Virtual micro‐intensity modulated radiation therapy

Siochi, R

doi:10.1118/1.1315314

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…The HDI is among several techniques that can improve the spatial resolution in intensity modulated radiotherapy with a conventional MLC. 16,17 Although the increased number of total delivery segments imposes the concern of treatment time, its application to IMRT is worth some research.…”

Section: Discussionmentioning

confidence: 99%

Implementation of the isocenter‐shift technique for smoothing MLC field edge on a 3D treatment planning system

Xue

Zhang

et al. 2002

Medical Physics

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Stepped leaf edges are the major limitation of conforming to the prescribed treatment contour defined by the conventional multileaf collimator (MLC), which produces a scalloped dose pattern. The commercial HD‐270 MLC™ (HDI) technique provides a software solution of the conventional MLC to achieve smoothed edge and optimal penumbra of the MLC shaped field. We implemented the HDI functionality on a 3D treatment planning system and compared the dosimetric effects of the HDI delivery in simulation with those in experiment for a number of the MLC fields. The fields from the contour of varied shapes with different sizes of the leaf stepping were tested for the HDI delivery. There is a good agreement of the dose distribution between the calculation as implemented in the planning system and the measurement performed on the treatment machine. It has been shown that the HDI delivery significantly smoothes the stepped field edge with the reduced isodose undulation and effective penumbra. A problem may be present when the HDI is applied for the treatment of the circular contour of smaller diameter, and the conformity of the MLC shaping may not be achievable satisfactorily with the existing system. The optimization of leaf configuration is suggested to improve the conformity of the HDI technique. The HDI planning then can be used to assist in the decision making of applying the HDI treatment delivery.

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Section: Discussionmentioning

confidence: 99%

Implementation of the isocenter‐shift technique for smoothing MLC field edge on a 3D treatment planning system

Xue

Zhang

et al. 2002

Medical Physics

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“…Since then there has been the steady growth and development of IMRT optimisation and delivery techniques 1,[25][26][27][28][29][30][31][32][33][34][35][36] . The delivery of IMRT using MLC based methods is now at the point where it is an attainable treatment option for many centres.…”

Section: The History Of Imrt: a Literature Reviewmentioning

confidence: 99%

A Review of intensity modulated radiation therapy: Incorporating a report on the seventh education workshop of the ACPSEM — ACT/NSW branch

Williams

2002

Australas. Phys. Eng. Sci. Med.

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Intensity modulated radiation therapy (IMRT) is an evolving treatment technique that has become a clinical treatment option in several radiotherapy centres around the world. In August 2001 the ACT/NSW branch of the ACPSEM held its seventh education workshop, the subject was IMRT. This review considers the current use of IMRT and reports on the proceedings of the workshop. The workshop provided some of the theory behind IMRT, discussion of the practical issues associated with IMRT, and also involved presentations from Australian centres that had clinically implemented IMRT. The main topics of discussion were patient selection, plan assessment, multi-disciplinary approach, quality assurance and delivery of IMRT. Key points that were emphasised were the need for a balanced multi-disciplinary approach to IMRT, in both the establishment and maintenance of an IMRT program; the importance of the accuracy of the final dose distribution as compared to the minor in-field fluctuations of individual beams; and that IMRT is an emerging treatment technique, undergoing continuing development and refinement.

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“…The beam-on time and the number of MLC-apertures are closely associated with the complexity of the IM A , which, however, is not well defined. In this paper, we use the sum of positive gradients to measure the complexity C ( A ) of an IM A [4, 5, 6], more precisely,

C false(A false) = \sum_{i = 1}^{m} (a_{i, 1} + \sum_{j = 2}^{n} max (0, a_{i, j} - a_{i, j - 1}))

.…”

Section: Introductionmentioning

confidence: 99%

An almost linear time algorithm for field splitting in radiation therapy

Dou²,

Bayouth

et al. 2013

Computational Geometry

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In this paper, we study an interesting geometric partition problem, called optimal field splitting, which arises in Intensity-Modulated Radiation Therapy (IMRT). In current clinical practice, a multi-leaf collimator (MLC) with a maximum leaf spread constraint is used to deliver the prescribed intensity maps (IMs). However, the maximum leaf spread of an MLC may require to split a large intensity map into several overlapping sub-IMs with each being delivered separately. We develop a close-to-linear time algorithm for solving the field splitting problem while minimizing the total complexity of the resulting sub-IMs, thus improving the treatment delivery efficiency. Meanwhile, our algorithm strives to minimize the maximum beam-on time of those sub-IMs. Our basic idea is to formulate the field splitting problem as computing a shortest path in a directed acyclic graph, which expresses a special “layered” structure. The edge weights of the graph satisfy the Monge property, which enables us to solve this shortest path problem by examining only a small portion of the graph, yielding a close-to-linear time algorithm. To minimize the maximum beam-on time of the resulting sub-IMs, we consider an interesting min-max slope path problem in a monotone polygon which is solvable in linear time. The min-max slope path problem may be of interest in its own right. Experimental results based on real medical data and computer generated IMs showed that our new algorithm runs fast and produces high quality field splitting results.

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Virtual micro‐intensity modulated radiation therapy

Cited by 14 publications

References 14 publications

Implementation of the isocenter‐shift technique for smoothing MLC field edge on a 3D treatment planning system

Implementation of the isocenter‐shift technique for smoothing MLC field edge on a 3D treatment planning system

A Review of intensity modulated radiation therapy: Incorporating a report on the seventh education workshop of the ACPSEM — ACT/NSW branch

An almost linear time algorithm for field splitting in radiation therapy

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