Dear Junyu,
Consider a Cartesian USRBIN. For any scored quantity f_ijk, where i
j k are the respective bin indices along X Y and Z, a 2D projection
(e.g. on X and Y) should be interpreted in this context as
f_ij = (sum_k f_ijk * dZ) / (Z_max-Z_min),
where dZ is the bin width along Z and the sum runs over all bins in
[Z_min,Z_max]. Note that this actually performs an average. The length
units of dZ and Z_{min,max} cancel out: the virtue of this is that the
physical units of f_ij are those of f_ijk, which is convenient.
In an analogous way, for a 1D projection along, say X, one has:
f_i = (sum_jk f_ijk * dY * dZ) / ((Y_max-Y_min) * (Z_max-Z_min)),
where dY is the bin width along Y and the sum runs over all bins along
[Y_min,Y_max] and [Z_min,Z_max].
Thus, in your 1D plots each datapoint is the average value over the
perpendicular plane (bound by the USRBIN limits). I have not seen your
input, but there could be large regions of your USRBIN with ~zero dose,
which shrink the average value, and could easily justify the values you
see in your 1D plots.
Hope this helps (and is not too far off!),
Cesc
On Thu, Aug 16 2018, at 11:38 +0800, 张俊昱 wrote:
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>Dear FLUKA experts:
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>I try to simulate dose distribution from a plan generated by TPS. If I compare the RTDose and FLUKA dose in Dicom RTViewer in flair, the dose value seems OK (DoseInRTViewer.png).
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>But if I try to plot the bnn file in plot of flair, then the dose value seems reduced in the 1-D plots (*-1D.png).
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>How should I understand the dose value in 1D plot, is it still with a default unit?
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>I have already tune the USRBIN dose weight with a 1.602E+7 and total particle number recorded in treatment plan in Comscw.f subroutine.
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>Thanks in advance.
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>Best,
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>Junyu
--
Francesc Salvat Pujol
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
Tel: +41 22 76 64011
Fax: +41 22 76 69474
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Received on Thu Aug 16 2018 - 17:10:22 CEST