Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2003 · 15 citations · 0 references
Veterinary MedicineBiomedical EngineeringRadiologyBiomedical ImagingDiagnostic ImagingDiagnostic RadiologyComputed TomographyComputed Tomography PhysicsDiagnostic Imaging SystemsImage Quality AssessmentMedical ImagingMedical Imaging PhysicsComputed Tomography AcquisitionDetector Spatial ResolutionImage Acquisition QualityLow-contrast DetectabilityPerformance LimitsRadiographic Image QualityX-ray Imaging PerformanceX-ray Imaging Systems
We present results on 3D image quality in terms of spatial resolution (MTF) and low contrast detectability, obtained on a flat dynamic X-ray detector (FD) based cone-beam CT (CB-CT) setup. Experiments have been performed on a high precision bench-top system with rotating object table, fixed X-ray tube and 176 x 176 mm<sup>2</sup> active detector area (Trixell Pixium 4800). Several objects, including CT performance-, MTF- and pelvis phantoms, have been scanned under various conditions, including a high dose setup in order to explore the 3D performance limits. Under these optimal conditions, the system is capable of resolving less than 1% (~10 HU) contrast in a water background. Within a pelvis phantom, even inserts of muscle and fat equivalent are clearly distinguishable. This also holds for fast acquisitions of up to 40 fps. Focusing on the spatial resolution, we obtain an almost isotropic three-dimensional resolution of up to 30 lp/cm at 10% modulation.