A retrospective, semi-quantitative image quality analysis of cone beam computed tomography (CBCT) and MSCT in the diagnosis of distal radius fractures

Background Design of flow-diverter stents for flexibility, tractability, and low profile limits their radiopacity on conventional digital subtraction angiography. Cone-beam computed tomography (CBCT) offers higher spatial resolution for the evaluation of flow-diverter stents. However, CBCT requires optimal dilution and timing of contrast medium for simultaneous visualization of the stent, arterial lumen, and vessel wall. There are only limited data on the effects of different contrast dilutions on CBCT image quality in neurointerventional applications. Materials and methods In our institution, intra-arterial CBCTs were acquired during stent deployment and at follow-ups with 10% diluted contrast. We had recently started acquiring intra-arterial CBCTs with non-diluted contrast. Retrospective analysis of our flow-diverter data identified eight cases with different aneurysm locations who had intra-arterial CBCT with 10% diluted contrast immediately after flow-diverter stent deployment and with non-diluted contrast technique during follow-ups. For each case, the image quality between diluted and non-diluted contrast techniques was compared qualitatively by assessing stent visualization and quantitatively by plotting gray-scale intensity values along the vessel lumen. Results In two sets of CBCT images per each case, there was no substantial difference between diluted and non-diluted CBTC techniques for the evaluation of stent architecture and lumen opacification. Gray-scale intensity values perpendicular to the lumen revealed similar intensity values along the neighboring parenchyma, vessel wall, and lumen for the two different contrast techniques. Conclusion Intra-arterial CBCT angiography can be performed without contrast dilution and still achieve adequate image quality in certain cerebral aneurysms treated with flow diverter. The non-diluted contrast technique avoids the time loss during preparation of diluted contrast and installation of diluted contrast to the injector in angiography suites with a single power injector.

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Feasibility study of a s ynchronized-mo ving-g rid (SMOG) system to improve image quality in cone-beam computed tomography (CBCT)

Medical Physics ◽

10.1118/1.4736826 ◽

2012 ◽

Vol 39 (8) ◽

pp. 5099-5110 ◽

Cited By ~ 22

Author(s):

Lei Ren ◽

Fang-Fang Yin ◽

Indrin J. Chetty ◽

David A. Jaffray ◽

Jian-Yue Jin

Keyword(s):

Computed Tomography ◽

Image Quality ◽

Feasibility Study ◽

Cone Beam Computed Tomography ◽

Cone Beam ◽

Improve Image Quality

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Concomitant Carpal Injuries in Distal Radius Fractures: Retrospective Analysis by Plain Radiographs and Computed Tomography

Journal of the Korean Fracture Society ◽

10.12671/jkfs.2015.28.1.1 ◽

2015 ◽

Vol 28 (1) ◽

pp. 1 ◽

Cited By ~ 2

Author(s):

Chul-Hyun Cho ◽

Eun-Seok Son

Keyword(s):

Computed Tomography ◽

Retrospective Analysis ◽

Distal Radius ◽

Distal Radius Fractures ◽

Radius Fractures ◽

Plain Radiographs

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Accelerated 3D T2-Weighted SPACE Using Compressed Sensing for Paediatric Brain Imaging

10.21203/rs.3.rs-754283/v1 ◽

2021 ◽

Author(s):

Hyun Gi Kim ◽

Se Won Oh ◽

Dongyeob Han ◽

Jee Young Kim ◽

Gye Yeon Lim

Keyword(s):

White Matter ◽

Image Quality ◽

Compressed Sensing ◽

Brain Imaging ◽

Quality Analysis ◽

Acquisition Time ◽

Image Quality Analysis ◽

Space Group ◽

Quantitative Image ◽

Noise Ratio

Abstract The purpose of this study was to compare the image quality of the single-slab, 3D T2-weighted turbo-spin-eco sequence with high sampling efficiency (SPACE) with accelerated SPACE using compressed sensing (CS-SPACE) in paediatric brain imaging. A total of 116 brain MRI (53 in SPACE group and 63 in CS-SPACE group) were obtained from children aged 16 years old or younger. Quantitative image quality was evaluated using the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). The sequences were qualitatively evaluated for overall image quality, SNR, general artifact, cerebrospinal fluid (CSF)-related artifact and grey-white matter differentiation. The two sequences were compared for the total and for two age groups (< 24 months vs. ≥ 24 months). CS application in 3D T2-weighted imaging resulted in 8.5% reduction in scanning time. Quantitative image quality analysis showed higher SNR (Median [Interquartile range]; 29 [25] vs. 23 [14], P = .005) and CNR (0.231 [0.121] vs. 0.165 [0.120], P = .027) with CS-SPACE compared to SPACE. Qualitative image quality analysis showed better image quality with CS-SPACE for general artifact (P = .024) and CSF-related artifact (P < .001). CSF-related artifacts reduction was more prominent in the older age group (≥ 24 months). Overall image quality (P = .162), SNR (P = .726), and grey-white matter differentiation (P = .397) were comparable between SPACE and CS-SPACE. In conclusion, compressed sensing applied 3D T2-weighted images showed comparable or superior image quality compared to conventional images with reduced acquisition time for paediatric brain.

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Cone beam computed tomography – Measuring image quality of paranasal sinus imaging. A low-radiation alternative to conventional computed tomography ?

10.1055/s-0040-1710847 ◽

2020 ◽

Author(s):

P Kiss ◽

V Taucher ◽

A Wolf ◽

Ulrich Christian Moser ◽

A Andrianakis ◽

...

Keyword(s):

Computed Tomography ◽

Image Quality ◽

Paranasal Sinus ◽

Cone Beam Computed Tomography ◽

Cone Beam

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A Comparison of Intra-Observer and Inter-Observer Reliability of Plain Radiographs, Standard Computed Tomography Scans and Mobile Computed Tomography Scans in the Assessment of Distal Radius Fractures: A Cadaveric Study

Journal of Health Science and Medical Research ◽

10.31584/jhsmr.202078 ◽

2019 ◽

pp. 53

Author(s):

Sitthiphong Suwannaphisit ◽

Saowapar Yoykaew ◽

Chitchaya Suwanraksa ◽

Varah Yuenyongviwat ◽

Porames Suwanno ◽

...

Keyword(s):

Computed Tomography ◽

Distal Radius ◽

Distal Radius Fractures ◽

Observer Agreement ◽

Ct Scans ◽

Radius Fractures ◽

Plain Radiographs ◽

Observer Reliability ◽

Computed Tomography Scans ◽

Mobile Ct

Objective: Diagnosis of a distal end radius fracture relies on various imaging studies. However, the relative usefulness of these studies is still a matter of some controversy. The aim of this study was to compare the intra-observer and inter-observer reliability of plain radiographs, standard computed tomography (CT) scans and mobile CT scans in the assessment of distal radius fractures as categorized by the Fernandez classification method. The secondary objective was to compare the dosages of radiation between the different imaging modalities. Material and Methods: Sixteen fresh cadaveric wrist bones were used in this experimental study. The desired fractures were created in the bones to mimic Fernandez types I-V fractures and plain radiographs were taken in 4 views. Standard CT and mobile CT scans were also taken with the fractured bones in the same four positions. Interobserver reliability was assessed using Kappa statistics to determine the diagnostic consistency among the nine observers. Inter-observer agreement was assessed based on the Fernandez classification system diagnoses. Results: Overall, the inter-observer agreement was substantial for the Fernandez classifications (Kappa range 0.636 0.727) in all types of imaging. For intra-observer agreement, the analysis found higher agreement for both standard CT scans and mobile CT scans. The standard CT images imparted a higher average dose of radiation than both the mobile CT scans and the plain radiographs.Conclusion: The mobile CT scan can provide an alternative imaging method for precise diagnosis of distal end radius fractures, with the additional benefits of mobility and lower radiation exposure.

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