Gagne has described a model for predicting the sensitivity and dose profiles in the slice-width direction for computed tomography (CT)scanners. Comparison of simulated and measured dose data provides experimental validation of the model, including verification of the superior match to the penumbra provided, as well as the observable effects on the cumulative dose distribution. An original goal was the development of an analytical model for simulating the quasi-periodic helical dose distribution on the peripheralphantom axes; this being motivated in part to facilitate the implementation of an improved method of CT dose measurement utilizing a short ion chamber originally proposed by R. L. Dixon. The analytical nature of the model has led to the formulation of some fundamental physical principles governing CT.