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Figure 2: (a and b) Represents the perspective views of anterior field of three-dimensional conformal radiotherapy treatment to the pelvic site of a patient under linac, showing the transverse and coronal planes containing (a) the treatment isocenter for estimation of transit mid-plane dose (Diso,transit) through transit signal obtained from FC65 chamber with buildup cap, which was kept at EPID level, and (b) the location of CC13 chamber (with protective cap) in vaginal cavity for measurement of “Din vivo”. Both the measurements were done simultaneously with chambers during real-time treatment delivery, for all four conformal fields (0°, 90°, 180°, and 270°) on at least 3–5 occasions (after having taken the repeat computerized tomography) during the course of treatment. Chambers' signals were measured with “Dose2” dual channel electrometer. The lower right side of the figure represents the patient orientation icon for treatment

Figure 2: (a and b) Represents the perspective views of anterior field of three-dimensional conformal radiotherapy treatment to the pelvic site of a patient under linac, showing the transverse and coronal planes containing (a) the treatment isocenter for estimation of transit mid-plane dose (D<sub>iso,</sub><sub>transit</sub>) through transit signal obtained from FC65 chamber with buildup cap, which was kept at EPID level, and (b) the location of CC13 chamber (with protective cap) in vaginal cavity for measurement of “D<sub>in vivo</sub>”. Both the measurements were done simultaneously with chambers during real-time treatment delivery, for all four conformal fields (0°, 90°, 180°, and 270°) on at least 3–5 occasions (after having taken the repeat computerized tomography) during the course of treatment. Chambers' signals were measured with “Dose<sup>2”</sup> dual channel electrometer. The lower right side of the figure represents the patient orientation icon for treatment