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.
Feasibility study on inverse four-dimensional dose reconstruction using the continuous dose-image of EPID
Rent:
Rent this article for
USD
10.1118/1.4799941
/content/aapm/journal/medphys/40/5/10.1118/1.4799941
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/5/10.1118/1.4799941

Figures

Image of FIG. 1.
FIG. 1.

Response ratio operator of virtual beamlet under jaw opening that replaces the response ratio of delivered beamlet under beam segments (colored).

Image of FIG. 2.
FIG. 2.

Measurement setup. (a) Film is sandwiched in the middle of the two 5 cm solid water phantoms on a moving platform. (b) The top view of the top slab that has a cavity. (c) A cavity in (b) cross-sectional view. Each distance in the cavity is 2 cm. The phantom moved horizontally along in-plane.

Image of FIG. 3.
FIG. 3.

A test IMRT beam used in this study.

Image of FIG. 4.
FIG. 4.

Four-dimensional dose reconstruction diagram from EPID to phantom. EPID images were temporal phase-sorted and assigned to corresponding spatial phases. Darkened phases imply (partially) discontinued acquisition due to MLC travel between segments.

Image of FIG. 5.
FIG. 5.

(a) Dose profiles in cGy measured with film on a midplane in the flat phantom under no motion, (b) dose profiles reconstructed at the same condition, (c) dose profiles forward-calculated at the same condition, (d) central dose profile comparison between the three at X = 100 mm, (e) dose differences along the central in-planar direction.

Image of FIG. 6.
FIG. 6.

(a) Beam profile comparison between integrated mode and cine mode for the test intensity-modulated beam in EPID at 150 cm. The cine mode data displayed above was determined after integration over time. (b) Relative difference showing ratio of integrated mode to cine mode.

Image of FIG. 7.
FIG. 7.

(a) Dose profiles in cGy for the test IMRT beam measured with film on a midplane in the homogeneous flat phantom that was under motion, (b) dose profiles reconstructed at the same condition, (c) dose profiles forward-calculated at the same condition, (d) central dose profile comparison between the three at X = 100 mm, and (e) gamma comparison between dose profiles measured with film and reconstructed.

Image of FIG. 8.
FIG. 8.

(a) Dose profiles in cGy for the test IMRT beam measured with film on a midplane in the heterogeneous phantom that was under motion, (b) dose profiles reconstructed at the same condition, (c) dose profiles forward-calculated at the same condition, (d) central dose profile comparison between the three at X = 100 mm, and (e) gamma comparison between dose profiles measured with film and reconstructed.

Tables

Generic image for table
TABLE I.

Response differences between integrated mode and cine mode for the test intensity-modulated beam with varying MUs. The differences were determined at the point of dose maximum.

Generic image for table
TABLE II.

Phase sorting of EPID images for four-dimensional dose reconstruction. EPID images acquired for the irradiation on the heterogeneous phantom were temporal-phase-sorted considering a single frame acquisition time of 0.0606 s, MLC travel duration of 0.85 s between segments, and phantom movement time of 4.5 s/cycle. Similar sorting was performed for the irradiation on the homogeneous phantom. Highlighted phases correspond to MLC travel duration.

Loading

Article metrics loading...

/content/aapm/journal/medphys/40/5/10.1118/1.4799941
2013-04-10
2014-04-25
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Feasibility study on inverse four-dimensional dose reconstruction using the continuous dose-image of EPID
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/5/10.1118/1.4799941
10.1118/1.4799941
SEARCH_EXPAND_ITEM