The comparison of integral dose to normal structures between IMRT and VMAT techniques for prostate cancer
Keywords:
Prostate cancer, IMRT, VMAT, Integral doseAbstract
Background: The integral dose is the volume integral of the dose deposited in the treated volume. The energy and number of beams entry are directly effecting to the ID, especially the advance technique in radiotherapy.
Objective: To compare the integral dose (ID) of organ at risk (OAR) between IMRT and VMAT techniques by using 6MV and 15MV photon energy for prostate cancer.
Materials and Methods: Six prostate cancer patients were re-planned with IMRT and VMAT by using 6 MV and 15 MV. The plans were by using 6MV and 15MV photon energy. The prescription dose was 79.2 Gy in 44 fractions. The ID (mean dose ´ tissue volume) received by bladder, rectum, and normal tissue (NTID) was evaluated.
Results: The ID of bladder and rectum was not significantly different for both IMRT and VMAT techniques. However, VMAT showed higher NTID than IMRT with significant due to more incident beams than IMRT. For different energy, 15 MV showed lesser NTID than 6 MV with significantly. The monitor units (MU) to deliver for a single fraction was significantly reduced in VMAT technique.
Conclusion: The advantage of VMAT over IMRT was reducing the NTID. For 15 MV, the treatment time also reduced, which represent by MUs calculation.
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