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Focal volume reduction in transcranial focused ultrasound using spherical wave expansions.
Ultrasonics
January 2025
School of Biological Science and Medical Engineering, Beihang University, Beijing, China. Electronic address:
Transcranial focused ultrasound (tFUS) has been gaining increased attention as a non-invasive modality for treating brain diseases. However, accurately focusing on brain structures remains a challenge as the ultrasound is severely distorted by the presence of the skull. In this article, we propose a promising distortion correction method based on spherical wave expansions.
View Article and Find Full Text PDFSimultaneous Lefort 2 Distraction and Fronto-Orbito-Malar Advancement: Correcting Severe Upper and Midface Retrusion in a Patient With Crouzon Syndrome.
J Craniofac Surg
December 2024
Member of Sociedad Argentina de Ortodoncia, Member of International Society of Craneofacial Surgery, Member of Asociación Latinoamericana de Ortodoncia, Buenos Aires, Argentina.
Craniofacial syndromes present with exorbitism and airway obstruction as a result of upper and middle facial hypoplasia. Classical subcranial Lefort III (LF III) or monobloc distraction osteogenesis (DO) using an external craniofacial device is used to treat these deformities. These procedures are done during mixed dentition, in most cases, advancing an abnormal face, to a more normal position.
View Article and Find Full Text PDFMultidisciplinary Oral Rehabilitation of Complex Frontonasal Dysplasia: A Case Report.
Cleft Palate Craniofac J
January 2025
Division of Orthodontics, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, Brazil.
This case report presents the multidisciplinary treatment of a male patient with a complex form of frontonasal dysplasia who presented with a 0 to 14 facial cleft, mild hypertelorism, absence of the nasal medial process of the nose, and frontonasal encephalocele. Cranial and plastic surgeries were performed to correct hypertelorism and improve the esthetic appearance of the frontonasal region. In the permanent dentition, the patient presented a Class II, division 1 malocclusion with severe maxillary constriction and bilateral posterior crossbite.
View Article and Find Full Text PDFProgress in understanding the infrared spectrum of the H2O-O2 dimer.
J Chem Phys
January 2025
Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta T2N 1N4, Canada.
Spectra of the weakly bound H2O-O2 dimer are studied in the region of the H2O ν2 band using a tunable quantum cascade laser to probe a pulsed supersonic slit jet expansion. These are the first gas-phase infrared spectra of H2O-O2 and among only a few such results for O2-containing complexes. Almost 100 infrared lines are assigned based on the ground state combination differences from the microwave spectrum of H2O-O2.
View Article and Find Full Text PDFAdvanced Analysis of Clay Microporosity Using High-Resolution N-Ar Adsorption Isotherms Coupled with the Derivative Isotherm Summation Method.
Molecules
December 2024
IMT Atlantique, GEPEA, UMR CNRS 6144, F-44307 Nantes, France.
The textural properties of synthetic and natural clays in the sodium form and exchanged with tetramethylammonium cations (TMA) were characterized using N and Ar physisorption isotherms at cryogenic temperatures. Specific surface areas and micro/mesoporous volumes were determined using the BET and the models. The analysis requires the use of reference isotherms measured at the same temperature on the surface of non-porous materials with an identical chemical composition.
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