Effects of Reconstruction Parameters on Image Noise and Spatial Resolution in Cone-beam Computed Tomography

Optimizing the reconstruction filter in cone-beam CT to improve periodontal ligament space visualization: An in vitro study

“…These results of the sensory and physical evaluations carried out in this study correspond well with the results of a previous study. 19 …”

“…Therefore, we have focused on the image reconstruction filter in the FBP algorithm to attempt to reduce image blur and improve spatial resolution. 19 One key method to improve the results of CT imaging is changing the reconstruction filter to optimize image characteristics that depend on the region of interest. For example, in chest CT imaging, a reconstruction filter that emphasizes the high-frequency component has been applied, 20 and in soft-tissue CT imaging, a reconstruction filter that suppresses the high-frequency component has been used.…”

Modulation transfer function evaluation of cone beam computed and microcomputed tomography by using slanted edge phantom

“…Brüllmann et al [29] found in their review, that there is a large variance between the values of observer based visual assessment and the quantitative MTF determination. In addition, numerous studies focusing on MTF measurements as a possible way for quantitatively evaluate the X-ray based imaging devices using cone-beam geometry [28,30,33,[35][36][37]. The image quality and consequently spatial resolution is influenced by several other factors such as focal spot size, overall geometry, tube voltage, tube current, exposure time, rotation arc, the size of field of view (FOV) and the reconstruction parameters as well as the image noise and the movement of the object [7,29,[37][38][39].…”

“…In addition, numerous studies focusing on MTF measurements as a possible way for quantitatively evaluate the X-ray based imaging devices using cone-beam geometry [28,30,33,[35][36][37]. The image quality and consequently spatial resolution is influenced by several other factors such as focal spot size, overall geometry, tube voltage, tube current, exposure time, rotation arc, the size of field of view (FOV) and the reconstruction parameters as well as the image noise and the movement of the object [7,29,[37][38][39]. Rueckel et al [30] found in their micro-CT study a significant correlation between the focal spot enlargement, which is strongly influenced by the tube power, and the range of magnification: in the case of magnification higher than 30 the gain of spatial resolution is mainly limited by the focus size and less dominant.…”

“…Rueckel et al [30] found in their micro-CT study a significant correlation between the focal spot enlargement, which is strongly influenced by the tube power, and the range of magnification: in the case of magnification higher than 30 the gain of spatial resolution is mainly limited by the focus size and less dominant. In a CBCT study Lee et al [37] concluded that the spatial resolution can be improved by changing the voxel sizes and the reconstruction filters, however the image noise will be increased for smaller voxel sizes. It is important to emphasize that the voxel size given by the manufacturer is a technical parameter, which is not equal to the spatial resolution of the imaging system [29,40].…”