Comparison of maximum entropy and filtered back-projection methods to reconstruct rapid-scan EPR images
نویسندگان
چکیده
منابع مشابه
Rapid-scan EPR imaging.
In rapid-scan EPR the magnetic field or frequency is repeatedly scanned through the spectrum at rates that are much faster than in conventional continuous wave EPR. The signal is directly-detected with a mixer at the source frequency. Rapid-scan EPR is particularly advantageous when the scan rate through resonance is fast relative to electron spin relaxation rates. In such scans, there may be o...
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A new way to discretize the filtered back-projection (FBP) algorithm is presented. The function basis is the Haar system (2D product of rectangular windows). This scheme allows one to derive the optimal shape of the apodisation window, which is angle varying, and the oversampling ratio between the pixel and the projection cell size. The discrete equivalent filter is also derived. The comparison...
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Maximum entropy methods have proven to be a powerful tool for reconstructing data from incomplete measurements or in the presence of noise. In this note, we apply the method to the reconstruction computed tomography data derived from backprojection over a finite set of angles. In this case, one derives quite simple formulae which may be easily implemented on computer.
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15 صفحه اولRapid-scan EPR of immobilized nitroxides.
X-band electron paramagnetic resonance spectra of immobilized nitroxides were obtained by rapid scan at 293 K. Scan widths were 155 G with 13.4 kHz scan frequency for (14)N-perdeuterated tempone and for T4 lysozyme doubly spin labeled with an iodoacetamide spirocyclohexyl nitroxide and 100 G with 20.9 kHz scan frequency for (15)N-perdeuterated tempone. These wide scans were made possible by mod...
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ژورنال
عنوان ژورنال: Journal of Magnetic Resonance
سال: 2007
ISSN: 1090-7807
DOI: 10.1016/j.jmr.2006.09.027