SU-E-T-152: Development of a Phantom for Commissioning and Patient Specific QA for Volumetric Modulated Arc Therapy (VMAT)

2012 ◽  
Vol 39 (6Part12) ◽  
pp. 3738-3738
Author(s):  
R Holla ◽  
B Pillai
Keyword(s):  
Volumetric Modulated Arc Therapy ◽  
Patient Specific ◽  
Arc Therapy ◽  
Patient Specific Qa

scholarly journals Can clinically relevant dose errors in patient anatomy be detected by gamma passing rate or modulation complexity score in volumetric-modulated arc therapy for intracranial tumors?

2017 ◽  
Vol 58 (5) ◽  
pp. 685-692 ◽  
Author(s):  
Shingo Ohira ◽  
Yoshihiro Ueda ◽  
Masaru Isono ◽  
Akira Masaoka ◽  
Misaki Hashimoto ◽  
...  
Keyword(s):  
Volumetric Modulated Arc Therapy ◽  
Patient Specific ◽  
Array Detector ◽  
Intracranial Tumors ◽  
Clinical Dose ◽  
Complexity Score ◽  
Passing Rate ◽  
Arc Therapy ◽  
Patient Specific Qa ◽  
Gamma Passing Rate

Abstract We investigated whether methods conventionally used to evaluate patient-specific QA in volumetric-modulated arc therapy (VMAT) for intracranial tumors detect clinically relevant dosimetric errors. VMAT plans with coplanar arcs were designed for 37 intracranial tumors. Dosimetric accuracy was validated by using a 3D array detector. Dose deviations between the measured and planned doses were evaluated by gamma analysis. In addition, modulation complexity score for VMAT (MCSv) for each plan was calculated. Three-dimensional dose distributions in patient anatomy were reconstructed using 3DVH software, and clinical deviations in dosimetric parameters between the 3DVH doses and planned doses were calculated. The gamma passing rate (GPR)/MCSv and the clinical dose deviation were evaluated using Pearson's correlation coefficient. Significant correlation (P < 0.05) between the clinical dose deviation and GPR was observed with both the 3%/3 mm and 2%/2 mm criteria in clinical target volume (D99), brain (D2), brainstem (D2) and chiasm (D2), albeit that the correlations were not ‘strong’ (0.38 < |r| < 0.54). The maximum dose deviations of brainstem were up to 4.9 Gy and 2.9 Gy for Dmax and D%, respectively in the case of high GPR (98.2% with 3%/3 mm criteria). Regarding MCSv, none of the evaluated organs showed a significant correlation with clinical dose deviation, and correlations were ‘weak’ or absent (0.01 < |r| < 0.21). The use of high GPR and MCSv values does not always detect dosimetric errors in a patient. Therefore, in-depth analysis with the DVH for patient-specific QA is considered to be preferable for guaranteeing safe dose delivery.

scholarly journals Feasibility Study of Mobius3D for Patient-Specific Quality Assurance in the Volumetric Modulated Arc Therapy

2019 ◽  
Vol 30 (4) ◽  
pp. 120
Author(s):  
Chang Yeol Lee ◽  
Woo Chul Kim ◽  
Hun Jeong Kim ◽  
Jeongshim Lee ◽  
Hyun Do Huh
Keyword(s):  
Quality Assurance ◽  
Feasibility Study ◽  
Volumetric Modulated Arc Therapy ◽  
Patient Specific ◽  
Arc Therapy
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