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Fast Fourier digital quantum mottle analysis with application to rare earth intensifying screen systems

Medical Physics 1977年第2期4卷 157-162页

作者： Wagner, Robert F. Division of Electronic Products Bureau of Radiological Health FDA Rockville Maryland 20852 United States

The advent of fast Fourier techniques has greatly facilitated the digital analysis of noise power spectra (Wiener spectra) by circumventing the need for the autocorrelation function. We are now able to Fourier analyze film data at about the same rate the microdensitometer–computer system can collect it (1000 points/sec). The new technique has been applied to the analysis of the quantum mottle of several rare earth intensifying screen systems confirming earlier estimates from our pilot studies that such screens are capable of reducing exposure by a factor of about 2 with imaging parameters comparable to those of conventional calcium tungstate systems. © 1977, American Association of Physicists in Medicine. All rights reserved.

关键词： modulation and optical transfer functions Fourier analysis Acoustic noise measurement Spectrum analysis Data analysis Quantum noise Image analysis Calcium

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X ray transmission computed tomography

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Medical Physics 1977年第2期4卷 85-98页

作者： Mccullough, Edwin C. Payne, J. Thomas Mayo Clinic/Foundation Rochester Minnesota 55901 United States University of Minnesota Minneapolis Minnesota 55455 United States

The immediate goal of clinically based x ray transmission computed tomography (CT) is to provide a measurement of the x ray linear attenuation coefficient in cross section with the ultimate goal of impacting on patient managerment and care. To do this with the accuracy needed for clinical goals requires the careful integration of x ray physics, detector technology, and mathematical reconstruction theory. Performance evaluation and quality assurance are necessary adjuncts to a CT scanning program. A number of investigative studies are under way. © 1977, American Association of Physicists in Medicine. All rights reserved.

关键词： modulation and optical transfer functions Computed tomography Quality assurance

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