PMID- 28517082 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20191120 IS - 2473-4209 (Electronic) IS - 0094-2405 (Linking) VI - 39 IP - 6Part19 DP - 2012 Jun TI - SU-E-T-595: Comparison of Volumetric Modulated Arc Therapy (VMAT) and Static Intensity Modulated Radiotherapy (IMRT) for Malignant Pleural Mesothelioma in Patients with Intact Lungs/Post Pleurectomy. PG - 3842 LID - 10.1118/1.4735684 [doi] AB - PURPOSE: This planning study compares VMAT and static gantry, sliding window IMRT for malignant pleural mesothelioma for post pleurectomy. METHODS: We compared plans for a left sided (L) and a right sided case (R). Plans used clinically approved planning target volumes (PTVs) and critical organ contours. IMRT plans employed 7-8 6 MV photon beam directions over a 215 degrees range centered on the ipsilateral lung. VMAT plans used 4 partial arcs within the same range and energy. Prescription dose per fraction was 1.8 Gy; case L went to 50.4 Gy, case R to 46.8 Gy. Planning objectives were: Lyman model NTCP for both lungs < 25%; contralateral lung, mean dose < 8 Gy; heart, V30 Gy < 50%, mean < 30 Gy; Each Kidney, V18 Gy < 33%; liver_not_GTV, mean < 30 Gy, V30 Gy < 50%; stomach not PTV, mean < 30 Gy; cord maximum < 45 Gy; bowel maximum < 55 Gy, D05 < 45 Gy; PTV D95 = 94%, V95 = 94%, D05 = 115%. Dose calculation was done with the AAA algorithm. RESULTS: VMAT and IMRT both met the dosimetric constraints. The VMAT MU were 887 (L)_and 896 (R) and for IMRT were 1691 (L) and 2409 (R). IMRT required 14-16 fields (wide-field splitting). The delivery times were 8 minutes (VMAT) and 20 minutes (IMRT). For coverage and plan homogeneity parameters within 1.5% - 2%, VMAT better spared organs at risk. CONCLUSIONS: Both VMAT and IMRT are feasible techniques for the treatment of malignant pleural mesothelioma with intact lungs, with less MU and a shorter delivery time for VMAT. Additional cases must be planned to test generality of our preliminary results. CI - (c) 2012 American Association of Physicists in Medicine. FAU - Dumane, V AU - Dumane V AD - The Mount Sinai Medical Center. AD - Memorial Sloan-Kettering Cancer Center, New York, NY. AD - Memorial Sloan-Kettering Cancer Center, New York, NY. AD - The Mount Sinai Medical Center. FAU - Yorke, E AU - Yorke E AD - The Mount Sinai Medical Center. AD - Memorial Sloan-Kettering Cancer Center, New York, NY. AD - Memorial Sloan-Kettering Cancer Center, New York, NY. AD - The Mount Sinai Medical Center. FAU - Rimner, A AU - Rimner A AD - The Mount Sinai Medical Center. AD - Memorial Sloan-Kettering Cancer Center, New York, NY. AD - Memorial Sloan-Kettering Cancer Center, New York, NY. AD - The Mount Sinai Medical Center. FAU - RosenzweigG, K AU - RosenzweigG K AD - The Mount Sinai Medical Center. AD - Memorial Sloan-Kettering Cancer Center, New York, NY. AD - Memorial Sloan-Kettering Cancer Center, New York, NY. AD - The Mount Sinai Medical Center. LA - eng PT - Journal Article PL - United States TA - Med Phys JT - Medical physics JID - 0425746 OTO - NOTNLM OT - Anatomy OT - Dosimetry OT - Heart OT - Intensity modulated radiation therapy OT - Kidneys OT - Lungs OT - Photons EDAT- 2012/06/01 00:00 MHDA- 2012/06/01 00:01 CRDT- 2017/05/19 06:00 PHST- 2017/05/19 06:00 [entrez] PHST- 2012/06/01 00:00 [pubmed] PHST- 2012/06/01 00:01 [medline] AID - 10.1118/1.4735684 [doi] PST - ppublish SO - Med Phys. 2012 Jun;39(6Part19):3842. doi: 10.1118/1.4735684.