Evaluation of a dedicated MDCT protocol using iterative image reconstruction after cervical spine trauma

Geyer, Lucas L.; Körner, M.; Hempel, Rolf; Deák, Zsuzsanna; Mueck, Fabian G; Linsenmaier, Ulrich; Reiser, Maximilian; Wirth, Stéfan

doi:10.1016/j.crad.2012.11.025

Cited by 31 publications

(17 citation statements)

References 24 publications

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“…However, few studies focused on bone tissue, for which the contrast-to-noise ratio is naturally high. In this case, the advantage of iterative reconstruction might be limited (22)(23)(24). Spatial resolution is of special concern in bone imaging.…”

Section: Discussionmentioning

confidence: 99%

Impact of the Adaptive Statistical Iterative Reconstruction Technique on Radiation Dose and Image Quality in Bone SPECT/CT

et al. 2016

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The purpose of this study was to compare a routine bone SPECT/CT protocol using CT reconstructed with filtered backprojection (FBP) with an optimized protocol using low-dose CT images reconstructed with adaptive statistical iterative reconstruction (ASiR). Methods: In this prospective study, enrolled patients underwent bone SPECT/CT, with 1 SPECT acquisition followed by 2 randomized CT acquisitions: FBP CT (FBP; noise index, 25) and ASiR CT (70% ASiR; noise index, 40). The image quality of both attenuation-corrected SPECT and CT images was visually (5-point Likert scale, 2 interpreters) and quantitatively (contrast ratio [CR] and signal-to-noise ratio [SNR]) estimated. The CT dose index volume, dose-length product, and effective dose were compared. Results: Seventy-five patients were enrolled in the study. Quantitative attenuation-corrected SPECT evaluation showed no inferiority for contrast ratio and SNR issued from FBP CT or ASiR CT (respectively, 13.41 ± 7.83 vs. 13.45 ± 7.99 and 2.33 ± 0.83 vs. 2.32 ± 0.84). Qualitative image analysis showed no difference between attenuation-corrected SPECT images issued from FBP CT or ASiR CT for both interpreters (respectively, 3.5 ± 0.6 vs. 3.5 ± 0.6 and 3.6 ± 0.5 vs. 3.6 ± 0.5). Quantitative CT evaluation showed no inferiority for SNR between FBP and ASiR CT images (respectively, 0.93 ± 0.16 and 1.07 ± 0.17). Qualitative image analysis showed no quality difference between FBP and ASiR CT images for both interpreters (respectively, 3.8 ± 0.5 vs. 3.6 ± 0.5 and 4.0 ± 0.1 vs. 4.0 ± 0.2). Mean CT dose index volume, dose-length product, and effective dose for ASiR CT (3.0 ± 2.0 mGy, 148 ± 85 mGy⋅cm, and 2.2 ± 1.3 mSv) were significantly lower than for FBP CT (8.5 ± 3.7 mGy, 365 ± 160 mGy⋅cm, and 5.5 ± 2.4 mSv). Conclusion: The use of 70% ASiR blending in bone SPECT/CT can reduce the CT radiation dose by 60%, with no sacrifice in attenuation-corrected SPECT and CT image quality, compared with the conventional protocol using FBP CT reconstruction technique.

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Section: Discussionmentioning

confidence: 99%

Impact of the Adaptive Statistical Iterative Reconstruction Technique on Radiation Dose and Image Quality in Bone SPECT/CT

et al. 2016

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“…11 Another recent study by Komlosi et al 9 looked at the effect of ASiR on different neuroradiology CT studies. In their study, they could achieve approximately 17.9% radiation dose reduction in CT studies of the cervical spine without compromising the image quality.…”

Section: Discussionmentioning

confidence: 99%

“…9 Noise is iteratively reduced in the image domain. 10 There are very limited numbers of studies in the literature focusing on the role of ASiR in cervical spine CT. 9,11,12 In the present study, we compared the subjective image quality, image noise and radiation dose of cervical spine CT images using reduced dose protocol with ASiR vs reference dose protocol without ASiR.…”

Section: Introductionmentioning

confidence: 99%

The use of adaptive statistical iterative reconstruction (ASiR) technique in evaluation of patients with cervical spine trauma: impact on radiation dose reduction and image quality

Patro¹,

Chakraborty²,

Sheikh³

2016

BJR

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This study was presented in the Adaptive Statistical Iterative Reconstruction 2014: American Society of Spine Radiology Annual Symposium, 13-16 February 2014, Miami Beach, FL, USA, and received the best paper award in the oral presentation category.Objective: The aim of this study was to evaluate the impact of adaptive statistical iterative reconstruction (ASiR) technique on the image quality and radiation dose reduction. The comparison was made with the traditional filtered back projection (FBP) technique. Methods: We retrospectively reviewed 78 patients, who underwent cervical spine CT for blunt cervical trauma between 1 June 2010 and 30 November 2010. 48 patients were imaged using traditional FBP technique and the remaining 30 patients were imaged using the ASiR technique. The patient demographics, radiation dose, objective image signal and noise were recorded; while subjective noise, sharpness, diagnostic acceptability and artefacts were graded by two radiologists blinded to the techniques. Results: We found that the ASiR technique was able to reduce the volume CT dose index, dose-length product and effective dose by 36%, 36.5% and 36.5%, respectively, compared with the FBP technique. There was no significant difference in the image noise (p 5 0.39), signal (p 5 0.82) and signal-to-noise ratio (p 5 0.56) between the groups. The subjective image quality was minimally better in the ASiR group but not statistically significant. There was excellent interobserver agreement on the subjective image quality and diagnostic acceptability for both groups. Conclusion: The use of ASiR technique allowed approximately 36% radiation dose reduction in the evaluation of cervical spine without degrading the image quality. Advances in knowledge: The present study highlights that the ASiR technique is extremely helpful in reducing the patient radiation exposure while maintaining the image quality. It is highly recommended to utilize this novel technique in CT imaging of different body regions. INTRODUCTIONCT has now become one of the main modalities for routine imaging. The number of CT procedures has significantly increased in recent times with a growth rate of 10% every year.

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“…Compared to the yearly natural background radiation of approximately 2 mSv in Germany, the radiation dose of an MDCT of the wrist can be considered negligible as evaluated in a recent report [32] . In addition to that, the common issue of radiation exposure from MDCT has been countered by the implementation of iterative reconstruction techniques which allow for a significant dose reduction of up to 75% without loss of anatomical information [6,7,33] . We have not included magnetic resonance imaging [11,15] or bone scintigraphy [8,16,17] into our study design.…”

Section: A B C Dmentioning

confidence: 99%

“…It is considered as the most common fracture of the carpal bones [1][2][3] . Acute scaphoid fractures are widely seen in young, active adults [1][2][3][4][5] or sportsmen [6,7] who have experienced a fall on the outstretched hand. Usually, clinical examination and biplane radiography are the first diagnostic steps [8] .…”

Section: Introductionmentioning

confidence: 99%

Comparison of conventional radiography and MDCT in suspected scaphoid fractures

Behzadi

Karul

Henes

et al. 2015

WJR

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AIM:To determine the diagnostic accuracy and radiation dose of conventional radiography and multidetector computed tomography (MDCT) in suspected scaphoid fractures. METHODS:One hundred twenty-four consecutive patients were enrolled in our study who had suffered from a wrist trauma and showed typical clinical symptoms suspicious of an acute scaphoid fracture. All patients had initially undergone conventional radiography. Subsequent MDCT was performed within 10 d because of persisting clinical symptoms. Using the MDCT data as the reference standard, a fourfold table was used to classify the test results. The effective dose and impaired energy were assessed in order to compare the radiation burden of the two techniques. The Wilcoxon test was performed to compare the two diagnostic modalities. RESULTS:Conventional radiography showed 34 acute fractures of the scaphoid in 124 patients (42.2%). Subsequent MDCT revealed a total of 42 scaphoid fractures. The sensitivity of conventional radiography for scaphoid fracture detection was 42.8% and its specificity was 80% resulting in an overall accuracy of 59.6%. Conventional radiography was significantly inferior to MDCT (P < 0.01) concerning scaphoid

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Evaluation of a dedicated MDCT protocol using iterative image reconstruction after cervical spine trauma

Cited by 31 publications

References 24 publications

Impact of the Adaptive Statistical Iterative Reconstruction Technique on Radiation Dose and Image Quality in Bone SPECT/CT

Impact of the Adaptive Statistical Iterative Reconstruction Technique on Radiation Dose and Image Quality in Bone SPECT/CT

The use of adaptive statistical iterative reconstruction (ASiR) technique in evaluation of patients with cervical spine trauma: impact on radiation dose reduction and image quality

Comparison of conventional radiography and MDCT in suspected scaphoid fractures

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