Table 1.

Examples of regimens frequently used in the U.S. for tandem and ovoid or tandem and ring brachytherapy.

EBRT, dose to ICRU 52 point or median dose in case of IMRT	Fractionation to point A (Gy)	EQD2 (Gy) to the tumor (point A dose with α/β=10 Gy)*	EQD2 (Gy) with 90% of the target dose to the OAR using α/β =3 Gy)	EQD2 (Gy) with 70% of the target dose to the OAR using α/β =3 Gy)
25 × 1.8 Gy	4 × 7 Gy	83.9	90.1	74.2
25 × 1.8 Gy	5 × 6 Gy	84.3	88.6	73.4
25 × 1.8 Gy	6 × 5 Gy	81.8	83.7	70.5
25 × 1.8 Gy	5 × 5.5 Gy	79.8	82.6	69.6

^*For institutions that use radiographic imaging for treatment planning, these doses (e.g. D90) are recorded at point A. For institutions that utilize CT or MRI, these doses are recorded covering the target volume or HR-CTV.