diff --git a/include/aare/RawFile.hpp b/include/aare/RawFile.hpp
index 82106bc..0209733 100644
--- a/include/aare/RawFile.hpp
+++ b/include/aare/RawFile.hpp
@@ -72,6 +72,7 @@ class RawFile : public FileInterface {
     size_t bitdepth() const override;
     xy geometry();
     size_t n_modules() const;
+    size_t n_modules_in_roi() const;
 
     RawMasterFile master() const;
 
diff --git a/python/src/raw_file.hpp b/python/src/raw_file.hpp
index 8b8a5a6..83f1110 100644
--- a/python/src/raw_file.hpp
+++ b/python/src/raw_file.hpp
@@ -65,7 +65,7 @@ void define_raw_file_io_bindings(py::module &m) {
                     header = py::array_t<DetectorHeader>(n_frames);
                 } else {
                     header = py::array_t<DetectorHeader>(
-                        {self.n_modules(), n_frames});
+                        {self.n_modules_in_roi(), n_frames});
                 }
                 // py::array_t<DetectorHeader> header({self.n_mod(), n_frames});
 
@@ -103,5 +103,6 @@ void define_raw_file_io_bindings(py::module &m) {
         .def_property_readonly("geometry", &RawFile::geometry)
         .def_property_readonly("detector_type", &RawFile::detector_type)
         .def_property_readonly("master", &RawFile::master)
-        .def_property_readonly("n_modules", &RawFile::n_modules);
+        .def_property_readonly("n_modules", &RawFile::n_modules)
+        .def_property_readonly("n_modules_in_roi", &RawFile::n_modules_in_roi);
 }
\ No newline at end of file
diff --git a/python/tests/test_RawFile.py b/python/tests/test_RawFile.py
new file mode 100644
index 0000000..769b4e6
--- /dev/null
+++ b/python/tests/test_RawFile.py
@@ -0,0 +1,14 @@
+import pytest
+from aare import RawFile
+
+@pytest.mark.files
+def test_read_rawfile_with_roi(test_data_path):
+
+    # Starting with f1 there is now 7 frames left in the series of files
+    print(test_data_path)
+    with RawFile(test_data_path / "raw/SingleChipROI/Data_master_0.json") as f:
+        headers, frames = f.read()
+
+    assert headers.size == 10100
+    assert frames.shape == (10100, 256, 256)
+    
\ No newline at end of file
diff --git a/src/RawFile.cpp b/src/RawFile.cpp
index 788d012..f03ec89 100644
--- a/src/RawFile.cpp
+++ b/src/RawFile.cpp
@@ -62,7 +62,7 @@ void RawFile::read_into(std::byte *image_buf, size_t n_frames,
         this->get_frame_into(m_current_frame++, image_buf, header);
         image_buf += bytes_per_frame();
         if (header)
-            header += m_geometry.n_modules();
+            header += m_geometry.n_modules_in_roi();
     }
 }
 
@@ -98,6 +98,9 @@ size_t RawFile::bitdepth() const { return m_master.bitdepth(); }
 xy RawFile::geometry() { return m_master.geometry(); }
 
 size_t RawFile::n_modules() const { return m_geometry.n_modules(); };
+size_t RawFile::n_modules_in_roi() const {
+    return m_geometry.n_modules_in_roi();
+};
 
 void RawFile::open_subfiles() {
     if (m_mode == "r")
diff --git a/src/RawFile.test.cpp b/src/RawFile.test.cpp
index 978d011..7eb3707 100644
--- a/src/RawFile.test.cpp
+++ b/src/RawFile.test.cpp
@@ -257,12 +257,21 @@ TEST_CASE_PRIVATE(aare, open_multi_module_file_with_roi,
 
     RawFile f(fpath, "r");
 
-    REQUIRE(f.master().roi().value().width() == 256);
-    REQUIRE(f.master().roi().value().height() == 256);
+    SECTION("read 2 frames") {
+        REQUIRE(f.master().roi().value().width() == 256);
+        REQUIRE(f.master().roi().value().height() == 256);
 
-    CHECK(f.m_geometry.n_modules() == 2);
+        CHECK(f.m_geometry.n_modules() == 2);
 
-    CHECK(f.m_geometry.n_modules_in_roi() == 1);
+        CHECK(f.m_geometry.n_modules_in_roi() == 1);
+
+        auto frames = f.read_n(2);
+
+        CHECK(frames.size() == 2);
+
+        CHECK(frames[0].rows() == 256);
+        CHECK(frames[1].cols() == 256);
+    }
 }
 } // close namespace aare