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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

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Comparing radiation treatments using intensity-modulated beams, multiple arcs, and single arcs.

Grace Tang¹, Matthew A Earl, Shuang Luan

¹Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, Maryland, USA.

International Journal of Radiation Oncology, Biology, Physics

|March 27, 2010

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Multiarc intensity-modulated arc therapy (IMAT) offers superior plan quality, while single-arc arc-modulated radiation therapy (AMRT) provides comparable results to intensity-modulated radiation therapy (IMRT) with faster delivery.

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Area of Science:

Radiation Oncology
Medical Physics

Background:

Intensity-modulated radiation therapy (IMRT) is a standard technique.
Newer arc-based techniques like intensity-modulated arc therapy (IMAT) and arc-modulated radiation therapy (AMRT) aim to improve treatment efficiency and efficacy.

Purpose of the Study:

To perform a dosimetric comparison of IMRT, multiarc IMAT, and single-arc AMRT.
To evaluate the clinical advantages and shortcomings of each technique.

Main Methods:

Twelve patient cases (head-and-neck, brain, lung, prostate) were selected.
IMRT, IMAT, and AMRT plans were generated for each case using consistent planning constraints and parameters.

Main Results:

Multiarc IMAT demonstrated the highest plan quality.
Single-arc AMRT achieved dose distributions comparable to IMRT, particularly for complex head-and-neck and brain cases.
Both AMRT and IMAT effectively spared normal tissues without compromising target coverage, with some cases showing reduced total dose to surrounding normal tissues.

Conclusions:

IMAT delivers highly uniform and conformal dose distributions, ideal for large, complex targets, with a delivery time similar to IMRT.
AMRT offers results comparable to IMRT but with significantly faster treatment delivery times.