Dosimetry Study of VAMT Planning Based onMonaco Treatment Planning System and Tomo Planning System Based on Helical Tomography in Volume-Modulated Intensity-Modulated Radiation Therapy for Cervical Cancer

Author(s): Mengyuan Si, Yuqin Wen, Ruiqiang Song

To compare and analyze the effects of VAMT plan based on Monaco treatment plan system and Tomo treatment plan system based on spiral tomography system on cervical cancer dosimetry. [Methods] Ten patients with cervical cancer who received cervical cancer radiotherapy from September 2017 to May 2018 were selected, using the VAMT plan based on MonacoTPS and the Tomo plan based on TomoHTMV2.0.5 TPS. Target dosimetry index, endangered organ dosimetry index, machine jumps, and patient treatment time. [Result] The conformity index CI of the target area of the TOMO plan is (0.85±0.02) and the uniformity index HI is (0.07± 0.01), which are better than the CI (0.80±0.01) and HI (0.10±0.01) of the VAMTMonaco plan. The difference is highly statistically significant (p <0.001). The TOMO plan has significantly reduced the V30 and V40 of OAR, especially for the bladder. The MU (6698±473) and DT (473±33) required for the TOMO plan were significantly larger than the MU (1655±101) and DT (167±16) for the VAMTMonaco plan, and the differences were highly statistically different (p <0.001). [Conclusion] Compared with the VAMTMonaco plan, the TOMO plan has better conformity and uniformity of the target area, and the normal tissues around the target area receive lower doses, which is better for protecting organs at risk, especially for bladder protection. However, in OARV20 and V10, VAMTMonaco plan is better than TOMO plan, and MU and DT are smaller than TOMO plan, and the treatment rate is higher than TOMO plan. From a dosimetric point of view, using the TOMO plan under certain conditions is a better choice.

Cervical Cancer, Spiral Tomography, Volume Rotation Intensity Modulation, Dosimetry

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