Comparative analysis of dose verification between computed tomography scan phantom and virtual digital phantom of Delta4

• Published in: Precision radiation oncology 2020-06, Vol.4 (2), p.38-43
• Main Authors: Liu, Ting‐Ting, Dai, Zhi‐Tao, Kang, Kai‐Lian, Gao, Li‐Ying, Liu, Rui‐Feng, Ou‐Yang, Shui‐Gen
• Format: Article
• Language: English
• Subjects: Cancer therapies; computed tomography scan phantom; Delta 4; Diodes; dose verification; Dosimetry; gamma analysis; Medical imaging; Patients; Planning; Polymethyl methacrylate; Sensors; Software; Statistical analysis; virtual digital phantom
• ISSN: 2398-7324; 2398-7324
• DOI: 10.1002/pro6.1092

Objective This study compared the dose verification results between plans created based on computed tomography (CT) scan and digital virtual phantom. Methods We retrospectively analyzed the treatment plan of 10 patients with head and neck cancer. CT scanned phantom and digital virtual phantom measured using Delta4 3‐D matrix were used to generate verification plans for each patient. The doses based on the effective measurement volume of the two phantoms were compared, and the verification results were analyzed using gamma index analysis. Results For the body, the minimum dose, the maximum dose, the average dose, and the total dose were 0.72 ± 0.46 cGy, 251.86 ± 49.83 cGy, 58.10 ± 10.93 cGy, and 154.67 ± 20.28 cGy, respectively, in the CT‐scan group, and 0.62 ± 0.36 cGy, 248.34 ± 48.59 cGy, 57.20 ± 10.77 cGy, and 151.57 ± 19.73 cGy, respectively in the Uniform group. The difference between the groups was significant (P