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Internal margin assessment using cine MRI analysis of deglutition in head and neck cancer radiotherapya)
a)Conflict of interest: This work was partially supported by Siemens Healthcare (Erlangen, Germany).
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10.1118/1.3560418
/content/aapm/journal/medphys/38/4/10.1118/1.3560418
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/4/10.1118/1.3560418

Figures

Image of FIG. 1.
FIG. 1.

Demonstration of the ability of MRI to capture the motion of swallowing. 2D FLASH images acquired with parallel imaging (a) and without parallel imaging (b). Increases in oropharynx and superior larynx signal intensity are caused by anatomy containing fully relaxed spins that move into the imaging plane during deglutition.

Image of FIG. 2.
FIG. 2.

MR images depicting resting [(a) and (d)] and swallowing [(b) and (e)] states for two patients included in the study. The time series data on the left [(a)–(c)] were acquired with parallel imaging. The time series data on the right [(d)–(f)] were acquired without parallel imaging. The peaks in the corresponding voxel time series [(c) and (f)] mark the occurrence of a swallowing event.

Image of FIG. 3.
FIG. 3.

Illustration of GTV displacement (red contours) and corresponding percent change in GTV area during one resting and one swallowing event for a representative patient. In comparison to resting-induced GTV displacement (a) and percent change in GTV area (b), deglutition-induced GTV displacement (c) and percent change in GTV area (d) exhibit greater magnitude and variability. However, the nonzero changes in GTV displacement (a) and percent change in GTV area (b) demonstrated during rest indicates there is always some degree of baseline motion. The thin, solid, horizontal line in (b) and (d) denotes the mean percent change in GTV area during resting and swallowing events, respectively.

Tables

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TABLE I.

Patient information.

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TABLE II.

Deglutition frequency and mean duration calculated from long time series acquisition.

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TABLE III.

Maximal deglutition-induced GTV displacement results.

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TABLE IV.

Maximal resting-induced GTV displacement results.

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TABLE V.

Resting- and deglutition-induced percent change in GTV area results.

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TABLE VI.

Systematic and random components of variation due to swallowing and resting.

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TABLE VII.

Asymmetric internal margins calculated from data in Tables II and VI and Eq. (5).

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/content/aapm/journal/medphys/38/4/10.1118/1.3560418
2011-03-08
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Internal margin assessment using cine MRI analysis of deglutition in head and neck cancer radiotherapya)
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/4/10.1118/1.3560418
10.1118/1.3560418
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