3[3]Dohrmann G J, Rubin JM. Intraopterative Diagnostic Ultrasound. In:Wilkins RH, Rengachary SS (eds). Neurosurgery Vol. l. New:McGraw-Hill Book Compancy, 1985, 457～462.
4[4]LeRoux PD, Winter TC, Berger MS, et al. A Comparison Between Preoperative Magnetic Resonance and Intraoperative Ultrasound Tumor Volumes and Margins. J Clin Ultrasound, 1994, 22:29.
5[5]Fornage BD. Measuring masses on cross-sectional images. Radiology 1993, 187:289.
6[6]Smith S J, Vogelzang R1, Marzano MI, et al. Brain edema: Ultrasound examination. Radiology, 1985, 155:379～382.
7[7]Kavukanogas J. Nonneoplastic indications for neurosurgical intraoperative uhrasonography. EUROSON'87. Neurosonography/intraoperative Session. The 6th Congress of the European Federation of Societies for Ultrasound in Medicine and Biology. Jun 14～18,1987, Helsinki, Finland.
8[8]Mayfrank L, Bertalanffy h, Spetzger u, et al. Ultrasound-Guided Craniotomy for Minimal Invasive Exposure of Cerebral Covexity Lesion. Acta Neurochir, 1994, 131 : 270.
9[9]Kunz U, Goldmann A, Bader C, et al. Stereotactic and Ultrasound Guided Minimal Invasive Surgery of Subcortical Cavernomas. Minim Invasive Neurosurg, 1994, 37:17.
10[10]Resch KD, Reisch R. Endo-neuro-Sonography: Anatomic Aspects of the Ventricles. Minim Invasive Neurosurg, 1997, 40: 2.
8Jodicke A, Deinsberger W, Erbe H, et al. Intraoperative threedimensional ultrasonography: an approach to register brain shift using multidimensional image processing. Minim Invasive Neurosurg, 1998,41 : 13-19.
9Gronningsaeter A, KLeven A,Ommedal S ,et al. An ultrasoundbased neuronavigation system. Neurosurgery, 2000, 47: 1373-1378.
10Hata N, Dohi T,lseki H. Development of a frameless and armless stereotactic neuronavigation system with ultrasonographic registion. Neurosurgery,1997, 41 : 608-613.
