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Feasibility of single-isocenter, multi-arc non-coplanar volumetric modulated arc therapy for multiple brain tumors using a linear accelerator with a 160-leaf multileaf collimator: a phantom study.

Iwai Y, Ozawa S, Ageishi T, Pellegrini R, Yoda K - J. Radiat. Res. (2014)

Bottom Line: The differences between the calculated dose and the dose measured by a Farmer ionization chamber and a pinpoint ionization chamber were <1.00% and <2.30%, respectively, and the average pass rates of gamma indices among the six planes under each of 3%/3 mm and 2%/2 mm criteria were 98.6% and 92.6%, respectively.The average pass rates of the gamma indices on the planes under each of 3%/3 mm and 2%/2 mm criteria were 97.8% and 88.8%, respectively.It was further shown that film dosimetry was accurately performed for a dose of up to nearly 25 Gy.

View Article: PubMed Central - PubMed

Affiliation: Research Physics, Elekta KK, 3-9-1 Shibaura, Minato-ku, Tokyo 108-0023, Japan yoshio.iwai@elekta.com.

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Dose–volume histograms. A D95 dose of 20 Gy in a single fraction was prescribed for (a) each of the 14 PTVs and (b) the entire volumes of the 14 PTVs. Dose restrictions were applied to normal brain, including the brain stem outside the targets.
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RRU042F3: Dose–volume histograms. A D95 dose of 20 Gy in a single fraction was prescribed for (a) each of the 14 PTVs and (b) the entire volumes of the 14 PTVs. Dose restrictions were applied to normal brain, including the brain stem outside the targets.

Mentions: Figure 3a and b show dose–volume histograms for the 14-mets plan, where a D95 dose of 20 Gy in a single fraction was prescribed for (Fig. 3a) each of the 14 PTVs and (Fig. 3b) the entire volumes of the 14 PTVs. As anticipated, the variation of D95 doses among the 14 PTVs was smaller when the dose was prescribed for each PTV. Further investigation would be required to reduce this variation.


Feasibility of single-isocenter, multi-arc non-coplanar volumetric modulated arc therapy for multiple brain tumors using a linear accelerator with a 160-leaf multileaf collimator: a phantom study.

Iwai Y, Ozawa S, Ageishi T, Pellegrini R, Yoda K - J. Radiat. Res. (2014)

Dose–volume histograms. A D95 dose of 20 Gy in a single fraction was prescribed for (a) each of the 14 PTVs and (b) the entire volumes of the 14 PTVs. Dose restrictions were applied to normal brain, including the brain stem outside the targets.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4202300&req=5

RRU042F3: Dose–volume histograms. A D95 dose of 20 Gy in a single fraction was prescribed for (a) each of the 14 PTVs and (b) the entire volumes of the 14 PTVs. Dose restrictions were applied to normal brain, including the brain stem outside the targets.
Mentions: Figure 3a and b show dose–volume histograms for the 14-mets plan, where a D95 dose of 20 Gy in a single fraction was prescribed for (Fig. 3a) each of the 14 PTVs and (Fig. 3b) the entire volumes of the 14 PTVs. As anticipated, the variation of D95 doses among the 14 PTVs was smaller when the dose was prescribed for each PTV. Further investigation would be required to reduce this variation.

Bottom Line: The differences between the calculated dose and the dose measured by a Farmer ionization chamber and a pinpoint ionization chamber were <1.00% and <2.30%, respectively, and the average pass rates of gamma indices among the six planes under each of 3%/3 mm and 2%/2 mm criteria were 98.6% and 92.6%, respectively.The average pass rates of the gamma indices on the planes under each of 3%/3 mm and 2%/2 mm criteria were 97.8% and 88.8%, respectively.It was further shown that film dosimetry was accurately performed for a dose of up to nearly 25 Gy.

View Article: PubMed Central - PubMed

Affiliation: Research Physics, Elekta KK, 3-9-1 Shibaura, Minato-ku, Tokyo 108-0023, Japan yoshio.iwai@elekta.com.

Show MeSH
Related in: MedlinePlus