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Double bowtie design for high sensitivity pediatric spectral CT.
Conf Proc Int Conf Image Form Xray Comput Tomogr
August 2024
Department of Radiology, Perelman School of Medicine, Philadelphia, PA USA.
Despite the evident benefits of spectral computed tomography (CT) in delivering qualitative imaging superior to that of conventional CT in adults, its application in pediatric diagnostic imaging is still relatively limited due to various reasons, including design limitations and radiation dose considerations. The use of specialized K-edge filters, in conjunction with other spectral technologies, has been demonstrated to improve spectral quantification accuracy. X-ray flux limitations generally pose challenges in these concepts when applied to adults.
View Article and Find Full Text PDFNovel Self-Powered Sensitive X-Ray Detection Crystal BiMoWO with Effective Functional Motif Coupling in a Quasi-2D Perovskite Structure.
Small
January 2025
State Key Laboratory of Crystal Materials, Shandong University, 27th South Shanda Road, Jinan, 250100, China.
The demand for medical imaging with reduced patient dosage and higher resolution is growing, driving the need for advanced X-ray detection technologies. This paper proposes a design paradigm for X-ray detection semiconductors by coupling constituent motifs through crystal structure engineering. The study introduces a strongly anisotropic Aurivillius-type quasi-2D perovskite structure, combining [BiO] groups with stereochemically active lone pair electrons (SCALPEs) and [W/MoO] anionic groups, enabling enhanced X-ray Compton scattering and self-powered capabilities through local electric field ordering.
View Article and Find Full Text PDFIn-situ gamma-ray measurement to estimate depth distribution of Cs in farmland in Fukushima Prefecture.
J Environ Radioact
January 2025
Hama Agricultural Regeneration Research Centre, Fukushima Agricultural Technology Center, Minami-soma, Fukushima, 975-0036, Japan.
Radioactive cesium released into the atmosphere caused by the Fukushima Dai-ichi Nuclear Power Plant accident in March 2011 has contaminated the surrounding area. We confirmed the applicability of in-situ methods to evaluate the depth distribution of Cs by employing the ratio of Compton-scattering and photo-peak components (r) obtained from measured gamma-ray spectra. In the present study, we applied the in-situ method to farmlands in Fukushima Prefecture whose sites were disturbed by decontamination and plowing operations.
View Article and Find Full Text PDFDesign and Test of a Calibration System for Avalanche Photodiodes Used in X-Ray Compton Polarimeters for Space.
Sensors (Basel)
December 2024
SCAI Connect s.r.l., Via Vincenzo Lamaro 51, 00173 Rome, Italy.
The development and calibration of a measurement system designed for assessing the performance of the avalanche photodiodes (APDs) used in the Compton scattering polarimeter of the CUSP project is discussed in this work. The designed system is able to characterize the APD gain GAPD and energy resolution across a wide range of temperatures (from -20 °C to +60 °C) and bias voltages Vbias (from 260 V to 410 V). The primary goal was to experimentally determine the GAPD dependence on the and Vbias in order to establish a strategy for stabilizing GAPD by compensating for fluctuations, acting on Vbias.
View Article and Find Full Text PDFA whole gamma imaging prototype for higher quantitative imaging ofZr-labeled antibodies in a tumor mouse model.
Phys Med Biol
January 2025
Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan.
Article Synopsis
- PET imaging using Zr is gaining traction for visualizing immune and cancer cells, but has limitations due to low image quality from gamma ray emissions.
- A new prototype has been developed to improve Compton imaging within PET by redesigning the scatter detector and optimizing image reconstruction methods.
- The upgraded WGI system showed enhanced imaging performance, including improved angular resolution, sensitivity, and reduced noise, demonstrating successful in-vivo imaging of a mouse with tumor burden after Zr labeled antibody injection.
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