Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2004 · 25 citations · 0 references
MedicineBiomedical EngineeringRadiologyDiagnostic ImagingDiagnostic RadiologyRadiation DosimetryAbsorbed DoseComputed TomographyComputed Tomography Dose ManagementComputed Tomography PhysicsMedical ImagingPhantom DosimetryComputed Tomography Dose MeasurementComputed Tomography Phantom DosimetryEnergy DepositionEnergy Deposition ProfilesIntrinsic AttenuationPhantom-based Dose MeasurementRadiation Dose EstimationRadiation Dose Optimization
Dose is becoming increasingly important for computed tomography clinical practice. It is of general interest to understand the impact that system design can have on dose and image quality. This study addresses the effect of bowtie shape on the dose and contrast-to-noise across the field of view. Simulation of the CT acquisition is used to calculate the energy deposition throughout a numerical phantom for a set of relevant system operating parameters and bowtie shapes. Mean absorbed dose is calculated by summing over the phantom volume and is compared with other typical dose specifications. A more aggressive attenuation profile of the bowtie which offers higher attenuation in the periphery of the field of view can offer the benefit of lower dose but at the expense of reduced contrast-to-noise at the edge of the cross-sectional image.