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Knowledge of absolute photon energy spectrum is essential for image quality analysis and optimisation for any X-ray imaging method, for example, radiography and computerised tomography (CT). Conventional quantities such as half-value layer (HVL) and effective energy are easily calculated from...
All irradiated objects in the vicinity of an imaging set-up increase the amount of scattered radiation. It is a well-known fact that if this radiation is allowed to impinge on the image collector it naturally degrades the image quality. It also causes problems with equipment characterisation,...
A model will be proposed for predicting the expected value and variance of the measured signal-level in collected radiographic images obtained with an image-intensifier-based X-ray radiography system. The model parameters are determined from both theoretical and experimental data and incorporate...
It is of interest to know the minimum discernible detail size when performing non-destructive testing with high-resolution computerised tomography. But it is difficult to empirically find optimal parameter settings that maximise detectability for each individual imaging task. In this work a...
Conventional computerised tomography systems (CT) are usually equipped with polyenergetic X-ray sources, which prevents accurate density measurements because of the general CT-image artefact called beam hardening (BH). BH results in false gradients of the linear attenuation coefficient in the CT...
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