Can the same dose data be estimated from phantoms with different anatomies?

Shahri, Keyhandokht Karimi; Rafat-Motavalli, Laleh; Hakimabad, Seyyed Hashem Miri

doi:10.1051/radiopro/2013071

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…The results of this work support the Kalender statement, that for a given set of exposure parameters, the dose in the patient or phantom will vary greatly depending on the amount of tissues and fat layers around it, which attenuate the radiation intensity [ 24 ]. In addition, it is also asserted that there is a decrease in the dose absorbed by an organ by increasing the protective tissue layers, as shown by Karimi Shahri et al [ 25 ]. Therefore, it seems that depth distributions of organs and their protection from external radiation are two competing factors; so that, for different organs, based on their shapes and locations, one of them will dominate the other.…”

Section: Discussionmentioning

confidence: 99%

Dose estimations for Iranian 11-year-old pediatric phantoms undergoing computed tomography examinations

2015

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In order to establish an organ and effective dose database for Iranian children undergoing computed tomography (CT) examinations, in the first step, two Iranian 11-year-old phantoms were constructed from image series obtained from CT and magnetic resonance imaging (MRI). Organ and effective doses for these phantoms were calculated for head, chest, abdomen–pelvis and chest–abdomen–pelvis (CAP) scans at tube voltages of 80, 100 and 120 kVp, and then they were compared with those of the University of Florida (UF) 11-year-old male phantom. Depth distributions of the organs and the mass of the surrounding tissues located in the beam path, which shield the internal organs, were determined for all phantoms. From the results, it was determined that the main organs of the UF phantom receive smaller doses than the two Iranian phantoms, except for the urinary bladder of the Iranian girl phantom. In addition, the relationship between the anatomical differences and the size of the dose delivered was also investigated and the discrepancies between the results were examined and justified.

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Section: Discussionmentioning

confidence: 99%

Dose estimations for Iranian 11-year-old pediatric phantoms undergoing computed tomography examinations

2015

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“…After that, many studies focused on dose estimation for reference human models (50th percentile). Although using these models provided good estimations of organ and tissue doses, the results of some investigations confirmed the dependency of radiation dose on whole-body properties such as weight and height, trunk shape, thickness of fatty tissue [8,9]. Considering the differences in the whole-body properties of various individuals, which cause uncertainties in the dose values obtained using ICRP Reference Man, Johnson et al developed a set of hybrid phantoms covering different height/weight percentiles [10].…”

Section: Introductionmentioning

confidence: 99%

Studying the lung dose uncertainty during chest CT scans using phantoms with statistical lung volumes and shapes

2019

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In recent years, there has been increasing interest in constructing a series of deformable phantoms which follow the statistical distributions of some anatomical variations, known as ‘statistical phantoms’. The main purpose of this study was to develop statistical phantoms by considering the variations in lung volume and shape, in order to evaluate the lung dose uncertainty for individuals undergoing chest computed tomography. Calculations were performed for 100 statistical lung volume phantoms and 70 statistical lung shape phantoms at tube voltages of 80 and 120 kVp, with the use of Monte Carlo MCNP code. The obtained results indicate that dose fluctuations for low tube voltage (80 kVp) are higher than those at 120 kVp. Moreover, it shows that the impact of statistical variations in lung volume on dose discrepancy (5% to 7%) is higher than the impact of statistical lung shape variations (around 2%).

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Effects of computational phantoms on the effective dose and two-dosimeter algorithm for external photon beams

Karimi-Shahri

Rafat-Motavalli

Hakimabad

et al. 2016

Applied Radiation and Isotopes

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Can the same dose data be estimated from phantoms with different anatomies?

Cited by 9 publications

References 28 publications

Dose estimations for Iranian 11-year-old pediatric phantoms undergoing computed tomography examinations

Dose estimations for Iranian 11-year-old pediatric phantoms undergoing computed tomography examinations

Studying the lung dose uncertainty during chest CT scans using phantoms with statistical lung volumes and shapes

Effects of computational phantoms on the effective dose and two-dosimeter algorithm for external photon beams

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