diff --git a/app/Services/Pacs/OrthancRestClient.php b/app/Services/Pacs/OrthancRestClient.php
index 67525fb..7435726 100644
--- a/app/Services/Pacs/OrthancRestClient.php
+++ b/app/Services/Pacs/OrthancRestClient.php
@@ -4,11 +4,27 @@
 
 use App\Models\DicomServer;
 use GuzzleHttp\Client;
+use Psr\Http\Message\ResponseInterface;
 
 final class OrthancRestClient
 {
     public function __construct(private readonly DicomServer $orthancHost) {}
 
+    private static function studyPath(string $study_id, ?string $sub = null): string
+    {
+        $parts = ['studies', ltrim($study_id, '/')];
+        if (filled($sub)) {
+            $parts[] = ltrim($sub, '/');
+        }
+
+        return implode('/', $parts);
+    }
+
+    private static function jsonify(ResponseInterface $response, bool $associative = true): mixed
+    {
+        return json_decode($response->getBody()->getContents(), $associative, 512, JSON_THROW_ON_ERROR);
+    }
+
     public function getClient(): Client
     {
         $endpoint = $this->orthancHost->rest_api_endpoint;
@@ -23,38 +39,35 @@ public function getStudyStatistics(string $study_id): array
     {
         $response = $this->getClient()->get('/studies/' . $study_id . '/statistics');
 
-        return json_decode($response->getBody()->getContents(), true, 512, JSON_THROW_ON_ERROR);
+        return self::jsonify($response);
     }
 
     public function getServerStatistics(): array
     {
         $response = $this->getClient()->get('/statistics');
 
-        return json_decode($response->getBody()->getContents(), true, 512, JSON_THROW_ON_ERROR);
-    }
-
-    private static function studyPath(string $study_id, ?string $sub = null): string
-    {
-        $parts = ['studies', ltrim($study_id, '/')];
-        if (filled($sub)) {
-            $parts[] = ltrim($sub, '/');
-        }
-
-        return implode('/', $parts);
+        return self::jsonify($response);
     }
 
     public function getStudySeries(string $study_id): array
     {
         $response = $this->getClient()->get(self::studyPath($study_id, 'series?expand'));
 
-        return json_decode($response->getBody()->getContents(), true, 512, JSON_THROW_ON_ERROR);
+        return self::jsonify($response);
     }
 
     public function getStudyInstances(string $study_id): array
     {
         $response = $this->getClient()->get(self::studyPath($study_id, 'instances?expand'));
 
-        return json_decode($response->getBody()->getContents(), true, 512, JSON_THROW_ON_ERROR);
+        return self::jsonify($response);
+    }
+
+    public function getStudyInstancesList(string $study_id): array
+    {
+        $response = $this->getClient()->get(self::studyPath($study_id, 'instances?expand=0'));
+
+        return self::jsonify($response);
     }
 
     public function getStudyDetails(string $study_id): array
@@ -64,7 +77,7 @@ public function getStudyDetails(string $study_id): array
         ];
         $response = $this->getClient()->get('/studies/' . $study_id . '?' . http_build_query($query));
 
-        return json_decode($response->getBody()->getContents(), true, 512, JSON_THROW_ON_ERROR);
+        return self::jsonify($response);
     }
 
     public function getStudies(): array
@@ -76,7 +89,7 @@ public function getStudies(): array
         $url = '/studies?' . http_build_query($query);
         $response = $this->getClient()->get($url);
 
-        return json_decode($response->getBody()->getContents(), true, 512, JSON_THROW_ON_ERROR);
+        return self::jsonify($response);
     }
 
     public function getStudiesIds(): array