Effect of Reconstruction Filter on Image in Dental Cone Beam Computed Tomography

1. Effect of reconstruction filter on image in dental cone beam computed tomography Yuuki Houno 2. Characteristics of image in dual-energy computed tomography(CT) imaging Dae Hong Kim 3. Verification of lateral biological dose distribution with microdosimetric kinetic model in carbon-ion radiotherapy Mikoto Tamura 4. The imparct of secondary particles on in-beam PET imaging for dose verification in carbon ion therapy 5. Evaluation of radiation dose to organs and tissues in infant X-ray CT Takanori Ishii 6. Digital breast tomosynthesis and digital mammography-A comparison of figures of merit for various average glandular doses Ye Sle Kim 7. Reduction of patient dose in digital mammography: Simulation of low-dose image from routine-dose Yuki Saito-15 minutes rest – Introduction Recently, dentistry diagnoses have been performed using panoramic radiography or dental X-rays, but cone-beam CT (CBCT), which can obtain more information, has been gaining attention. CBCT has high spatial resolution, but it is difficult to describe that teeth and alveolar bones separately because the reconstructed image is blurred. It is important to know the condition of alveolar bones in diagnosis of periodontal disease or simulation of implant placement. In CBCT, spatial resolution is influenced by machine characteristics such as detector spacing, focal spot size, and overall geometry. In addition, reconstruction parameters such as the voxel size and reconstruction filter influence the spatial resolution. However, users cannot change the machine characteristics. Thus, we examined the use of a reconstruction filter to provide a sharp image.