Institutional experience with SRS VMAT planning for multiple cranial metastases

Journal of Applied Clinical Medical Physics
Åse BallangrudJames Mechalakos

Abstract

This study summarizes the cranial stereotactic radiosurgery (SRS) volumetric modulated arc therapy (VMAT) procedure at our institution. Volumetric modulated arc therapy plans were generated for 40 patients with 188 lesions (range 2-8, median 5) in Eclipse and treated on a TrueBeam STx. Limitations of the custom beam model outside the central 2.5 mm leaves necessitated more than one isocenter pending the spatial distribution of lesions. Two to nine arcs were used per isocenter. Conformity index (CI), gradient index (GI) and target dose heterogeneity index (HI) were determined for each lesion. Dose to critical structures and treatment times are reported. Lesion size ranged 0.05-17.74 cm3 (median 0.77 cm3 ), and total tumor volume per case ranged 1.09-26.95 cm3 (median 7.11 cm3 ). For each lesion, HI ranged 1.2-1.5 (median 1.3), CI ranged 1.0-2.9 (median 1.2), and GI ranged 2.5-8.4 (median 4.4). By correlating GI to PTV volume a predicted GI = 4/PTV0.2 was determined and implemented in a script in Eclipse and used for plan evaluation. Brain volume receiving 7 Gy (V7 Gy ) ranged 10-136 cm3 (median 42 cm3 ). Total treatment time ranged 24-138 min (median 61 min). Volumetric modulated arc therapy provide plans with steep dose gradien...Continue Reading

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Citations

Apr 2, 2019·Journal of Applied Clinical Medical Physics·Elizabeth L CovingtonRichard A Popple
Jul 23, 2019·Journal of Applied Clinical Medical Physics·Kang-Hyun AhnBulent Aydogan
Jul 7, 2020·Journal of Applied Clinical Medical Physics·LiCheng KuoÅse M Ballangrud
Oct 14, 2020·Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... [et al]·Hao WangKe Nie
Oct 30, 2020·Journal of Applied Clinical Medical Physics·Hisashi NakanoHidefumi Aoyama
Jan 26, 2021·Journal of Applied Clinical Medical Physics·Dharmin D DesaiIvan L Cordrey
Feb 18, 2021·Journal of Applied Clinical Medical Physics·Dharmin D DesaiIvan L Cordrey
Mar 30, 2021·Journal of Applied Clinical Medical Physics·Lei ZhangGuang Li
Apr 2, 2021·Journal of Applied Clinical Medical Physics·Sang Kyu LeeGuang Li
May 8, 2021·Journal of Applied Clinical Medical Physics·Dharmin D DesaiE L Johnson
Jun 25, 2021·Journal of Applied Clinical Medical Physics·Edward T CullomWilliam M Giles
Jul 18, 2021·Journal of Applied Clinical Medical Physics·Cody ChurchAlasdair Syme
Jul 28, 2021·Physics in Medicine and Biology·Dylan G HsuMichalis Aristophanous

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Software Mentioned

TrueBeam
ExacTrac
AlignRT
MIM
PRO VMAT
iPlan
Eclipse
VMAT

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