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

Abstract

Abstract 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 95%, but the Uniform group had a higher passing rate than the CT‐scan group. Conclusions Because the passing rate was higher in the Uniform group than in the CT‐scan group, it is recommended to use digital virtual phantom modules to generate verification plans in clinical practice.

Keywords

• computed tomography scan phantom
• Delta 4
• dose verification
• gamma analysis
• virtual digital phantom