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KMID : 1038720180290040157
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Progress in Medical Physics
2018 Volume.29 No. 4 p.157 ~ p.163
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Dosimetric Evaluation of Plans Converted with the DVH-Based Plan Converter
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Chun Min-Soo
Choi Chang-Heon
Kim Jung-In
Yoon Jeong-Min
Lee Sung-Young
Kwon O-Hyun
Son Jae-Man
An Hyun-Joon
Kang Seong-Hee
Park Jong-Min
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Abstract
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Plans converted using dose-volume-histogram-based plan conversion (DPC) were evaluated by comparing them to the original plans. Changes in the dose volumetric (DV) parameters of five volumetric modulated arc therapy (VMAT) plans for head and neck (HN) cancer and five VMAT plans for prostate cancer were analyzed. For the HN plans, the homogeneity indices (HIs) of the three planning target volumes (PTV) increased by 0.03, 0.02, and 0.03, respectively, after DPC. The maximum doses to the PTVs increased by 1.20, 1.87, and 0.92 Gy, respectively, after DPC. The maximum doses to the optic chiasm, optic nerves, spinal cord, brain stem, lenses, and parotid glands increased after DPC by approximately 4.39, 3.62, 7.55, 7.96, 1.77, and 6.40 Gy, respectively. For the prostate plans after DPC, the HIs for the primary and boost PTVs increased by 0.05 and 0.03, respectively, and the maximum doses to each PTV increased by 1.84 and 0.19 Gy, respectively. After DPC, the mean doses to the rectum and femoral heads increased by approximately 6.19 and 2.79 Gy, respectively, and those to the bladder decreased by 0.20 Gy when summing the primary and boost plans. Because clinically unacceptable changes were sometimes observed after DPC, plans converted by DPC should be carefully reviewed before actual patient treatment.
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KEYWORD
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DVH-based plan converter, Volumetric modulated arc therapy, Step-and-shoot IMRT, Dose-volumetric parameters, Plan quality
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