Abstract #4417

Nd:YAG Laser Based Laparoscopic Liver Resection in a 1.0 Tesla High Field Open MRI: Evaluation of Suitable Dynamic MR Sequences for Image Guided Surgery

Sascha Santosh Chopra¹, Guido Schumacher¹, Sven Christian Schmidt¹, Christian Seebauer², Ioannis Papanikolaou³, Ivo Van der Voort³, Florian Streitparth⁴, Jens Rump⁴, Ulf Teichgraeber⁴

¹Dept. of Surgery, Charit Campus Virchow-Clinic; University Medicine Berlin , Berlin, Germany; ²Dept. Trauma Surgery, Charit Campus Virchow-Clinic; University Medicine Berlin; ³Dept. Gastroenterology, Charit Campus Virchow-Clinic; University Medicine Berlin; ⁴Dept. of Radiology, Charit Campus Mitte; University Medicine Berlin

Aim of this study was to identify suitable interactive (dynamic) magnetic resonance (MR) sequences for real time MR guided liver dissection in a 1.0 Tesla high field open MRI Scanner. Four dynamic sequences encompassing balanced steady state free precession (bSSFP), T1W gradient echo (GRE), T2W GRE and T2W fast spin echo (FSE) were analyzed regarding the image quality, artifact susceptibility and the performance of SNR and CNR. The T2W TSE sequence (1.5 seconds/image) was considered superior due to an intraoperative SNR of 6.9 (0.7) and CNR (vessel to parenchyma) of 5.6 (1.7) in the interventional setting. As a proof of concept MR-guided laparoscopic liver resection was performed in two healthy house pigs using the T2W TSE sequence.