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Table 2 Mean absolute dose parameters of different anal sphincters in rectal cancer patients treated with IMRT or 3D-radiation technique

From: Impact of VMAT-IMRT compared to 3D conformal radiotherapy on anal sphincter dose distribution in neoadjuvant chemoradiation of rectal cancer

  D98% D2% Dmean Dmedian
Anal Sphincter (Gy)
 IMRT 22,7 45,8 34,3 35,3
 3D 31,4 46,2 43,3 45,0
 p-value 0,009 0,007 0,004 0,009
Internal Anal Sphincter (Gy)
 IMRT 23,9 40,2 30,9 29,7
 3D 35,3 45,8 43,2 44,5
 p-value 0,004 0,007 0,004 0,009
External Anal Sphincter (Gy)
 IMRT 22,6 40,3 30,5 29,3
 3D 30,1 45,5 40,6 42,0
 p-value 0,005 0,007 0,009 0,010
Levator Ani (Gy)
 IMRT 36,6 46,9 44,5 45,9
 3D 41,7 46,5 45,5 45,5
 p-value 0,000 0,005 0,008 0,005
  1. IMRT Intensity modulated radiation therapy, 3D 3D-conformal radiation therapy, Gy Gray
  2. boldfaced p-values are statistically significant