Head-And-Neck(66Gy/33#)
Grid Sizes(mm)
OrgansAt Risk 3.0 5.0 10.0
  D1cc(Gy) Dmax(Gy) Mean Dose(Gy) D1cc(Gy) Dmax(Gy) Mean Dose(Gy) D1cc(Gy) Dmax(Gy) Mean Dose(Gy)
Spinal Cord
Case1
Case2
Case3
Case4
 
40.18
44.26
40.72
43.19
 
 
43.50
46.84
43.19
46.05
 
 
 
     
43.24
45.59
44.87
42.54
     
44.93
46.18
45.11
44.89
 
 
42.16
46.45
45.11
41.56
 
Spinal cord PRV
Case1
Case2
Case3
Case4
 
47.59
48.22
48.14
48.42
 
49.72
50.89
49.69
51.72
     
48.84
47.01
48.97
49.98
     
49.42
48.48
51.81
48.76
 
47.01
46.53
47.33
47.50
 
  Brain Stem
Case1
Case2
Case3
Case4
 
 
 
    40.40
32.83
51.66
45.31
 
47.07
38.32
53.95
49.68
       
39.60
32.90
52.77
45.38
     
44.00
36.78
54.86
50.42
 
     
44.77
33.06
53.44
49.50
 
46.91
35.02
54.76
49.88
 
Brain Stem PRV
Case1
Case2
Case3
Case4
 
47.42
36.40
55.65
55.15
 
56.24
40.53
59.58
55.15
     
52.40
40.16
59.87
56.21
     
49.86
36.57
56.35
59.26
 
53.84
36.48
57.10
59.26
 
Parotid
Case1
Case2
Case3
Case4
     
35.42
35.42
33.40
34.50
     
34.49
34.50
34.50
38.83
     
31.97
32.50
35.00
40.00
(a)
Pelvis(Carcinoma Cervix)[50Gy/25#]
Grid Sizes(mm)
Organs At Risk                3.0                5.0                10.0
  D1cc (Gy) Dmax (Gy) Mean Dose (Gy) D1cc (Gy) Dmax (Gy) Mean Dose (Gy) D1cc (Gy) Dmax (Gy) Mean Dose (Gy)
   Bladder
Case1
Case2
Case3
Case4
 
50.94
50.50
51.82
49.85
 
 
51.29
51.00
52.09
50.25
 
 
 
 
51.70
50.57
51.18
50.51
 
 
52.02
50.94
51.71
50.83
 
     
52.04
51.58
52.84
50.64
   
 
52.04
51.56
52.94
50.68
 
 
  Rectum
Case1
Case2
Case3
Case4
 
52.14
50.15
52.38
50.98
 
52.63
50.99
52.62
51.54
 
 
52.71
50.79
51.40
51.35
 
53.10
51.62
51.90
51.67
 
   
52.75
50.88
52.78
51.48
 
 
53.05
50.92
52.68
51.59
 
 
 
   Rt.FH
Case1
Case2
Case3
Case4
 
         
44.53
50.55
50.82
46.96
           
44.64
50.86
49.21
46.01
 
         
45.13
50.12
47.08
41.5
 
    Lt.FH
Case1
 Case2
 Case3
 Case4
   
44.59
51.15
51.60
48.01
     
44.56
50.75
50.64
45.26
     
45.70
53.62
51.18
43.56
 
   Bowel D195cc(Gy) Dmax (Gy) Mean Dose (Gy) D195cc(Gy) Dmax(Gy) Mean Dose (Gy)   D195cc(Gy) Dmax (Gy) Mean Dose (Gy)
Case1
Case2
Case3
Case4
41.62
39.77
45.29
42.47
53.47
53.65
53.48
53.37
 
41.93
39.30
45.04
42.34
52.74
53.56
52.49
53.85
 
41.73
39.62
46.17
42.99
51.73
53.62
53.41
52.19
 
(b)
    Brain(54Gy/27#)
Grid Size (mm)
Organs at Risk 3     5     10    
  D1cc (Gy)   Dmax (GY)   Mean Dose(GY) D1cc (Gy)   Dmax (GY)   Mean Dose(GY) D1cc (Gy)   Dmax(GY)   Mean Dose(GY)
optic chiasm                  
Case1 20.11 29.32   21.13 26.98   21.57 28.36  
Case2 53.0 53.82    51.39    55.21    51.39 53.69  
Case3 51.21 55.23   51.39 55.21   51.48 55.33  
Case4 35.66 49.65   35.74 46.96   35.07        46.96  
Optic chiasm PRV                  
Case1 26.62 35.16   27.03 34.37   26.97 30.11  
Case2 53.69 55.64   55.61 57.68   53.69 57.18  
Case3 55.25 56.57   55.66 56.34   55.39 55.78  
Case4 47.36 53.10   46.97 51.87   47.88 47.50  
BRAIN STEM                  
CASE1 52.17 53.36   53.28 54.76   53.23 54.75  
CASE2 52.78 59.10   54.23 55.88   55.81 56.95  
CASE3 35.75 37.28   36.02 37.23   16.77 37.04  
CASE4 54.00 54.68   53.59 53.98   54.69 55.19  
BRAIN STEMPRV                  
CASE1 53.92 55.35   54.82 55.93   53.75 55.75  
CASE2 54.61 55.90   55.35 55.96   56.63 58.45  
CASE3 50.16 52.15   50.63 51.62   50.97 51.79  
CASE4 54.12 54.77   53.77 54.21   54.92 55.19  
Rt.Eye                  
Case1   6.27 4.81   7.83 5.66   6.56 5.06
Case2   31.08 14.39   28.34 14.32   14.04 26.9
Case3   40.29 22.46   38.33 21.96   34.15 22.4
Case4   22.64 7.27   22.44 7.31   19.78 7.31
Lt.Eye                  
Case1   17.18 15.10   17.93 15.8   17.98 16.28
Case2   44.60 19.34   42.28 19.66   38.91 15.93
Case3   40.09 20.17   38.81 19.79   33.05 19.89
Case4   15.06 4.50   14.88 4.40   14.08 4.40
(c)
Table 2: (a), (b) & (c) summarizes dose distribution changes on OAR with varying grid sizes for different sites viz. Head and Neck, Pelvis, Brain, which showed some significant variation between planning CT.