Aim of the study: Helical tomotherapy is

one of the methods of radiotherapy. This method enables treatment implemen-tation for a wide spectrum of clinical cas-es. The vast array of therapeutic uses of helical tomotherapy results directly from the method of dose delivery, which is sig-nificantly different from the classic method developed for conventional lin-ear accelerators. The paper discusses the method of dose delivery by a to-motherapy machine. Moreover, an analy-sis and presentation of treatment plans was performed in order to show the ther-apeutic possibilities of the applied tech-nology. Dose distributions were ob-tained for anaplastic medulloblastoma, multifocal metastases to brain, vulva can-cer, tongue cancer, metastases to bones, and advanced skin cancer. Tomothera-py treatment plans were compared with conventional linear accelerator plans. Results: Following the comparative analysis of tomotherapy and conven-tional linear accelerator plans, in each case we obtained the increase in dose distribution conformity manifested in greater homogeneity of doses in the ra-diation target area for anaplastic medul-loblastoma, multifocal metastases to brain, vulva cancer, metastases to bones, and advanced skin cancer, and the re-duction of doses in organs at risk (OAR) for anaplastic medulloblastoma, vulva cancer, tongue cancer, and advanced skin cancer. The time of treatment delivery in the case of a tomotherapy machine is comparable to the implementation of the plan prepared in intensity-modulated ra-diotherapy (IMRT) technique for a con-ventional linear accelerator. In the case of tomotherapy the application of a frac-tional dose was carried out in each case during one working period of the machine. For a conventional linear ac-celerator the total value of the fractional dose in the case of anaplastic medul-loblastoma and metastases to bones was delivered using several treatment plans, for which a change of set-up was nec-essary during a fraction. Conclusion: The obtained results confirm that tomotherapy offers the possibility to obtain precise treatment plans to-gether with the simplification of the ther-apeutic system