title: Polyacrylamide gel containing egg white as new model for irradiation experiments using focused ultrasound.
abstract: A polyacrylamide (PAA) gel containing egg white as a new model for irradiation experiments in high-intensity focused ultrasound HIFU is introduced. The gel is transparent except in thermally necrosed regions which are white. The model is similar to, and has the same benefits as, gels containing bovine serum albumin (BSA) protein, but egg is less expensive than BSA. The acoustic properties of the gel are very favorable, similar to those of soft tissues; density 1.0 g/cm(3), sound speed 1540 m/s and acoustic attenuation 0.4 dB/cm at 2 MHz. We illustrate the usefulness of the gel in visualizing HIFU lesions and introduce a new model of gastric submucosal tumor in a rabbit stomach, showing that this gel can be formed into any desired shape. Our PAA gel containing egg white is an attractive candidate for a disposable acoustic material suitable for experimental applications of HIFU.
authors.affiliation: Department of Surgical Oncology, The University of Tokyo, Tokyo 113-8655, Japan. ktakegami-tky@umin.ac.jp
authors.forename: Kenji
authors.initials: K
authors.lastname: Takegami
authors.forename: Yukio
authors.initials: Y
authors.lastname: Kaneko
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Watanabe
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Maruyama
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Nagawa
mesh_terms: D000180:Acrylic Resins; D000818:Animals; D004529:Egg White; D005753:Gastric Mucosa / Q000000981:diagnostic imaging; D008954:Models, Biological; D019047:Phantoms, Imaging; D011817:Rabbits; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging; D014464:Ultrasonic Therapy / Q000379:methods*; D014463:Ultrasonography
chemical_list: D000180:Acrylic Resins; C016680:polyacrylamide gels