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. 2016 May-Jun;49(3):170–175. doi: 10.1590/0100-3984.2015.0003

Table 2.

Comparison of the delineated volumes of the internal mammary lymph nodes and the dosimetric parameters between the 2D RT technique (performed at a public facility) and the 3D RT technique (performed at a private facility).

  2D   3D  
Parameter Median (min–max) Mean (SD)   Median (min–max) Mean (SD) P
IMLN volume (mL) 6.8 (5–8.1) 6.8 (0.82)   5.7 (4.4–8.0) 5.9 (0.97) 0.411
V45 (%) 0 (0–27) 2.2 (5.6)   7.5 (0–96) 15.8 (23.5) 0.020
D95 (cGy) 196.6 (44–742) 228.1 (136.6)   533.5 (242–4609) 753 (766) < 0.0001
Dmin (cGy) 181.4 (37–369) 1790 (80.2)   470 (220–4414) 639.5 (708) < 0.0001
Dmax (cGy) 354.3 (108–5358) 2827.7 (1981.5)   5034 (756–5541) 4198.3 (1499) < 0.0001
Dmean (cGy) 508.25 (70–3245) 793.5 (772.6)   1811.5 (438–5295) 2064.2 (1331) < 0.0001
V25 (%) 0.35 (0–53.7) 7.8 (13.8)   27.6 (0–99.6) 31.9 (29.8) < 0.0001
D50 (cGy) 350.8 (73–3430) 619.7 (738.9)   1193 (50-5332) 1746.7 (1459.5) < 0.0001

IMLN, Internal mammary lymph nodes; V45, proportion of the volume receiving at least 45 Gy; D95, dose to 95% of the volume; Dmin, minimum dose; Dmax, maximum dose; Dmean, mean dose; V25, proportion of the volume receiving at least 25Gy; D50, dose to 50% of the volume; SD, standard deviation.