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Antônio A F. De Salles and Iñaki Manchola

end-tidal carbon dioxide partial pressure — a transcranial ultrasound Doppler study. J Cereb Blood Flow Metab 4 : 368 – 372 , 1984 Markwalder TM, Grolimund P, Seiler RW, et al: Dependency of blood flow velocity in the middle cerebral artery on end-tidal carbon dioxide partial pressure — a transcranial ultrasound Doppler study. J Cereb Blood Flow Metab 4: 368–372, 1984 26. Pucher RK , Auer LM : Effects of vasospasm in the middle cerebral artery territory on flow velocity and volume flow. A computer simulation. Acta

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Han Soo Chang and Takaaki Kirino

general population. The first assumption is supported by the findings of Juvela, et al. , 16 that the rupture rate of unruptured aneurysms in their series was constant in the first, second, and the third decade of follow up. The second assumption can be justified by considering that death caused by SAH shares only a small proportion in the deaths from all causes. 22 If we consider the fact that some proportion of ruptured aneurysms are surgically treated and some patients are cured, we then need a more sophisticated analysis using the Markov process and a computer

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Bernhard Zünkeler, Richard E. Carson, Jeffrey Olson, Ronald G. Blasberg, Mary Girton, John Bacher, Peter Herscovitch and Edward H. Oldfield

-totumour transport of 82 Rb. I: Error analysis and computer simulations. Phys Med Biol 34 : 1773 – 1784 , 1989 Dhawan V, Poltorak A, Moeller JR, et al: Positron emission tomographic measurement of blood-to-brain and blood-totumour transport of 82 Rb. I: Error analysis and computer simulations. Phys Med Biol 34: 1773–1784, 1989 10. Ehrlich P : Das Sauerstoffbedürfnis des Organismus. Eine farbenanalytische Studie. Berlin : Verlag von August Hirschwald , 1885 , pp 69 – 70 Ehrlich P: Das Sauerstoffbedürfnis des Organismus. Eine

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Performance Computing Symposium 1995, “Grand Challenges in Computer Simulation.” San Diego : Society for Computer Simulation , 1995 , pp 552 – 560 Subramaniam RP, Neff SR, Rahulkumar P: A numerical study of the biomechanics of structural neurologic diseases, in Trentner AM (ed): High Performance Computing Symposium 1995, “Grand Challenges in Computer Simulation.” San Diego: Society for Computer Simulation, 1995, pp 552–560 Neurosurgical Forum: Letters to the Editor Response Christopher E. Wolfla , M

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Bernhard Zünkeler, Richard E. Carson, Jeff Olson, Ronald G. Blasberg, Hetty Devroom, Robert J. Lutz, Stephen C. Saris, Donald C. Wright, William Kammerer, Nicholas J. Patronas, Robert L. Dedrick, Peter Herscovitch and Edward H. Oldfield

– 74 , 1988 Dhawan V, Jarden JO, Strother S, et al: Effect of blood curve smearing on the accuracy of parameter estimates for 82 Rb/PET studies of blood-brain barrier permeability. Phys Med Biol 33: 61–74, 1988 14. Dhawan V , Poltorak A , Moeller JR , et al : Positron emission tomographic measurement of blood-to-brain and blood-to-tumour transport of 82 Rb. I: Error analysis and computer simulations. Phys Med Biol 34 : 1773 – 1784 , 1989 Dhawan V, Poltorak A, Moeller JR, et al: Positron emission tomographic

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.3171/jns.1997.86.2.0297 Waveform changes due to conduction block and their underlying mechanism in spinal somatosensory evoked potential: a computer simulation Toshikazu Tani Takahiro Ushida Hiroshi Yamamoto Yoshiyasu Okuhara February 1997 86 2 303 310 10.3171/jns.1997.86.2.0303 Brachial plexus compression by venous aneurysms Eric M. Gabriel Allan H. Friedman February 1997 86 2 311 311 10.3171/jns.1997.86.2.0311 Hydatid cyst and brain tumor in the same location José Enrique Cohen Howard J. Ginsberg Eve C

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Toshikazu Tani, Takahiro Ushida, Hiroshi Yamamoto and Yoshiyasu Okuhara

fibers at a temperature of 37.1°C: Equations 5, 6, and 7 yield: Computer Techniques and Supplies The program for computer simulation was written in Quick Basic Version 4.5 (Microsoft Corp., Redmond, WA) running under MS-DOS Version 3.3C on a PC 9801 (NEC Corp., Tokyo, Japan). In the process of digital-to-analog conversion for displaying calculated values on a CRT screen, a time resolution of 0.05 msec was used. A negative potential calculated was displayed as an upward deflection. Simulation of the SSEP Because each charge contributes

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Michael T. Lawton, Ronald Jacobowitz and Robert F. Spetzler

53. Rekate HL : Circuit diagram of the circulation of cerebrospinal fluid. Pediatr Neurosurg 21 : 248 – 253 , 1994 Rekate HL: Circuit diagram of the circulation of cerebrospinal fluid. Pediatr Neurosurg 21: 248–253, 1994 54. Rekate HL , Brodkey JA , Chizeck HJ , et al : Ventricular volume regulation: a mathematical model and computer simulation. Pediatr Neurosci 14 : 77 – 84 , 1988 Rekate HL, Brodkey JA, Chizeck HJ, et al: Ventricular volume regulation: a mathematical model and

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Gary Redekop, Karel TerBrugge, Walter Montanera and Robert Willinsky

the AVM nidus. One of these patients had been treated with stereotactic radiosurgery and one with a combination of stereotactic radiosurgery and embolization. These results are interesting in light of recent experimental observations reported by Gao, et al., 8 who used a computer simulation model to estimate the magnitude of pressure changes along the vascular tree during stepwise occlusion of an AVM. Prior to AVM obliteration, there is a progressive decrease in arterial pressure along feeding artery pedicles. As the AVM is occluded and flow decreases, the mean

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Toru Koyama, Hiroshi Okudera and Shigeaki Kobayashi

: Microsurgical anatomy of the upper basilar artery and the posterior circle of Willis. J Neurosurg 46: 563–578, 1977 27. Takizawa H , Sugiura K , Baba M , et al : Analysis of intracerebral hematoma shapes by numerical computer simulation using the finite element method. Neurol Med Chir 34 : 65 – 69 , 1994 Takizawa H, Sugiura K, Baba M, et al: Analysis of intracerebral hematoma shapes by numerical computer simulation using the finite element method. Neurol Med Chir 34: 65–69, 1994 28. Tampieri D , Leblanc R , Oleszek J , et al : Three