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Background: Attenuation correction (AC) is being extended to small field-of-view (FOV), dedicated cardiac SPECT systems. Transmission scan based attenuation maps of larger patients produced by these systems may exhibit truncation artifacts. It has been assumed that truncation artifacts within the 180 o acquisition arc will have a negative impact on AC. However, this assumption has not been...
We have studied monolayer and multilayer Langmuir-Blodgett films of lead stearate and cadmium stearate using grazing incidence X-ray diffraction. We find that although these two types of films have similar in-plane structures, lead stearate forms better ordered films: the correlation length increases with the number of layers in lead stearate but levels off at the three-layer value in cadmium stearate...
We have studied Langmuir monolayers of saturated fatty acid-alcohol mixtures (same chain length) and acid-acid mixtures (different chain length) using isotherms and X-ray diffraction. The diffraction data confirm that the constituents are miscible, and that at zero pressure the mixed acid-alcohol monolayer areas are less than the areas of the pure components. We have determined the phase diagrams...
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