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dc.contributor.authorMcBain, Catherine A
dc.contributor.authorKhoo, Vincent S
dc.contributor.authorBuckley, David L
dc.contributor.authorSykes, Jonathan S
dc.contributor.authorGreen, Melanie M
dc.contributor.authorCowan, Richard A
dc.contributor.authorHutchinson, Charles E
dc.contributor.authorMoore, Christopher J
dc.contributor.authorPrice, Patricia M
dc.date.accessioned2009-12-09T14:28:52Z
dc.date.available2009-12-09T14:28:52Z
dc.date.issued2009-11-01
dc.identifier.citationAssessment of bladder motion for clinical radiotherapy practice using cine-magnetic resonance imaging. 2009, 75 (3):664-71 Int. J. Radiat. Oncol. Biol. Phys.en
dc.identifier.issn1879-355X
dc.identifier.pmid19473781
dc.identifier.doi10.1016/j.ijrobp.2008.11.040
dc.identifier.urihttp://hdl.handle.net/10541/87685
dc.description.abstractPURPOSE: Organ motion is recognized as the principal source of inaccuracy in bladder radiotherapy (RT), but there is currently little information on intrafraction bladder motion. METHODS AND MATERIALS: We used cine-magnetic resonance imaging (cine-MRI) to study bladder motion relevant to intrafraction RT delivery. On two occasions, a 28 minute cine-MRI sequence was acquired from 10 bladder cancer patients and 5 control participants immediately after bladder emptying, after abstinence from drinking for the preceding hour. From the resulting cine sequences, bladder motion was subjectively assessed. To quantify bladder motion, the bladder was contoured in imaging volume sets at 0, 14, and 28 min to measure changes to bladder volumes, wall displacements, and center of gravity (COG) over time. RESULTS: The dominant source of bladder motion during imaging was bladder filling (up to 101% volume increase); rectal and small bowel movements were transient, with minimal impact. Bladder volume changes were similar for all participants. However for bladder cancer patients, wall displacements were larger (up to 58 mm), less symmetrical, and more variable compared with nondiseased control bladders. CONCLUSIONS: Significant and individualized intrafraction bladder wall displacements may occur during bladder RT delivery. This important source of inaccuracy should be incorporated into treatment planning and verification.
dc.language.isoenen
dc.subjectTumour Burdenen
dc.subjectUrinary Bladder Canceren
dc.subject.meshAged
dc.subject.meshCase-Control Studies
dc.subject.meshDose Fractionation
dc.subject.meshFemale
dc.subject.meshHumans
dc.subject.meshIntestine, Small
dc.subject.meshMagnetic Resonance Imaging, Cine
dc.subject.meshMale
dc.subject.meshMiddle Aged
dc.subject.meshMovement
dc.subject.meshOrgan Size
dc.subject.meshProspective Studies
dc.subject.meshRectum
dc.subject.meshReproducibility of Results
dc.subject.meshTumor Burden
dc.subject.meshUrinary Bladder
dc.subject.meshUrinary Bladder Neoplasms
dc.subject.meshUrine
dc.titleAssessment of bladder motion for clinical radiotherapy practice using cine-magnetic resonance imaging.en
dc.typeArticleen
dc.contributor.departmentAcademic Department of Radiation Oncology, The University of Manchester, Christie Hospital NHS Foundation Trust, Wilmslow Road, Manchester, United Kingdom.en
dc.identifier.journalInternational Journal of Radiation Oncology, Biology, Physicsen
html.description.abstractPURPOSE: Organ motion is recognized as the principal source of inaccuracy in bladder radiotherapy (RT), but there is currently little information on intrafraction bladder motion. METHODS AND MATERIALS: We used cine-magnetic resonance imaging (cine-MRI) to study bladder motion relevant to intrafraction RT delivery. On two occasions, a 28 minute cine-MRI sequence was acquired from 10 bladder cancer patients and 5 control participants immediately after bladder emptying, after abstinence from drinking for the preceding hour. From the resulting cine sequences, bladder motion was subjectively assessed. To quantify bladder motion, the bladder was contoured in imaging volume sets at 0, 14, and 28 min to measure changes to bladder volumes, wall displacements, and center of gravity (COG) over time. RESULTS: The dominant source of bladder motion during imaging was bladder filling (up to 101% volume increase); rectal and small bowel movements were transient, with minimal impact. Bladder volume changes were similar for all participants. However for bladder cancer patients, wall displacements were larger (up to 58 mm), less symmetrical, and more variable compared with nondiseased control bladders. CONCLUSIONS: Significant and individualized intrafraction bladder wall displacements may occur during bladder RT delivery. This important source of inaccuracy should be incorporated into treatment planning and verification.


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