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This study aims to evaluate the effect of different air computed tomography (CT) numbers of the image value density table (IVDT) on the retrospective dose calculation of head-and-neck (HN) radiotherapy using TomoTherapy megavoltage CT (MVCT) images. The CT numbers of the inside and outside air and each tissue-equivalent plug of the "Cheese" phantom were obtained from TomoTherapy MVCT. Two IVDTs with different air CT numbers were created and applied to MVCT images of the HN anthropomorphic phantom and recalculated by Planned Adaptive to verify dose distribution. We defined the recalculation dose with MVCT images using both inside and outside air of the IVDT as

9-(2, 6, 6-Trimethyl-1-cyclohexen-1-yl)-3, 7-dimethyl-2, 4, 7-nonatrien-1, 6-diol, an important intermediate for synthesis of vitamin A acetate, has been synthesized directly by using a polyfunctional lithium reagent prepared by the action of lithium-arenes to the corresponding chloride.