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dc.contributor.authorMackay, Ranald I
dc.contributor.authorGraham, Paul A
dc.contributor.authorLogue, John P
dc.contributor.authorMoore, Christopher J
dc.date.accessioned2009-10-12T16:06:16Z
dc.date.available2009-10-12T16:06:16Z
dc.date.issued2001-01-01
dc.identifier.citationPatient positioning using detailed three-dimensional surface data for patients undergoing conformal radiation therapy for carcinoma of the prostate: a feasibility study. 2001, 49 (1):225-30 Int. J. Radiat. Oncol. Biol. Phys.en
dc.identifier.issn0360-3016
dc.identifier.pmid11163519
dc.identifier.urihttp://hdl.handle.net/10541/84081
dc.description.abstractPURPOSE: The increasing complexity of radiotherapy highlights the need for accurate setup. This paper assesses the potential of position corrections, derived from the three-dimensional (3D) surface of the patient, in reducing positioning errors in patients undergoing conformal radiation therapy of the prostate. METHODS AND MATERIALS: Twenty patients undergoing conformal radiation therapy for prostate cancer had planning computed tomography (CT) scans and then weekly treatment CT scans over the course of their treatment. Patients were positioned on the CT table using three coplanar tattoo marks used for patient setup on the accelerator. Surfaces were computed from the planning CT (planning surface), and the treatment CT (treatment surfaces). Using a surface matching utility, the planning and treatment 3D surfaces were compared. The prostate was implicitly localized based on surface matching of the external contour and by matching the bony anatomy. The resultant prostate displacement after correction was assessed for the two localization methods. RESULTS: Correcting patient position via the surface comparisons reduced the standard deviation of prostate displacement with respect to the patient isocenter in the lateral and anterior/posterior directions. In the lateral direction, prostate and surface motion was highly correlated (r = 0.96). In the anterior/posterior direction the corrections from the surface data were as effective as those derived from the bony anatomy. CONCLUSION: Detailed surface data can aid the positioning of patients receiving conformal radiation therapy to the prostate by reducing the displacement of the target from the intended treatment position. This study shows that surface corrections can be as effective as those derived from bony anatomy, and may be exploited where definition of bony anatomy is difficult.
dc.language.isoenen
dc.subjectProstatic Canceren
dc.subject.meshFeasibility Studies
dc.subject.meshHumans
dc.subject.meshMale
dc.subject.meshMovement
dc.subject.meshProstatic Neoplasms
dc.subject.meshRadiotherapy Planning, Computer-Assisted
dc.subject.meshRadiotherapy, Conformal
dc.subject.meshTomography, X-Ray Computed
dc.titlePatient positioning using detailed three-dimensional surface data for patients undergoing conformal radiation therapy for carcinoma of the prostate: a feasibility study.en
dc.typeArticleen
dc.contributor.departmentNorth Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. Ranald.MacKay@physics.cr.man.ac.uken
dc.identifier.journalInternational Journal of Radiation Oncology, Biology, Physicsen
html.description.abstractPURPOSE: The increasing complexity of radiotherapy highlights the need for accurate setup. This paper assesses the potential of position corrections, derived from the three-dimensional (3D) surface of the patient, in reducing positioning errors in patients undergoing conformal radiation therapy of the prostate. METHODS AND MATERIALS: Twenty patients undergoing conformal radiation therapy for prostate cancer had planning computed tomography (CT) scans and then weekly treatment CT scans over the course of their treatment. Patients were positioned on the CT table using three coplanar tattoo marks used for patient setup on the accelerator. Surfaces were computed from the planning CT (planning surface), and the treatment CT (treatment surfaces). Using a surface matching utility, the planning and treatment 3D surfaces were compared. The prostate was implicitly localized based on surface matching of the external contour and by matching the bony anatomy. The resultant prostate displacement after correction was assessed for the two localization methods. RESULTS: Correcting patient position via the surface comparisons reduced the standard deviation of prostate displacement with respect to the patient isocenter in the lateral and anterior/posterior directions. In the lateral direction, prostate and surface motion was highly correlated (r = 0.96). In the anterior/posterior direction the corrections from the surface data were as effective as those derived from the bony anatomy. CONCLUSION: Detailed surface data can aid the positioning of patients receiving conformal radiation therapy to the prostate by reducing the displacement of the target from the intended treatment position. This study shows that surface corrections can be as effective as those derived from bony anatomy, and may be exploited where definition of bony anatomy is difficult.


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