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Changes in the Pelvic Anatomy After an IMRT Treatment Fraction of Prostate Cancer

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Title: Changes in the Pelvic Anatomy After an IMRT Treatment Fraction of Prostate Cancer
Authors: de Crevoisier, Renaud1, Melancon, Adam D.2,3, Kuban, Deborah A.1, Lee, Andrew K.1, Cheung, Rex M.1, Tucker, Susan L.4, Kudchadker, Rajat J.2, Newhauser, Wayne D.2, Zhang, Lifei2, Mohan, Radhe2, Dong, Lei2 ldong@mdanderson.org
Source: International Journal of Radiation Oncology, Biology, Physics. Aug2007, Vol. 68 Issue 5, p1529-1536. 8p.
Subjects: Medical research, Medical sciences, Life sciences, Biology
Abstract: Purpose: To quantify the three-dimensional variations of pelvic anatomy after a single treatment fraction. Methods and Materials: Forty-six prostate cancer patients underwent computed tomography (CT) scanning with an in-room CT-on-rail system, before and immediately after one intensity-modulated radiotherapy (IMRT) session. To study the soft-tissue anatomy changes, the pre- and post-treatment CT images were registered using the bony structure with an in-house image registration software system. The center of volume for both the prostate and seminal vesicles was used to assess the relative displacement of the same structure after the treatment fraction. Results: During one treatment fraction (21 +/- 4 min), both the prostate and seminal vesicles showed statistically significant systematic trends in the superior and anterior directions of the patient's anatomy. The net increase in bladder volume was huge (127 +/- 79 cm(3)), yet this change did not translate into large target displacements. Although the population mean displacements in either direction were 1.3 +/- 2.9 mm for the prostate and 1.2 +/- 4.1 mm for the seminal vesicles in the anterior direction, a few patients had displacements as large as 8.4 mm and 15.6 mm, respectively. These large displacements correlated strongly (p < 0.001) with large rectal volume increases caused by gaseous build-up in the rectum. Conclusion: The observed intrafraction variations in anatomy during prostate IMRT sessions suggest that, for any given fraction, the organ motion and volume changes can potentially lead to compromised target coverage in about 15% of patients in whom the prostate position shifted >4 mm. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Radiation Oncology, Biology, Physics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Changes in the Pelvic Anatomy After an IMRT Treatment Fraction of Prostate Cancer
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22de+Crevoisier%2C+Renaud%22&quot;&gt;de Crevoisier, Renaud&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Melancon%2C+Adam+D%2E%22&quot;&gt;Melancon, Adam D.&lt;/searchLink&gt;&lt;relatesTo&gt;2,3&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Kuban%2C+Deborah+A%2E%22&quot;&gt;Kuban, Deborah A.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Lee%2C+Andrew+K%2E%22&quot;&gt;Lee, Andrew K.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Cheung%2C+Rex+M%2E%22&quot;&gt;Cheung, Rex M.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Tucker%2C+Susan+L%2E%22&quot;&gt;Tucker, Susan L.&lt;/searchLink&gt;&lt;relatesTo&gt;4&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Kudchadker%2C+Rajat+J%2E%22&quot;&gt;Kudchadker, Rajat J.&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Newhauser%2C+Wayne+D%2E%22&quot;&gt;Newhauser, Wayne D.&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zhang%2C+Lifei%22&quot;&gt;Zhang, Lifei&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Mohan%2C+Radhe%22&quot;&gt;Mohan, Radhe&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Dong%2C+Lei%22&quot;&gt;Dong, Lei&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;i&gt; ldong@mdanderson.org&lt;/i&gt;
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  Data: &lt;bold&gt;Purpose: &lt;/bold&gt;To quantify the three-dimensional variations of pelvic anatomy after a single treatment fraction. &lt;bold&gt;Methods and Materials: &lt;/bold&gt;Forty-six prostate cancer patients underwent computed tomography (CT) scanning with an in-room CT-on-rail system, before and immediately after one intensity-modulated radiotherapy (IMRT) session. To study the soft-tissue anatomy changes, the pre- and post-treatment CT images were registered using the bony structure with an in-house image registration software system. The center of volume for both the prostate and seminal vesicles was used to assess the relative displacement of the same structure after the treatment fraction. &lt;bold&gt;Results: &lt;/bold&gt;During one treatment fraction (21 +/- 4 min), both the prostate and seminal vesicles showed statistically significant systematic trends in the superior and anterior directions of the patient&#39;s anatomy. The net increase in bladder volume was huge (127 +/- 79 cm(3)), yet this change did not translate into large target displacements. Although the population mean displacements in either direction were 1.3 +/- 2.9 mm for the prostate and 1.2 +/- 4.1 mm for the seminal vesicles in the anterior direction, a few patients had displacements as large as 8.4 mm and 15.6 mm, respectively. These large displacements correlated strongly (p &lt; 0.001) with large rectal volume increases caused by gaseous build-up in the rectum. &lt;bold&gt;Conclusion: &lt;/bold&gt;The observed intrafraction variations in anatomy during prostate IMRT sessions suggest that, for any given fraction, the organ motion and volume changes can potentially lead to compromised target coverage in about 15% of patients in whom the prostate position shifted &gt;4 mm. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of International Journal of Radiation Oncology, Biology, Physics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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