title: An integrated diagnosis and therapeutic system using intra-operative 5-aminolevulinic-acid-induced fluorescence guided robotic laser ablation for precision neurosurgery.
abstract: We have developed an integrated diagnosis and therapeutic system for precision malignant gliomas resection during neurosurgery. A combination of three-dimensional (3-D) magnetic resonance imaging (MRI) navigation and 5-aminolevulinic acid (5-ALA)-induced fluorescence based intra-operative tumor diagnosis technique has been incorporated into a robotic laser ablation neurosurgery system with an automatic focusing and robotic scanning mechanism. 5-ALA is a non-fluorescent prodrug that leads to intracellular accumulation of fluorescent protoporphyrins IX (PpIX) in malignant glioma. The PpIX tends to accumulate in pathological lesions, and emits red fluorescence when excited by blue light. This fluorescence is illuminated with laser excitation, enables intra-operative identification of the position of a tumor and provides guidance for resection with laser photocoagulation. The information provided by the MRI is enhanced by the intra-operative 5-ALA fluorescence data, and this enhanced information is integrated into a robotic laser ablation system. The accuracy of the fluorescent measurement of the tumor is improved using high-precision spectral analysis. The fluorescence assists in the detection of malignant brain tumors intra-operatively and improves their removal rate.
authors.affiliation: Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan. liao@bmpe.t.u-tokyo.ac.jp
authors.forename: Hongen
authors.initials: H
authors.lastname: Liao
authors.forename: Masafumi
authors.initials: M
authors.lastname: Noguchi
authors.forename: Takashi
authors.initials: T
authors.lastname: Maruyama
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Muragaki
authors.forename: Etsuko
authors.initials: E
authors.lastname: Kobayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Iseki
authors.forename: Ichiro
authors.initials: I
authors.lastname: Sakuma
mesh_terms: D021542:Amino Acids, Neutral / Q000172:deficiency; D001932:Brain Neoplasms / Q000473:pathology* / Q000601:surgery*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005456:Fluorescent Dyes; D006801:Humans; D053685:Laser Therapy / Q000295:instrumentation*; D008856:Microscopy, Fluorescence / Q000295:instrumentation*; D019635:Neurosurgical Procedures / Q000295:instrumentation*; D015203:Reproducibility of Results; D012371:Robotics / Q000295:instrumentation*; D012680:Sensitivity and Specificity; D025321:Surgery, Computer-Assisted / Q000295:instrumentation*; D018511:Systems Integration; D016896:Treatment Outcome
chemical_list: D021542:Amino Acids, Neutral; D005456:Fluorescent Dyes; C013809:5-aminovaleric acid