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Composition

2

mass

mass,H O

2

elec

elec,H O

H

DCM

H

Air (outside patient)

0.00121

0.00109

-992

-128

Air (inside patient)

0.00121

0.00109

-976

-127

Lung (ICRU 44)

0.50

0.50

-480

-96

Adipose (ICRU 44)

0.95

0.95

-96

-72

Muscle (ICRU 44)

1.05

1.04

48

-63

Cartilage (ICRP 23)

1.10

1.08

128

-58

2/3 Cartilage, 1/3 Bone

1.35

1.29

528

-33

1/3 Cartilage, 2/3 Bone

1.60

1.52

976

-5

Bone (ICRP 23)

1.85

1.72

1488

27

Bone (ICRP 23)

2.10

1.95

1824

48

½ Bone, ½ Aluminum

2.40

2.15

2224

73

Aluminum

2.70

2.34

2640

99

Aluminum

2.83

2.46

2832

111

Iron

7.87

6.60

>2832

112

Water

1.00

1.00

-

“127”

Tissue and Phantom Material Characterization

-as used in Oncentra MP-

• how many linear segments should be used?

• which tissue-equivalent materials are suitable for calibration?

• where should the boundaries between tissue types be set?

………

Quality of conversion affects dose calculation

- one of the weakest links in the calculation chain!