fix metrics

petric.py

@@ -194,14 +194,14 @@ def get_data(srcdir=".", outdir=OUTDIR, sirf_verbosity=0):
 
     def get_image(fname):
         if (source := srcdir / 'PETRIC' / fname).is_file():
-            return STIR.ImageData(str(source))
+            return STIR.ImageData(str(source)).as_array()
         return None # explicit to suppress linter warnings
 
     reference_image = get_image('reference_image.hv')
     whole_object_mask = get_image('VOI_whole_object.hv')
     background_mask = get_image('VOI_background.hv')
     voi_masks = {
-        voi.stem: STIR.ImageData(str(voi))
+        voi.stem: STIR.ImageData(str(voi)).as_array()
         for voi in (srcdir / 'PETRIC').glob("VOI_*.hv") if voi.stem[4:] not in ('background', 'whole_object')}
 
     return Dataset(acquired_data, additive_term, mult_factors, OSEM_image, prior, kappa, reference_image,
@@ -238,7 +238,7 @@ def get_image(fname):
         if data.reference_image is not None:
             metrics_with_timeout.callbacks.append(
                 QualityMetrics(data.reference_image, data.whole_object_mask, data.background_mask,
-                               tb_summary_writer=metrics_with_timeout.tb, roi_mask_dict=data.voi_masks))
+                               tb_summary_writer=metrics_with_timeout.tb, voi_mask_dict=data.voi_masks))
         metrics_with_timeout.reset() # timeout from now
         algo = Submission(data)
         try: