diff --git a/app/DataTables/WorklistDataTable.php b/app/DataTables/WorklistDataTable.php
index 85afa36..ebbac8a 100644
--- a/app/DataTables/WorklistDataTable.php
+++ b/app/DataTables/WorklistDataTable.php
@@ -274,11 +274,27 @@ private function physicianColumn(Study $study): ?string
     {
         $user = $study->readingPhysician;
         if ($user === null) {
+            $html = '';
+
             if ($study->assigned_at !== null) {
-                return '<img src="' . asset('imgs/checklist.png') . '" data-bs-toggle="tooltip" data-bs-placement="right" title="Assigned on ' . $study->assigned_at->format(self::DATE_FORMAT_LONG) . '">';
+                $html .= Blade::render('_partials._img-tooltip',
+                    [
+                        'src' => asset('imgs/assigned.png'),
+                        'class' => 'msg-icon',
+                        'tip' => 'Assigned on ' . $study->assigned_at->format(self::DATE_FORMAT_LONG),
+                    ]);
             }
 
-            return null;
+            if ($study->isLocked()) {
+                $html .= Blade::render('_partials._img-tooltip',
+                    [
+                        'src' => asset('imgs/lock.png'),
+                        'class' => 'ms-1 msg-icon',
+                        'tip' => 'Locked on ' . $study->locked_at->format(self::DATE_FORMAT_LONG),
+                    ]);
+            }
+
+            return $html;
         }
 
         $dt = $study->read_at;
@@ -317,7 +333,7 @@ private function renderCustomColumns(): array
                 case WorklistColumn::AssignedPhysician:
                     $columns[$col->value] = static function (Study $study) {
                         if ($study->assigned_at !== null) {
-                            return '<img src="' . asset('imgs/checklist.png') . '" data-bs-toggle="tooltip" data-bs-placement="right" title="' . $study->assigned_at->format(self::DATE_FORMAT_LONG) . '">';
+                            return '<img src="' . asset('imgs/assigned.png') . '" data-bs-toggle="tooltip" data-bs-placement="right" title="' . $study->assigned_at->format(self::DATE_FORMAT_LONG) . '">';
                         }
 
                         return null;
@@ -435,7 +451,7 @@ private function generateActionButtons(Study $study): string
                     $btns[] = $this->renderImageLink($study->hash, 'info.png', 'showStudy', 'Info');
                     break;
                 case WorklistButton::Assign:
-                    $btns[] = $this->renderImageLink($study->hash, 'doctor.png', 'show-assign', 'Assign');
+                    $btns[] = $this->renderImageLink($study->hash, 'assign.png', 'show-assign', 'Assign');
                     break;
                 case WorklistButton::Notes:
                     $btns[] = $this->renderImageLink($study->hash, 'chat.png', 'show-notes', 'Chat');
diff --git a/app/Models/Study.php b/app/Models/Study.php
index eaa7086..7a5d516 100644
--- a/app/Models/Study.php
+++ b/app/Models/Study.php
@@ -492,6 +492,7 @@ protected function casts(): array
             'read_at' => 'immutable_datetime',
             'assigned_at' => 'immutable_datetime',
             'study_date' => 'immutable_datetime',
+            'locked_at' => 'immutable_datetime',
             'patient_birthdate' => 'immutable_date',
         ];
     }
diff --git a/resources/imgs/assign.png b/resources/imgs/assign.png
index 36f9208..013c407 100644
Binary files a/resources/imgs/assign.png and b/resources/imgs/assign.png differ
diff --git a/resources/imgs/assigned.png b/resources/imgs/assigned.png
new file mode 100644
index 0000000..02be686
Binary files /dev/null and b/resources/imgs/assigned.png differ
diff --git a/resources/imgs/lock.png b/resources/imgs/lock.png
new file mode 100644
index 0000000..5b49ff5
Binary files /dev/null and b/resources/imgs/lock.png differ
diff --git a/resources/views/_partials/_img-tooltip.blade.php b/resources/views/_partials/_img-tooltip.blade.php
new file mode 100644
index 0000000..ba6d37a
--- /dev/null
+++ b/resources/views/_partials/_img-tooltip.blade.php
@@ -0,0 +1 @@
+<img src="{{ $src }}" class="{{ $class }}" data-bs-toggle="tooltip" data-bs-placement="top" title="{{ $tip }}">
diff --git a/resources/views/staff/worklist/index.blade.php b/resources/views/staff/worklist/index.blade.php
index 7388924..627e457 100644
--- a/resources/views/staff/worklist/index.blade.php
+++ b/resources/views/staff/worklist/index.blade.php
@@ -40,6 +40,15 @@
     ])
 @endsection
 
+@section('page-style')
+    <style>
+        .msg-icon {
+            width: 18px !important;
+            height: 18px !important;
+        }
+    </style>
+@endsection
+
 @section('page-script')
     @vite([
         //'resources/assets/js/forms-pickers.js',