title: Three-dimensional path planning software-assisted transjugular intrahepatic portosystemic shunt: a technical modification.
abstract: OBJECTIVE
  This study was designed to report our results with a modified technique of three-dimensional (3D) path planning software assisted transjugular intrahepatic portosystemic shunt (TIPS).
  
  
  METHODS
  3D path planning software was recently developed to facilitate TIPS creation by using two carbon dioxide portograms acquired at least 20° apart to generate a 3D path for overlay needle guidance. However, one shortcoming is that puncturing along the overlay would be technically impossible if the angle of the liver access set and the angle of the 3D path are not the same. To solve this problem, a prototype 3D path planning software was fitted with a utility to calculate the angle of the 3D path. Using this, we modified the angle of the liver access set accordingly during the procedure in ten patients.
  
  
  RESULTS
  Failure for technical reasons occurred in three patients (unsuccessful wedged hepatic venography in two cases, software technical failure in one case). The procedure was successful in the remaining seven patients, and only one needle pass was required to obtain portal vein access in each case. The course of puncture was comparable to the 3D path in all patients. No procedure-related complication occurred following the procedures.
  
  
  CONCLUSIONS
  Adjusting the angle of the liver access set to match the angle of the 3D path determined by the software appears to be a favorable modification to the technique of 3D path planning software assisted TIPS.
authors.affiliation: Institute of Interventional Radiology, West China Hospital of Sichuan University, 37 Guoxue Lane, Chengdu, 610041, Sichuan, China, 80732059@qq.com.
authors.forename: Jiaywei
authors.initials: J
authors.lastname: Tsauo
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Luo
authors.forename: Linchao
authors.initials: L
authors.lastname: Ye
authors.forename: Xiao
authors.initials: X
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D004932:Esophageal and Gastric Varices / Q000601:surgery*; D005260:Female; D006503:Hepatic Veins; D006801:Humans; D021621:Imaging, Three-Dimensional; D008099:Liver / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000000981:diagnostic imaging; D019168:Portasystemic Shunt, Transjugular Intrahepatic / Q000379:methods*; D015641:Radiography, Interventional; D012984:Software; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed