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

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30<br />

<strong>Table</strong> B. 3: Bra<strong>in</strong><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 />

0 to 1 2.4 .0276 .0287 .0314 .0322 0.34<br />

1 to 2 8.1 .0685 .0711 .0795 .0813 0.23<br />

2 to 3 13.7 .1015 .1028 .1178 .1195 0.19<br />

3 to 4 16.9 .1190 .1204 .1396 .1412 0.17<br />

4 to 5 18.1 .1243 .1249 .1462 .1467 0.17<br />

5 to 6 17.1 .1155 .1149 .1361 .1361 0.17<br />

6 to 7 12.4 .0886 .0838 .1051 .1009 0.20<br />

7 to 8 7.5 .0593 .0550 .0709 .0667 0.24<br />

8 to 9 3.3 .0319 .0289 .0398 .0369 0.31<br />

9 to 10 0.4 .0140 .0128 .0181 .0170 0.45<br />

10 to 11 .0084 .0082 .0108 .0108 0.57<br />

11 to 12 .0054 .0052 .0071 .0071 0.71<br />

12 to 13 .0038 .0038 .0051 .0052 0.84<br />

13 to 14 .0027 .0027 .0037 .0037 0.99<br />

14 to 15 .0021 .0022 .0030 .0030 1.09<br />

15 to 16 .0016 .0017 .0024 .0024 1.24<br />

16 to 17 .0012 .0013 .0018 .0019 1.41<br />

17 to 18 .0009 .0010 .0014 .0015 1.62<br />

18 to 19 .0007 .0007 .0011 .0011 1.85<br />

19 to 20 .0005 .0005 .0008 .0008 2.11<br />

20 to 21 .0003 .0004 .0006 .0006 2.54<br />

21 to 22 .0003 .0003 .0005 .0005 2.88<br />

22 to 23 .0002 .0002 .0004 .0004 3.08<br />

23 to 24 .0002 .0002 .0003 .0003 3.43<br />

24 to 25 .0002 .0002 .0003 .0003 3.83<br />

25 to 26 .0001 .0001 .0002 .0002 4.33<br />

26 to 27 .0001 .0001 .0002 .0002 4.90<br />

27 to 28 .0001 .0001 .0001 .0001 5.56<br />

28 to 29 .0001 .0001 .0001 .0001 6.34<br />

29 to 30 * * .0001 .0001 7.21<br />

30 to 31 * * .0001 .0001 8.35<br />

An asterisk as table entry means that <strong>the</strong> conversion factor is less than 0.00005.

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