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Organ and effective doses in pediatric patients undergoing helical multislice computed tomography examination
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10.1118/1.2723885
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    Affiliations:
    1 Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, Florida 32611-8300
    2 Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, Florida 32611-8300
    3 Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, Florida 32611-8300
    4 Departments of Nuclear and Radiological Engineering and Biomedical Engineering, University of Florida, Gainesville, Florida 32611-8300
    5 Department of Radiology, University of Florida/Shands Healthcare, Inc., Gainesville, Florida 32610-0374
    6 Department of Radiology, University of Florida/Shands Healthcare, Inc., Gainesville, Florida 32610-0374
    7 Departments of Nuclear and Radiological Engineering and Biomedical Engineering, University of Florida, Gainesville, Florida 32611-8300
    a) Present address: MD Anderson Cancer Center Orlando, Orlando, FL 32806.
    b) Author to whom correspondence should be addressed. Present address: Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, Florida 32611-8300. Electronic mail: wbolch@ufl.edu
    Med. Phys. 34, 1858 (2007); http://dx.doi.org/10.1118/1.2723885
/content/aapm/journal/medphys/34/5/10.1118/1.2723885
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/34/5/10.1118/1.2723885

Figures

Image of FIG. 1.
FIG. 1.

(a) UF Series B tomographic phantoms with removal of the arms for positioning under pediatric CT examination and (b) ORNL phantom series with arm bones in place within the ellipsoidal regions of the torso.

Image of FIG. 2.
FIG. 2.

Placement of (a) the ORNL 10-year phantom and (b) the UF 11-year male phantom on the CT table within the MCNPX radiation transport code. The helical trace of the x-ray sources is shown at an extended detector pitch of 3.0 for improved viewing of the irradiation geometry.

Image of FIG. 3.
FIG. 3.

Age-dependent effective doses for the ORNL phantoms (solid lines, male; dashed lines, female) and the UF tomographic phantoms (closed circles, male; open triangles, female) for head CT examinations at 80, 100, and for a collimator setting of . Data are shown for either (a) head, (b) chest, (c) abdomen, (d) pelvis, and (e) chest-abdomen-pelvis (or CAP) examinations.

Image of FIG. 4.
FIG. 4.

Variations in torso shape between the ORNL stylized and the UF voxel pediatric phantoms of this study. Figures 4(a) to 4(c) give the thickness of the torso in the AP-direction at the midline as a function of the distance from the top of the phantom’s head. Points indicate the location of the organ centroid with respect to its cranial-caudal position within the torso. Figures 4(d) to 4(f) give the corresponding circumference of the torso as a function of this same distance. Sagittal views of the various pairs of phantoms are shown in the lower row of the figure.

Image of FIG. 5.
FIG. 5.

Variation of effective dose with (16-cm PMMA head phantom) for helical MSCT examinations of the head and CAP at two patient ages. For each curve, three data points are indicated for tube potentials of 80, 100, and , respectively, in increasing order.

Image of FIG. 6.
FIG. 6.

The skeletal structures near the ovaries of (A) the ORNL 5-year phantom and (B) the UF 4-year phantom.

Image of FIG. 7.
FIG. 7.

Anatomical regions irradiated during chest CT examination in (a) the ORNL 1-year phantom and (b) the UF 9-month phantom.

Tables

Generic image for table
TABLE I.

Specifications for the ORNL pediatric phantom series and the UF Series B phantoms.

Generic image for table
TABLE II.

Definitions of anatomical boundaries for CT examinations for the ORNL pediatric phantom series.

Generic image for table
TABLE III.

Definitions of anatomical boundaries for CT examinations for the UF Series B pediatric phantoms.

Generic image for table
TABLE IV.

Comparison of organ absorbed dose (mGy) and effective dose (mSv) for the ORNL 1-year and the UF 9-month phantoms normalized per . The tube potential of and the collimated beam thickness of were used for the simulation. [.]

Generic image for table
TABLE VII.

Comparison of organ absorbed dose (mGy) and effective dose (mSv) for the ORNL 15-year and the UF 14-year phantoms normalized per . The tube potential of and the collimated beam thickness of were used for the simulation. [.]

Generic image for table
TABLE V.

Comparison of organ absorbed dose (mGy) and effective dose (mSv) for the ORNL 5-year and the UF 4-year phantoms normalized per . The tube potential of and the collimated beam thickness of were used for the simulation. [.]

Generic image for table
TABLE VI.

Comparison of organ absorbed dose (mGy) and effective dose (mSv) for the ORNL 10-year and the UF 11-year phantoms normalized per . The tube potential of and the collimated beam thickness of were used for the simulation. [.]

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/content/aapm/journal/medphys/34/5/10.1118/1.2723885
2007-04-26
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Organ and effective doses in pediatric patients undergoing helical multislice computed tomography examination
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/34/5/10.1118/1.2723885
10.1118/1.2723885
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