Comparison of 640-slice Aquilon ONE CT scanner’s measured dosimetric parameters with ICRP dose reference levels for head, chest and abdominal CT examinations

Anim-Sampong, S.; Antwi, William Kwadwo; Botwe, Benard Ohene; Boateng, Rosemary S.

doi:10.1186/s40886-016-0019-4

Cited by 9 publications

(8 citation statements)

References 21 publications

(25 reference statements)

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“…The estimated mean values of the CT dose descriptors were comparable with the literature. The results of this study are consistent with the findings in a Ghanaian study in which Anim-Sampong et al [11] reported CT doses comparable with the International Commission on Radiological Protection (ICRP) DRLs. The reason for the similarity could be attributed to the fact that there is no significant change in the adult head dimensions between different people in one population.…”

Section: Dosimetrysupporting

confidence: 91%

Development of size-specific dose estimates for common computed tomography examinations: a study in Ghana

Botwe

Anim-Sampong²,

Nkansah³

2023

J. Radiol. Prot.

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Purpose: This study determined the size-specific dose estimate (SSDE) of computed tomography (CT) examinations and derived mathematical expressions for dose output estimation and optimization in a teaching hospital in Ghana. Methods: Demographic and scanner output indices including CTDIvol and DLP for adult head, chest and abdominopelvic (ABP) CT examinations carried out at the hospital from 2018 to 2020 were retrieved from its CT scanner machine. Other indices such as antero-posterior (AP) diameter (DAP), lateral diameter (DL) and diagonal diameter (Ddia) of the patients’ bodies were measured on the mid-slice axial image using a digital caliper. The effective diameter (Deff) was then calculated as the square root of the product of the DAP and DL. The SSDEs were calculated as the product of the CTDIvol and the size-specific conversion factors obtained from the American Association of Physicists in Medicine’s (AAPM) Report 204. Regression analyses were performed to find the relationship between SSDE and the various parameters to derive mathematical equations for the dose estimations. Results: There were more female samples (n = 468, 56.3%) than males (n = 364, 43.7%) for each CT procedure. The SSDEs and size-specific diagnostic reference levels (SSDRLs) were: head (83.9 mGy; 86.9 mGy), chest (8.1 mGy; 8.7 mGy) and ABP (8.4 mGy; 9.2 mGy). The variations between CTDIvol and SSDEs for head (2.50%), chest (25.9%), and and ABP (26.2%) showed underestimation of radiation dose to patients especially in chest and ABP examinations if CTDIvol is used to report patient doses. The SSDEs of the chest and ABP CT examinations showed linear correlations with the CTDIvol. The estimated values could be used to optimize radiation doses in the CT facility. Conclusion: The SSDE and SSDRLs for head, chest and ABP CT examinations have been developed at a teaching hospital in Ghana. The SSDEs of chest and ABP examinations showed linear correlations with the CTDIvol and hence, can be calculated using the mathematically derived equations in the study.

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Section: Dosimetrysupporting

confidence: 91%

Development of size-specific dose estimates for common computed tomography examinations: a study in Ghana

Botwe

Anim-Sampong²,

Nkansah³

2023

J. Radiol. Prot.

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“…The measured DLP dose for pediatric CT head scans was 406.59 ± 71.121 mGy. This measurement was lower than the ICRP DRL value of 56.11 ± 12.843 for pediatrics 6 …”

contrasting

confidence: 60%

“…Anim-Sampong et al 6 compared CTDI and DLP measurements using ICRP as the main reference and other different references. Their study design was prospective and retrospective for 350 pediatric and adult patients referred for CT examinations of the head, chest, and abdomen to measure CTDI and DLP using the Aquilion ONE CT scanner.…”

mentioning

confidence: 99%

“…This measurement was lower than the ICRP DRL value of 56.11 ± 12.843 for pediatrics. 6 New Australian legislation recommends that local DRLs (LDRLs) must be established to monitor the performance and dose of CT examinations. A study was carried out to provide pediatric DRL values based on weight and to use both the 16-cm and 32-cm diameter CT dose measurement phantom sizes.…”

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confidence: 99%

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Computed Tomography Diagnostic Reference Levels for Brain, Chest, and Abdominal/Pelvis Examinations

et al. 2022

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Radiation dosage variance is one of the topics that arise when dealing with computed tomography (CT) devices within medical imaging centers. In this article, a review was done to enlighten the causes of such dosage variance and the degree of variation for pediatric patients. The article focuses on the diagnostic reference levels (DRLs) for the brain, chest, and abdomen CT images. The reviewed studies were categorized depending on the type of the cases of pediatric patients, which include head, chest, and abdominal examinations. There were 9 studies using human data, 1 with phantom data, and 2 with combined human and phantom data. The dosage indices used in the studies were the DRLs, which were used as a key comparison between studies. The classification was likewise done at the expense of the radiation dose, with a secondary classification based on the patients' age, weight, and size. The type of scanner, differences in protocols, variations in patients, and variations in research design are all considered sources of variation. The following dosage indices were found in different combinations: volume CT dose index (CTDIvol), dose length product (DLP), and size-specific dose estimate (SSDE). The use of different dose indices limited the dose comparison between 11 studies.

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“…With regards to slice capabilities 4-, 16-and 32-slices were initially common but now represent obsolete technology with 64-and 128-slice machines readily available. At the top end of the commercial market, 640-slice machines are available [146]. Dual source CT also exists to enable tissues with similar HU to be better differentiated [142].…”

Section: Brief History and Recent Advancesmentioning

confidence: 99%

Facial soft tissue thicknesses in craniofacial identification: Data collection protocols and associated measurement errors

Stephan

Meikle

Freudenstein

et al. 2019

Forensic Science International

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Facial soft tissue thicknesses (FSTT) form a key component of craniofacial identification methods, but as for any data, embedded measurement errors are highly pertinent. These in part dictate the effective resolution of the measurements. As herein reviewed, measurement methods are highly varied in FSTT studies and associated measurement errors have generally not been paid much attention. Less than half (44%) of 95 FSTT studies comment on measurement error and not all of these provide specific quantification. Where informative error measurement protocols are employed (5% of studies), the mean error magnitudes range from 3% to 45% rTEM and are typically in the order of 10-20%. These values demonstrate that FSTT measurement errors are similar in size to (and likely larger than) the magnitudes of many biological effects being chased. As a result, the attribution of small millimeter or submillimeter differences in FSTT to biological variables must be undertaken with caution, especially where they have not been repeated across different studies/samples. To improve the integrity of FSTT studies and the reporting of FSTT measurement errors, we propose the following standard:(1) calculate the technical error of measurement (TEM or rTEM) in any FSTT research work; (2) assess the error embedded in the full data collection procedure; and (3) conduct validation testing of FSTT means proposed for point estimation prior to publication to ensure newly calculated FSTT means provide improvements. In order to facilitate the latter, a freely available R tool TDValidator that uses the C-Table data for validation testing is herein provided.

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Comparison of 640-slice Aquilon ONE CT scanner’s measured dosimetric parameters with ICRP dose reference levels for head, chest and abdominal CT examinations

Cited by 9 publications

References 21 publications

Development of size-specific dose estimates for common computed tomography examinations: a study in Ghana

Development of size-specific dose estimates for common computed tomography examinations: a study in Ghana

Computed Tomography Diagnostic Reference Levels for Brain, Chest, and Abdominal/Pelvis Examinations

Facial soft tissue thicknesses in craniofacial identification: Data collection protocols and associated measurement errors

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