Improving pulmonary vessel image quality with a full model-based iterative reconstruction algorithm in 80kVp low-dose chest CT for pediatric patients aged 0–6 years

Sun, Jiawei; Zhang, Zuo‐Feng; Hu, Di; Duan, Xiaomin; Peng, Yun

doi:10.1177/0284185114540884

Cited by 20 publications

(9 citation statements)

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“…In the abdominal CECT examination of children, we believe that the reason why ASIR100% images could be accepted was that there were obvious density differences among different tissues in images, and these obvious density differences were due to the application of 100kV low voltage. Under the same conditions, the CT value of contrast agent in low-tube-voltage images was signi cantly increased in comparison with that in high-tube-voltage images [19,22], which is conducive to distinguish different structures in CECT images. Even though low-concentration contrast agent (270mgI/ml) was used in this group of cases, which was 15.63% lower than that of the 320mgI/ml contrast agent commonly used before, it could still maintain a high contrast ratio under 100kV low-voltage condition.…”

Section: Discussionmentioning

confidence: 89%

Performance Evaluation of Two Iterative Reconstruction Algorithms--MBIR and ASIR, in Low Radiation Dose and Low Contrast Dose Abdominal CT in Children

Sun

Yang²,

Zhou

et al. 2019

Preprint

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Background The adverse effect of low-dose CT on image quality may be mitigated using iterative reconstructions. The purpose of this study was to evaluate the performance of the full model-based iterative reconstruction (MBIR) and adaptive statistical reconstruction (ASIR) algorithms in low radiation dose and low contrast dose abdominal contrast-enhanced CT (CECT) in children. Methods A total of 59 children (32 males and 27 females) undergoing low radiation dose (100kVp) and low contrast dose (270 mgI/ml) abdominal CECT were enrolled. The median age was 4.0 years (ranging from 0.3 to 13 years). The raw data were reconstructed with MBIR, ASIR and filtered back projection (FBP) algorithms into 6 groups (MBIR, 100%ASIR, 80%ASIR, 60%ASIR, 40%ASIR and FBP). The CT numbers, standard deviations, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of liver, pancreas, kidney and abdominal aorta were measured. Two radiologists independently evaluated the subjective image quality including the overall image noise and structure display ability on a 4-point scale with 3 being clinically acceptable. The measurements among the reconstruction groups were compared using one-way ANOVA. Results The overall image noise score and display ability were 4.00±0.00 and 4.00±0.00 with MBIR, and 3.27±0.33 and 3.25±0.43 with ASIR100%, respectively, which met the diagnostic requirement; other reconstructions couldn’t meet the diagnostic requirements. Compared with FBP images, the noise of MBIR images was reduced by 62.86%-65.73% for the respective organs (F=48.15-80.47, P<0.05), and CNR increased by 151.38%-170.69% (F=22.94-38.02, P<0.05). Conclusions MBIR or ASIR100% improves the image quality of low radiation dose and contrast dose abdominal CT in children to meet the diagnostic requirements, and MBIR has the best performance.

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Section: Discussionmentioning

confidence: 89%

Performance Evaluation of Two Iterative Reconstruction Algorithms--MBIR and ASIR, in Low Radiation Dose and Low Contrast Dose Abdominal CT in Children

Sun

Yang²,

Zhou

et al. 2019

Preprint

Self Cite

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“…However, a low tube voltage scan usually increases the image noise and, therefore, degrades the image quality due to the X-ray low-dose efficiency 30 . As a frequently used method, FBP reconstructs images from multi-angle images but limits further reducing the radiation dose and shows a deficiency in the image quality 14 .…”

Section: Discussionmentioning

confidence: 99%

“…The details of the 5-score method were as follows: 5-excellent image quality and contrast ratio, good vascular delineation, no artifacts, easy to diagnose; 4-good image quality and contrast ratio, normal vascular delineation, with a few artifacts, but adequate to diagnose; 3-satisfactory image quality and contrast ratio, some artifacts, the artery was not clearly displayed but was sufficient for the diagnosis; 2-weak image quality and contrast ratio, obvious artifact, the artery was not clearly displayed and was not sufficient for the diagnosis; 1-poor image quality and contrast ratio, severe artifacts, very hard to distinguish the small artery and could hardly make a diagnosis. More than 3 scores of the image quality were considered for the clinical diagnosis 30 . An example picture of the 5-score method used to evaluate subjective image quality is provided in the supplemental material (Supplemental Figure).…”

Section: Methodsmentioning

confidence: 99%

Impact of iterative model reconstruction combined with dose reduction on the image quality of head and neck CTA in children

Cheng

Xing

et al. 2018

Sci Rep

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This study aimed to evaluate the imaging quality of head and neck computed tomographic angiography (CTA) in pediatric patients at a lowered radiation dose by combining an iterative model reconstruction (IMR) with low voltage scanning. Eighty-three pediatric patients were randomized into two groups as follows: Group A (n = 42), 100 kV/50 ml contrast media (CM), using filtered back projection (FBP); and Group B (n = 41), 80 kV/30 ml CM, using IMR. The enhanced CT value of the arteries, the image noise, the signal-to-noise ratio (SNR)/contrast-to-noise ratio (CNR), the image quality, the effective radiation dose (ED) and the iodine intake were compared between the two groups. The mean ED and iodine intake of group B were reduced by 69.8% and 40.0%, respectively, compared to those of group A. The mean CT values of the arteries in group B were higher than those in group A (p < 0.01), whereas the image noise of group B was lower than that of group A (p < 0.01). Group B exhibited a better image quality and a higher mean CNR/SNR than that of group A (p < 0.01). Compared to FBP, IMR in head and neck CTA enables a significant reduction in the radiation dose while preserving the diagnostic image quality. Thus, IMR, combined with low tube voltage scanning, provided an excellent solution for improving the image quality of craniocervical vessels in children.

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“…28,29,31,[33][34][35]37,38,43,49,54,55 The extent of the noise reduction achieved however varies and depends on various factors, such as the type of IR algorithm used, the acquisition parameter settings, patient size and the type of CT examination performed. Newer generations of IR algorithms, such as MBIR and ASIR-V, allow for significantly increased noise reduction when compared to older algorithms such as ASiR, as demonstrated in the studies by Lim et al 20 and Ning et al…”

Section: Discussionmentioning

confidence: 99%

“…28,29,35,37,46,54 In particular, the amount of noise reduction was noted to increase as the size of the body habitus increased in the studies of obese patients. 54 This is a noteworthy finding with important implications, since radiation dose is par-ticularly of huge concern in these patient groups.…”

mentioning

confidence: 98%

Does Iterative Reconstruction Improve Image Quality and Reduce Dose in Computed Tomography?

Qiu¹,

Seeram²

2016

Radiol Open J

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CitationA total of 57 articles were categorized as either synopsis articles or performance evaluation clinical studies, where the latter was further divided into 6 sub-categories according to the type of IR algorithm examined. The results show that the use of IR algorithms reduces objective image noise, and at least preserves spatial resolution and low contrast detectability, even when dose is reduced. The findings are also applicable to specific patient groups, such as pediatrics and obese patients. In conclusion, there is a general consensus that IR algorithms can faithfully reduce radiation dose and improve image quality in CT in comparison with the FBP algorithm.

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Improving pulmonary vessel image quality with a full model-based iterative reconstruction algorithm in 80kVp low-dose chest CT for pediatric patients aged 0–6 years

Abstract: Compared to the conventional FBP reconstruction, the image quality and diagnostic performance for pulmonary vessels was significantly improved by the MBIR reconstruction in low-dose chest CT in children.

Cited by 20 publications

References 20 publications

Performance Evaluation of Two Iterative Reconstruction Algorithms--MBIR and ASIR, in Low Radiation Dose and Low Contrast Dose Abdominal CT in Children

Performance Evaluation of Two Iterative Reconstruction Algorithms--MBIR and ASIR, in Low Radiation Dose and Low Contrast Dose Abdominal CT in Children

Impact of iterative model reconstruction combined with dose reduction on the image quality of head and neck CTA in children

Does Iterative Reconstruction Improve Image Quality and Reduce Dose in Computed Tomography?

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