1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.
f
An adaptive planning strategy for station parameter optimized radiation therapy (SPORT): Segmentally boosted VMAT
Rent:
Rent this article for
Access full text Article
/content/aapm/journal/medphys/40/5/10.1118/1.4802748
1.
1. G. A. Ezzell et al., “Guidance document on delivery, treatment planning, and clinical implementation of IMRT: Report of the IMRT Subcommittee of the AAPM Radiation Therapy Committee,” Med. Phys. 30(8), 20892115 (2003).
http://dx.doi.org/10.1118/1.1591194
2.
2. R. Li and L. Xing, “Bridging the gap between IMRT and VMAT: Dense angularly sampled and sparse intensity modulated radiation therapy,” Med. Phys. 38(9), 49124919 (2011).
http://dx.doi.org/10.1118/1.3618736
3.
3. L. Xing, M. Philips, and C. Orton, “DASSIM-RT is likely to become the method of choice over conventional IMRT and VMAT for delivery of highly conformal radiotherapy,” Med. Phys. 40(2), 020601 (3pp.) (2013).
http://dx.doi.org/10.1118/1.4773025
4.
4. P. Zhang et al., “Optimization of collimator trajectory in volumetric modulated arc therapy: Development and evaluation for paraspinal SBRT,” Int. J. Radiat. Oncol., Biol., Phys. 77(2), 591599 (2010).
http://dx.doi.org/10.1016/j.ijrobp.2009.08.056
5.
5. A. Niemierko, “Reporting and analyzing dose distributions: A concept of equivalent uniform dose,” Med. Phys. 24(1), 103110 (1997).
http://dx.doi.org/10.1118/1.598063
6.
6. Q. Wu et al., “Optimization of intensity-modulated radiotherapy plans based on the equivalent uniform dose,” Int. J. Radiat. Oncol., Biol., Phys. 52(1), 224235 (2002).
http://dx.doi.org/10.1016/S0360-3016(01)02585-8
7.
7. E. Schreibmann and L. Xing, “Dose-volume based ranking of incident beam direction and its utility in facilitating IMRT beam placement,” Int. J. Radiat. Oncol., Biol., Phys. 63(2), 584593 (2005).
http://dx.doi.org/10.1016/j.ijrobp.2005.06.008
8.
8. X. Wang et al., “Effectiveness of noncoplanar IMRT planning using a parallelized multiresolution beam angle optimization method for paranasal sinus carcinoma,” Int. J. Radiat. Oncol., Biol., Phys. 63(2), 594601 (2005).
http://dx.doi.org/10.1016/j.ijrobp.2005.06.006
9.
9. A. Pugachev and L. Xing, “Pseudo beam's-eye-view as applied to beam orientation selection in intensity-modulated radiation therapy,” Int. J. Radiat. Oncol., Biol., Phys. 51(5), 13611370 (2001).
http://dx.doi.org/10.1016/S0360-3016(01)01736-9
10.
10. A. Pugachev and L. Xing, “Incorporating prior knowledge into beam orientation optimization in IMRT,” Int. J. Radiat. Oncol., Biol., Phys. 54(5), 15651574 (2002).
http://dx.doi.org/10.1016/S0360-3016(02)03917-2
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/5/10.1118/1.4802748
Loading
/content/aapm/journal/medphys/40/5/10.1118/1.4802748
Loading

Data & Media loading...

Loading

Article metrics loading...

/content/aapm/journal/medphys/40/5/10.1118/1.4802748
2013-05-01
2014-11-22

Abstract

Conventional volumetric modulated arc therapy (VMAT) discretizes the angular space into equally spaced control points during planning and then optimizes the apertures and weights of the control points. The aperture at an angle in between two control points is obtained through interpolation. This approach tacitly ignores the differential need for intensity modulation of different angles. As such, multiple arcs are often required, which may oversample some angle(s) and undersample others. The purpose of this work is to develop a segmentally boosted VMAT scheme to eliminate the need for multiple arcs in VMAT treatment with improved dose distribution and/or delivery efficiency.

The essence of the new treatment scheme is how to identify the need of individual angles for intensity modulation and to provide the necessary beam intensity modulation for those beam angles that need it. We introduce a “demand metric” at each control point to decide which station or control points need intensity modulation. To boost the modulation at selected stations, additional segments are added in the vicinity of the selected stations. The added segments are then optimized together with the original set of station or control points as a whole. The authors apply the segmentally boosted planning technique to four previously treated clinical cases: two head and neck (HN) cases, one prostate case, and one liver case. The proposed planning technique is compared with conventional one-arc and two-arc VMAT.

The proposed segmentally boosted VMAT technique achieves better critical structure sparing than one-arc VMAT with similar or better target coverage in all four clinical cases. The segmentally boosted VMAT also outperforms two-arc VMAT for the two complicated HN cases, yet with ∼30% reduction in the machine monitor units (MUs) relative to two-arc VMAT, which leads to less leakage/scatter dose to the patient and can potentially translate into faster dose delivery. For the less challenging prostate and liver cases, similar critical structure sparing as the two-arc VMAT plans was obtained using the segmentally boosted VMAT. The benefit for the two simpler cases is the reduction of MUs and improvement of treatment delivery efficiency.

Segmentally boosted VMAT achieves better dose conformality and/or reduced MUs through effective consideration of the need of individual beam angles for intensity modulation. Elimination of the need for multiple arcs in rotational arc therapy while improving the dose distribution should lead to improved workflow and treatment efficacy, thus may have significant implication to radiation oncology practice.

Loading

Full text loading...

/deliver/fulltext/aapm/journal/medphys/40/5/1.4802748.html;jsessionid=ag9g88j6v319.x-aip-live-03?itemId=/content/aapm/journal/medphys/40/5/10.1118/1.4802748&mimeType=html&fmt=ahah&containerItemId=content/aapm/journal/medphys
true
true
This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An adaptive planning strategy for station parameter optimized radiation therapy (SPORT): Segmentally boosted VMAT
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/5/10.1118/1.4802748
10.1118/1.4802748
SEARCH_EXPAND_ITEM