Merge pull request #457 from chrisfilo/enh/testpixdim4

check if pixdim4 is defined

Author: chrisgorgo

utils/issues/list.js

@@ -371,5 +371,10 @@ module.exports = {
         key: 'DUPLICATE_NIFTI_FILES',
         severity: 'error',
         reason:   "Nifti file exist with both '.nii' and '.nii.gz' extensions."
+    },
+    75: {
+        key: 'NIFTI_PIXDIM4',
+        severity: 'error',
+        reason: "Nifti file's header is missing time dimension information."
     }
 };

validators/nii.js

@@ -159,7 +159,13 @@ module.exports = function NIFTI (header, file, jsonContentsDict, bContentsDict,
                 }));
             }
 
-            if (mergedDictionary.RepetitionTime && header) {
+            if (typeof repetitionTime === 'undefined' && header) {
+                issues.push(new Issue({
+                    file: file,
+                    code: 75
+                }));
+            }
+            else if (mergedDictionary.RepetitionTime && header) {
                 if (repetitionUnit !== 's') {
                     issues.push(new Issue({
                         file: file,