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Enhancing time-resolution for radon measurements using airflow-through scintillation cells based on a compartmental model approach.
Radiat Prot Dosimetry
November 2024
Shanghai Institute of Measurement and Testing Technology, 1500 Zhang-Heng Road, Shanghai 201203, China.
To overcome the time-resolution limitation inherent in the airflow-through scintillation cell method for radon measurement, this study introduces a compartmental model elucidating the behaviors of radon and its progeny within such cells. The computed results of the normalized equilibrium functions derived from the compartmental model, provide quantitative insights into the equilibrium progression of 222Rn and its progeny over time, substantiating the identified time-resolution limitation of 2-3 hours. Laboratory experiments confirm the efficacy of the proposed correction algorithm, showcasing its ability to surmount the time-resolution limitation and achieve a rapid response in radon measurement using airflow-through scintillation cells.
View Article and Find Full Text PDFImprovements on speed, stability and field of view in adaptive optics OCT for anterior retinal imaging using a pyramid wavefront sensor.
Biomed Opt Express
October 2024
Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Wien, Austria.
We present improvements on the adaptive optics (AO) correction method using a pyramid wavefront sensor (P-WFS) and introduce a novel approach for closed-loop focus shifting in retinal imaging. The method's efficacy is validated through adaptive optics optical coherence tomography (AO-OCT) imaging in both, healthy individuals and patients with diabetic retinopathy. In both study groups, a stable focusing on the anterior retinal layers is achieved.
View Article and Find Full Text PDFUnlabelled: This research article elucidates the pivotal role of radiopharmacy in the contemporary landscape, underscoring its potential therapeutic efficacy in addressing symptoms associated with aged-related neurocognitive processes. Clinical trials, characterized by the judicious application of modest radiation doses, exemplified by low-dose radon, have yielded affirmative outcomes in the amelioration of aged, related symptoms.
Material And Methods: The study was conducted on an animal model.
Efficacy of zeolites in radon adsorption: state of the art and development of an optimized approach.
Isotopes Environ Health Stud
August 2024
Department of Physics "Ettore Pancini", University of Naples Federico II, Naples, Italy.
Radon is a radioactive noble gas omnipresent in the environment, being part of the U and Th decay chains present in the Earth's crust. The gas can easily leak through the ground but also be present in natural construction materials and migrate into indoor places where it can be a carcinogen when inhaled. Studying the content and removal of indoor radon is crucial for the evaluation and mitigation of its radiological risks to public health.
View Article and Find Full Text PDFA transcranial multiple waves suppression method for plane wave imaging based on Radon transform.
Ultrasonics
September 2024
Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China.
Transcranial ultrasound imaging presents a significant challenge due to the intricate interplay between ultrasound waves and the heterogeneous human skull. The skull's presence induces distortion, refraction, multiple scattering, and reflection of ultrasound signals, thereby complicating the acquisition of high-quality images. Extracting reflections from the entire waveform is crucial yet exceedingly challenging, as intracranial reflections are often obscured by strong amplitude direct waves and multiple scattering.
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