Stereotactic Radiosurgery of Deeply Seated Low Grade Gliomas

The authors report the results of a series of 16 cases of low-grade gliomas in whom radiosurgery was performed. This series started in 1977. All the tumours received a single radiosurgical session (with a mean dose of 21.7 Gy, 5–10mm. collimator; one patient received two sessions and in another patient two different targets were irradiated in the same session). Prior to radiosurgery, six patients received conventional external fractionated radiotherapy, with two lateral fields of up to 10 × 10 cm. and a mean dose of 55.1 Gy. and another six patients with tumours less than 5 cm. in diameter, received stereotactic radiotherapy using four fields of up to 5 × 5 cm. and a mean dose of 53.1 Gy. I…

L'EVAR negli AAA con neoplasia concomitante

An approach to evaluation of sheet bending force under successive multiaxial stress condition

A new bending under tension test is presented in this paper. This method tries to evaluate bending forces in sheet under successive multiaxial stress condition. This test is carried out in only one step with a pinned cylinder over a material that has been previously deformed to pure shear condition. Due to that, the bending process is made under higher back tension forces than the ones involved in the common methods previously studied in the literature. This entails high pressure values in the sheet-bending tool contact that affects the corresponding friction process. Material is strongly strengthened as a consequence of the deformation practiced in it, and as a result of that, bending forc…