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Study on customized polyurethane foam head and neck support in intensity-modulated radiotherapy for head and neck neoplasms using coneb-beam CT
Pages: 522-525
Year: Issue:  5
Journal: Radiologic Practice

Abstract: Objective:To study the superiority of customized polyurethane foam filled support for patient immobilization in intensity-modulated radiotherapy for head and neck neoplasms.Methods:92 patients with head and neck neoplasms were selected,for whom a total of 589 CBCT scans were performed.44 patients were immobilized by customized polyurethane foam head and neck support,for whom 252 scans of CBCT were collected;48 patients were immobilized by standard support,for whom 337 images of CBCT were collected.Elekta's XⅥ software was used to analyze setup errors.For the first three times,CBCT testing was made every day and the error results were analyzed and summarized to offer reference for later positioning and,if the same direction linear error greater than 1mm,it was revised and the positioning center was remarked.Later,CBCT testing was made each week to collect the setup errors of two groups of patients and to make data analysis.Results:In the customized head and neck support group,the linear error on X-,Y-and Z-axis was (0.85 ±0.68)mm,(1.17 ± 0.87)mm and (1.00 ± 0.81)mm respectively;the rotation error on X-,Y-and Z-axis was (0.52 ±0.45)°,(0.72±0.49)° and (0.57±0.47)° respectively.In the standard head and neck support group,on X-,Y-and Z-axis,the linear error was (1.15±0.90) mm,(1.48 ± 1.20)mm and (1.08 ± 0.81)mm respectively,the rotation error was (0.68 ± 0.52)°,(0.60 ± 0.44) ° and (0.77 ± 0.55) ° respectively.In the customized head and neck support group,the linear error on X-and Y-axis,and ration error on X axis was smaller than that in the standard group,indicating statistical signifant difference (P < 0.05).Before the summary,on Y-axis,the linear error of the standard pillow group was greater than the linear error after the summary,and for the customized pillow group,there was no difference before and after the summary.Conclusions:Compared with standard pillow,customized pillow can reduce the linear error on X-and Y-axis,and the rotation error on X-axis.The patient immobilization using customized pillow is stable.The repeatability of positioning is high,which makes the treatment more accurate and can be applied widely in clinical application.
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