In:
Precision Radiation Oncology, Wiley, Vol. 4, No. 2 ( 2020-06), p. 38-43
Abstract:
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 〈 0.05). In the Delta4 analysis software, the dose deviation, distance to agreement, and gamma passing rates were 73.39 ± 10.75%, 95.25 ± 1.00%, and 96.67 ± 1.415%, respectively in the CT‐scan group, and 83.36 ± 10.15%, 98.61 ± 0.810%, and 99.38 ± 0.452%, respectively, in the Uniform group. The two plans were significantly different ( P 〈 0.05), and there was a 3% difference in the gamma passing rate. Therefore, the conclusions relating to the examined dose applied, the groups were significantly higher than those of CT‐scan groups. (both P ‐values were 〈 0.05). As the parameter value increases, the difference decreases. In the 3 mm/3% standard, both groups met the clinical requirement of gamma passing rate of 〉 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.
Type of Medium:
Online Resource
ISSN:
2398-7324
,
2398-7324
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
2899107-2
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