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The two principal imaging modalities for study of paediatric gastrointestinal tract (GIT) function are scintigraphy and radiology. They differ in many respects, but their clearest common feature is that both use ionising radiation, hence both result in an absorbed radiation dose per unit mass of tissue (D). D is deleterious if too large. There is no single value denoting acceptable levels of D, as tissue sensitivity varies. So all imaging should be undertaken after consideration of its benefits and risks, although the former are difficult to quantify,' Emphasis here is on quantitation ofD, for it is important to know this value at different sites. There are significant differences between paediatric and adult patients when considering dosimetry. The former live longer, so are subject to greater risk of any late manifestations of radiation. Paediatric organs have age-dependent mass ratios, which can differ from those of adults, most especially for brain, testes and adrenals. An additional important determinant is the increased sensitivity to ionising radiation of some paediatric tissues, especially tissues associated with reproduction and rapid growth. Uptake and retention of radiopharmaceuticals in different organs may exhibit different physiology from that of adults (most notably in the growth areas oflong bones). Hence dosimet ric considerations in paediatrics are not those of miniature adults.

Dosimetry of paediatric radiological and scintigraphic studies of the foregut