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Table 4 Comparisons of the DVH-based parameters of OARs in the present study (n = 10).

From: Dosimetric comparison using different multileaf collimeters in intensity-modulated radiotherapy for upper thoracic esophageal cancer

DVH-based parameters MLC leaf width
(mm)
mean ± SD p value
Spinal cord    
   Dmax (cGy) 10 4288.5 ± 333.9 0.20
  4 4159.1 ± 422.5  
   D5 (cGy) 10 3404.5 ± 374.4 0.021
  4 3260.3 ± 374.0  
   gEUD (cGy) 10 1849.2 ± 297.6 0.049
  4 1815.1 ± 281.7  
Total lungs    
   V5 (%) 10 43.2 ± 6.9 0.48
  4 42.9 ± 6.6  
   V10 (%) 10 34.0 ± 6.7 0.004
  4 33.2 ± 6.5  
   V20 (%) 10 16.6 ± 4.7 0.004
  4 16.0 ± 4.6  
   V30 (%) 10 5.8 ± 2.3 0.09
  4 5.4 ± 2.0  
   MLD (cGy) 10 887.9 ± 172.1 0.005
  4 866.2 ± 174.1  
   gEUD (cGy) 10 956.8 ± 171.0 0.017
  938.6 ± 175.2   
  1. DVH: dose volume histogram; OARs: organs at risk; MLC: multileaf collimator; Dmean and Dmax: average and maximum irradiation dose; D5: irradiation dose received by the 5% of volume of OAR; gEUD: generalized equivalent uniform dose; V5,10,20,30: the volume of total lungs receiving the dose of 5, 10, 20 and 30 Gy respectively; MLD: mean lung dose.