background: cone-beam computed tomography (cbct) is a new imaging technology that has been widely used in implantology, oral and maxillofacial surgery and orthodontics. this method provides 3-d images that are composed of voxel, which is the smallest image unit, and determines image resolution. smaller voxel is associated with the higher resolution and also greater radiation exposure. this stud...

Recent studies suggested that fMRI voxel patterns can convey information represented in columnar-scale neuronal population codes, even when spatial resolution is insufficient to directly image the patterns of columnar selectivity (Kamitani and Tong, 2005; Haynes and Rees, 2005). Sensitivity to subvoxel-scale pattern information, or "fMRI hyperacuity," would greatly enhance the power of fMRI whe...

We consider the problem of defining and evaluating the distance between three–dimensional pattern P [1::m; 1::m; 1::m] of voxels and three–dimensional volume V [1::n; 1::n; 1::n] of voxels when also rotations of P are allowed. In particular, we are interested in finding the orientation and location of P with respect of V that gives the minimum distance. We consider several distance measures. Ou...

conclusion considering the similar diagnostic efficacy of all voxel sizes, 300 µm voxel size can be used with adequate efficacy for detection of external root resorption defects with minimal patient radiation dose and the shortest scanning time. background selecting a voxel size that yields minimal radiation dose with no significant compromise of the diagnostic accuracy of cone beam computed to...

OBJECTIVE Hypofrontality is not a well-replicated finding in schizophrenia either at rest or under conditions of task activation. METHOD Studies comparing whole brain and frontal blood flow/metabolism in schizophrenic patients and normal controls were pooled. Voxel-based studies were also combined to examine the pattern of prefrontal activation in schizophrenia. RESULTS Whole brain flow/met...