Proton CT could ease treatment planning

Proton therapy planning is currently performed based on X-ray CT (xCT) images of the clinical target. This approach introduces errors to the range calculation, however, due to uncertainties when converting CT Hounsfield units to the water equivalent length (WEL) needed for dose calculation during planning. To mitigate this problem, researchers in Japan have constructed and measured the performance of a proton CT (pCT) imaging system.