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Dear all,<div><br></div><div>I am using a software Elastix developed based on ITK, which asks for using identity direction cosine matrix to run the constraint Nonrigid registration properly. This means I will have to change the direction in all the original images. I got two suggestion on the direction issue.</div><div><br></div><div>In a related post, Luis suggests that</div><div><br></div><div><span class="Apple-style-span" style="font-family: Tahoma, Verdana, Arial, sans-serif; color: rgb(68, 68, 68); "><pre style="white-space: normal; ">BTW: changing the direction of a medical image can<br>be a dangerous thing to do. You should make sure<br>that you have a good justification for replacing the<br>direction of the original image.</pre><pre style="white-space: normal; "><br></pre><pre style="white-space: normal; ">However, another ITK user suggest me to make sure all images have identity direction matrix before doing any further process. Therefore I am a little bit confused here. I assume Luis and the other user concern different issues.</pre><pre style="white-space: normal; ">I am not sure the meaning of the last sentence from Luis, what kind of issues I need to worry to get a good justification for replacing the direction of the original images.</pre><pre style="white-space: normal; ">In order to decide whether to change the direction of the original images, I would like to know how and what the direction matrix would effect the registration result in ITK.</pre><pre style="white-space: normal; "><br></pre><pre style="white-space: normal; ">Kind regards,</pre></span><br>--------------------------------<br>Xi Liang<br><br>ÁºÜç<br>--------------------------------<br><br><br></div> <br /><hr />Hotmail: Free, trusted and rich email service. <a href='https://signup.live.com/signup.aspx?id=60969' target='_new'>Get it now.</a></body>
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