Dosimetric characteristics of a 6 MV photon beam from a linear accelerator with asymmetric collimator jaws.
Dosimetric measurements have been made of a 6 MV photon beam from a linear accelerator equipped with asymmetric jaws. The field size factors for asymmetrically set fields are compared to those for symmetrically set fields. The change of beam quality has been measured as a function of off-axis position of the asymmetric fields to assess its effect on depth dose. Additional measurements include beam penumbra and shape of isodose curves for open and wedge fields as the field opening is moved asymmetrically from the central ray.
Palta
J R
JR
Thomas Jefferson University Hospital, Department of Radiation Therapy and Nuclear Medicine, Philadelphia, PA 19107.
Ayyangar
K M
KM
Suntharalingam
N
N
D010315:Particle Accelerators; D011827:Radiation; D011829:Radiation Dosage; D013679:Technology, Radiologic