diff --git a/nd2reader/model/__init__.py b/nd2reader/model/__init__.py
index 883972b..4d59b4d 100644
--- a/nd2reader/model/__init__.py
+++ b/nd2reader/model/__init__.py
@@ -68,4 +68,4 @@ class Image(object):
 
     @property
     def is_valid(self):
-        return np.any(self.data)
\ No newline at end of file
+        return np.any(self._raw_data)
\ No newline at end of file