{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T19:33:24Z","timestamp":1791228804312,"version":"4.1.0"},"reference-count":37,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2009,11,11]],"date-time":"2009-11-11T00:00:00Z","timestamp":1257897600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Medical Physics"],"published-print":{"date-parts":[[2009,12]]},"abstract":"<jats:sec><jats:title>Purpose:<\/jats:title><jats:p>The purpose of this study was to analyze the relationship between prostate, bladder, and rectum volumes on treatment planning CT day and prostate shifts in the<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0001.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0001\"\/> directions on treatment days.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods:<\/jats:title><jats:p>Prostate, seminal vesicles, bladder, and rectum were contoured on CT images obtained in supine position. Intensity modulated radiation therapy plans was prepared. Contours were exported to BAT\u2010ultrasound imaging system. Patients were positioned on the couch using skin marks. An ultrasound probe was used to obtain ultrasound images of prostate, bladder, and rectum, which were aligned with CT images. Couch shifts in the<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0002.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0002\"\/> directions as recommended by BAT system were made and recorded. 4698 couch shifts for 42 patients were analyzed to study the correlations between interfraction prostate shifts vs bladder, rectum, and prostate volumes on planning CT.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p>Mean and range of volumes (cc): Bladder: 179 (42\u2013582), rectum: 108 (28\u2013223), and prostate: 55 (21\u2013154). Mean systematic prostate shifts were (cm, \u00b1SD) right and left lateral:<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0003.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0003\"\/> (\u22120.361\u20130.251), anterior and posterior: <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0004.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0004\"\/> (\u22120.466\u20130.669), and superior and inferior: <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0005.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0005\"\/> (\u22120.342\u20130.633). Bladder volume was not correlated with lateral, anterior\/posterior, and superior\/inferior prostate shifts <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0006.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0006\"\/>. Rectal volume was correlated with anterior\/posterior <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0007.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0007\"\/> but not with lateral and superior\/inferior prostate shifts <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0008.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0008\"\/>. The smaller the rectal volume or cross sectional area, the larger was the prostate shift anteriorly and vice versa <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0009.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0009\"\/>. Prostate volume was correlated with superior\/inferior <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0010.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0010\"\/> but not with lateral and anterior\/posterior prostate shifts <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0011.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0011\"\/>. The smaller the prostate volume, the larger was prostate shift superiorly and vice versa <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/mp0840-math-0012.png\" xlink:title=\"urn:x-wiley:00942405:media:mp0840:mp0840-math-0012\"\/>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions:<\/jats:title><jats:p>Prostate and rectal volumes, but not bladder volumes, on treatment planning CT influenced prostate position on treatment fractions. Daily image\u2010guided adoptive radiotherapy would be required for patients with distended or empty rectum on planning CT to reduce rectal toxicity in the case of empty rectum and to minimize geometric miss of prostate.<\/jats:p><\/jats:sec>","DOI":"10.1118\/1.3260840","type":"journal-article","created":{"date-parts":[[2009,11,24]],"date-time":"2009-11-24T23:37:16Z","timestamp":1259105836000},"page":"5604-5611","source":"Crossref","is-referenced-by-count":22,"title":["Influence of volumes of prostate, rectum, and bladder on treatment planning CT on interfraction prostate shifts during ultrasound image\u2010guided IMRTa)"],"prefix":"10.1002","volume":"36","author":[{"given":"Nandanuri M. 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