diff --git a/app/Services/Pacs/StudyImporter.php b/app/Services/Pacs/StudyImporter.php
index 88552e0..c9687cf 100644
--- a/app/Services/Pacs/StudyImporter.php
+++ b/app/Services/Pacs/StudyImporter.php
@@ -28,18 +28,18 @@ public function scanStudies()
         $this->study_ids = $this->client->getStudiesIds();
     }
 
-    private function checkUpdate(string $orthanc_uid): void
+    private function checkUpdate(string $orthanc_uuid): void
     {
-        $row = DB::table('studies')->where('orthanc_uid', $orthanc_uid)->first(['id', 'study_status']);
+        $row = DB::table('studies')->where('orthanc_uuid', $orthanc_uuid)->first(['id', 'study_status']);
 
         if ($row === null) {
-            $this->insert_queue[] = $orthanc_uid;
+            $this->insert_queue[] = $orthanc_uuid;
 
             return;
         }
 
         if ($row->study_status < StudyLevelStatus::StudyArrived->value) {
-            $this->update_queue[$orthanc_uid] = $row->id;
+            $this->update_queue[$orthanc_uuid] = $row->id;
         }
     }
 
@@ -70,16 +70,16 @@ private function fetchStudyDetails(string $orthanc_uid): ?array
 
     public function importStudies()
     {
-        foreach ($this->update_queue as $orthanc_uid => $row_id) {
-            $study = $this->fetchStudyDetails($orthanc_uid);
+        foreach ($this->update_queue as $orthanc_uuid => $row_id) {
+            $study = $this->fetchStudyDetails($orthanc_uuid);
             if ($study == null) {
                 continue;
             }
             $this->updateStudy($row_id, $study);
         }
 
-        foreach ($this->insert_queue as $orthanc_uid) {
-            $study = $this->fetchStudyDetails($orthanc_uid);
+        foreach ($this->insert_queue as $orthanc_uuid) {
+            $study = $this->fetchStudyDetails($orthanc_uuid);
             if ($study == null) {
                 continue;
             }
@@ -93,7 +93,7 @@ private function prepareData(mixed $orthanc_src): array
         $inst_id = InstituteMapper::map($inst_name);
 
         $study = [
-            'orthanc_uid' => strtolower($orthanc_src['ID']),
+            'orthanc_uuid' => strtolower($orthanc_src['ID']),
             'is_locked' => false,
             'is_active' => true,
 
@@ -137,18 +137,19 @@ private function prepareData(mixed $orthanc_src): array
         }
         $this->setValue($study, 'study_description', trim($descr));
 
-        $details = [
+        $properties = [
             'software_versions' => data_get($study, 'RequestedTags.SoftwareVersions'),
             'station_name' => data_get($study, 'RequestedTags.StationName'),
             'operators_name' => data_get($study, 'RequestedTags.OperatorsName'),
             'manufacturer' => data_get($study, 'RequestedTags.Manufacturer'),
             'manufacturer_model_name' => data_get($study, 'RequestedTags.ManufacturerModelName'),
         ];
+        $properties = array_purge($properties);
 
         $series = [];
         foreach (data_get($orthanc_src, 'Series', []) as $ser) {
             $params = [
-                'orthanc_uid' => strtolower($ser['ID']),
+                'orthanc_uuid' => strtolower($ser['ID']),
                 'series_instance_uid' => data_get($ser, 'MainDicomTags.SeriesInstanceUID'),
                 'series_date' => DicomUtils::dateTimeToCarbon($ser['MainDicomTags']['SeriesDate'], $ser['MainDicomTags']['SeriesTime']),
                 'series_number' => data_get($ser, 'MainDicomTags.SeriesNumber'),
@@ -159,16 +160,23 @@ private function prepareData(mixed $orthanc_src): array
                 'sequence_name' => data_get($ser, 'MainDicomTags.SequenceName'),
             ];
             $params['num_instances'] = count(data_get($ser, 'Instances', []));
-            $params = array_filter($params, fn ($v) => filled($v));
+            $params = array_purge($params);
             if (! empty($params)) {
-                $series[] = array_filter($params, fn ($v) => filled($v));
+                $series[] = $params;
             }
         }
 
-        $study = array_filter($study, fn ($v) => filled($v));
-        $details = array_filter($details, fn ($v) => filled($v));
+        if (empty($series)) {
+            $series = null;
+        }
+        if (empty($properties)) {
+            $properties = null;
+        }
+        $details = compact('properties', 'series');
+        $details = array_purge($details);
+        $study = array_purge($study);
 
-        return compact('study', 'details', 'series');
+        return compact('study', 'details');
     }
 
     private function setValue(array &$array, string $key, mixed $value): void
@@ -181,7 +189,7 @@ private function setValue(array &$array, string $key, mixed $value): void
     private function updateStudy(int $row_id, mixed $study): void
     {
         $payload = $this->prepareData($study);
-        unset($payload['study']['orthanc_uid']);
+        unset($payload['study']['orthanc_uuid']);
         $payload['study']['updated_at'] = now();
         DB::table('studies')->where('id', $row_id)->update($payload['study']);
 
@@ -189,13 +197,6 @@ private function updateStudy(int $row_id, mixed $study): void
             $payload['details']['updated_at'] = now();
             DB::table('study_details')->where('study_id', $row_id)->update($payload['details']);
         }
-
-        foreach ($payload['series'] as $series) {
-            $series_guid = $series['orthanc_uid'];
-            unset($series['orthanc_uid']);
-            $series['updated_at'] = now();
-            DB::table('study_series')->where('orthanc_uid', $series_guid)->update($series);
-        }
     }
 
     private function insertStudy(mixed $study): void
@@ -204,11 +205,5 @@ private function insertStudy(mixed $study): void
         $row = Study::create($payload['study']);
         $payload['details']['study_id'] = $row->id;
         StudyDetails::create($payload['details']);
-
-        foreach ($payload['series'] as $series) {
-            $series['study_id'] = $row->id;
-            $series['created_at'] = now();
-            DB::table('study_series')->insert($series);
-        }
     }
 }
diff --git a/app/helpers.php b/app/helpers.php
index 6ba4fe2..12985f7 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -22,3 +22,10 @@ function audit(): ActivityLogger
         return app(ActivityLogger::class);
     }
 }
+
+if (! function_exists('array_purge')) {
+    function array_purge(array $ary): array
+    {
+        return array_filter($ary, fn ($v) => filled($v));
+    }
+}
diff --git a/database/migrations/2024_12_27_060234_create_studies_table.php b/database/migrations/2024_12_27_060234_create_studies_table.php
index e94858a..3bd832c 100644
--- a/database/migrations/2024_12_27_060234_create_studies_table.php
+++ b/database/migrations/2024_12_27_060234_create_studies_table.php
@@ -14,7 +14,7 @@ public function up(): void
     {
         Schema::create('studies', function (Blueprint $table) {
             $table->id();
-            $table->string('orthanc_uid')->unique();
+            $table->string('orthanc_uuid')->unique();
             $table->boolean('is_archived')->default(false);
             $table->boolean('is_locked')->default(false);
             $table->unsignedTinyInteger('study_priority')->default(0);