Effect of Negative Pressure Vacuum Air Cushion in Precise Radiotherapy / 医疗卫生装备

ABSTRACT

Objective To discuss the clinical value and existing problems of the fixation technology of negative pressure vacuum bag in tumor precise radiotherapy.Methods The fixation technology of vacuum bag was utilized.The relations between the vacuum-bag and the body were marked by laser beam.The corresponding parts in the patient were linked with vacuum-bag by marks for the repetition of patient's body posture.The confirmation method was used to compare the target areas measured by radiation field scale before and after the body position projection.Results The repeatability errors of patient's body posture was not more than 2 mm.The position error at 0? was not more than 2 mm.The average error between the light depth of the suitable shape under the simulator to the treatment plan was 2-3mm.Conclusion It is indicated that in the development of tumor precise radiotherapy process,errors are obviously reduced by using the vacuum air cushion to fix body posture.This method should be applied widely for its high clinical value.