scholarly journals Motion-Induced Interplay Effects for Hypofractionated Volumetric Modulated Arc Therapy Treatment of Liver Tumors—Dependence on Breathing Pattern, Dose Rate, and Plan Modulation Complexity

2016 ◽  
Vol 96 (2) ◽  
pp. E661
Author(s):  
A. Edvardsson ◽  
F. Nordstrom ◽  
C. Ceberg ◽  
S. Ceberg
Keyword(s):  
Dose Rate ◽  
Breathing Pattern ◽  
Liver Tumors ◽  
Volumetric Modulated Arc Therapy ◽  
Arc Therapy ◽  
Therapy Treatment

Is 5 mm breath-hold window (BHW) sufficient to treat carcinoma left breast patients post-conservative surgery: a comparative study using forward intensity-modulated radiotherapy (FIMRT) and volumetric modulated arc therapy (VMAT)

2020 ◽  
pp. 1-9
Author(s):  
Karthikeyan Kalyanasundaram ◽  
Subramani Vellaiyan
Keyword(s):  
Breathing Pattern ◽  
Volumetric Modulated Arc Therapy ◽  
Intensity Modulated Radiotherapy ◽  
Conservative Surgery ◽  
Target Volume ◽  
Left Breast ◽  
Breath Hold ◽  
Deep Inspiration ◽  
Intensity Modulated ◽  
Arc Therapy

Abstract Purpose: The purpose of the study was to evaluate the impact of changes in breathing pattern inside the breath-hold window (BHW) during deep inspiration breath hold treatment for carcinoma left breast patients post-conservative surgery. Methods: Ten patients of carcinoma left breast post-conservative surgery were prospectively selected. Three sets of CT plain images were acquired, one with 5 mm deep inspiration BHW (DIBHR) and the other one with 1 mm BHW matching the lower threshold (DIBHL) and the third one with 1 mm BHW matching the upper threshold (DIBHH) as DIBHR. For all patients, forward intensity-modulated radiotherapy (FIMRT) and volumetric modulated arc therapy (VMAT) plans were generated in the 5 mm BHW CT series and the same plan being copy and pasted in other series. Target volume doses and critical structure doses were tabulated. Results: Planning target volume coverage was adequate and no significant differences were found in any CT series. Significant differences noted in average left lung V5%, V10% and V18% doses between DIBHR versus DIBHH (p values = 0·0461, 0·0283 and 0·0213, respectively) and DIBHL versus DIBHH (p values = 0·0434, 0·0484 and 0·0334, respectively) for FIMRT plans and V18% doses in DIBHR versus DIBHH (p = 0·0067) in VMAT. No differences in heart and apex of heart doses were found. Left anterior descending artery (LAD) mean doses were significant in DIBHL versus DIBHR, DIBHR versus DIBHH and DIBHL versus DIBHH (p = 0·0012, 0·0444 and 0·0048, respectively) series for FIMRT plans and DIBHR versus DIBHH and DIBHL versus DIBHH (p = 0·0341, 0·0001) for VMAT plans. Finding: The changes in the breathing pattern inside DIBH window level cause some variation in LAD doses and no other significant differences in any parameters noted, so care should be taken while treating patients with preexisting cardiac conditions.

scholarly journals Is volumetric modulated arc therapy with constant dose rate a valid option in radiation therapy for head and neck cancer patients?

2018 ◽  
Vol 23 (3) ◽  
pp. 175-182 ◽  
Author(s):  
Annamaria Didona ◽  
Valentina Lancellotta ◽  
Claudio Zucchetti ◽  
Bianca Moira Panizza ◽  
Alessandro Frattegiani ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Head And Neck Cancer ◽  
Head And Neck ◽  
Dose Rate ◽  
Cancer Patients ◽  
Neck Cancer ◽  
Volumetric Modulated Arc Therapy ◽  
Arc Therapy ◽  
Constant Dose ◽  
Constant Dose Rate
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