Study and Compare the Application Value of Three Image Automatic Registration Techniques in Detecting Positioning Deviation in Radiotherapy for Head and Neck Tumors
Objective:To compare and analyze the value of applying three image automatic registration techniques in detecting positioning deviation in radiotherapy for head and neck tumors.Methods:21 patients with head and neck tumors were selected to simulate localization and develop a radiotherapy plan before radiotherapy,detect positioning offsets,and perform image registration.The registration errors and registration times of kilovolt level digital X-ray radiography(KVDR),cone beam computed tomography(CBCT),and Electronic Field Imaging Device(EPID)were compared on 3mm,5mm,7mm,9mm and 12mm positioning offsets.Results:The registration error differences of KVDR,CBCT,and EPID at 3mm,5mm,7mm,9mm and 12mm positioning offsets were statistically significant(P<0.05).Compared with KVDR and EPID,CBCT had the worst registration accuracy and the difference was statistically significant(P<0.05).The difference in registration time among KVDR,CBCT,and EPID was statistically significant,with EPID having the highest registration efficiency,followed by KVDR and CBCT(P<0.05).Conclusion:The EPID image guided radiotherapy positioning system has the highest registration efficiency in positioning deviation detection,and the registration accuracy is slightly lower than KVDR.
head and neck tumorsautomatic image registration technologyradiation therapypositioning deviation detectionregistration accuracy
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