Use of Virtual Target Fluoroscopic Display of Three-Dimensional CO2 Wedged Hepatic Vein Portography for TIPS Placement

2021 ◽  
Author(s):  
Thomas Leger ◽  
Arthur Petit ◽  
Yassine Moustarhfir ◽  
Yves Ajavon ◽  
Nicolas Sellier ◽  
...  
Keyword(s):  
Hepatic Vein ◽  
Three Dimensional ◽  
Virtual Target

scholarly journals Design of Three-Dimensional Path Following Guidance Logic

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Sungsu Park
Keyword(s):  
Numerical Simulations ◽  
Three Dimensional ◽  
Path Following ◽  
Guidance Law ◽  
Virtual Target ◽  
Projection Point ◽  
Motion Strategy

This paper presents a three-dimensional path following guidance logic. The proposed guidance logic is composed of the guidance law and the motion strategy of virtual target along the desired path. The guidance law makes a vehicle purse the virtual target, and the motion strategy explicitly specifies the motion of virtual target by introducing the concept of the projection point and the tangentially receding distance. The proposed logic is simple and efficient and yet provides precise path following. Numerical simulations are performed to demonstrate the effectiveness of the proposed guidance logic.

FRACTAL PROPERTIES, SEGMENT ANATOMY, AND INTERDEPENDENCE OF THE HUMAN PORTAL VEIN AND THE HEPATIC VEIN IN 3D

Fractals ◽  
2003 ◽  
Vol 11 (01) ◽  
pp. 53-62 ◽  
Author(s):  
HORST K. HAHN ◽  
CARL J. G. EVERTSZ ◽  
HEINZ-OTTO PEITGEN ◽  
JEAN H. D. FASEL
Keyword(s):  
Portal Vein ◽  
Hepatic Vein ◽  
Three Dimensional ◽  
Branching Ratio ◽  
Liver Parenchyma ◽  
Hepatic Veins ◽  
Scaling Properties ◽  
Computed Tomography Images ◽  
Fractal Properties ◽  
Human Livers

The scaling properties of the portal vein and the hepatic vein are examined, based on three-dimensional computed tomography images of casts of human livers. In particular, a quantitative analysis of the branching ratio based on the Strahler ordering scheme as well as the diameter and length ratios are performed. To quantify the segment anatomy of the liver, the volume of supplied liver parenchyma is measured and related to the corresponding vessel radius. The implications of these findings for segment-oriented liver surgery are discussed. We also investigate the 3D interdependence of the intertwined portal and hepatic veins based on a concept of tree distance that will be introduced.

scholarly journals A Three-Dimensional Guidance Logic for Continuous Curvature Path Following

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Sungsu Park
Keyword(s):  
Numerical Simulations ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Path Following ◽  
Guidance Law ◽  
Virtual Target ◽  
Practical Guidance ◽  
Continuous Curvature ◽  
Projection Point ◽  
Three Dimensional Space

A new simple and practical guidance logic is proposed for a vehicle to follow a general continuous curvature path defined in a three-dimensional space. The proposed guidance logic is formulated in such a way that the guidance law is to generate the command acceleration such that a vehicle pursues the designed moving virtual target, and this eventually makes a vehicle to follow a desired path. The position and velocity of the virtual target are specified explicitly by introducing the concept of the projection point and the tangentially receding distance. Numerical simulations are conducted to evaluate the precise path-following capability of the proposed guidance logic.

scholarly journals Preserving inferior right hepatic vein enabled bisegmentectomy 7 and 8 without venous congestion: a case report

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Masayoshi Terayama ◽  
Kyoji Ito ◽  
Nobuyuki Takemura ◽  
Fuyuki Inagaki ◽  
Fuminori Mihara ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hepatic Vein ◽  
Three Dimensional ◽  
Venous Drainage ◽  
Injection Technique ◽  
Remnant Liver ◽  
Right Hepatectomy ◽  
Dimensional Simulation ◽  
The Right ◽  
Right Hepatic Vein

Abstract Background In hepatectomy, the preservation of portal perfusion and venous drainage in the remnant liver is important for securing postoperative hepatic function. Right hepatectomy is generally indicated when a hepatic tumor involves the right hepatic vein (RHV). However, if a sizable inferior RHV (IRHV) exists, hepatectomy with preservation of the IRHV territory may be another option. In this case, we verified the clinical feasibility of anatomical bisegmentectomy 7 and 8 with RHV ligation, averting the right hepatic parenchyma from venous congestion, utilizing the presence of the IRHV. Case presentation A 70-year-old man was presented with a large hepatic tumor infiltrating the RHV on computed tomography during a medical checkup. The patient was diagnosed with hepatocellular carcinoma (HCC), T2N0M0, stage III. Right hepatectomy was first considered, but multi-detector computed tomography (MDCT) also revealed a large IRHV draining almost all of segments 5 and 6, suggesting that IRHV-preserving liver resection may be another option. The calculated future remnant liver volumes were 382 mL (26.1% of the total volume) after right hepatectomy and 755 mL (51.7% of the total volume) after anatomical bisegmentectomy 7 and 8; therefore, we scheduled IRHV-preserving anatomical bisegmentectomy 7 and 8 considering the prevention of postoperative liver failure and increased chance of performing repeat resections in cases of recurrence. Preoperative three-dimensional simulation using MDCT clearly revealed the portal perfusion area and venous drainage territories by the RHV and IRHV. There was an issue with invisibility of the anatomical resection line of segments 7 and 8, which was completely dissolved by intraoperative ultrasonography using Sonazoid and the portal dye injection technique with counter staining. The postoperative course in the patient was uneventful, without recurrence of HCC, for 30 months after hepatectomy. Conclusions IRHV-preserving anatomical bisegmentectomy 7 and 8 is a safe and feasible procedure utilizing the three-dimensional simulation of the portal perfusion area and venous drainage territories and the portal dye injection technique.

Total resection of the right hepatic vein drainage area with the aid of three-dimensional computed tomography

Surgery Today ◽  
2011 ◽  
Vol 42 (1) ◽  
pp. 46-51 ◽  
Author(s):  
Akinobu Taketomi ◽  
Kazuki Takeishi ◽  
Yohei Mano ◽  
Takeo Toshima ◽  
Takashi Motomura ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hepatic Vein ◽  
Three Dimensional ◽  
Drainage Area ◽  
Total Resection ◽  
The Right ◽  
Right Hepatic Vein

scholarly journals Anatomical Study of the Hepatic Veins in Segment 4 of the Liver Using Three-Dimensional Visualization

2021 ◽  
Vol 8 ◽  
Author(s):  
Jun Zhang ◽  
Xiaochao Guo ◽  
Qilu Qiao ◽  
Jianxun Zhao ◽  
Xin Wang
Keyword(s):  
Hepatic Vein ◽  
3D Visualization ◽  
Venous Blood ◽  
Three Dimensional ◽  
Morphological Characteristics ◽  
Hepatic Veins ◽  
Hepatic Surgery ◽  
Visualization System ◽  
Vein System ◽  
Visualization Technology

Objective: The current study aimed to examine the anatomical structure of the hepatic vein of segment IV liver (S4) of the liver using three-dimensional (3D) visualization technology in order to explore the surgical value of the middle hepatic vein (MHV) manipulation and highlight the importance of current research in hepatic surgery.Methods: Between January 2014 and December 2019, 52 patients with abdominal diseases(not including hepatic disease) were selected for multiphasic computed tomography-enhanced scans of the upper abdomen. A 3D visualization system was utilized to display the structural details of the hepatic veins in S4 of their livers. Couinaud's eight-segment classification system was used to denote the liver' sections.Results: The constructed 3D model clearly displayed vascular morphological characteristics and their location in the liver, hepatic artery and vein system, and portal vein system. Of the 52 patients, 43 had an umbilical fissure vein (UFV) (82.7%), 19 had an accessory S4 liver vein (36.5%), 16 had both a UFV (30.8%) and an accessory S4 liver vein, and 6 had neither (11.5%). A total of 79% of the patients with a UFV and 74.2% of those with an accessory S4 liver vein had venous blood returning into the left hepatic vein.Conclusion: 3D visualization technology was used to determine hepatic venous return of S4 hepatic veins and was found to improve the safety of evaluation in hepatic surgery.

scholarly journals Ex Vivo Liver Resection and Autotransplantation as Surgical Option for Zone II–III Leiomyosarcoma of IVC: A Case Report and Literature Review

2021 ◽  
Vol 11 ◽  
Author(s):  
Tuerhongjiang Tuxun ◽  
Tao Li ◽  
Shadike Apaer ◽  
Yi-Biao He ◽  
Lei Bai ◽  
...  
Keyword(s):  
Liver Resection ◽  
Hepatic Vein ◽  
Ex Vivo ◽  
Three Dimensional ◽  
Vena Cava ◽  
Hepatic Veins ◽  
Budd Chiari Syndrome ◽  
Hepatic Recurrence ◽  
Chiari Syndrome ◽  
Zone Ii

We report the first documented case of leiomyosarcoma at zone II-III of inferior vena cava with thrombi in three hepatic veins undergoing ex vivo liver resection and autotransplantation (ELRA) and hepatic veins thrombectomy. A 33-year-old female patient presented with abdominal distention and lower extremities edema. Abdominal wall varicosis and shifting dullness were positive on physical examination. Her liver function was classified as Child-Pugh B and a solid tumor at retro-hepatic vena cava extending to right atrium with thrombi in three hepatic veins were confirmed. The diagnosis of leiomyosarcoma with Budd-Chiari syndrome was highly suspected with preoperative ultrasound, echocardiogram, CT scan, and three-dimensional reconstruction. A zone II-III leiomyosarcoma of IVC origin was confirmed at surgery and ex vivo liver resection and autotransplantation, and hepatic vein thrombectomy with atrial reconstruction were performed under cardiopulmonary bypass (CPB). Operative time, anhepatic time, and CPB time were 12 h, 128 min, and 84 min, respectively. The patients experienced post-operative liver dysfunction and was cured with conservative therapy. Hepatic recurrence two years after surgery was managed with radiofrequency. The patient was alive with liver metastasis three years after surgery. Despite being regarded as an extremely aggressive procedure, ELRA could be considered in the treatment of advanced leiomyosarcoma with Budd-Chiari syndrome and hepatic vein thrombi.

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