Titlebook: Linac Radiosurgery; A Practical Guide William A. Friedman,Francis J. Bova,William M. Men Book 1998 Springer-Verlag New York, Inc. 1998 Surg

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Stereotactic Computed Tomography,d, computer technology. The need for a method of exact intracranial localization and reproducible targeting was recognized long ago, but aside from the creation of several craniometric systems that were intended to relate different brain structures to visible or palpable cranial reference points, li

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Stereotactic Magnetic Resonance Imaging,y of the magnetic field. Perturbation of the magnetic field uniformity by the stereotactic frame and localizer may occur, as can perturbations of the magnetic field unique to the individual patient. Perturbations unique to the individual are called .. All of these problems must be eliminated or corr

incision

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Dose Selection,y (centigray or cGy) is equivalent to an older unit of absorbed radiation, the .. The dose is usually prescribed to the isodose line (or shell, in reality) that conforms to the periphery of the target (i.e., the lesion to be treated). For example, the AVM shown in Figure 7.1 was treated with 12.5 Gy

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Radiation Delivery,icrowave wave guide followed by their bombardment of a heavy metal target. These high-energy electrons are stopped in the target and lose most of their energy as heat, but they also lose a small portion of their energy as X-rays (see Fig. 6.1). The X-rays produced have a range of energies with a max

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Patient Follow-Up,urgeon is accustomed to examining the patient in the recovery room and knowing very rapidly whether the immediate outcome of a procedure is good or bad. Radiosurgery has few, if any, acute complications. The only acute complication seen in our patients has been a rare increase in seizure activity in

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University of Florida Results,wn in Table 10.1. Of these patients, 264 had AVMs. There were 131 men and 133 women in this group. The mean age was 39 years (range, 7 to 70 years). Presenting symptoms included hemorrhage (93 patients), seizure (102 patients), headache or incidental symptoms (61 patients), and progressive neurologi

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Stereotactic Radiotherapy,ely. For example, consider an 8-year-old patient with residual craniopharyngioma after aggressive subtotal surgical resection. The residual tumor is densely adherent to the optic chiasm and hypothalamus. Single-fraction radiosurgery would therefore deliver the same dose of radiation to those structu

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