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Table 1 Comparison of measured and calculated Hounsfield look-up table points

From: Range accuracy in carbon ion treatment planning based on CT-calibration with real tissue samples

 

CT scanner 1

CT scanner 2

 

HU

WEPL

ΔWEPL

HU

WEPL

ΔWEPL

fat

-73.9 ± 20.8

0.978

-0.1 %

-97.9 ± 45.6

0.978

-2.6 %

 

-72.7 ± 21.2

0.978

-0.0 %

-109.3 ± 43.6

0.960

-1.9 %

 

-73.9 ± 27.6

0.980

-0.3 %

-102.6 ± 44.4

0.972

-2.5 %

brain

45.0 ± 17.4

1.044

-0.0 %

47.4 ± 16.0

1.042

0.3 %

 

40.9 ± 15.0

1.054

-1.1 %

38.7 ± 18.6

1.041

-0.0 %

 

44.0 ± 16.4

1.040

0.4 %

   

kidney

53.1 ± 26.9

1.046

-0.0 %

49.0 ± 20.7

1.048

-0.2 %

 

66.0 ± 15.8

1.041

2.1 %

54.0 ± 15.6

1.048

0.1 %

 

57.5 ± 26.6

1.045

0.7 %

   

liver

83.3 ± 20.5

1.059

0.8 %

75.5 ± 20.1

1.063

0.3 %

 

79.7 ± 19.0

1.059

0.7 %

74.4 ± 27.6

1.064

0.2 %

 

81.3 ± 13.7

1.061

0.6 %

72.9 ± 21.3

1.064

0.2 %

leg

65.5 ± 18.8

1.053

1.0 %

   
 

66.9 ± 23.6

1.072

-0.7 %

   
 

65.4 ± 19.6

1.049

1.3 %

   

neck

66.0 ± 25.8

1.036

2.6 %

   
 

50.0 ± 47.5

1.043

0.4 %

   

filet

73.3 ± 16.2

1.049

1.6 %

   
 

63.6 ± 25.5

1.049

1.1 %

   
 

69.5 ± 22.6

1.049

1.6 %

   
  1. HLUT measurements with two different CT scanners for fat, brain, kidney, and liver and additional measurements for various muscle tissues with CT scanner 1. Different samples of the same tissue type were used for measurements with CT scanner 1 and 2. To compare with measured data, relative differences in water equivalence in comparison to predictions based on the current HLUT are presented, positive numbers would result in over-ranges and negative values in under-ranges.
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