Dual-energy CT for electron density measurements using clinical x-ray source

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Dual-energy computed tomography (DECT) has the potential for measuring electron density distribution in a human body to predict the range of particle beams for treatment planning in proton or heavy-ion radiotherapy. However, thus far, a practical dual-energy method that can be used to precisely determine electron density for treatment planning in particle radiotherapy has not been developed. In this study, another DECT technique involving a balanced filter method using a conventional x-ray tube has been proposed. From the viewpoint of beam hardening and the tube-loading efficiency, the DECT using balanced filters would be significantly more effective in measuring the electron density than the conventional DECT.