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Lateral positioning technique for the treatment of far-lateral targets with the Leksell gamma knife: technical note
Nicolas Massager1, Jean Régis, Denis Porcheron
1Department of Neurosurgery and Gamma Knife Unit, Erasme Hospital, Brussels, Belgium. nmassager@ulb.ac.be
Objective:
To describe a procedure for Leksell gamma knife (LGK) radiosurgery in a lateral position, for treatment of far-lateral intracranial lesions.
Methods:
Positioning of the patient in the lateral decubitus position during LGK treatment switches the x and y axis coordinates. This increases the range of the x axis from 52 to 148 mm to 40 to 160 mm (i.e., 12 mm in each direction).
Results:
Conversion of the coordinates of the isocenters is easily performed with simple mathematical algorithms and does not impair the precision of target positioning at the isocenters during LGK radiosurgery.
Conclusion:
LGK treatment in the lateral decubitus position is a simple accurate procedure for the treatment of far-lateral lesions that cannot be reached with normal supine positioning.