diff --git a/atlas/tasks.py b/atlas/tasks.py
index afe62320..18f43b90 100644
--- a/atlas/tasks.py
+++ b/atlas/tasks.py
@@ -199,19 +199,8 @@ def series_reconstruct_task(
     native_col_spacing = geom["col_spacing"]
     native_z_spacing = geom["native_z_spacing"]
 
-    target_spacing = float(slice_spacing_val) if slice_spacing_val is not None else native_z_spacing
-    slab_thickness = float(slice_thickness_val) if slice_thickness_val is not None else target_spacing
-
-    volume_for_recon, recon_centers_mm = atlas_views._aggregate_volume_along_z(
-        volume,
-        source_positions_mm,
-        float(target_spacing),
-        float(slab_thickness),
-        recon_thickness_mode,
-    )
-
-    if volume_for_recon.shape[0] < 1:
-        raise ValueError("No reconstruction slices were generated")
+    requested_slice_spacing = float(slice_spacing_val) if slice_spacing_val is not None else None
+    requested_slab_thickness = float(slice_thickness_val) if slice_thickness_val is not None else None
 
     # Determine source acquisition plane from normal vector.
     dominant_normal_axis = int(np.argmax(np.abs(normal_dir)))
@@ -219,9 +208,14 @@ def series_reconstruct_task(
 
     # Reorient the reconstructed volume into patient axes order [z, y, x] so
     # generated plane names are anatomically correct regardless of source plane.
-    source_axis_dirs = [normal_dir, row_dir, col_dir]
-    source_axis_spacings = [float(target_spacing), float(native_row_spacing), float(native_col_spacing)]
-    source_axis_sizes = [int(volume_for_recon.shape[0]), int(volume_for_recon.shape[1]), int(volume_for_recon.shape[2])]
+    # NOTE: DICOM stores ImageOrientationPatient as:
+    # - first triplet: direction across columns (x-axis in pixel grid)
+    # - second triplet: direction across rows (y-axis in pixel grid)
+    # In _extract_recon_geometry names are historically row_dir/col_dir, so we
+    # map axis spacing/indexing explicitly to avoid directional mixups.
+    source_axis_dirs = [normal_dir, col_dir, row_dir]
+    source_axis_spacings = [float(native_z_spacing), float(native_row_spacing), float(native_col_spacing)]
+    source_axis_sizes = [int(volume.shape[0]), int(volume.shape[1]), int(volume.shape[2])]
 
     source_for_patient_axis = {}
     sign_for_patient_axis = {}
@@ -243,7 +237,7 @@ def series_reconstruct_task(
     spacing_y = source_axis_spacings[src_y]
     spacing_z = source_axis_spacings[src_z]
 
-    vol_zyx = np.transpose(volume_for_recon, (src_z, src_y, src_x))
+    vol_zyx = np.transpose(volume, (src_z, src_y, src_x))
 
     if sign_for_patient_axis[2] < 0:
         vol_zyx = np.flip(vol_zyx, axis=0)
@@ -255,9 +249,9 @@ def series_reconstruct_task(
     def source_indices_from_patient_zyx(iz, iy, ix):
         src_indices = [0, 0, 0]
 
-        z_index = int(iz)
-        y_index = int(iy)
-        x_index = int(ix)
+        z_index = float(iz)
+        y_index = float(iy)
+        x_index = float(ix)
 
         if sign_for_patient_axis[2] < 0:
             z_index = source_axis_sizes[src_z] - 1 - z_index
@@ -275,41 +269,106 @@ def series_reconstruct_task(
         src_k, src_r, src_c = source_indices_from_patient_zyx(iz, iy, ix)
         pos = (
             np.asarray(origin_ipp, dtype=float)
-            + (np.asarray(normal_dir, dtype=float) * (float(src_k) * float(target_spacing)))
-            + (np.asarray(row_dir, dtype=float) * (float(src_r) * float(native_row_spacing)))
-            + (np.asarray(col_dir, dtype=float) * (float(src_c) * float(native_col_spacing)))
+            + (np.asarray(normal_dir, dtype=float) * (float(src_k) * float(native_z_spacing)))
+            + (np.asarray(col_dir, dtype=float) * (float(src_r) * float(native_row_spacing)))
+            + (np.asarray(row_dir, dtype=float) * (float(src_c) * float(native_col_spacing)))
         )
         return [float(pos[0]), float(pos[1]), float(pos[2])]
 
+    spacing_x = source_axis_spacings[src_x]
+    spacing_y = source_axis_spacings[src_y]
+    spacing_z = source_axis_spacings[src_z]
+
+    def _reduce_slab(slab):
+        if recon_thickness_mode == "max":
+            out = np.max(slab, axis=0)
+        elif recon_thickness_mode == "min":
+            out = np.min(slab, axis=0)
+        else:
+            out = np.mean(slab, axis=0)
+
+        if np.issubdtype(volume.dtype, np.integer):
+            info = np.iinfo(volume.dtype)
+            out = np.clip(np.rint(out), info.min, info.max).astype(volume.dtype)
+        else:
+            out = out.astype(volume.dtype, copy=False)
+        return out
+
+    def _slice_indices_for_axis(axis_length, axis_spacing, output_spacing, slab_thickness):
+        if output_spacing <= 0:
+            raise ValueError("Slice spacing must be greater than 0")
+        if slab_thickness <= 0:
+            raise ValueError("Slice thickness must be greater than 0")
+
+        axis_positions_mm = np.arange(axis_length, dtype=float) * float(axis_spacing)
+        end_pos = axis_positions_mm[-1] if axis_positions_mm.size else 0.0
+        centers_mm = np.arange(0.0, end_pos + (output_spacing * 0.5), output_spacing, dtype=float)
+        if centers_mm.size == 0:
+            centers_mm = np.array([0.0], dtype=float)
+
+        half = slab_thickness / 2.0
+        slabs = []
+        centers_idx = []
+        for center_mm in centers_mm:
+            mask = np.abs(axis_positions_mm - center_mm) <= (half + 1e-6)
+            if not mask.any():
+                nearest = int(np.argmin(np.abs(axis_positions_mm - center_mm)))
+                idxs = np.array([nearest], dtype=int)
+            else:
+                idxs = np.where(mask)[0].astype(int)
+
+            slabs.append(idxs)
+            centers_idx.append(float(center_mm / axis_spacing) if axis_spacing > 0 else float(idxs[0]))
+
+        return slabs, centers_idx
+
     plane_builders = {}
     for plane in recon_planes:
         plane_norm = plane.lower()
         if plane_norm == "axial":
+            plane_spacing = float(requested_slice_spacing) if requested_slice_spacing is not None else float(spacing_z)
+            plane_thickness = float(requested_slab_thickness) if requested_slab_thickness is not None else float(plane_spacing)
+            slab_indices, slab_centers_idx = _slice_indices_for_axis(
+                int(vol_zyx.shape[0]), float(spacing_z), plane_spacing, plane_thickness
+            )
             plane_builders[plane_norm] = {
-                "count": int(vol_zyx.shape[0]),
-                "slice_fn": lambda idx: vol_zyx[idx, :, :],
+                "count": int(len(slab_indices)),
+                "slice_fn": lambda idx, slabs=slab_indices: _reduce_slab(vol_zyx[slabs[idx], :, :]),
                 "pixel_spacing_out": [float(spacing_y), float(spacing_x)],
-                "spacing_between_slices_out": float(spacing_z),
-                "image_orientation_out": [0.0, 1.0, 0.0, 1.0, 0.0, 0.0],
-                "position_fn": lambda idx: position_from_patient_zyx(idx, 0, 0),
+                "spacing_between_slices_out": float(plane_spacing),
+                "slice_thickness_out": float(plane_thickness),
+                "image_orientation_out": [1.0, 0.0, 0.0, 0.0, 1.0, 0.0],
+                "position_fn": lambda idx, centers=slab_centers_idx: position_from_patient_zyx(centers[idx], 0.0, 0.0),
             }
         elif plane_norm == "coronal":
+            plane_spacing = float(requested_slice_spacing) if requested_slice_spacing is not None else float(spacing_y)
+            plane_thickness = float(requested_slab_thickness) if requested_slab_thickness is not None else float(plane_spacing)
+            slab_indices, slab_centers_idx = _slice_indices_for_axis(
+                int(vol_zyx.shape[1]), float(spacing_y), plane_spacing, plane_thickness
+            )
             plane_builders[plane_norm] = {
-                "count": int(vol_zyx.shape[1]),
-                "slice_fn": lambda idx: vol_zyx[:, idx, :],
+                "count": int(len(slab_indices)),
+                "slice_fn": lambda idx, slabs=slab_indices: _reduce_slab(vol_zyx[:, slabs[idx], :]),
                 "pixel_spacing_out": [float(spacing_z), float(spacing_x)],
-                "spacing_between_slices_out": float(spacing_y),
-                "image_orientation_out": [0.0, 0.0, 1.0, 1.0, 0.0, 0.0],
-                "position_fn": lambda idx: position_from_patient_zyx(0, idx, 0),
+                "spacing_between_slices_out": float(plane_spacing),
+                "slice_thickness_out": float(plane_thickness),
+                "image_orientation_out": [1.0, 0.0, 0.0, 0.0, 0.0, 1.0],
+                "position_fn": lambda idx, centers=slab_centers_idx: position_from_patient_zyx(0.0, centers[idx], 0.0),
             }
         elif plane_norm == "sagittal":
+            plane_spacing = float(requested_slice_spacing) if requested_slice_spacing is not None else float(spacing_x)
+            plane_thickness = float(requested_slab_thickness) if requested_slab_thickness is not None else float(plane_spacing)
+            slab_indices, slab_centers_idx = _slice_indices_for_axis(
+                int(vol_zyx.shape[2]), float(spacing_x), plane_spacing, plane_thickness
+            )
             plane_builders[plane_norm] = {
-                "count": int(vol_zyx.shape[2]),
-                "slice_fn": lambda idx: vol_zyx[:, :, idx],
+                "count": int(len(slab_indices)),
+                "slice_fn": lambda idx, slabs=slab_indices: _reduce_slab(vol_zyx[:, :, slabs[idx]]),
                 "pixel_spacing_out": [float(spacing_z), float(spacing_y)],
-                "spacing_between_slices_out": float(spacing_x),
-                "image_orientation_out": [0.0, 0.0, 1.0, 0.0, 1.0, 0.0],
-                "position_fn": lambda idx: position_from_patient_zyx(0, 0, idx),
+                "spacing_between_slices_out": float(plane_spacing),
+                "slice_thickness_out": float(plane_thickness),
+                "image_orientation_out": [0.0, 1.0, 0.0, 0.0, 0.0, 1.0],
+                "position_fn": lambda idx, centers=slab_centers_idx: position_from_patient_zyx(0.0, 0.0, centers[idx]),
             }
 
     if not plane_builders:
@@ -344,7 +403,7 @@ def series_reconstruct_task(
             ds_new.PixelSpacing = [float(cfg["pixel_spacing_out"][0]), float(cfg["pixel_spacing_out"][1])]
             ds_new.ImageOrientationPatient = cfg["image_orientation_out"]
             ds_new.ImagePositionPatient = cfg["position_fn"](idx)
-            ds_new.SliceThickness = float(slab_thickness)
+            ds_new.SliceThickness = float(cfg["slice_thickness_out"])
             ds_new.SpacingBetweenSlices = float(cfg["spacing_between_slices_out"])
 
             out_io = io.BytesIO()
@@ -401,8 +460,8 @@ def series_reconstruct_task(
     return {
         "series_id": series.pk,
         "created_series": created_series,
-        "target_spacing": float(target_spacing),
-        "slab_thickness": float(slab_thickness),
+        "target_spacing": float(requested_slice_spacing) if requested_slice_spacing is not None else None,
+        "slab_thickness": float(requested_slab_thickness) if requested_slab_thickness is not None else None,
         "mode": recon_thickness_mode,
         "source_plane": source_plane,
     }
\ No newline at end of file
diff --git a/atlas/templates/atlas/task_overview.html b/atlas/templates/atlas/task_overview.html
index 5cb97242..48162281 100644
--- a/atlas/templates/atlas/task_overview.html
+++ b/atlas/templates/atlas/task_overview.html
@@ -51,10 +51,28 @@ Atlas Task Overview
         </div>
     </div>
 
-    <div class="table-responsive">
-        <table class="table table-sm table-striped align-middle">
+    <form method="post" class="mb-3">
+        {% csrf_token %}
+        <div class="d-flex flex-wrap align-items-center gap-2 mb-2">
+            <select class="form-select form-select-sm" name="task_action" style="max-width: 320px;">
+                <option value="">Choose task action...</option>
+                <option value="reset_failed">Reset FAILED to READY</option>
+                <option value="reset_selected">Reset selected to READY (skip RUNNING)</option>
+                <option value="delete_completed">Delete selected COMPLETED</option>
+                <option value="delete_failed">Delete selected FAILED</option>
+            </select>
+            <button type="submit" class="btn btn-sm btn-primary">Apply to selected</button>
+            <div class="form-check ms-2">
+                <input class="form-check-input" type="checkbox" id="select-all-tasks">
+                <label class="form-check-label small" for="select-all-tasks">Select all</label>
+            </div>
+        </div>
+
+        <div class="table-responsive">
+            <table class="table table-sm table-striped align-middle">
             <thead>
                 <tr>
+                    <th style="width: 36px;"></th>
                     <th>Task</th>
                     <th>Status</th>
                     <th>Generated Series</th>
@@ -64,11 +82,15 @@ Atlas Task Overview
                     <th>Finished</th>
                     <th>Worker</th>
                     <th>Error</th>
+                    <th>Actions</th>
                 </tr>
             </thead>
             <tbody>
                 {% for task in tasks %}
                     <tr>
+                        <td>
+                            <input class="form-check-input task-select" type="checkbox" name="task_ids" value="{{ task.id }}">
+                        </td>
                         <td>
                             <div class="small fw-semibold">{{ task.task_path }}</div>
                             <div class="small text-muted">{{ task.id }}</div>
@@ -99,14 +121,58 @@ Atlas Task Overview
                         <td class="small">{{ task.finished_at|date:"Y-m-d H:i:s" }}</td>
                         <td class="small">{{ task.worker_ids }}</td>
                         <td class="small text-danger">{{ task.exception_class_path|default:"" }}</td>
+                        <td class="small">
+                            {% if task.traceback %}
+                                <button
+                                    class="btn btn-outline-danger btn-sm"
+                                    type="button"
+                                    data-bs-toggle="collapse"
+                                    data-bs-target="#traceback-{{ task.id }}"
+                                    aria-expanded="false"
+                                    aria-controls="traceback-{{ task.id }}"
+                                >
+                                    View full traceback
+                                </button>
+                            {% else %}
+                                <span class="text-muted">-</span>
+                            {% endif %}
+                        </td>
                     </tr>
+                    {% if task.traceback %}
+                        <tr class="collapse" id="traceback-{{ task.id }}">
+                            <td></td>
+                            <td colspan="10">
+                                <div class="border rounded bg-dark-subtle p-2">
+                                    <div class="small fw-semibold mb-1">Full traceback</div>
+                                    <pre class="small mb-0" style="white-space: pre-wrap;">{{ task.traceback }}</pre>
+                                </div>
+                            </td>
+                        </tr>
+                    {% endif %}
                 {% empty %}
                     <tr>
-                        <td colspan="9" class="text-muted">No tasks found for this filter.</td>
+                        <td colspan="11" class="text-muted">No tasks found for this filter.</td>
                     </tr>
                 {% endfor %}
             </tbody>
-        </table>
-    </div>
+            </table>
+        </div>
+    </form>
+
+    <script>
+        (function () {
+            const selectAll = document.getElementById('select-all-tasks');
+            const rows = Array.from(document.querySelectorAll('.task-select'));
+            if (!selectAll || !rows.length) {
+                return;
+            }
+
+            selectAll.addEventListener('change', function () {
+                rows.forEach((cb) => {
+                    cb.checked = selectAll.checked;
+                });
+            });
+        })();
+    </script>
 </div>
 {% endblock content %}
diff --git a/atlas/views.py b/atlas/views.py
index a342d3f8..63833bd7 100755
--- a/atlas/views.py
+++ b/atlas/views.py
@@ -819,6 +819,54 @@ def task_overview(request):
             },
         )
 
+    if request.method == "POST":
+        action = (request.POST.get("task_action") or "").strip()
+        selected_ids = [task_id for task_id in request.POST.getlist("task_ids") if task_id]
+
+        if not selected_ids:
+            messages.warning(request, "Select at least one task to run an action.")
+            return redirect(f"{reverse('atlas:task_overview')}?status={(request.GET.get('status') or 'all').strip().lower()}")
+
+        selected_qs = DBTaskResult.objects.filter(id__in=selected_ids)
+
+        if action == "reset_failed":
+            updated = selected_qs.filter(status="FAILED").update(
+                status="READY",
+                started_at=None,
+                finished_at=None,
+                worker_ids="",
+                exception_class_path="",
+                traceback="",
+                return_value=None,
+            )
+            messages.success(request, f"Reset {updated} failed task(s) to READY.")
+        elif action == "reset_selected":
+            blocked = selected_qs.filter(status="RUNNING").count()
+            updated = selected_qs.exclude(status="RUNNING").update(
+                status="READY",
+                started_at=None,
+                finished_at=None,
+                worker_ids="",
+                exception_class_path="",
+                traceback="",
+                return_value=None,
+            )
+            msg = f"Reset {updated} task(s) to READY."
+            if blocked:
+                msg += f" Skipped {blocked} running task(s)."
+            messages.success(request, msg)
+        elif action == "delete_completed":
+            deleted, _ = selected_qs.filter(status="SUCCESSFUL").delete()
+            messages.success(request, f"Deleted {deleted} completed task record(s).")
+        elif action == "delete_failed":
+            deleted, _ = selected_qs.filter(status="FAILED").delete()
+            messages.success(request, f"Deleted {deleted} failed task record(s).")
+        else:
+            messages.error(request, "Invalid task action requested.")
+
+        status_q = (request.GET.get("status") or "all").strip().lower()
+        return redirect(f"{reverse('atlas:task_overview')}?status={status_q}")
+
     selected_status = (request.GET.get("status") or "all").strip().lower()
     status_map = {
         "active": ["READY", "RUNNING"],