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Table B.25: Red bone marrow in the whole body - Helmholtz ...

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102<br />

<strong>Table</strong> D. 6: Colon (descend<strong>in</strong>g and sigmoid)<br />

Mean organ dose normalised to air kerma free <strong>in</strong> air on <strong>the</strong> axis of rotation<br />

and average coefficients of variance per s<strong>in</strong>gle 1 cm wide slice; <strong>the</strong> volume<br />

ratio of <strong>the</strong> organ located with<strong>in</strong> each s<strong>in</strong>gle slice is also shown.<br />

Slice Volume Conversion factors Coeff.<br />

ratio<br />

of var.<br />

80 kV 125 kV<br />

cm % 360° 180° 360° 180° %<br />

16 to 17 * * * .0001 15.24<br />

17 to 18 * * * .0001 15.29<br />

18 to 19 * * * * 16.96<br />

19 to 20 * * .0001 .0001 16.05<br />

20 to 21 * .0001 .0001 .0001 17.51<br />

21 to 22 .0001 .0001 .0001 .0001 12.78<br />

22 to 23 .0001 .0001 .0002 .0002 14.71<br />

23 to 24 .0001 .0002 .0003 .0003 12.27<br />

24 to 25 .0002 .0002 .0003 .0003 12.13<br />

25 to 26 .0002 .0002 .0004 .0004 11.39<br />

26 to 27 .0002 .0003 .0005 .0005 10.04<br />

27 to 28 .0002 .0003 .0004 .0005 9.38<br />

28 to 29 .0004 .0004 .0008 .0007 8.11<br />

29 to 30 .0005 .0005 .0009 .0009 7.18<br />

30 to 31 .0006 .0007 .0009 .0010 6.59<br />

31 to 32 .0007 .0007 .0012 .0013 5.85<br />

32 to 33 .0009 .0011 .0016 .0016 5.24<br />

33 to 34 .0012 .0013 .0022 .0021 4.54<br />

34 to 35 .0016 .0019 .0027 .0029 3.96<br />

35 to 36 .0023 .0025 .0035 .0037 3.47<br />

36 to 37 .0028 .0035 .0044 .0049 3.04<br />

37 to 38 .0040 .0046 .0054 .0062 2.71<br />

38 to 39 .0051 .0060 .0073 .0080 2.36<br />

39 to 40 .0071 .0087 .0100 .0110 2.03<br />

40 to 41 .0106 .0117 .0137 .0147 1.77<br />

41 to 42 1.5 .0183 .0234 .0230 .0274 1.38<br />

42 to 43 5.4 .0337 .0442 .0403 .0500 1.09<br />

43 to 44 9.0 .0488 .0597 .0574 .0683 0.95<br />

44 to 45 5.1 .0414 .0494 .0489 .0568 1.01<br />

45 to 46 5.2 .0434 .0490 .0503 .0567 1.00<br />

46 to 47 5.8 .0455 .0532 .0534 .0625 0.97<br />

47 to 48 6.8 .0484 .0594 .0585 .0683 0.94<br />

48 to 49 6.4 .0454 .0579 .0553 .0674 0.95<br />

49 to 50 6.3 .0432 .0563 .0524 .0669 0.96

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