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Effect of beamlet step-size on IMRT plan quality
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Image of FIG. 1.
FIG. 1.

The C-shaped structural arrangement of the IMRT benchmark. The OAR is a central cylinder in diameter and in length. The PTV is half a donut that surrounds the cylinder by 180° and is wide. There is a separation between the PTV and OAR.

Image of FIG. 2.
FIG. 2.

Isodose lines of the central transverse slices for beamlet size (a) , (b) , (c) , and (d) . The isodose lines from inner to outer positions represent 95%, 70%, 50%, 30%, and 12% of the prescription dose.

Image of FIG. 3.
FIG. 3.

Objective function values as the results of the DAO dose optimization. The values are normalized such that the value of the case is 1.

Image of FIG. 4.
FIG. 4.

PTV DVH. The percent target volume at least receiving 100% prescribed dose are 95% and 90% for beamlet sizes 1, 2, and , and , respectively.

Image of FIG. 5.
FIG. 5.

OAR DVH. This shows that smaller beamlet sizes give a smaller dose to the OAR region.

Image of FIG. 6.
FIG. 6.

Dose profiles along a vertical line in the central transverse slice. The dose is plotted against the vertical distance measured from the bottom central point of the OAR on the sampled slice.

Image of FIG. 7.
FIG. 7.

Intensity map of the sum of the four leaf pairs in the middle of the PTV in the transverse direction for beamlet size (a) , (b) , (c) , and (d) . For an easy comparison, Fig. 1 is also shown here.


Generic image for table

Statistical result. Sigma is standard deviation of the dose.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of beamlet step-size on IMRT plan quality