Y-ray computed tomography

Nedeltchev et al. 2003 Shaikh and Al-Dahhan 2010) y-ray computed tomography (CT) (Shaikh and Al-Dahhan 2005)... 

Zeng, Y., C.J. Gantzer, and S.H. Anderson. 1996. Fractal dimension and lacunarity of bulk density determined with x-ray computed tomography. Soil Sci. Soc. Am. J. 60 1718... 

Masuda Y, Yoshida H, Morooka N, Watanabe S, Inagaki Y (1984) The usefulness of X-ray computed tomography for the diagnosis of myocardial infarction. Circulation 70 217-225... 

By comparing values from this approach with those obtained by other methods, e.g., quick-closing valves (Arena et al., 1986), y-ray absorption (Hartge et al., 1986a Azzi et al., 1991), or x-ray computed tomography (Grassier and Wirth, 1999), this approach has been shown to give reasonably accurate measurements. However, correetions may be needed in some cases ... 

Kim, D Park, S., Lee, J.H., Jeong, Y.Y. and)on, S. (2007) Antibiofouling polymer-coated gold nanopartides as a contrast agent for in vivo X-ray computed tomography imaging. Journal of the American Chemical Sodety, 129, 7661-5. 

Neutron or y Sensors Neutron- or y -based sensors are similar in concept to the X-ray sensors. They use different forms of excitation and different detectors, but the basic forms of transmission or backscatter follow the pattern described above. Both normally rely on extensive computation for signal processing called computed tomography, where the detector signals are combined to synthesize an image of the irradiated object. 

In situ quantification of Gd is achieved after irradiation with a cold neutron beam through a burr hole. Prompt y-rays are then monitored using a germanium scintillation counter. In the future, this method may be used with computed tomography to visualize the quantitative distribution of 5 Gd and °B [14]. 

When the body is radiated by Roentgen rays, these rays will be partly absorbed by tissues in the body. This property is defined by a attenuation coefficient //. Received rays form a set of projections p(4>9 that are used to reconstract the internal stracture of the body. Therefore, the basic problem of Roentgen computed tomography is to represent the linear absorption coefficient x,y) through a set of projections p(4,9 (The diagram of Roentgen computed tomogra-... 

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