Fig. 2
From: Vaginal dose of radical radiotherapy for cervical cancer in China: a multicenter study
BT CT sagittal view for a patient with tandem and ovoid applicator. The picture shows three cases of BT planning for three patients with different VRLs. a: Patient with a VRL of 6.8 cm. b: Patient with a median VRL of 4.5 cm. c: Patient with a VRL of 3.5 cm, in whom the PIBS+ 2 cm point was located in the high dose area. Red contour: the 150% isodose line. Green contour: the 100% isodose line. Red dashes: level of PIBS points. Yellow dot: PIBS+ 2 cm point. With a shorter VRL, the PIBS+ 2 cm point becomes closer to the vaginal applicator. Definition of the PIBS+ 2 cm is not applicable anymore