For the first time in the field of medical imaging, harmonious use of Z-contrast imaging and digital image processing was developed as an analytical imaging tool and demonstrated in studying human and rabbit spermatozoa. The biological information generated is unique to the science of medical imaging. The versatility of its applications is wide as this advance in imaging technology can be applied to any area of medicine involving tissue analysis. Tissue analysis plays a vital role in both medical research and diagnostic patient care. Imaging in the Z-contrast mode of the scanning-transmission electron microscope affords biologists the capability to image tissue in its natural state such that heavy metal fixatives and stains are not used. The digitally processed Z-contrast image is not only devoid of artifacts caused by fluctuating mass-density, topography variations, and the addition of heavy metal contrast agents but also offers a biological blueprint of the atomic weight distribution in the tissue. The varying gray level intensities assigned to each pixel in the resulting image are specific to the average atomic weight differences inherent in the tissue. The advent of complementary Z-contrast imaging and digital image processing and their concomitant research possibilities offers areas of medical care and medical research an invaluable imaging tool.
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http://dx.doi.org/10.1016/0169-2607(86)90009-x | DOI Listing |
JACS Au
December 2024
Department of Materials Design Innovation Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Aichi, Japan.
Controlling the nucleation, growth, and dissolution of Li is crucial for the high cycling stability in rechargeable Li metal batteries. The overpotential for Li nucleation (η) on Li alloys such as Li-Au is generally lower than that on metal current collectors (CCs) with very limited Li solubility like Cu. However, the alloying process of CC and its impact on the Li nucleation kinetics remain unclear.
View Article and Find Full Text PDFInorg Chem
March 2024
Materials Research Centre, Indian Institute of Science, Bangalore 560 012, Karnataka, India.
One-dimensional nanostructures, with a high ratio of surface-bulk atoms, find applications as active catalysts. Here, we report tunability in ultrathin single-crystalline AuPdPt nanowires by modifying synthesis conditions and postsynthetic treatment in a controlled ambient atmosphere. The surface microstructure modification of these nanostructures has been analyzed by integrating the results of three crucial techniques including Z-contrast HAADF-STEM imaging, X-ray photoelectron spectroscopy, and electrochemically active surface area from cyclic voltammograms.
View Article and Find Full Text PDFPhys Med Biol
February 2024
Department of Physics and Astronomy, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada.
Computed tomography (CT) has advanced since its inception, with breakthroughs such as dual-energy CT (DECT), which extracts additional information by acquiring two sets of data at different energies. As high-flux photon-counting detectors (PCDs) become available, PCD-CT is also becoming a reality. PCD-CT can acquire multi-energy data sets in a single scan by spectrally binning the incident x-ray beam.
View Article and Find Full Text PDFBiomed Phys Eng Express
October 2023
Los Alamos National Laboratory, Los Alamos, NM, 87545, United States of America.
Proton Radiography can be used in conjunction with proton therapy for patient positioning, real-time estimates of stopping power, and adaptive therapy in regions with motion. The modeling capability shown here can be used to evaluate lens-based radiography as an instantaneous proton-based radiographic technique. The utilization of user-friendly Monte Carlo program TOPAS enables collaborators and other users to easily conduct medical- and therapy- based simulations of the Los Alamos Neutron Science Center (LANSCE).
View Article and Find Full Text PDFUltramicroscopy
December 2023
EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. Electronic address:
Electron ptychography provides highly sensitive, dose efficient phase images which can be corrected for aberrations after the data has been acquired. This is crucial when very precise quantification is required, such as with sensitivity to charge transfer due to bonding. Drift can now be essentially eliminated as a major impediment to focused probe ptychography, which benefits from the availability of easily interpretable simultaneous Z-contrast imaging.
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