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Table 1 The old delineation method for para-aortic area in prophylactic EFRT [9]

From: Reduction of dose to duodenum with a refined delineation method of Para-aortic region in patients with locally advanced cervical Cancer receiving prophylactic extended-field radiotherapy

Steps

Methods

1

Contour the inferior vena cava and aorta

2

The superior extent should be the at the L1/L2 space

3

The inferior extent should be the level of the bifurcation of the aorta.

4

Expand the aorta by a margin of 10 mm anteriorly, posteriorly and medially, and 15 mm laterally.

5

Expand the inferior vena cava by 8 mm anteriorly and medially, and 6 mm posteriorly and laterally.

6

Combine the aorta and inferior vena cava expansions to create a clinical target volume.

7

Crop the clinical target volume form normal boundaries such as the vertebral body, muscle and bowl and expand the posterior border to the anterior vertebral body.

  1. Abbreviations: EFRT extended-field radiotherapy