Re: Fractions vs. One shot accuracy. Your point is absolutely correct in the case of most of the LINAC machines which are classified as radiotherapy. Their lesser accuracy and the challenge of consistently repeating the same mask placement each treatment is the main reason that treatment plans are for very low doses over 25-30 days. This approach actually delivers a larger cumulative GY dose than GK / CK do in the one shot or 3 fraction higher dose protocol. CK would be the exception to the repetitive accuracy issue since it is the only machine that actively targets the tumor during treatment. The trade off one could argue is that there is additional X-ray exposure in this process.