Why is skin dose different to absorbed dose in air? Although in some cases we are interested in skin dose, most radiographic equipment reports the radiation output in air. In this post, we explore why the absorbed dose in air is different to that on the patient’s skin and what factors we must look out […]
Discuss the two primary methods of X-ray interactions in diagnostic radiology. The theory X-rays interact with matter differently based on the energy of the photon and the atomic number of the material in which the interactions take place. The difference in interactions results in subject contrast in radiology. The two main types of interactions […]
Discuss what is meant by Deterministic Effects and Stochastic Effects. The theory High doses of ionising radiation have adverse health effects on the exposed individuals. The effects are categorised into two groups: stochastic effects and deterministic effects. Stochastic Effect Stochastic effects are random occurrences and show up as cell mutations rather than cell death. The […]
Explain CTDI, its different forms and how it is measured? The theory The computed tomography dose index (CTDI) is a measure of the radiation output of a CT scanner (typically in a standard acrylic phantom, but sometimes reported in air). It is important to note that this is NOT a measure of patient dose. […]
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