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Helical tomotherapy superficial dose measurements
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10.1118/1.2757000
/content/aapm/journal/medphys/34/8/10.1118/1.2757000
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/34/8/10.1118/1.2757000

Figures

Image of FIG. 1.
FIG. 1.

The PTV (solid lines), cord (dark shaded area), and parotids (light shaded areas) contours for (A) the and (B) the helical tomotherapy plans.

Image of FIG. 2.
FIG. 2.

Megavoltage CT (MVCT) imaging was used to position the head phantom in the treatment position. An automatic CT-to-CT fusion algorithm was used to register the treatment planning CT images (shown in grayscale) and the pretreatment MVCT images.

Image of FIG. 3.
FIG. 3.

Placement of film and TLD chip packets. Each packet contained two to three TLD chips. The film was placed between two slices of the phantom, cut to shape, and covered with light-proof tape.

Image of FIG. 4.
FIG. 4.

Measured film dose for the helical tomotherapy plan. The dashed line represents the location of the dose profile used to measure surface dose.

Image of FIG. 5.
FIG. 5.

(A) Planning target volume, (B) left parotid, and (C) right parotid Dose volume histograms for helical tomotherapy treatment plans with a 0, 1, 2, 3, 4, and separation between the PTV and the surface of a head-and-neck phantom.

Image of FIG. 6.
FIG. 6.

Mean TLD doses (Squares) and mean calculated doses (Circles) for helical tomotherapy treatment plans with a (A) 0, (B) 1, (C) 2, (D) 3, (E) 4, and (F) separation between the PTV and the surface of a head-and-neck phantom. The calculated and measured standard deviations are given for each of the 12 TLD packet locations shown in Fig. 2.

Image of FIG. 7.
FIG. 7.

Mean TLD doses (Squares), mean calculated doses (Diamonds), and mean film doses (Triangles) for helical tomotherapy treatment plans with a 0, 1, 2, 3, 4, and separation between the PTV and the surface of a head-and-neck phantom.

Tables

Generic image for table
TABLE I.

(A) Calculated and (B) TLD measured doses for PTV, to surface separations of 0, 1, 2, 3, 4, and . The mean and standard deviations are given for each of the 12 TLD packet locations shown in Fig. 2.

Generic image for table
TABLE II.

Summary of (A) calculated, (B) TLD measured doses, and (C) film doses for PTV to surface separations of 0, 1, 2, 3, 4, and . The overall mean and standard deviation , and number of data points are given for each plan.

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/content/aapm/journal/medphys/34/8/10.1118/1.2757000
2007-07-25
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Helical tomotherapy superficial dose measurements
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/34/8/10.1118/1.2757000
10.1118/1.2757000
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