9 Reporting in Brachytherapy: Dose and Volume Specification

Reporting in Brachytherapy 193

Fig 6.20 in summary shows in detail the essential parameters for reporting intraluminal brachytherapy with concentric source and applicator position. Typical situations for endovascular (Fig 19A) bronchial (Fig 19B) and oesophagael (Fig 19 C-E) as well as typical intravaginal applications are shown (Fig 19 F – H). For the oesophagus and the vagina differences in the prescribed depth are illustrated. For the oesophagus three difference applicator diameters are compared. 7.6 Recommendations for reporting intraluminal brachytherapy – Summary It is recommended reporting the following data in intraluminal brachytherapy (a) : * Complete description of the clinical conditions (see section 2 and 7.3, p. 183) * Description of the technique including the applicator dimensions (see section 3, p. 163) * Full time-dose pattern (see section 5, p. 168) * Treatment prescription (see section 1.1, p. 155) * Specification of the sources (see section 4, p. 165) * Dose specification at 3 different depths in the organs, within the patient : ►dose at the surface/mucosa (b) ►Minimum Target Dose (b) ►dose at reference depth from the surface (b) * Dimensions of volumes : (a) Levels for reporting endovascular brachytherapy Although the different levels for reporting are not yet definitely established, the following criteria are recommended. Reporting at level 1 is based, in principle, on information derived from 2 radiographic projections. As a rule, reporting at level 2 should include all volumes, dimensions and doses reported at level 1, but for many of them, with a more accurate evaluation. In addition, information derived from CT, MRI and intravascular ultrasound sections should also be reported. (b) for non-centered catheters, the maximum and minimum values and mean values must be reported. (c) in particular, GTV, CTV, PTV, reference and Treated Volume, and relation to the active source length (see 6.3.1). In addition, for endovascular brachytherapy, lesion length, interventional length. (d) in the central plane and its variation along the lumen axis if significant. ►length (c) ►depth (d)