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.
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.
Division of Radiation Oncology, National Defense Medical College, Tokorozawa, Saitama, Japan.
M
M
Uematsu
M
M
Sonderegger
A
A
Shioda
K
K
Tahara
T
T
Fukui
Y
Y
Hama
T
T
Kojima
J R
JR
Wong
S
S
Kusano
D001932:Brain Neoplasms / Q000532:radiotherapy; D019583:Dose Fractionation, Radiation; D006257:Head / Q000033:anatomy & histology; D006801:Humans; D019047:Phantoms, Imaging; D016634:Radiosurgery / Q000295:instrumentation*; D011880:Radiotherapy Planning, Computer-Assisted; D020266:Radiotherapy, Conformal / Q000379:methods*; D013238:Stereotaxic Techniques / Q000295:instrumentation; D014057:Tomography, X-Ray Computed / Q000295:instrumentation