3-D dosimetric evaluation of 2.5 mm HD120<sup>®</sup>multileaf system for intensity modulated stereotactic radiosurgery using optical CT based polymer gel dosimetry

PurposeAdvanced radiotherapy delivery systems designed for high‐dose, high‐precision treatments often come equipped with high‐definition multi‐leaf collimators (HD‐MLC) aimed at more finely shaping radiation dose to the target. In this work, we study the effect of a high definition MLC on spine stereotactic body radiation therapy (SBRT) treatment plan quality and plan deliverability.Methods and MaterialsSeventeen spine SBRT cases were planned with VMAT using a standard definition MLC (M120), HD‐MLC, and HD‐MLC with an added objective to reduce monitor units (MU). M120 plans were converted into plans deliverable on an HD‐MLC using in‐house software. Plan quality and plan deliverability as measured by portal dosimetry were compared among the three types of plans.ResultsOnly minor differences were noted in plan quality between the M120 and HD‐MLC plans. Plans generated with the HD‐MLC tended to have better spinal cord sparing (3% reduction in maximum cord dose). HD‐MLC plans on average had 12% more MU and 55% greater modulation complexity as defined by an in‐house metric. HD‐MLC plans also had significantly degraded deliverability. Of the VMAT arcs measured, 94% had lower gamma passing metrics when using the HD‐MLC.ConclusionModest improvements in plan quality were noted when switching from M120 to HD‐MLC at the expense of significantly less accurate deliverability in some cases.

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The impact of a high‐definition multileaf collimator for spine SBRT

Younge

Kuchta

Mikell

et al. 2017

J Applied Clin Med Phys

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Clinical applications of 3-D dosimeters

Wuu

2015

J. Phys.: Conf. Ser.

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3-D dosimetric evaluation of 2.5 mm HD120^®multileaf system for intensity modulated stereotactic radiosurgery using optical CT based polymer gel dosimetry

Cited by 2 publications

References 9 publications

The impact of a high‐definition multileaf collimator for spine SBRT

The impact of a high‐definition multileaf collimator for spine SBRT

Clinical applications of 3-D dosimeters

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3-D dosimetric evaluation of 2.5 mm HD120®multileaf system for intensity modulated stereotactic radiosurgery using optical CT based polymer gel dosimetry

Cited by 2 publications

References 9 publications

The impact of a high‐definition multileaf collimator for spine SBRT

The impact of a high‐definition multileaf collimator for spine SBRT

Clinical applications of 3-D dosimeters

Contact Info

Product

Resources

About

3-D dosimetric evaluation of 2.5 mm HD120^®multileaf system for intensity modulated stereotactic radiosurgery using optical CT based polymer gel dosimetry