[PDF] Top 20 Effect of Exposure Parameters on Metal Artifacts in Cone Beam Computed Tomography

... Three parallel holes with 3mm diameter and 8mm height were placed in the mandible. The anterior hole was drilled at the canine site, the middle hole was created at the second premolar site, and the posterior hole was ... See full document

... M. Beam hardening artifacts: comparison between two cone beam computed tomography ...M. Effect of Exposure Parameters on Metal Artifacts in ... See full document

... truncation artifacts directly in the DICOM image ...truncation artifacts without access to projection ...Low-dose computed tomography (LDCT) image ...of metal artefact reduction (MAR) ... See full document

... The thickness of the tissues is an important factor that can influence tissue density estima- tions. Therefore, in the present study, all the samples were of equal thickness. Although Kat- sumata et al stated that in ... See full document

... as exposure parameters (mAs and kVp), size and position of the FOV, and pixel size can influence the accuracy and quality of CBCT images [2, ...the beam can cover the ... See full document

... All exposure parameters are shown in Table ...acquisition parameters but with half thickness. In order to overcome the effect of various computer programs, all CT and CBCT images were imported ... See full document

... treatment. Cone-beam computed tomography (CBCT) was used to scan and measure six clinical parameters, including the length of the interproximal contact area in the food impaction zone, ... See full document

... of exposure to more radiosen- sitive areas and larger areas such as gonadal tissues, breast, colon, lung and stomach are not ...radiation exposure from a dental CBCT is isolated to a portion of head, this ... See full document

... beam algorithm developed by Feldkamp et al in 1984[10].CBCT machine have two major differences compared with so called “Medical” CT scanners. First CBCT uses a low energy fixed anode tube, similar to that used in ... See full document

... much. Cone beam technology centered on an image intensifier may create distortion of the periphery of the ...motion artifacts are largely limited with current CBCT units; however, they are not ... See full document

... Results: The huge range in dose and diagnostic image quality requires further optimization and justification prior to clinical use. Yet, indications in implant dentistry may go beyond diagnostics. In fact, the inherent ... See full document

... Previously, researchers have proposed various binary image methods for dental CBCT. Naitoh et al. [31] used five different grayscale threshold values between cortical bone and water values to binarize images. Ibrahim et ... See full document

... Image quality variations can be reduced or increased by altering the FOV, and the image reconstruction parameters and post-processing methods are studied based on the type of CBCT system used. The selected FOV for ... See full document

... imaging artifacts which may lead to incorrect treatment planning volumes, lesion localization, or inference of change in tumor volume over ...puted tomography (4DCT) using external respiratory surrogates ... See full document

... the exposure of these children to high doses of ionizing radiation for the diagnosis, treatment planning and follow up of Orthodontic treatment (Olsson, 1967; Seelentag et ...radiation exposure for longer ... See full document

... India. Protocol of the study was approved from authorized ethical committee. The CBCT dental imaging system (SIRONA, Germany) operating at 85 kVp and 6mA and used was 8 × 8 cm with 14 second of exposure time. ... See full document

... using cone-beam computed tomography (CBCT) to assess root canal morphology has become popular; however, few studies have examined its efficiency to assess the entire root canals, including the ... See full document

... The lower first molar appears in the oral cavity at six years of age [5]; exposing it for earlier decay and operative interventions in dental clinics. The anatomical pattern of tooth root canals represents unique ... See full document

... For the study, pins were inserted in all tooth locations on a dry skull which was fixed on a positioner. The angular position of the skull was changed in lateral and forward- backward planes for imaging. The vertical ... See full document

... Background: To examine the detailed anatomy of the normal temporomandibular joint (TMJ) in a large series of patients divided into different age groups. Materials and methods: Cone-beam computed ... See full document