Publications by authors named "A N van Daatselaar"
Objectives: To determine the image quality of the local CT imaging procedure, in terms of resolution, contrast, and noise as a function of the number of projections.
Methods: The contrast and resolution of the images was determined with a phantom object consisting of three rods of different materials, as well as a phantom human head embedded in soft tissue equivalent material. In addition, slices reconstructed from computed sinograms were used for comparison.
Minimum number of basis projections for caries detection with local CT.
Dentomaxillofac Radiol
November 2004
Objectives: To investigate the relationship between the number of basis projections for local computed tomography (CT) and the detection of proximal caries and to find a minimum number of projections needed to maintain diagnostic accuracy.
Methods: We presented observers (n = 12) with stacks of both axial and vertical CT slices of 23 extracted teeth placed in a dry human mandible. The slices were prepared with 14, 20, 33 and 100 basis projections.
Region filling has many applications in computer graphics and image analysis. Some region filling tasks can be performed by fast scan line filling algorithms. Other region filling tasks require seed filling algorithms which are more general but slower.
View Article and Find Full Text PDFObjectives: An in vitro observer study of the detection of interproximal caries by local CT.
Methods: Detection of caries by means of conventional two-dimensional (2D) digital radiography and by two CT modalities was compared. Ground truth was obtained from histological examination of the sectioned teeth.
Objectives: To prove the feasibility of a local CT system as a method of CT suitable for use in dentistry.
Methods: Using an experimental set-up consisting of an X-ray source, a turntable and a charge-coupled device (CCD) detector connected to a PC, CT scans were made of a single molar and a dry mandible. Slices were reconstructed using filtered backprojection.