Image quality and radiation dose of low dose coronary CT angiography in obese patients: Sinogram affirmed iterative reconstruction versus filtered back projection

Wu, Rui; Schoepf, U. Joseph; Wu, Runze; Reddy, Ryan P.; Zhang, Chuanchen; Yu, Wei; Liu, Yi; Zhang, Zhaoqi

doi:10.1016/j.ejrad.2012.04.012

Cited by 101 publications

(56 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While SNR and CNR improved in SAFIRE images of patients weighing 75 kg and below, no improvements were noted in patients that were heavier than 75 kg, in a study which evaluated the performance of SAFIRE in coronary CT angiography. 45 The results are in line with a separate study by Wang et al 46 on obese patients with a body mass index (BMI) larger than 30 kg/m 2 . Another study investigating the use of SAFIRE in cervical spine CT examinations meanwhile noted that while increasing the iteration strength level of the SAFIRE algorithm improved visualization of the intervertebral discs and ligaments, the use of a higherstrength SAFIRE algorithm resulted in poorer visualization of soft tissues and trabecular bone.…”

Section: Performance Of Safire and Admire Algorithmssupporting

confidence: 80%

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

Qiu¹,

Seeram²

2016

Radiol Open J

View full text Add to dashboard Cite

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.

show abstract

Section: Performance Of Safire and Admire Algorithmssupporting

confidence: 80%

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

Qiu¹,

Seeram²

2016

Radiol Open J

View full text Add to dashboard Cite

show abstract

“…6,7,15 This study demonstrates that half-dose CT images reconstructed using SAFIRE were superior to standard-dose images in regards to subjective im- This study found that the sharpness of the and another group selected S2 and S3, as the optimal strength levels for low-dose lung CT. 16,17,19 These differences may be influenced by body mass index (BMI), given that image noise is higher in patients with higher BMIs. 25 The mean BMI in previous studies is slightly higher than in our study.…”

Section: Discussionmentioning

confidence: 95%

Performance of Half-dose Chest Computed Tomography in Lung Malignancy Using an Iterative Reconstruction Technique

Kang

Park

et al. 2017

KMJ

View full text Add to dashboard Cite

Objectives:The purpose of this study was to evaluate the performance of half-dose chest CT using an iterative reconstruction technique in patients with lung malignancies. Methods: The Dual-source CT scans were obtained and half-dose datasets were reconstructed with 5 different strengths in 38 adults with lung malignancies. Two radiologists graded subjective image quality; noise, contrast and sharpness at the central/peripheral lung, mediastinum and chest wall of the reconstructed half-dose images, compared with those of standard-dose images, using a three-point scale. A lesion assessment; lesion conspicuity and diagnostic confidence, was also performed. The quantitative image noises; contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR) were measured and compared with those of standard-dose images. Results: The subjective image noise in the half-dose images was less than that of the standard-dose images. The contrast in strengths 2 to 5 was superior, the sharpness of the lung parenchyma in strengths 3 to 5 was inferior, and the CNR/SNR in all strengths were higher than those of standard-dose images (P < 0.05). The improvement of subjective image noise and contrast, the decrease in sharpness, were correlated with strength level (P < 0.05). The lesion conspicuity in half-dose images of strengths 4 and 5 was decreased. The diagnostic confidence of the half-dose images of all strengths was comparable to that of the standard-dose images (P < 0.05). Conclusions: Half-dose chest CT images using an iterative reconstruction technique show decreased image noise, increased contrast, and diagnostic confidence comparable to standard-dose images. Images reconstructed with strength 2 and 3 appear to be the optimal choice in clinical practice.

show abstract

“…Studies confirm that IR reconstruction has better image quality for chest and abdominal scans, less image noise and potentially requires lower radiation doses than conventional FBP reconstruction (9-11). Studies have reported (12)(13)(14) that beam hardening-constructed defects can be reduced using IR, which is advantageous in cardiovascular imaging, and can be used to evaluate the condition of hard plaques and coronary arteries. SAFIRE reconstruction established based on IR technology from the Siemens Company consisted of two processes.…”

Section: Discussionmentioning

confidence: 99%

“…Numerous studies have been conducted on cCTA (14,16), but mostly limited on investigating scanning speed, scanning dose, contrast agent dose and other aspects. Few reports have focused on removing or reducing the constructed defects of calcium plaques.…”

Section: Discussionmentioning

confidence: 99%

Value of Sinogram-Affirmed Iterative Reconstruction for Evaluating Coronary Calcified Plaques

et al. 2016

View full text Add to dashboard Cite

Background: Coronary computed tomography angiography (cCTA) technology as a kind of non-traumatic examination has been widely used in clinical practice. There are major issues that need to be considered. One is how to obtain high quality images and at the same time effectively reduce the radiation dose. The second is coronary artery calcified plaque artifacts that seriously affect the depiction of plaque morphology and luminal stenosis. In case of dose reduction, these artifacts are more outstanding. Objectives: This study determined the value of sinogram-affirmed iterative reconstruction (SAFIRE) technology to assess coronarycalcified plaques. This value was compared with filtered back-projection (FBP) reconstruction. Patients and Methods: Sixty-three cases with calcified plaques diagnosed via coronary CT examination were selected. The mean CT-number, noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), number of calcium plaques, edges, lumen situation, and the subjective image quality ratings of the cases using FBP and SAFIRE1-SAFIRE5 (six groups) were analyzed and compared. Results: The subjective ratings of image quality using SAFIRE1-SAFIRE5 reconstructions were significantly higher than those using FBP, with SAFIRE3 achieving the highest rating. Compared with FBP reconstruction, the differences in noise, SNR, and CNR using SAFIRE1-SAFIRE5 were statistically significant (P < 0.05), with SAFIRE5 reconstruction achieving the highest SNR and CNR, and FBP reconstruction achieving the lowest. The revealed numbers of calcium plaques in the SAFIRE1-SAFIRE5 reconstruction groups were higher than that in the FBP reconstruction without significant differences in the number of calcium plaques among the SAFIRE1-SAFIRE5 groups (P > 0.05). Conclusion: SAFIRE reconstruction provided better coronary image quality and displayed the number, morphology, and surrounding lumen of calcium plaques more accurately than traditional FBP reconstruction, with SAFIRE3 achieving the best results.

show abstract

Image quality and radiation dose of low dose coronary CT angiography in obese patients: Sinogram affirmed iterative reconstruction versus filtered back projection

Cited by 101 publications

References 20 publications

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

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

Performance of Half-dose Chest Computed Tomography in Lung Malignancy Using an Iterative Reconstruction Technique

Value of Sinogram-Affirmed Iterative Reconstruction for Evaluating Coronary Calcified Plaques

Contact Info

Product

Resources

About