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On-line portal imaging: computer-assisted error measurement.
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1991
Year
EngineeringInterventional RadiologySurgeryCalibrationRadiation Therapy PlanningInstrumentationRadiation OncologyNuclear MedicineMicrocomputer-based SystemRadiologyHealth SciencesComputer-assisted SurgeryMedical ImagingOn-line Portal ImagingImage GuidanceDigital ImagingMedical Image ComputingRadiographic ImagingOn-line PortalElectronic ImagingBiomedical ImagingReference MarkersTomography
A microcomputer-based system was implemented in an on-line portal imaging system to determine portal misalignment in radiation therapy. Reference markers derived from a patient simulation film are superposed on the daily on-line portal images for visual evaluation of placement accuracy. The ability to check the alignment after administration of 3-6 cGy of radiation and the minimal operator interaction required make this system useful in radiation therapy delivery.