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Table 2 Advocated safety margins

From: Stereotactic body radiation therapy for abdominal oligometastases: a biological and clinical review

Team Metastases Recommendation
Schefter et al. 2005 [20] SBRT of liver metastases Minimum distance between GTV and PTV surfaces:
   — 0.5 cm, axial planes
   — 1.0 cm, superior/inferior
   Cumulative maximum tumourdiameter: < 6 cm
Katria et al. 2010 [21] IGRT of abdomen and pelvis Stroom's and Van Herk's margins (cm):
   — 0.39 and 0.35 mm, anterior-posterior
   — 0.94 and 0.46 mm, medial-lateral
   — 0.40 and 1.09 mm, superior-inferior
Wysocka et al. 2010 [22]   Median 3.8 mm intrafraction craniocaudal displacement for coeliac axis with smaller displacements for other axes
RTOG consensus guidelines [23] Inguinal lymph nodes Caudad extent of the inguinal region : 2 cm to the saphenous/femoral junction
Kim et al. 2011 [24] Inguinal and femoral nodes 2.2 - 2.9 cm around femoral vessels
Van Weieringen et al. 2011 [25] Pelvic lymph nodes For offline and online correction protocols, respectively:
   — 7 and 5 mm, left-right
   — 6 and 5 mm,craniocaudal
   — 8 and 7 mm,dorsoventral
  1. RTOG: Radiation Therapy Oncology Group.