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Daily positioning accuracy of frameless stereotactic radiation therapy with a fusion of computed tomography and linear accelerator (focal) unit: evaluation of z-axis with a z-marker
Authors:Minoru Uematsu   Marcel Sonderegger   Akira Shioda   Kazuhiko Tahara   Toshiharu Fukui   Yukihiro Hama   Tadaharu Kojima   James R. Wong  Shoichi Kusano
Affiliation:a Division of Radiation Oncology, National Defense Medical College, 3-2, Namiki, Tokorozawa, Saitama, 359, Japan;b Department of Precision Machinery Engineering, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113, Japan;c Department of Radiation Oncology, Morristown Memorial Hospital, Morristown, NJ 07962-1956, USA
Abstract:To evaluate quantitative positioning errors of frameless stereotactic radiation therapy with a fusion of computed tomography (CT) and linear accelerator unit, Z-type CT markers were attached to patients, and CT images were obtained before and after daily treatment. In 40 verification tests, geometrical errors were never more than 1 mm.
Keywords:stereotaxic surgery   computer assisted tomography   linear accelerator
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