title: Preoperative RFA simulation for liver cancer using a CT virtual ultrasound system.
abstract: We developed a computed tomography (CT) virtual ultrasound system (CVUS) as an imaging system to support treatment under percutaneous ultrasound (US) guidance. This prototype clinical system, produced in collaboration with Tokyo Medical University, uses display software developed by Toshiba Medical Systems. We examined the utility of this system by scheduling treatment plans preoperatively and simulating puncture and radiofrequency ablation (RFA) for liver cancer. The study enrolled 51 liver cancer patients with 66 nodules 0.8-8cm in diameter in which RFA was performed between June 2004 and December 2004. Virtual US and multiplanar reconstruction (MPR) images were constructed on the basis of DICOM CT data and puncture and ablation of liver cancer were simulated. The following were evaluated: (1) how to avoid complications and determine an appropriate puncture route by simulating puncture with C-mode MPR images; (2) determination of the three-dimensional location of the tumor for ablation, as well as the adjacent organs and vessels, by MPR rotation 360 degrees around the center of the tumor (center lock); and (3) how to determine the center and volume of ablation and avoid injuries to nearby organs and vessels by simulating ablation procedures. C -mode MPR images were effective for (1) determining and modifying the puncture route in 35 of 51 cases (69.6%) and (2) determining the spatial location of vessels and nearby organs in 50 of 51 cases (98.0%) by the center lock; and (3) simulating the ablation helped determine the center and volume of ablation by avoiding injuries to vessels and nearby organs in 45 or 51 cases (88.2%). Taken together, the CVUS allowed easy simulation of local treatment of liver cancer under US guidance using CT data alone and the preoperative simulation predicted an improvement in the safety of local therapy of liver cancer.
authors.affiliation: Fourth Department of Gastroenterology and Hepatology, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjukuku-ku, Tokyo 160-0023, Japan.
authors.forename: Kosei
authors.initials: K
authors.lastname: Kudo
authors.forename: Fuminori
authors.initials: F
authors.lastname: Moriyasu
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Mine
authors.forename: Yuki
authors.initials: Y
authors.lastname: Miyata
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Ryou
authors.initials: R
authors.lastname: Metoki
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kamamoto
authors.forename: Shirou
authors.initials: S
authors.lastname: Suzuki
authors.forename: Masafumi
authors.initials: M
authors.lastname: Shimizu
authors.forename: Takeo
authors.initials: T
authors.lastname: Miyahara
authors.forename: Masato
authors.initials: M
authors.lastname: Yokoi
authors.forename: Toshiya
authors.initials: T
authors.lastname: Horibe
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Yamagata
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006528:Carcinoma, Hepatocellular / Q000601:surgery*; D017115:Catheter Ablation / Q000379:methods*; D003198:Computer Simulation; D004867:Equipment Design; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008113:Liver Neoplasms / Q000378:metabolism / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012984:Software; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014463:Ultrasonography / Q000379:methods; D014584:User-Computer Interface