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In vivo verification of superficial dose for head and neck treatments using intensity-modulated techniques
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10.1118/1.3030951
/content/aapm/journal/medphys/36/1/10.1118/1.3030951
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/1/10.1118/1.3030951

Figures

Image of FIG. 1.
FIG. 1.

A schematic comparison of the packaging between typical MOSFET detectors (left) and MOSkins (right). To yield a minimal but reproducible intrinsic buildup, the MOSkin surface is specially coated with a polyimide thin film rather than conventional epoxy bubble, which also avoids wire bonding.

Image of FIG. 2.
FIG. 2.

Percentage depth doses (PDD) for normally incident photon beams. Measurements were performed with different detectors in a water-equivalent RW3 slab phantom. At a fixed , the following field sizes were investigated: (a), , (b) (c), and (d). The MOSkin measured PDDs, as given in Table III, were corrected for the intrinsic buildup thickness. The error bars represent the coefficient of dispersion of five measurements.

Image of FIG. 3.
FIG. 3.

Sensitivity variation of the MOSkin detector with incident-beam angles for dose measurements at the phantom surface. The radiation field size was set to be at . The error bars represent the coefficient of dispersion of five measurements. Results were normalized to the 0° value.

Image of FIG. 4.
FIG. 4.

Determination of water-equivalent depth (WED) for the OneDose™ MOSFET detector. The percentage depth doses (PDD) obtained with the OneDose™ MOSFET at the phantom surface and at the depth for the photon beam of field size were compared to a polynomial fit of the Attix chamber measurements in the buildup region.

Image of FIG. 5.
FIG. 5.

Relative deviation of MOSkin measured skin doses from TPS calculated skin doses as percentage for a total of 16 measurements of 6 NPC patients. The negative deviation, defined as (dose measured-dose calculated)/dose , indicates that the measured skin doses are lower than the calculated values.

Tables

Generic image for table
TABLE I.

Percentage depth doses (PDD) obtained with an Attix chamber in a water-equivalent RW3 phantom for normally incident photon beams from a Varian 600C linac. Different field sizes ranging from were investigated using a fixed . The coefficients of dispersion relevant to the Attix chamber measurements were on average 0.03%.

Generic image for table
TABLE II.

Percentage depth doses (PDD) obtained with EBT films in a water-equivalent RW3 phantom for normally incident photon beams from a Varian 600C linac. At , different field sizes ranging from were investigated. The coefficients of dispersion in EBT film measurements were on average 1.02%.

Generic image for table
TABLE III.

Percentage depth doses (PDD) obtained with a MOSkin detector at the slab phantom surface and in the buildup region for normally incident photon beams. Different field sizes ranging from were investigated using a fixed . The equivalent depth was herein referred to the equivalent mass depth from the phantom surface to the detector surface. The coefficients of dispersion relevant to the MOSkin measurements were also listed.

Generic image for table
TABLE IV.

Water equivalent depth (WED) of the MOSkin detector for each field size under photon beams. The coefficients of dispersion associated with MOSkin measurements at the phantom surface were on average 1.7%.

Generic image for table
TABLE V.

Percentage depth doses (PDD) measured at the phantom surface using four MOSkin detectors from the same batch for the photon beam of field size. Each measurement was repeated five times and the average values were reported. The coefficients of dispersion relevant to MOSkin measurements at the phantom surface were on average 1.7%. The WED values associated with each individual MOSkin detector were also given.

Generic image for table
TABLE VI.

Percentage depth doses (PDD) measured with the MOSkin detector and the Attix chamber, respectively, at the phantom surface for both normal and oblique incident beams. The coefficients of dispersion of each assessment were also reported. The ratios of MOSkin measurements to the corresponding Attix chamber results, normalized to the 0 value, were taken to evaluate the angular dependence of the MOSkin detector.

Generic image for table
TABLE VII.

Comparison of doses measured using the MOSkin detector with doses calculated by the Corvus TPS at different depths for various locations of clinical interest in an anthropomorphic phantom. The coefficients of dispersion of MOSkin measurements were also listed.

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/content/aapm/journal/medphys/36/1/10.1118/1.3030951
2008-12-05
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: In vivo verification of superficial dose for head and neck treatments using intensity-modulated techniques
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/1/10.1118/1.3030951
10.1118/1.3030951
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