7 research outputs found
Today’s advanced is tomorrow’s basic
https://deepblue.lib.umich.edu/bitstream/2027.42/145431/1/13089_2018_Article_100.pd
Feasibility study of advanced focused cardiac measurements within the emergency department
Abstract
Background
This study aims to compare the increased time needed to perform advanced focused cardiac measurements in the emergency department, including diastolic heart failure evaluation via E/E′, and cardiac output with LVOT/VTI. Patients with pertinent cardiopulmonary symptoms in the emergency department had a focused cardiac ultrasound performed by the emergency department ultrasound team. The ability to obtain basic cardiac windows, evaluate for effusion, systolic ejection fraction, and right-sided heart pressures were recorded. Advanced measurements, along with time to obtain all images and the training level of the provider, were recorded.
Results
Fifty-three patients were enrolled. Basic focused cardiac windows were able to be obtained in 80% of patients. The average 4-window focused cardiac ultrasound took 4Â min and 49Â s to perform. Diastolic measurements were able to be obtained in 51% of patients, taking an average of 3Â min and 17Â s. Cardiac output measurements were able to be obtained in 53% of patients, taking an average of 3Â min and 8Â s.
Conclusion
The ability to obtain these images improved with increasing level of training. Performing both cardiac output and diastolic measurements increased the time with bedside ultrasound by 6Â min and 25Â s, and were able to be obtained in slightly over half of all ED patients.https://deepblue.lib.umich.edu/bitstream/2027.42/143847/1/13089_2018_Article_93.pd
Dynamical theory calculations of spin-echo resolved grazing-incidence scattering from a diffraction grating
Neutrons scattered or reflected from a diffraction grating are subject to a periodic potential analogous to the potential experienced by electrons within a crystal. Hence, the wavefunction of the neutrons can be expanded in terms of Bloch waves and a dynamical theory can be applied to interpret the scattering phenomenon. In this paper, a dynamical theory is used to calculate the results of neutron spin-echo resolved grazing-incidence scattering (SERGIS) from a silicon diffraction grating with a rectangular profile. The calculations are compared with SERGIS measurements made on the same grating at two neutron sources: a pulsed source and a continuous wave source. In both cases, the spin-echo polarization, studied as a function of the spin-echo length, peaks at integer multiples of the grating period but there are some differences between the two sets of data. The dynamical theory explains the differences and gives a good account of both sets of results. © 2010, Wiley-Blackwell