Investigation of the influence of image reconstruction filter and scan parameters on operation of automatic tube current modulation systems for different CT scanners

Sookpeng, Supawitoo; Martin, C J; Gentle, David J

doi:10.1093/rpd/ncu236

Cited by 24 publications

(22 citation statements)

References 11 publications

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“…It can therefore be difficult for operators of CT scanners to fully understand how different selections in the imaging protocol will affect the applied ATCM, such that the ATCM might not always be optimally used. Some studies 3,4 have emphasized the need for CT users to have full knowledge of how ATCM operates and to be aware of the differences between systems from various vendors. The way certain scan settings affect the ATCM from different vendors has been an area of interest for many years.…”

Section: Introductionmentioning

confidence: 99%

“…The way certain scan settings affect the ATCM from different vendors has been an area of interest for many years. 3,[5][6][7][8][9][10][11][12] The focus has been on the effect of a limited number of scan settings or on a specific vendor ATCM. However, an extensive study investigating the influence of all variable scan settings and covering all of the vendor implementations of ATCM is, to our knowledge, missing in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the impact of scan settings on automatic tube current modulation in CT using a novel phantom

Merzan¹,

Nowik²,

Poludniowski³

et al. 2017

BJR

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Objective: The aim of this study was to make a comprehensive evaluation of how variable scan settings can affect the performance of automatic tube current modulation (ATCM) in recent CT scanners from the four major manufacturers. Methods: A phantom was designed and manufactured for the purpose of evaluating ATCM. The phantom was scanned with four categories of systematically varied settings (scan projection radiograph, technique and reconstruction parameters and phantom miscentring). The performance of ATCM, in terms of applied tube current and noise uniformity, for the scans with varied settings was compared with a reference scan using subjective and quantitative approaches. Results: The ATCM implemented by each manufacturer is based on different principles and any affect to the performance of the ATCM, when varying scan settings, will manifest differently among the vendors. The results are summarized in four tables corresponding to the categories of varied settings. Conclusion: The developed phantom proved useful for evaluating the ATCM. It is important to understand how different implementations (vendor specific) of ATCM perform in order to make informed decisions about the selection of scan settings when designing protocols. The resulting tables can serve as a reference for understanding the different implementations of ATCM and highlight settings that should be taken into consideration when adjusting an imaging protocol. Advances in knowledge:The results from this work can serve as a reference for how changes in geometry or scan settings can affect the performance of ATCM, in terms of tube current and noise.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluating the impact of scan settings on automatic tube current modulation in CT using a novel phantom

Merzan¹,

Nowik²,

Poludniowski³

et al. 2017

BJR

View full text Add to dashboard Cite

show abstract

“…Modern scanners were developed to cover a wider beam collimation range per rotation of the CT X-ray tube. It would reduce the scanning time and radiation dose received by the patient [22]. The DLP value and effective diameter were dependent on the scan length and range, as stated in other studies [2,7,9,23].…”

Section: Discussionmentioning

confidence: 51%

Radiation Doses and Cancer Risk from CT Pulmonary Angiography Examinations

Harun¹,

Karim²,

Abbas³

et al. 2019

Preprint

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The present study aims to investigate radiation doses from Computed Tomography Pulmonary Angiography (CTPA) examinations based on the patient’s size and to estimate the probability of cancer risk induced from the examination. Data from 100 patients who had undergone CTPA examinations, such as scanning acquisition parameters, patient demography, as well as radiation dose exposure, were collected and analysed. All subjects which aged above 18 y/o were scanned using a Philips Brilliance 128 multi-detector CT (MDCT) scanner. The mean dose value for Volume Computed Tomography Dose Index (CTDIvol), Dose-Length Product (DLP) and effective dose (E) were 11.06 ± 7.17 mGy, 400.38 ± 259.10 mGy.cm and 8.68 ± 5.47 mSv respectively. In addition, with respective of patient’s effective diameter, the mean SSDE value for Group 1, Group 2 and Group 3 were 9.93 ± 3.89, 13.70 ± 9.04 and 22.29 ± 7.35, respectively. Cancer risk per million procedure was calculated based on te recommendation by the International Commission on Radiological Protection Publication 103 report. The organ dose and cancer risk attained for breast, lung and liver were 17.05 ± 10.40 mGy (194 per one million procedure), 17.55 ± 10.86 mGy (192 per one million procedure) and 15.04 ± 9.75 mGy (53 per one million procedure), respectively. In conclusion, CTDIvol underestimated, and SSDE was more accurate in describing the radiation dose. Lung and breast with larger lung effective diameter received the highest dose exposure which increase the probability of the cancer risk. Therefore, it is important to apply optimised protocols in order to reduce patient’s exposure during CTPA examination.

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“…Modern scanners were developed to cover a wider beam collimation range per rotation of the CT X-ray tube. This would reduce the scanning time and radiation dose received by the patient [16].…”

Section: Discussionmentioning

confidence: 99%

Patient-Specific Radiation Dose and Cancer Risk Estimate in Computed Tomography Pulmonary Angiography Examinations Based on Lung Effective Diameter

Harun¹,

Karim²,

Abbas³

et al. 2019

Preprint

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Computed Tomography (CT) scan examinations has greater demands especially in CT Pulmonary Angiography (CTPA) owing to the public and radiology personnel worries towards CT radiation exposure and risks. The aim of present study is to evaluate the comprehensive radiation exposure in computed tomography pulmonary angiography (CTPA) and its cancer risk. The records of 100 patients who had undergone CTPA were retrieved. The radiation dose exposure, scanning acquisition protocol as well as patient characteristics were noted. Radiation exposure were presented as Volume Computed Tomography Dose Index (CTDIvol), Size-Specific Dose Estimate (SSDE), Dose-Length Product (DLP), and effective dose (E) and organ dose. Effective cancer risk per million procedure was calculated by referring to the International Commission on Radiological Protection Publication 103. The CTDIvol, SSDE, DLP were comparable within different effective diameter groups. The average effective dose received by a patient was 8.68 mSv. The organ dose and effective cancer risk attained for breast, lung and liver were 17.05 ± 10.40 mGy (194 per one million procedure), 17.55 ± 10.86 mGy (192 per one million procedure) and 15.04 ± 9.75 mGy (53 per one million procedure), respectively. In conclusion, CTDIvol was undervalued and SSDE was more accurate in describing radiation dose exposure. The lungs and breast of subjects with large effective diameter were higher risk of developing cancer as they received the highest exposure. Therefore, extra safety measures should be considered for large-sized patients undergoing CTPA.Purpose: This study evaluates the comprehensive radiation exposure in computed tomography pulmonary angiography (CTPA) and its cancer risk.

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Investigation of the influence of image reconstruction filter and scan parameters on operation of automatic tube current modulation systems for different CT scanners

Cited by 24 publications

References 11 publications

Evaluating the impact of scan settings on automatic tube current modulation in CT using a novel phantom

Evaluating the impact of scan settings on automatic tube current modulation in CT using a novel phantom

Radiation Doses and Cancer Risk from CT Pulmonary Angiography Examinations

Patient-Specific Radiation Dose and Cancer Risk Estimate in Computed Tomography Pulmonary Angiography Examinations Based on Lung Effective Diameter

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