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Organ and effective doses in newborns and infants undergoing voiding cystourethrograms (VCUG): A comparison of stylized and tomographic phantoms
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10.1118/1.2402329
/content/aapm/journal/medphys/34/1/10.1118/1.2402329
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/34/1/10.1118/1.2402329

Figures

Image of FIG. 1.
FIG. 1.

Fluoroscopy suite setup with video and CCD camera recording equipment used to videotape both the x-ray images and machine technique factors required for later image analysis and dosimetry studies.

Image of FIG. 2.
FIG. 2.

A display of the effects of attenuator thickness on peak tube potential for radiographic mode of operation for the two clinically used kVp values. The patient specific mAs scaling factor for a particular field can be calculated by the ratio of the kVps determined by the thickness of the estimated patient thickness to stylized model thickness.

Image of FIG. 3.
FIG. 3.

Measured air kerma rates (free in air), from fluoroscopy table and from the focal spot, for various clinically used field sizes with respect to peak tube potential for fluoroscopy mode of the Picker Vector II fluoroscopy unit.

Image of FIG. 4.
FIG. 4.

Measured free-in-air kerma values (normalized to mAs) for various clinically used field sizes with respect to peak tube potential for radiographic mode of operation for the Picker Vector II fluoroscopy unit. Measurements were taken from the tabletop of the fluoroscopy unit ( from the focal spot).

Image of FIG. 5.
FIG. 5.

Effective dose values for five VCUG patients using three different newborn computational models.

Image of FIG. 6.
FIG. 6.

Percentage of the total effective dose contributed by the risk-weighted organ dose values for the ovaries and colon in VCUG studies. Data are shown for five VCUG patients using three different newborn computational models: the stylized model (S), the tomographic model scaled to match the mass of the stylized model (Ts), and the tomographic scaled to match the mass of the patient (Tp).

Tables

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TABLE I.

Characteristics of selected VCUG studies.

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TABLE II.

The free-in-air Monte Carlo curve fit polynomial functions for various square equivalent field (SEF) sizes, where is the peak tube potential (kVp) and is the Monte Carlo simulated free-in-air kerma value of the simulated ion chamber (MeV/g) per launched photon for fluoroscopy mode of operation. All calculations were simulated from the source ( from the tabletop to replicate the experimental setup).

Generic image for table
TABLE III.

Radiographic free-in-air Monte Carlo curve fit polynomial functions for various peak tube potentials (kVp), where is the square equivalent field size in cm and is the Monte Carlo simulated free-in-air kerma value of the simulated ion chamber (MeV/g) per launched photon for radiographic mode of operation. All calculations were simulated from the source ( from the tabletop to replicate the experimental setup).

Generic image for table
TABLE IV.

Scaling factors for converting fluoroscopic peak tube potential and radiographic integrated tube current from clinical patients to the stylized and tomographic newborn computational models.

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TABLE V.

Results of the time-sequence analysis for the fluoroscopic portions of VCUG studies.

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TABLE VI.

Results of the time-sequence analysis for the radiographic portions of VCUG studies.

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TABLE VII.

Organ equivalent dose and effective dose values for VCUG Patient 1.

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TABLE VIII.

Organ equivalent dose and effective dose values for VCUG Patient 2.

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TABLE IX.

Organ equivalent dose and effective dose values for VCUG Patient 3.

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TABLE X.

Organ equivalent dose and effective dose values for VCUG Patient 4.

Generic image for table
TABLE XI.

Organ equivalent dose and effective dose values for VCUG Patient 5.

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/content/aapm/journal/medphys/34/1/10.1118/1.2402329
2006-12-26
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Organ and effective doses in newborns and infants undergoing voiding cystourethrograms (VCUG): A comparison of stylized and tomographic phantoms
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/34/1/10.1118/1.2402329
10.1118/1.2402329
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