PMID: 9635712Jul 4, 1998Paper

Defining the superior border of posterior fossa radiation treatment fields

International Journal of Radiation Oncology, Biology, Physics
J A DrayerE C Halperin

Abstract

Lateral posterior fossa treatment fields are usually defined on traditional simulation films based on bony landmarks. The superior field border, intended to include the apex of the tentorium cerebelli, is frequently difficult to define. While sagittal magnetic resonance imaging (MRI) images or three-dimensional treatment planning tools are good means to locate the tentorial apex, these are not always available. We herein describe a method for locating the tentorial apex based on bony landmarks. Midsagittal magnetic resonance images of 53 patients were reviewed. Using a Cartesian grid, the geometric relationship between the tentorial apex and several bony landmarks was assessed. Two lines were defined: the first connected the posterior clinoid and the internal occipital protuberance (AB). The second was perpendicular to the first, included the tentorial apex, and extended from the base of the skull inferiorly to the "crown" of the skull superiorly (DE). Relationships between measurements were made using linear regression and least square fits. Line DE was within 5 mm of the perpendicular bisector of line AB in 83% (44/53) of patients. The tentorial apex was located within 10 mm of the midpoint of DE in 91% (48/53) of patients. I...Continue Reading

References

Oct 11, 1992·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·R K Ten HakenD L McShan
Apr 1, 1991·International Journal of Radiation Oncology, Biology, Physics·J RosenmanJ E Tepper
Aug 1, 1988·International Journal of Radiation Oncology, Biology, Physics·R MohanZ Fuks
Feb 1, 1982·International Journal of Radiation Oncology, Biology, Physics·M V PilepichC A Perez
Jul 1, 1980·International Journal of Radiation Oncology, Biology, Physics·S O AsbellA S Baker
Nov 15, 1994·International Journal of Radiation Oncology, Biology, Physics·C A PerezJ M Michalski
Mar 1, 1997·International Journal of Radiation Oncology, Biology, Physics·C WooJ R Cassady

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Citations

Sep 16, 1999·International Journal of Radiation Oncology, Biology, Physics·C CarrieJ L Habrand
Feb 8, 2000·International Journal of Radiation Oncology, Biology, Physics·A C PaulinoS Jeswani
Jan 22, 2000·Radiology·A R Margulis, J H Sunshine
Nov 24, 2006·The British Journal of Radiology·J M WilkinsonE Murphy

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