Results 21 to 30 of about 236,819 (143)
On the Forward Scattering of Microwave Breast Imaging [PDF]
International Journal of Biomedical Imaging, 2012 Microwave imaging for breast cancer detection has been of significant interest for the last two decades. Recent studies focus on solving the imaging problem using an inverse scattering approach. Efforts have mainly been focused on the development of the inverse scattering algorithms, experimental setup, antenna design and clinical trials.
Lui, Hoi-Shun +2 more
openaire +4 more sources
Imaging Microwave and DC Magnetic Fields in a Vapor-Cell Rb Atomic Clock [PDF]
, 2015 We report on the experimental measurement of the DC and microwave magnetic field distributions inside a recently-developed compact magnetron-type microwave cavity, mounted inside the physics package of a high-performance vapor-cell atomic frequency standard.
arxiv +1 more source
Frequency-Tunable Microwave Field Detection in an Atomic Vapor Cell [PDF]
, 2016 We use an atomic vapor cell as a frequency tunable microwave field detector operating at frequencies from GHz to tens of GHz. We detect microwave magnetic fields from 2.3 GHz to 26.4 GHz, and measure the amplitude of the sigma+ component of an 18 GHz microwave field.
arxiv +1 more source
SAR Analysis of Directive Antenna on Anatomically Real Breast Phantoms for Microwave Holography [PDF]
Microwave and Optics Technology Letters, 2019, 2019 Microwave imaging is emerging as a promising substitution diagnostic tool, for breast cancer detection. It has ignited the interest in the interaction of the microwaves with biological tissues and their respective effects on the human body which requires the investigation of safety issues on human health under the exposure of antenna's microwave ...
arxiv +1 more source
Microwave Surveillance based on Ghost Imaging and Distributed Antennas [PDF]
, 2015 In this letter, we proposed a ghost imaging (GI) and distributed antennas based microwave surveillance scheme. By analyzing its imaging resolution and sampling requirement, the potential of employing microwave GI to achieve high-quality surveillance performance with low system complexity has been demonstrated. The theoretical analysis and effectiveness
arxiv +1 more source
Imaging of microwave fields using ultracold atoms [PDF]
Appl.Phys.Lett.97:051101,2010, 2010 We report a technique that uses clouds of ultracold atoms as sensitive, tunable, and non-invasive probes for microwave field imaging with micrometer spatial resolution. The microwave magnetic field components drive Rabi oscillations on atomic hyperfine transitions whose frequency can be tuned with a static magnetic field.
arxiv +1 more source
Ultra-wideband microwave imaging of heterogeneities [PDF]
Journal of Applied Geophysics, 2009 The technique of time-reversal acoustics was applied to image a bottle filled with saline, using an eight element Vivaldi antenna array with frequency bandwidth 2 to 8 GHz. At these short length scales, a smooth three-dimensional image of the bottle was obtained, with the usual limitations imposed by limited offset and frequency.
A. Cresp +7 more
openaire +6 more sources
Systematic Microwave Source Motions along Flare-arcade Observed by Nobeyama Radioheliograph and AIA/SDO [PDF]
, 2013 We found systematic microwave source motions along a flare-arcade using Nobeyama Radioheliograph (NoRH) 17 GHz images. The motions were associated with a X-class disk flare which occurred on 15th February 2011. For this study, we also used EUV images from Atmospheric Imaging Assembly (AIA) and magnetograms from Helioseismic and Magnetic Imager (HMI ...
arxiv +1 more source
Microwave Imaging under Oblique Illumination [PDF]
Sensors, 2016 Microwave imaging based on inverse scattering problem has been attracting many interests in the microwave society. Among some major technical challenges, the ill-posed, multi-dimensional inversion algorithm and the complicated measurement setup are critical ones that prevent it from practical applications.
Qingyang Meng +7 more
openaire +4 more sources
AMI Observations of the Anomalous Microwave Emission in the Perseus Molecular Cloud [PDF]
, 2013 We present observations of the known anomalous microwave emission region, G159.6-18.5, in the Perseus molecular cloud at 16 GHz performed with the Arcminute Microkelvin Imager Small Array. These are the highest angular resolution observations of G159.6-18.5 at microwave wavelengths. By combining these microwave data with infrared observations between 5.
arxiv +1 more source