Dose Course 2018_Flipping book

Tissue and Phantom Material Characterization -as used in Oncentra MP-

Composition

H





H

mass

elec

DCM





mass,H O

elec,H O

2

2

Air (outside patient)

0.00121

0.00109

-992

-128

0.00121 • how many linear segments should be used? • which tissue-equivalent materials are suitable for calibration? • where should the boundaries between tissue types be set? ……… 0.00109 -976 0.50 0.50 -480 0.95 0.95 -96 1.05 1.04 48 1.10 1.08 128

Air (inside patient)

-127

Lung (ICRU 44)

-96

Adipose (ICRU 44)

-72

Muscle (ICRU 44)

-63

Cartilage (ICRP 23)

-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”

Quality of conversion affects dose calculation - one of the weakest links in the calculation chain!