![]() VMI and IMAR techniques in split-filter DECT may be combined for clinical head and neck imaging to reduce artifact from dental hardware and improve image quality. ![]() Though the results for IMAR and VMI IMAR were similar overall, VMI IMAR had a small benefit at 100 keV.ĬLINICAL IMPACT. For reducing severe artifact due to dental material, IMAR has greater effect than VMI. The two readers preferred VMI IMAR at 100 keV in 56.8% and 59.1% of examinations.ĬONCLUSION. 05) for VMI IMAR versus IMAR only at 100 keV. Artifact-impaired soft tissue–corrected attenuation and soft-tissue interpretability significantly improved ( p <. Median soft-tissue interpretability was 1.2 for standard imaging, 1.1–1.2 for VMI, 3.7 for IMAR, and 2.0–3.8 for VMI IMAR. Mean artifact-impaired soft tissue–corrected noise was 58.7 HU for standard imaging, 38.2 to 129.7 HU for VMI, 11.0 HU for IMAR, and 5.8 to 45.6 HU for VMI IMAR. Mean artifact-impaired soft tissue–corrected attenuation was 10.8 HU for standard imaging, −0.6 to 24.9 HU for VMI, 4.3 HU for IMAR, and −2.0 to 7.8 HU for VMI IMAR. Mean hypoattenuating artifact-corrected attenuation was −455.1 HU for standard imaging, −408.5 to −679.9 HU for VMI, −37.3 for IMAR, and −17.8 to −36.9 HU for VMI IMAR. Mean hyperattenuating artifact-corrected attenuation was 521.0 HU for standard imaging, 496.4–892.2 HU for VMI, 48.2 HU for IMAR, and 32.8–91.0 HU for VMI IMAR. Readers selected the preferred reconstruction for each patient. Two radiologists independently assessed soft-tissue interpretability (1–5 scale), and pooled ratings were analyzed. ROIs were placed to measure corrected attenuation in pronounced hyperattenuating and hypoattenuating artifacts and artifact-impaired soft tissue and to measure corrected artifact-impaired soft-tissue noise. Standard, VMI, IMAR, and VMI IMAR images were generated VMI and VMI IMAR were performed at 40, 70, 100, 120, 150, and 190 keV. This retrospective study included 44 patients (nine woman, 35 men mean age, 66.0 ± 10.4 years) who underwent head and neck CT and had severe dental hardware artifact. The purpose of this study was to compare metal artifact reduction between VMI, IMAR, and their combination (VMI IMAR) in split-filter single-source DECT of patients with severe dental hardware artifact. Their combination is poorly described for single-source DECT systems. Both postprocessing-based iterative metal artifact reduction (IMAR) and virtual monoenergetic imaging (VMI) reconstruction in dual-energy CT (DECT) can reduce metal artifact. Head and neck CT can be limited by dental hardware artifact. Los modelos 3D de los núcleos líticos de la Chatelperroniense, Protoauriñaciense, y los niveles del Auriñaciense antiguo del sítio de Les Cottés (Francia) se proporcionan como ejemplos de la calidad del modelo que se puede producir usando este sistema.Please see the Editorial Comment by Sabine Sartoretti-Schefer discussing this article.īACKGROUND. También, se proporcionan consejos adicionales relativos al recubrimiento los objetos difíciles de capturar en un aerosol mineral. At a technical level, data corruption is the common way to describe damaged data. Esta plataforma de bajo coste agiliza en gran medida tanto la toma de fotografías como las etapas de post-procesamiento de la creación del modelo. The term digital artifact is most commonly used to describe visual flaws in data. ![]() Como parte de un proyecto para documentar la variabilidad en los sistemas de producción lítica a través de la transición del Paleolítico Medio al Paleolítico Superior en la Europa del Oeste, una plataforma de fotografía fue desarrollada con el propósito expreso de tomar fotografías para la creación de modelos fotogramétricos 3D. En comparación con otros métodos de modelado en 3D, el registro de la fotogrametría tiene las ventajas de ser relativamente barato, móvil, y más adaptable para usar en condiciones de campo. Modelar artefactos en 3D se está convirtiendo en una de las herramientas más utilizadas en arqueología. Three-dimensional models of lithic cores from the Châtelperronian, Protoaurignacian, and Early Aurignacian levels of the site of Les Cottés (France) are presented as examples of the quality of model that can be produced using this system. Additional tips relating to the coating of difficult-to-capture objects with a mineral spray are also provided. This low-cost rig greatly streamlines both the photo-taking and post-processing stages of model creation. As part of a larger project to document variability in lithic production systems across the Middle to Upper Paleolithic Transition in Western Europe, we developed a photography rig for the express purpose of systematically capturing images for the creation of 3D photogrammetric models. In comparison with other methods of 3D scanning, photogrammetry has the benefits of being relatively inexpensive, mobile, and more adaptable for use in field conditions. ![]() Three-dimensional (3D) artifact modeling is becoming an increasingly utilized tool in archaeology.
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