Publications by authors named "R J Egli"
Objectives: To evaluate CT imaging findings in symptomatic patients with and without revision surgery (RS) after reverse shoulder arthroplasty (RSA).
Materials And Methods: In this retrospective study, two radiologists assessed CT imaging findings in symptomatic patients with RSA over 5 years, including material fracture and loosening of the peg, baseplate, screws, and humeral stem, screw positioning, prosthesis dislocation, glenoid notching, fractures, and deltoid muscle quality. The primary outcome parameter was RS.
Magnetotactic bacteria have evolved the remarkable capacity to biomineralize chains of magnetite [Fe(II)Fe(III)O] nanoparticles that align along the geomagnetic field and optimize their navigation in the environment. Mechanisms enabling magnetite formation require the complex action of numerous proteins for iron acquisition, sequestration in dedicated magnetosome organelles, and precipitation into magnetite. The MamP protein contains c-type cytochromes called magnetochrome domains that are found exclusively in magnetotactic bacteria.
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- Magnetotactic bacteria (MTB) utilize both magnetic field alignment and a chemotactic response to navigate to their ideal living depths in environments with varying chemical compositions.
- Current models of magneto-aerotaxis don’t accurately explain why some MTB are found below the oxic-anoxic interface or how different groups coexist at these depths despite their opposing magnetic polarities.
- A proposed new model suggests that MTB's magnetotactic behavior is influenced by specific gradients of oxygen and other substances, allowing them to navigate effectively across these gradients and adapt to varied ecological environments.
The estimation of BMD with CT scans requires a calibration method, usually based on a phantom. In asynchronous calibration, the phantom is scanned separately from the patient. A standardized acquisition protocol must be used to avoid variations between patient and phantom.
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- Digitally reconstructed radiographs (DRRs) are 2D images derived from 3D CT scans, aiding in pre-surgical planning, while C-arm fluoroscopy is commonly used during surgery but has a technical issue known as pincushion distortion.
- The study involved 3D-printed models and analyzed the correlation between DRRs, fluoroscopic images, and conventional X-rays using rotations from 0 to 90 degrees to evaluate accuracy.
- Results showed high correlation between DRRs and both X-ray (R 0.99) and C-arm images (R 0.95), with the highest structural similarity index (SSIM) between DRR and C-arm images, confirming DRRs as a reliable research tool in orthopedic imaging