With the final aim of achieving iodine contrast-enhanced cancer screening examinations with low dose exposure, we reconstructed tomographic images of material distributions from X-ray transmission measurements obtaine...
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With the final aim of achieving iodine contrast-enhanced cancer screening examinations with low dose exposure, we reconstructed tomographic images of material distributions from X-ray transmission measurements obtained from a small number of measurement directions. This method used a planar-type four-channel 'transXend' detector. The phantom was subjected to four different X-ray spectra tailored by filters, and the X-rays were measured by a flat panel detector. The X-ray attenuation by the phantom was reproduced according to attenuations by acrylic, iodine, and aluminum, which acted as substitutes for normal tissue, iodine contrast agent, and bone, respectively. The material thickness distributions obtained were used for tomographic image reconstruction of the material distribution. The quality of iodine tomographic images is discussed as a function of the number of measurement directions.
Measurement of liquid level;survey includes floats, visual indicators, pressure type level gages, differential pressure type transmitters and capacitance type measurement;float-and-lever type of designs are best suite...
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Measurement of liquid level;survey includes floats, visual indicators, pressure type level gages, differential pressure type transmitters and capacitance type measurement;float-and-lever type of designs are best suited for small changes in levels;visual indicators are very common for indication of liquid level on tanks where large changes are to be observed;pressure type level gages are very suitable for large tanks with corrosive liquids;differential pressure type transmitters can be used in closed tanks under pressure;capacitance type measurement is used in liquid chlorine tanks.
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