diff --git a/scanslicer/controller_detection.py b/scanslicer/controller_detection.py
index bc07fc4..9b858e3 100644
--- a/scanslicer/controller_detection.py
+++ b/scanslicer/controller_detection.py
@@ -11,3 +11,25 @@ class DetectionTaskSignals(QObject):
     status = Signal(str)
     finished = Signal(object, object, object)
     failed = Signal(str)
+
+
+# DetectionTask: class definition for ScanSlicer behavior.
+class DetectionTask(QRunnable):
+    # __init__: function definition for ScanSlicer behavior.
+    def __init__(self, autoslicer):
+        super().__init__()
+        self.autoslicer = autoslicer
+        self.signals = DetectionTaskSignals()
+
+    # run: function definition for ScanSlicer behavior.
+    def run(self):
+        try:
+            boxes, filter_preview_image = self.autoslicer.autodetect_slices(
+                self.signals.status.emit,
+                preview_filter_output=True,
+            )
+            normal_preview_image = cv2.cvtColor(self.autoslicer.image, cv2.COLOR_BGR2RGB)
+            self.signals.finished.emit(boxes, filter_preview_image, normal_preview_image)
+        except Exception as exc:
+            details = f"{exc}\n\n{traceback.format_exc()}"
+            self.signals.failed.emit(details)