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<br>The main reason for not doing a 3D-3D registration is that we do not, obviously, have the luxury of acquiring 3D data sets every time the patients come by. The 3D-CT scan is acquired once with which radiotherapy planning is done initially. After that visit, the patients are scanned daily using a kV-imager twice that gives two 2D images in orthogonal planes (as described below).<br>I think these 2 orthogonal projection images have enough information to be considered "equivalent" to a 3D image. Am i right ? If not, then why not?<br><br>When these 2 orthogonal projection images acquired on 2 different days are registered to each other, I would like to obtain the corresponding deformation fields in XZ and YZ. For every point P in the fixed image, I want to evaluate its new location P' in the moving image (using say, WarpImageFilter).<br><br><br>Thank you,<br>Ganesh<br><br><font style="" color="#1f497d" face="Verdana">************************************************************************</font><font style="" color="#1f497d" face="Verdana"><br></font><font style="" color="#1f497d" face="Verdana">
"What the mind of man can conceive and believe, It can achieve" - </font><font style="" color="#1f497d" face="Verdana"><span class="ecxil">Napolean</span></font><font style="" color="#1f497d" face="Verdana"> </font><font style="" color="#1f497d" face="Verdana"><span class="ecxil">Hill</span></font><font style="" color="#1f497d" face="Verdana"><br></font><font style="" color="#1f497d" face="Verdana">
-Ganesh
Narayanasamy,Ph.D., PostDoc-University of Kentucky Cancer Center</font><font style="" color="#1f497d" face="Verdana"><br></font><font style="" color="#1f497d" face="Verdana">
Earlier work:
http://www.sciencedaily.com/releases/2007/05/070504133017.htm</font><font style="" color="#1f497d" face="Verdana"><br></font><font style="" color="#1f497d" face="Verdana">
************************************************************************</font><br><br><br><br>> Date: Thu, 8 Apr 2010 14:43:28 -0400<br>> Subject: Re: [Insight-users] Applying two 2D registration transforms into a 3D image<br>> From: luis.ibanez@kitware.com<br>> To: nganesh76@hotmail.com<br>> CC: insight-users@itk.org<br>> <br>> Hi Ganesh,<br>> <br>> Thanks for the detailed description of the problem that you are working on.<br>> <br>> Unfortunately, the deformation fields of the two 2D deformable registrations<br>> do not carry enough information for you to do a 3D deformation of the T1<br>> and T2 original 3D-images.<br>> <br>> <br>> Any reason for not doing real 3D deformable registration in the<br>> original images ?<br>> <br>> [...ITK will do registration on N-D images...]<br>> <br>> <br>> Please let us know,<br>> <br>> <br>> Thanks<br>> <br>> <br>> Luis<br>> <br>> <br>> <br>> ------------------------------------------------------------------------------------<br>> On Wed, Apr 7, 2010 at 1:06 PM, Ganesh Narayanasamy<br>> <nganesh76@hotmail.com> wrote:<br>> ><br>> > I have a pair of 3D-CT images acquired on a phantom with some internal<br>> > changes (known).<br>> > A 2D-DRR (digitally reconstructed radiograph) image is constructed such<br>> > that the pixel value on the DRR image should be given by the accumulated<br>> > intensities of the 3D image volume along the direction. With the T1 or fixed<br>> > 3D-CT image, we have created two such DRRs, say along the XZ and YZ axes.<br>> > Let us call these 2 DRRs as T1DRR_XZ and T1DRR_YZ.<br>> ><br>> > Likewise, we have created 2 DRRs from the T2 3D-CT image namely, T2DRR_XZ<br>> > and T2DRR_YZ.<br>> ><br>> > Using a deformable 2D registration model (say, Bspline), we would like to<br>> > register T1DRR_XZ with T2DRR_XZ and also T1DRR_YZ with T2DRR_YZ. From these<br>> > 2 transformations along the 2 orthogonal planes (XZ and YZ), is it possible<br>> > to "compute" the 3D transform between the two 3D-CT images ?<br>> ><br>> > Can I then "apply" these two 2D transforms or the single computed 3D<br>> > transform into the T1 image to obtain a T(T1) image that is comparable with<br>> > the T2 image.<br>> ><br>> > Thanks a ton,<br>> > -Ganesh<br>> ><br>> ><br>> > ************************************************************************<br>> > "What the mind of man can conceive and believe, It can achieve" - Napolean<br>> > Hill<br>> > -Ganesh Narayanasamy,Ph.D., PostDoc-University of Kentucky Cancer Center<br>> > Earlier work: http://www.sciencedaily.com/releases/2007/05/070504133017.htm<br>> > ************************************************************************<br>> ><br>> ><br>> > ________________________________<br>> > The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with<br>> > Hotmail. Get busy.<br>> > _____________________________________<br>> > Powered by www.kitware.com<br>> ><br>> > Visit other Kitware open-source projects at<br>> > http://www.kitware.com/opensource/opensource.html<br>> ><br>> > Kitware offers ITK Training Courses, for more information visit:<br>> > http://www.kitware.com/products/protraining.html<br>> ><br>> > Please keep messages on-topic and check the ITK FAQ at:<br>> > http://www.itk.org/Wiki/ITK_FAQ<br>> ><br>> > Follow this link to subscribe/unsubscribe:<br>> > http://www.itk.org/mailman/listinfo/insight-users<br>> ><br>> ><br> <br /><hr />The New Busy is not the old busy. Search, chat and e-mail from your inbox. <a href='http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_3' target='_new'>Get started.</a></body>
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