diff --git a/mantidimaging/gui/windows/spectrum_viewer/model.py b/mantidimaging/gui/windows/spectrum_viewer/model.py
index 50b0ab4c085..0bd036df350 100644
--- a/mantidimaging/gui/windows/spectrum_viewer/model.py
+++ b/mantidimaging/gui/windows/spectrum_viewer/model.py
@@ -128,7 +128,11 @@ def set_stack(self, stack: ImageStack | None) -> None:
         self.tof_range = (0, stack.data.shape[0] - 1)
         self.tof_range_full = self.tof_range
         self.tof_data = self.get_stack_time_of_flight()
-        self.set_new_roi(ROI_ALL)
+        height, width = self.get_image_shape()
+        self._roi_ranges[ROI_ALL] = SensibleROI.from_list([0, 0, width, height])
+
+    def set_normalise_stack(self, normalise_stack: ImageStack | None) -> None:
+        self._normalise_stack = normalise_stack
 
     def set_new_roi(self, name: str) -> None:
         """
@@ -137,13 +141,7 @@ def set_new_roi(self, name: str) -> None:
         @param name: The name of the new ROI
         """
         height, width = self.get_image_shape()
-        self.set_roi(name, SensibleROI.from_list([0, 0, width, height]))
-
-    def set_normalise_stack(self, normalise_stack: ImageStack | None) -> None:
-        self._normalise_stack = normalise_stack
-
-    def set_roi(self, roi_name: str, roi: SensibleROI) -> None:
-        self._roi_ranges[roi_name] = roi
+        self._roi_ranges[name] = SensibleROI.from_list([0, 0, width, height])
 
     def get_averaged_image(self) -> np.ndarray | None:
         """
diff --git a/mantidimaging/gui/windows/spectrum_viewer/presenter.py b/mantidimaging/gui/windows/spectrum_viewer/presenter.py
index 891d6c65d08..0dbfcfdf2b9 100644
--- a/mantidimaging/gui/windows/spectrum_viewer/presenter.py
+++ b/mantidimaging/gui/windows/spectrum_viewer/presenter.py
@@ -202,7 +202,6 @@ def handle_roi_moved(self, force_new_spectrums: bool = False) -> None:
         """
         for name in self.view.spectrum_widget.roi_dict:
             current_roi = self.view.spectrum_widget.get_roi(name)
-            self.model.set_roi(name, current_roi)
             if force_new_spectrums:
                 spectrum = self.model.get_spectrum(
                     current_roi,
@@ -429,7 +428,6 @@ def change_selected_menu_option(self, opt: str) -> None:
 
     def do_adjust_roi(self) -> None:
         new_roi = self.convert_spinbox_roi_to_SensibleROI(self.view.roiPropertiesSpinBoxes)
-        self.model.set_roi(self.view.current_roi_name, new_roi)
         self.view.spectrum_widget.adjust_roi(new_roi, self.view.current_roi_name)
 
     def handle_storing_current_roi_name_on_tab_change(self) -> None:
diff --git a/mantidimaging/gui/windows/spectrum_viewer/test/model_test.py b/mantidimaging/gui/windows/spectrum_viewer/test/model_test.py
index 5597cff8b29..33533ec719d 100644
--- a/mantidimaging/gui/windows/spectrum_viewer/test/model_test.py
+++ b/mantidimaging/gui/windows/spectrum_viewer/test/model_test.py
@@ -228,7 +228,7 @@ def test_save_rits_roi_dat(self):
         norm = ImageStack(np.full([10, 11, 12], 2))
         stack.data[:, :, :5] *= 2
         self.model.set_new_roi("rits_roi")
-        self.model.set_roi("rits_roi", SensibleROI.from_list([0, 0, 10, 11]))
+        self.model._roi_ranges["rits_roi"] = SensibleROI.from_list([0, 0, 10, 11])
         self.model.set_normalise_stack(norm)
 
         self.model._roi_ranges["ROI_RITS"] = SensibleROI.from_list([0, 0, 10, 11])
@@ -475,7 +475,7 @@ def test_save_single_rits_spectrum(self, mock_save_rits_roi):
         norm = ImageStack(np.full([10, 11, 12], 2))
         stack.data[:, :, :5] *= 2
         self.model.set_new_roi("rits_roi")
-        self.model.set_roi("rits_roi", SensibleROI.from_list([0, 0, 5, 5]))
+        self.model._roi_ranges["rits_roi"] = SensibleROI.from_list([0, 0, 5, 5])
         self.model.set_normalise_stack(norm)
         self.model._roi_ranges["ROI_RITS"] = SensibleROI.from_list([0, 0, 5, 5])
 
@@ -490,7 +490,7 @@ def test_save_rits_correct_transmision(self, mock_save_rits_roi):
         for i in range(10):
             stack.data[:, :, i] *= i
         self.model.set_new_roi("rits_roi")
-        self.model.set_roi("rits_roi", SensibleROI.from_list([1, 0, 6, 4]))
+        self.model._roi_ranges["rits_roi"] = SensibleROI.from_list([1, 0, 6, 4])
         self.model.set_normalise_stack(norm)
         mock_path = mock.create_autospec(Path, instance=True)