A comparison of the CT-dosimetry software packages based on stylized and boundary representation phantoms

Saeed, M.K.

doi:10.1016/j.radi.2020.02.011

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…Effective dose estimates conducted by different dosimetry software have noted differences of 25% between software and as high as 55% and 210% for soft tissue organ and skeletal tissue dose estimates. This finding is consistent with studies looking at variation in effective dose estimates in the adult population 21,40 . However, only a single published study has compared a subset of TLD infant organ doses to computational dosimetry software and only for a single acquisition protocol.…”

Section: Discussionsupporting

confidence: 85%

“…This finding is consistent with studies looking at variation in effective dose estimates in the adult population. 21 , 40 However, only a single published study has compared a subset of TLD infant organ doses to computational dosimetry software and only for a single acquisition protocol. When normalizing organ doses to CTDI vol , most organ doses align with measurement uncertainty between the studies.…”

Section: Discussionmentioning

confidence: 99%

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Comparison of organ and effective dose estimations from different Monte Carlo simulation‐based software methods in infant CT and comparison with direct phantom measurements

Lawson

Berk

Badawy

et al. 2022

J Applied Clin Med Phys

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Computational dosimetry software is routinely used to evaluate the organ and effective doses from computed tomography (CT) examinations. Studies have shown a significant variation in dose estimates between software in adult cohorts, and few studies have evaluated software for pediatric dose estimates. This study aims to compare the primary organ and effective doses estimated by four commercially available CT dosimetry software to thermoluminescent dosimeter (TLD) measurements in a 1-year-old phantom. Methods: One hundred fifteen calibrated LiF (Mg, Cu, P)-TLD 100-H chips were embedded within an anthropomorphic phantom representing a 1-year-old child at positions that matched the approximate location of organs within an infant. The phantom was scanned under three protocols, each with whole-body coverage. The mean absorbed doses from 25 radiosensitive organs and skeletal tissues were determined from the TLD readings. Effective doses for each of the protocols were subsequently calculated using ICRP 103 formalism. Dose estimates by the four Monte Carlo-based dose calculation systems were determined and compared to the directly measured doses. Results: Most organ doses determined by computation dosimetry software aligned to phantom measurements within 20%. Additionally, comparisons between effective doses are calculated using computational and direct measurement methods aligned within 20% across the three protocols. Significant variances were found in bone surface dose estimations among dosimetry methods, likely caused by differences in bone tissue modeling. Conclusion: All four-dosimetry software evaluated in this study provide adequate primary organ and effective dose estimations. Users should be aware, however, of the possible estimated uncertainty associated with each of the programs.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Comparison of organ and effective dose estimations from different Monte Carlo simulation‐based software methods in infant CT and comparison with direct phantom measurements

Lawson

Berk

Badawy

et al. 2022

J Applied Clin Med Phys

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“…Previously, limited knowledge of these radiation exposure doses was available despite their importance in estimating the risk posed by CT examinations. Numerous studies have used anthropomorphic and/or cylindrical acrylic phantoms to estimate radiation exposure doses for individual organs during CT examinations; however, other studies reported significant variation according to the type of simulation software 26 . Other studies have directly measured CT organ doses in human subjects.…”

Section: Discussionmentioning

confidence: 99%

Direct measurement of radiation exposure dose to individual organs during diagnostic computed tomography examination

Yamashita

Higashino

Hayashi

et al. 2021

Sci Rep

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Ionizing radiation from Computed tomography (CT) examinations and the associated health risks are growing concerns. The purpose of this study was to directly measure individual organ doses during routine clinical CT scanning protocols and to evaluate how these measurements vary with scanning conditions. Optically stimulated luminescence (OSL) dosimeters were surgically implanted into individual organs of fresh non-embalmed whole-body cadavers. Whole-body, head, chest, and abdomen CT scans were taken of 6 cadavers by simulating common clinical methods. The dosimeters were extracted and the radiation exposure doses for each organ were calculated. Average values were used for analysis. Measured individual organ doses for whole-body routine CT protocol were less than 20 mGy for all organs. The measured doses of surface/shallow organs were higher than those of deep organs under the same irradiation conditions. At the same tube voltage and tube current, all internal organ doses were significantly higher for whole-body scans compared with abdominal scans. This study could provide valuable information on individual organ doses and their trends under various scanning conditions. These data could be referenced and used when considering CT examination in daily clinical situations.

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“…As the years have progressed, the need for THA in younger patients has become much more common, highlighting the need for longer-lasting implants. Since 75% of hip implants are expected to last between 15 and 20 years (27), revision hip surgery can be anticipated in patients under the age of 55 (28,29), which is further confirmed by their higher revision rate. To lower the risk of implant failure, precise pre-operative planning of THA is thus crucial.…”

Section: The Defining Factors Of An Optimal Ct Scan For Tha Planningmentioning

confidence: 86%

The variability of CT scan protocols for total hip arthroplasty: a call for harmonisation

Ramesh,

Di Laura,

Henckel

et al. 2023

EFORT Open Reviews

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CT is the principal imaging modality used for the pre-operative 3D planning and assessment of total hip arthroplasty (THA). The image quality offered by CT has a radiation penalty to the patient. Higher than necessary radiation exposure is of particular concern when imaging young patients and women of childbearing age, due to the greater risk of radiation-induced cancer in this group. A harmonised low-dose CT protocol is needed, evidenced by the huge variability in the 17 protocols reviewed. The majority of the protocols were incomplete, leading to uncertainty among radiographers when performing the scans. Only three protocols (20%) were optimised for both ‘field of view’ and image acquisition parameters. 10 protocols (60%) were optimised for ‘field of view’ only. These protocols included imaging of the relevant landmarks in the bony pelvis in addition to the knees – the reference for femoral anteversion. CT parameters, including the scanner kilovoltage (kV), milliamperage–time product (mAs) and slice thickness, must be optimised with a ‘field of view’ that includes the relevant bony landmarks. The recommended kV and mAs values were very wide ranging from 100 to 150 and from 100 to 250, respectively. The large variability that exists amongst the CT protocols illustrates the need for a more consistent low-dose CT protocol for the planning of THA. This must provide an optimal balance between image quality and radiation dose to the patient. Current CT scanners do not allow for measurements of functional pelvic orientation and additional upright imaging modalities are needed to augment them.

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A comparison of the CT-dosimetry software packages based on stylized and boundary representation phantoms

Cited by 8 publications

References 12 publications

Comparison of organ and effective dose estimations from different Monte Carlo simulation‐based software methods in infant CT and comparison with direct phantom measurements

Comparison of organ and effective dose estimations from different Monte Carlo simulation‐based software methods in infant CT and comparison with direct phantom measurements

Direct measurement of radiation exposure dose to individual organs during diagnostic computed tomography examination

The variability of CT scan protocols for total hip arthroplasty: a call for harmonisation

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