<div dir="ltr"><br><div style>yes, but only 4 values [10;5], [5;0], [0;-5] and [-5;-10]. </div><div style><br></div><div style>The SetPosition could be used to move the actor inside the attached volume (waterbox in your case), in the coordinate system of the waterbox. So if you set position to "0 0 5" for example, you will still have 4 dosels (dose in volume) : [15;10] [10;5], [5;0], and [0;-5]. But the first one is thus outside the volume so no dose deposition will be stored in the first dosel. </div>
<div style><br></div><div style>Note that if you are saving the dose actor in mhd image file format, the "origin" of the image is updated according this position. </div><div style><br></div><div style>David</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, May 15, 2013 at 4:30 AM, 刘斌信件 <span dir="ltr"><<a href="mailto:golder_time@163.com" target="_blank">golder_time@163.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<u></u>
<div bgcolor="#ffffff">
<div><font face="宋体">Hi david ,</font></div>
<div><font face="宋体"> </font></div>
<div><font face="宋体"> What is the relationship
between Doseactor and setPostion ,do the "setPostion " set the origin of
the scored dose voxel ? As the following is an example,</font></div>
<div><font face="宋体"></font> </div>
<div><font face="宋体">
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'"><font size="3">/gate/world/daughters/name
WaterBox<u></u><u></u><u></u></font></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'"><font size="3">/gate/world/daughters/insert
box<u></u><u></u></font></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'"><font size="3">/gate/WaterBox/setMaterial
Water<u></u><u></u></font></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'"><font size="3">/gate/WaterBox/geometry/setXLength 20 mm<u></u><u></u></font></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'"><font size="3">/gate/WaterBox/geometry/setYLength 20 mm<u></u><u></u></font></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'"><font size="3">/gate/WaterBox/geometry/setZLength 20 mm<u></u><u></u></font></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'"><font size="3">/gate/WaterBox/placement/setTranslation 0.0 0.0 0.0
mm<u></u><u></u></font></span></p></font></div>
<div> </div>
<div>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'">/gate/actor/addActor<span>
</span>DoseActor dose<u></u><u></u></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'">/gate/actor/dose/attachTo<span> </span><span> </span>WaterBox<u></u><u></u></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'">/gate/actor/dose/setPosition<span>
</span>0 0 0 mm<u></u><u></u></span></p>
<p style="MARGIN:0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY:'Courier New'">/gate/actor/dose/setSize<span>
</span>5 5 20 mm<u></u><u></u></span></p><span lang="EN-US" style="FONT-SIZE:10.5pt;FONT-FAMILY:'Courier New'">/gate/actor/dose/setVoxelSize <span> </span>5 5 5
mm </span></div>
<div><font face="宋体"> </font></div>
<div><font face="宋体">as above , in my view , the actor will gets five dose
points , their z-axis coordinates are<font size="3"> <span>10 ,5, 0, -5,-10, is that right? The "setpostion " is used to set
the symmetrical center of the volume of detected by doseactor
.</span></font></font></div>
<div><font face="宋体"><font size="3"><span></span></font></font> </div>
<div><font face="宋体"><font size="3"><span>Thank you so
much</span></font></font></div>
<div><font face="宋体"><font size="3"><span></span></font></font> </div>
<div><font face="宋体"><font size="3"><span>Yours
sincerely</span></font></font></div>
<div><font face="宋体"><font size="3"><span></span></font></font> </div>
<div><font face="宋体"><font size="3"><span>Bin.</span></font></font></div>
<div><font face="宋体"></font> </div>
<blockquote dir="ltr" style="PADDING-RIGHT:0px;PADDING-LEFT:5px;MARGIN-LEFT:5px;BORDER-LEFT:#000000 2px solid;MARGIN-RIGHT:0px"><div class="im">
<div style="FONT:9pt 宋体">----- Original Message ----- </div>
<div style="BACKGROUND:#e4e4e4;FONT:9pt 宋体"><b>From:</b>
<a title="David.Sarrut@creatis.insa-lyon.fr" href="mailto:David.Sarrut@creatis.insa-lyon.fr" target="_blank">David Sarrut</a> </div>
<div style="FONT:9pt 宋体"><b>To:</b> <a title="golder_time@163.com" href="mailto:golder_time@163.com" target="_blank">刘斌信件</a> </div>
</div><div><div class="h5"><div style="FONT:9pt 宋体"><b>Sent:</b> Friday, May 10, 2013 6:58 PM</div>
<div style="FONT:9pt 宋体"><b>Subject:</b> Re: [Gate-users] how to set MU
prescription dose lines</div>
<div><br></div>
<div dir="ltr">this is classical "variance reduction technique" that consists in
producing n photons (instead of a single one), each of them with a relative
weight of 1/n. It means that such photons behave like 1/n part of
photon.
<div><br></div>
<div>Look for articles/chapter on "variance reduction technique"</div>
<div><br></div>
<div>Sincerely, </div>
<div>David</div></div>
<div class="gmail_extra"><br><br>
<div class="gmail_quote">On Fri, May 10, 2013 at 10:42 AM, 刘斌信件 <span dir="ltr"><<a href="mailto:golder_time@163.com" target="_blank">golder_time@163.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid"><u></u>
<div bgcolor="#ffffff">
<div><font face="宋体">Hi,</font></div>
<div><font face="宋体"></font> </div>
<div><font face="宋体"> I'm sorry that I yet can't
understand clearly the "weight" and "the splitting
factor n ", the following are the part of the text in the paper
:</font></div>
<div><font face="宋体"></font> </div>
<div><font face="宋体" color="#0000ff">When a primary electron hit the target and
produce a bremsstrahlung photon, the SBS tool sampled n photons at once,
with a weight of 1/n each, all having the same energy and starting from the
electron hit point in the target, only the photon direction was sampled,
according to the direction criterion. User can define the splitting factor
n, as well as the direction criterion.</font></div>
<div><font face="宋体" color="#0000ff"></font> </div>
<div><font face="宋体"> What is meaning of the setence "<font color="#0000ff">the SBS tool sampled n photons at once, with a weight of 1/n
each"<font color="#000000">?</font> </font></font><font face="宋体">Thank you very
much .</font></div>
<div><font face="宋体">yours sincerely, </font></div>
<div><font face="宋体">Bin</font></div>
<div><font face="宋体"><br> </font></div>
<blockquote dir="ltr" style="PADDING-RIGHT:0px;PADDING-LEFT:5px;MARGIN-LEFT:5px;BORDER-LEFT:#000000 2px solid;MARGIN-RIGHT:0px">
<div>
<div style="FONT:9pt 宋体">----- Original Message ----- </div>
<div style="BACKGROUND:#e4e4e4;FONT:9pt 宋体"><b>From:</b> <a title="David.Sarrut@creatis.insa-lyon.fr" href="mailto:David.Sarrut@creatis.insa-lyon.fr" target="_blank">David
Sarrut</a> </div>
<div style="FONT:9pt 宋体"><b>To:</b> <a title="golder_time@163.com" href="mailto:golder_time@163.com" target="_blank">刘斌信件</a> </div>
<div style="FONT:9pt 宋体"><b>Cc:</b> <a title="gate-users@lists.opengatecollaboration.org" href="mailto:gate-users@lists.opengatecollaboration.org" target="_blank">gate-users</a> </div>
<div style="FONT:9pt 宋体"><b>Sent:</b> Friday, May 10, 2013 3:20 PM</div>
<div style="FONT:9pt 宋体"><b>Subject:</b> Re: [Gate-users] how to set MU
prescription dose lines</div>
<div><br></div></div>
<div>
<div>
<div dir="ltr">Hello,
<div><br></div>
<div>there is no direct relationship between MU and number of primaries.
You need to somehow calibrate your system such as a given number of
particles gives you a given dose (ie 1 Gy at 10 cm in water), and
make the link with the MU. </div>
<div><br></div>
<div>Yes the weight (1/N) of the particle is taken into account in the
doseactor. This is a weight associated with a particle (the E is not
divided, only the deposited E). </div>
<div><br></div>
<div>Sincerely, </div>
<div>David</div></div>
<div class="gmail_extra"><br><br>
<div class="gmail_quote">On Thu, May 2, 2013 at 4:11 PM, 刘斌信件 <span dir="ltr"><<a href="mailto:golder_time@163.com" target="_blank">golder_time@163.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid">hi,<br>
I do not know the relation between "setTotalNumberOfPrimaries" of
simulation and MU prescription dose in the external
radiotherapy . How should I set the number of the photon or events
in simulation that the absorbed depth dose in phantom will arrive at a
expected value. In addition , in Selective bremsstrahlung splitting
(SBS) technology, the final state of the process is generated N times
and the weight of each secondary is 1/N. Does it divide the energy of
photon ( original produced by the bremsstrahlung) into N pieces of
energy ,and then get single photon with original energy of
1/N in the same direction ?<br> Thank you for
attention?<br>yours
sincerely,<br>Bin<br>_______________________________________________<br>Gate-users
mailing list<br><a href="mailto:Gate-users@lists.opengatecollaboration.org" target="_blank">Gate-users@lists.opengatecollaboration.org</a><br><a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" target="_blank">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a><br>
</blockquote></div><br><br clear="all">
<div><br></div>-- <br>
<div dir="ltr">David Sarrut, Phd<br>Chargé de recherche CNRS<br>CREATIS, UMR
CNRS 5220, Inserm U 1044
<div>Centre de lutte contre le cancer Léon Bérard<br>28 rue Laënnec, 69373
Lyon cedex 08<br>Tel : 04 78 78 51 51 / 06 74 72 05 42<br><a href="http://www.creatis.insa-lyon.fr/~dsarrut" target="_blank">http://www.creatis.insa-lyon.fr/~dsarrut</a><br>_________________________________</div>
<div> "2 + 2 = 5, for extremely large values of
2"<br>_________________________________</div></div></div></div></div></blockquote></div></blockquote></div><br><br clear="all">
<div><br></div>-- <br>
<div dir="ltr">David Sarrut, Phd<br>Chargé de recherche CNRS<br>CREATIS, UMR
CNRS 5220, Inserm U 1044
<div>Centre de lutte contre le cancer Léon Bérard<br>28 rue Laënnec, 69373
Lyon cedex 08<br>Tel : 04 78 78 51 51 / 06 74 72 05 42<br><a href="http://www.creatis.insa-lyon.fr/~dsarrut" target="_blank">http://www.creatis.insa-lyon.fr/~dsarrut</a><br>_________________________________</div>
<div> "2 + 2 = 5, for extremely large values of
2"<br>_________________________________</div></div></div></div></div></blockquote></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">David Sarrut, Phd<br>Chargé de recherche CNRS<br>CREATIS, UMR CNRS 5220, Inserm U 1044<div>Centre de lutte contre le cancer Léon Bérard<br>28 rue Laënnec, 69373 Lyon cedex 08<br>
Tel : 04 78 78 51 51 / 06 74 72 05 42<br><a href="http://www.creatis.insa-lyon.fr/~dsarrut" target="_blank">http://www.creatis.insa-lyon.fr/~dsarrut</a><br>_________________________________</div><div> "2 + 2 = 5, for extremely large values of 2"<br>
_________________________________</div></div>
</div>