Relative sensitivities of various detectors covered with 0, 5, and 15 mm bolus material (b) at different off-axis distances from the center of a 10 × 10 cm 6 MV x-ray beam. Adapted from Ref. 90 .
Dosimetry reports of the in vivo EPID dosimetry verification (upper part) and phantom measurement (bottom part) of a stereotactic VMAT treatment of a lung cancer patient using two arcs. Indicated are the γ-evaluations of the EPID-reconstructed and planned dose distributions in three orthogonal planes. The yellow and red color indicate regions where the EPID dose is higher than the plan, while the green and blue color indicate regions where the EPID dose is equal or lower than the plan. The 50% isodose line is shown in black. The red dot in the upper dosimetry report indicates that at least one of the evaluation criteria is outside the action level, while the green dot in the lower figure indicates that all evaluation criteria are met.
Axial views for a patient with clival chordoma receiving a posterior–anterior oblique proton field followed by a lateral oblique field at 1 GyE/field, imaged with a delay of 20 and 13 min, respectively. (Top) Treatment-planning (TP) dose (left) and measured (Meas) positron emission tomography (right). (Bottom) Monte Carlo (MC) dose (left) and MC positron emission tomography (right). Range of color wash display is from blue (minimum) to red (maximum). Adapted from Ref. 117 .
Comparison of a normalized (a) relative dose distribution delivered to a patient, and (b) prompt gamma-ray production in the same patient during irradiation with a single lateral incident 250 MeV proton beam. Adapted from Ref. 127 . The colors in (a) indicate isodose lines, while the gamma-ray production in (b) was originally expressed as number of prompt gamma rays produced/incident proton, but these data have been normalized to obtain the isolines shown.
Summary of characteristics of detectors used for external beam in vivo dosimetry, given as the dependence of the detector sensitivity on a specific parameter. a,b
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