Organ dose in cardiac dual-energy computed tomography: a Monte Carlo study

Pakravan, Delaram; Mofrad, Farshid Babapour; Deevband, Mohammad Reza; Ghorbani, Mahdi; Pouraliakbar, Hamidreza

doi:10.1007/s13246-021-01098-9

Cited by 2 publications

(6 citation statements)

References 19 publications

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“…However, in this case, the k -factor must be recalculated. In a previous study on the field of dosimetry in DECT [ 15 ], the same value for the k -factor in the cardiac protocol with a pitch of 0.21 was obtained for the male phantom, which was about 12% lower for the female phantom.…”

Section: Discussionmentioning

confidence: 53%

“…No human participants were involved in this study, and the simulations and calculations were only performed on phantoms. To simulate and validate the CT scanner, a previous study in this field [ 15 ] was used as a basis that utilized the MCNP-FBSM (Fan-Beam Source Model) code for data acquisition to simulate a Siemens Somatom Definition Flash (Siemens Healthineers, Erlangen, Germany) dual-source DECT scanner [ 16 ]. The developed FBSM Monte Carlo (MC) method was validated for CT dosimetry [ 17 ] and also used for the definition of the fan beam.…”

Section: Methodsmentioning

confidence: 99%

“…where E and ST are energy and slice thickness, respectively. To validate the simulation, the calculated CTDI values were compared with the corresponding measured values, and a high level of agreement was observed between the CTDI values obtained from the simulation and those obtained from the measurements [ 15 ].…”

Section: Methodsmentioning

confidence: 99%

“…After validation and reliability of the simulation code in the previous study [ 15 ], the male and female MIRD ORNL phantoms were defined at the center of the DECT gantry, and the organ doses were estimated by applying the following conditions: 100 and 140 kVp tube energies, the pitch of 0.7, and 3.84 cm beam collimation. The scan parameters for liver, chest, cardiac, and abdomen-pelvis imaging protocols for DECT in the simulations of male and female ORNL phantoms are presented in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

“…where DLP is the product of the CTDI vol and the scan length. The CTDI vol was taken from in-phantom measurements conducted in a previous study for a pitch of 0.7 [ 15 ] to calculate the DLP.…”

Section: Methodsmentioning

confidence: 99%

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Presentation of Organ Dose and Effective Dose Conversion Factors in Dual-Energy Computed Tomography: A Monte Carlo Simulation Study

2023

J Biomed Phys Eng

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Background: The same conversion factors ( k -factors) of Single CT (SECT) are applied to estimate the Effective Dose (ED) in Dual Energy Computed Tomography (DECT). However, k -factors for different organs need independently validating for DECT, due to the different conditions in DECT. Objective: This study aimed to calculate organ dose and k -factors in different imaging protocols (liver, chest, cardiac, and abdomen) for male and female phantoms. Material and Methods: This Monte Carlo Simulation study used Monte Carlo N-Particle (MCNP) code for modeling a Siemens Somatom Definition Flash dual-source CT scanner. The organ dose, dose length product, and k -factors were calculated for the Medical Internal Radiation Dose (MIRD) of male and female phantoms. Results: For the male phantom, the k -factors for the liver, chest, cardiac, and abdomen-pelvis imaging protocols are equal to 0.020, 0.012, 0.016, and 0.014 mSv.mGy −1 cm −1 , respectively. For the female phantom, the corresponding values are equal to 0.026, 0.023, 0.036, and 0.018, respectively. These values for DECT are different from those corresponding values for SECT, especially for the female phantom. Conclusion: The calculated k -factors for DECT can be used as reference values for the estimation of ED in DECT.

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Section: Discussionmentioning

confidence: 53%