvert/TestSuite/chop.cpp
deleted file mode 100644
index 92a330fde9..0000000000
--- a/DWIConvert/TestSuite/chop.cpp
+++ /dev/null
@@ -1,37 +0,0 @@
-//
-// Created by Hans Johnson on 3/7/17.
-//
-
-#include <itkImageFileReader.h>
-#include <itkImageFileWriter.h>
-
-#include <itkExtractImageFilter.h>
-
-int main() {
-  typedef itk::Image<unsigned char,4> IMType;
-
-  typedef itk::ImageFileReader<IMType> IFR;
-  typedef itk::ImageFileWriter<IMType> IFW;
-
-  IFR::Pointer ifr= IFR::New();
-  ifr->SetFileName("/scratch/hxie1/Research/DWIConvertRefactor/RyanEckbo/dwi98.nii.gz");
-  ifr->Update();
-
-  IMType::Pointer img = ifr->GetOutput();
-
-  itk::ExtractImageFilter<IMType,IMType>::Pointer eif=itk::ExtractImageFilter<IMType,IMType>::New();
-
-  eif->SetInput(img);
-
-  IMType::RegionType region= img->GetLargestPossibleRegion();
-  IMType::RegionType::SizeType size= region.GetSize();
-  size[3]=10;
-  region.SetSize(size);
-  eif->SetExtractionRegion(region);
-  eif->Update();
-
-  IFW::Pointer ifw = IFW::New();
-  ifw->SetFileName("/scratch/hxie1/Research/DWIConvertRefactor/RyanEckbo/dwi10.nii.gz");
-  ifw->SetInput(eif->GetOutput());
-  ifw->Update();
-}