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First demonstration of intrafractional tumor-tracked irradiation using 2D phantom MR images on a prototype linac-MR
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10.1118/1.4802735
/content/aapm/journal/medphys/40/5/10.1118/1.4802735
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/5/10.1118/1.4802735

Figures

Image of FIG. 1.
FIG. 1.

Experimental setup: (a) brief diagram of entire setup (top down view), (b) prototype linac-MR and phantom setting with RF cage open, (c) side view with RF cage closed.

Image of FIG. 2.
FIG. 2.

Sample bSSFP sequence used to perform tracking in this study.

Image of FIG. 3.
FIG. 3.

Motion phantom: (a) phantom parts, (b) assembled phantom, (c) MR image during tracking and beam delivery, (d) phantom and RF coil placed in the linac-MR.

Image of FIG. 4.
FIG. 4.

Overview of intrafractional tumor tracking.

Image of FIG. 5.
FIG. 5.

Encoder reading comparisons from phantom and MLC (recorded every 50 ms during tracking). The readings correspond to scenarios S2–S4 and the two motion patterns are shown.

Image of FIG. 6.
FIG. 6.

Film measurement in different scenarios using the sine and modified cosine motion patterns.

Tables

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TABLE I.

Summary of time requirements to perform Steps 1–13.

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TABLE II.

Tracking scenarios.

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TABLE III.

Beam and penumbra width in different scenarios.

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/content/aapm/journal/medphys/40/5/10.1118/1.4802735
2013-04-30
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: First demonstration of intrafractional tumor-tracked irradiation using 2D phantom MR images on a prototype linac-MR
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/5/10.1118/1.4802735
10.1118/1.4802735
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