Detection of the mandibular canal via shaded surface display and multiplanar reconstruction of CT data

Abstract

The purpose of this study was to evaluate the sensitivity of conventional two-dimensional (2D) multisection images (multiplanar rendering, MPR) and registered three-dimensional (3D) shaded surface images (shaded surface display, SSD) of standard axial computed tomography (CT) data for detecting the mandibular canal (MC) in the lower jaw of 136 patients. The patients, who had different indications for mandibular CT, were examined using standard axial CT scanning. Two post-processing programs were used for 3D visualization of the data sets. The cross-sectional rendered images and the shaded surface 3D images were graded for detection of the MC, the presence of artefacts, overall quality and clinical relevance. A 3D display of the MC was achieved using the MPR technique in 100% with high image quality. The surface rendered display depicted the MC in 80%. Artefacts markedly degraded the 3D displays obtained using the surface rendering technique; thus, SSD is an inappropriate technique for imaging the entire MC without manual segmentation. MPR-CT improves the sensitivity of CT imaging in the detection of the MC with very little time needed for post-processing compared with the SSD method. This post-processing modality should, therefore, be considered for serial studies of patients undergoing dental CT. The sensitivity of the MPR method is even superior to the standard axial CT slices.

Evaluation of Tridimentional Computed Tomography in Assessment of Mandibular Fracture

“…According to Ogura et al 2014 (3) study, they consider that prevalence of condylar fractures using MDCT was higher than those of other reports because of the exquisite sensitivity of MDCT (9, 10) . (21) and Fatemitabar and Nikgoo 2010 (22) reported that 3D reconstructions of axial CT data were superior to 2D reformatting in furnishing the surgeon with information on the patient's individual anatomy.…”

Method of visualisation influences accuracy of measurements in cone-beam computed tomography

“…Some have recorded that single section MPR measurements of the mandible are more accurate than other outdated tomography techniques (Tomomi et al, 2004), while others concluded that shaded surface display (SSD) is an inappropriate technique for imaging the mandibular canal without manual segmentation, in contrast to MPR (Solar et al, 2001). As a cautionary note, care should be taken when comparing the results of CBCT to literature of conventional CT published over a decade ago as post-processing modules have been subject to marked advances in recent years.…”

Dental-CT zur Planung chirurgischer Eingriffe

“…Dadurch läßt sich beispielsweise der häufig schlecht sichtbare Mandibularkanal verfolgen, indem er auf jeder Schicht und in jeder Ebene eingezeichnet wird, auf der er über eine kurze oder längere Strecke erkennbar ist. Auf diese Weise kann er in seiner ganzen Länge zur Darstellung gebracht werden [65].…”