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Monte Carlo modeling for dose assessment in cone beam CT for oral and maxillofacial applications
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10.1118/1.4810967
/content/aapm/journal/medphys/40/7/10.1118/1.4810967
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/7/10.1118/1.4810967

Figures

Image of FIG. 1.
FIG. 1.

Outlines of the head and neck computational phantoms in 3D with examples of imaging FOVs: (a) ICRP reference male phantom with FOV, (b) ICRP female phantom with FOV, (c) Zubal phantom with FOV, and (d) VCH phantom with FOV.

Image of FIG. 2.
FIG. 2.

The reconstructed axial image of the ionization chamber in the water phantom as obtained during the Monte Carlo dose normalization measurement with (a) Accuitomo FOV and (b) Scanora FOV. The small circle with metal-like intensity present outside of the phantom is the connection cable and the waterproof sleeve of the chamber.

Image of FIG. 3.
FIG. 3.

Organ absorbed doses calculated for different phantoms with the large and the medium FOV of the Accuitomo (upper) and the Scanora (lower) at 90 kV. “ET” and “RBM” stand for the extrathoracic tissue and the red bone marrow, respectively.

Image of FIG. 4.
FIG. 4.

Organ absorbed doses calculated for different phantoms with FOV of the two CBCT systems at 90 kV.

Image of FIG. 5.
FIG. 5.

Comparison of the organ absorbed dose for the reference male phantom calculated with different FOVs of the Accuitomo at 90 kV.

Image of FIG. 6.
FIG. 6.

Calculated effective doses with Accuitomo FOV at different tube potentials.

Image of FIG. 7.
FIG. 7.

The effective doses calculated for the reference male and the VCH phantom with the half-rotation mode of the Accuitomo at 90 kV from different initial angles.

Image of FIG. 8.
FIG. 8.

Voxel dose distributions calculated for a typical axial plane of the Zubal phantom with (a) Accuitomo FOV, (b) Scanora FOV, (c) Accuitomo FOV, and (d) Scanora FOV at 90 kV.

Tables

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TABLE I.

Organ masses (g) of the computational head and neck phantoms.

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TABLE II.

Protocols to position the imaging FOV in oral and maxillofacial CBCT.

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TABLE III.

Tissue weighting factors for use in calculation of the effective dose.

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TABLE IV.

The Monte Carlo dose normalization factors for selected exposure settings.

Generic image for table
TABLE V.

Effective doses (Sv mAs) calculated for the phantoms with selected FOVs of the two systems at 90 kV.

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/content/aapm/journal/medphys/40/7/10.1118/1.4810967
2013-06-18
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Monte Carlo modeling for dose assessment in cone beam CT for oral and maxillofacial applications
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/7/10.1118/1.4810967
10.1118/1.4810967
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