Comparison of the image qualities of filtered back-projection, adaptive statistical iterative reconstruction, and model-based iterative reconstruction for CT venography at 80 kVp

Kim, Jihun; Choo, Ki Seok; Moon, Tae Yong; Lee, Jun Woo; Jeon, Ung Bae; Kim, Tae Un; Hwang, Jae-Yeon; Yun, Myeong-Ja; Jeong, Dong Wook; Lim, Soo Jin

doi:10.1007/s00330-015-4060-1

Cited by 23 publications

(22 citation statements)

References 54 publications

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“…[ 3 ] Many studies have proved that low tube voltage was a practical approach applied to reduce radiation dose during CT acquisition. [ 7 – 9 ] Nakaura et al [ 10 ] has also confirmed that the radiation dose decreased by 20% when the tube voltage decreased from 120 to 80 kVp. However, a principal byproduct of low tube voltage is the loss of image quality because of the associated increase in image noise and higher susceptibility to beam-hardening artifacts, especially for those patients with high body mass index (BMI).…”

Section: Introductionmentioning

confidence: 91%

The combination of a reduction in contrast agent dose with low tube voltage and an adaptive statistical iterative reconstruction algorithm in CT enterography

et al. 2018

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To investigate the subjective and quantitative image quality and radiation exposure of CT enterography (CTE) examination performed at low tube voltage and low concentration of contrast agent with adaptive statistical iterative reconstruction (ASIR) algorithm, compared with conventional CTE.One hundred thirty-seven patients with suspected or proved gastrointestinal diseases underwent contrast enhanced CTE in a multidetector computed tomography (MDCT) scanner. All cases were assigned to 2 groups. Group A (n = 79) underwent CT with low tube voltage based on patient body mass index (BMI) (BMI < 23 kg/m2, 80 kVp; BMI ≥ 23 kg/m2, 100 kVp) and low concentration of contrast agent (270 mg I/mL), the images were reconstructed with standard filtered back projection (FBP) algorithm and 50% ASIR algorithm. Group B (n = 58) underwent conventional CTE with 120 kVp and 350 mg I/mL contrast agent, the images were reconstructed with FBP algorithm. The computed tomography dose index volume (CTDIvol), dose length product (DLP), effective dose (ED), and total iodine dosage were calculated and compared. The CT values, contrast-to-noise ratio (CNR), and signal-to-noise ratio (SNR) of the normal bowel wall, gastrointestinal lesions, and mesenteric vessels were assessed and compared. The subjective image quality was assessed independently and blindly by 2 radiologists using a 5-point Likert scale.The differences of values for CTDIvol (8.64 ± 2.72 vs 11.55 ± 3.95, P < .001), ED (6.34 ± 2.24 vs 8.52 ± 3.02, P < .001), and DLP (422.6 ± 149.40 vs 568.30 ± 213.90, P < .001) were significant between group A and group B, with a reduction of 25.2%, 25.7%, and 25.7% in group A, respectively. The total iodine dosage in group A was reduced by 26.1%. The subjective image quality did not differ between the 2 groups (P > .05) and all image quality scores were greater than or equal to 3 (moderate). Fifty percent ASIR-A group images provided lower image noise, but similar or higher quantitative image quality in comparison with FBP-B group images.Compared with the conventional protocol, CTE performed at low tube voltage, low concentration of contrast agent with 50% ASIR algorithm produce a diagnostically acceptable image quality with a mean ED of 6.34 mSv and a total iodine dose reduction of 26.1%.

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Section: Introductionmentioning

confidence: 91%

The combination of a reduction in contrast agent dose with low tube voltage and an adaptive statistical iterative reconstruction algorithm in CT enterography

et al. 2018

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“…SAFIRE, one of the recently introduced IR algorithms, has been shown to be helpful to reduce image noise and improve the image quality even in the low tube voltage setting at various clinical applications [ 19 , 33 – 39 ]. Although FBP has been widely used as the conventional CT image reconstruction algorithm for decades, its drawbacks are known to be relatively high levels of image noise and streaky artifacts, particularly when low dose CT acquisition is made [ 22 , 40 ]. In a recent study about 70 kVp CT angiography in children, Pei et al [ 36 ] have demonstrated that overall image quality including graininess, sharpness was significantly improved with SAFIRE, as well as a lower image noise and higher SNR and CNR were achieved with SAFIRE compared to FBP algorithm.…”

Section: Discussionmentioning

confidence: 99%

“…For subjective analysis, two radiologists with 4 and 9 years of experience independently evaluated the randomized, axial CTV images, blinded to the scanning protocol. The readers recorded scores using a previously designed template for the following characteristics [ 11 , 22 ]; image quality (5, excellent, optimal enhancement to allow confident diagnosis of the presence or absence of a clot, superior to a score of 4; 4, good, optimal enhancement to allow confident diagnosis of the presence or absence of a clot; 3, equivocal, enhancement sufficient for diagnosis; 2, poor, inadequate for diagnosis of the presence or absence of a clot; 1, unacceptable, no diagnosis possible); image noise (1, optimal, none perceivable; 2, moderate, but sufficient for diagnosis; 3, unacceptable, no diagnosis possible) (Figs 1 and 2 ).…”

Section: Methodsmentioning

confidence: 99%

Indirect CT Venography at 80 kVp with Sinogram-Affirmed Iterative Reconstruction Compared to 120 kVp with Filtered Back Projection: Assessment of Image Quality and Radiation Dose

Song

Park

et al. 2016

PLoS ONE

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ObjectiveTo evaluate the image quality and radiation dose of indirect computed tomographic venography (CTV) using 80 kVp with sinogram-affirmed iterative reconstruction (SAFIRE) and 120 kVp with filtered back projection (FBP).Materials and MethodsThis retrospective study was approved by our institution and informed consent was waived. Sixty-one consecutive patients (M: F = 27: 34, mean age 60 ± 16, mean BMI 23.6 ± 3.6 kg/m2) underwent pelvic and lower extremity CTVs [group A (n = 31, 120 kVp, reconstructed with FBP) vs. group B (n = 30, 80 kVp, reconstructed with SAFIRE)]. The vascular enhancement, image noise, contrast-to-noise ratio (CNR), and signal-to-noise ratio (SNR) were compared. Subjective image analysis for image quality and noise was performed by two radiologists. Radiation dose was compared between the two groups.ResultsCompared with group A, higher mean vascular enhancement was observed in the group B (group A vs. B, 118.8 ± 15.7 HU vs. 178.6 ± 39.6 HU, p < 0.001), as well as image noise (12.0 ± 3.8 HU vs. 17.9 ± 6.1 HU, p < 0.001) and CNR (5.1 ± 1.9 vs. 7.6 ± 3.0, p < 0.001). The SNRs were not significantly different in both groups (11.2 ± 4.8 vs. 10.8 ± 3.7, p = 0.617). There was no significant difference in subjective image quality between the two groups (all p > 0.05). The subjective image noise was higher in the group B (p = 0.036 in reader 1, p = 0.005 in reader 2). The inter-observer reliability for assessing subjective image quality was good (ICC 0.746~0.784, p < 0.001). The mean CT dose index volume (CTDIvol) and mean dose length product (DLP) were significantly lower in group B than group A [CTDIvol, 6.4 ± 1.3 vs. 2.2 ± 2.2 mGy (p < 0.001); DLP, 499.1 ± 116.0 vs. 133.1 ± 45.7 mGy × cm (p < 0.001)].ConclusionsCTV using 80 kVp combined with SAFIRE provides lower radiation dose and improved CNR compared to CTV using 120 kVp with FBP.

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“…[ 12 , 16 , 17 ] Most previous studies on low kilovoltage CTV have demonstrated increased iodine contrast in the veins, but relatively few have evaluated this with regard to DVT. [ 7 , 8 , 10 , 13 – 16 ] Moreover, the majority have made comparisons between 120 and 100 kVp, [ 8 , 11 , 14 ] or 120 and 80 kVp. [ 13 , 15 ] Only Cho et al [ 11 ] compared contrast of thrombi to veins in the 100 and 120 kVp settings and demonstrated higher contrast at 100 kVp in the clinical human study.…”

Section: Introductionmentioning

confidence: 99%

Improved detectability of thromboses of the lower limb using low kilovoltage computed tomography

et al. 2018

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To determine the utility of low kilovoltage computed tomographic venography (CTV) for the detection of deep venous thrombus in the lower limbs.Twenty-one thrombi in 19 enrolled patients were investigated in this retrospective study. Patients were initially scanned using CTV at 100 kVp, at the femur level, followed by an immediate switch to 80 kVp. We assessed the CT values of thrombi and veins and performed subjective evaluation for detecting thrombi using a 5-point scoring system: 1, unable to evaluate due to noise or artifacts; 2, equivocal venous thrombus; 3, possible venous thrombus; 4, probable venous thrombus; and 5, definite venous thrombus.Venous density on 100-kVp images (mean ± SD [standard deviation]: 122 ± 23 HU, 95% confidence interval [CI]: 111–133 Hounsfield unit [HU]) was significantly lower than that on 80-kVp images (136 ± 24 HU, 95% CI: 125–147 HU, P < .001). There was no significant difference in thrombi between 100-kVp images (55 ± 14 HU, 95% CI: 49–61 HU) and 80-kVp images (57 ± 16, 95% CI: 50–64 HU, P = .168). The thrombus to vein ratio on 100-kVp images (0.47 ± 0.20, 95% CI: 0.39–0.56) was significantly higher than that on 80-kVp images (0.44 ± 0.16, 95% CI: 0.37–0.51, P = .048). The mean 5-point score was significantly higher on the 80-kVp images (4.76) than on the 100-kVp images (4.45, P = .016).Lower kilovoltage CTV significantly improved thrombotic to venous contrasts in the lower limbs.

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Comparison of the image qualities of filtered back-projection, adaptive statistical iterative reconstruction, and model-based iterative reconstruction for CT venography at 80 kVp

Abstract: • MBIR provides superior image quality compared with FBP and ASIR • CTV at 80kVp with MBIR improves diagnostic confidence in diagnosing DVT • CTV at 80kVp with MBIR presents better image quality with low radiation.

Cited by 23 publications

References 54 publications

The combination of a reduction in contrast agent dose with low tube voltage and an adaptive statistical iterative reconstruction algorithm in CT enterography

The combination of a reduction in contrast agent dose with low tube voltage and an adaptive statistical iterative reconstruction algorithm in CT enterography

Indirect CT Venography at 80 kVp with Sinogram-Affirmed Iterative Reconstruction Compared to 120 kVp with Filtered Back Projection: Assessment of Image Quality and Radiation Dose

Improved detectability of thromboses of the lower limb using low kilovoltage computed tomography

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