Influence of orthodontic brackets and permanent retainers on the diagnostic image quality of MRI scans: A preliminary study

With the introduction of picture and archiving communicating systems an alternative image display for the wards might be a personal computer (PC). The intention with this study was to evaluate the diagnostic image quality of the monitor of a PC compared to that of a workstation. Eighty-five digital radiographs of a chest phantom with simulated tumors in the mediastinum and right lung were saved on optical discs. The examinations were reviewed by 4 radiologists on a monitor at a workstation and at a PC, and receiver operating characteristic (ROC) curves were constructed. No significant difference was found between performance of the PC and the workstation.

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Bilateral contrast-enhanced MR angiography of the hand: diagnostic image quality of accelerated MRI using echo sharing with interleaved stochastic trajectories (TWIST)

European Radiology ◽

10.1007/s00330-010-2002-5 ◽

2010 ◽

Vol 21 (5) ◽

pp. 1026-1033 ◽

Cited By ~ 7

Author(s):

Jan Thorsten Winterer ◽

P. Blanke ◽

A. Schaefer ◽

G. Pache ◽

M. Langer ◽

...

Keyword(s):

Image Quality ◽

Mr Angiography ◽

Diagnostic Image Quality ◽

Diagnostic Image ◽

Contrast Enhanced ◽

Accelerated Mri

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The Impact of Different Types of Orthodontic Appliances and Its Location in Producing CT Scan Artefacts

Sains Malaysiana ◽

10.17576/jsm-2021-5010-19 ◽

2021 ◽

Vol 50 (10) ◽

pp. 3067-3075

Author(s):

Mahmud Mohammed ◽

Norma Ab. Rahman ◽

Ahmad Hadif Zaidin Samsudin

Keyword(s):

Stainless Steel ◽

Image Quality ◽

Orthodontic Brackets ◽

Diagnostic Image Quality ◽

Orthodontic Appliances ◽

Diagnostic Image ◽

Different Types ◽

Polycrystalline Ceramic ◽

The Mean ◽

Ceramic Bracket

Fixed orthodontic appliances can produce metal artefacts in CT images which may degrade the diagnostic image quality. The study aimed to evaluate the artefacts based on the types and location of the metallic and non-metallic orthodontic brackets. This is an in-vitro cross-sectional study. Four different types of orthodontic brackets (stainless steel, titanium, monocrystalline, and polycrystalline ceramic bracket) were bonded consecutively in four different locations of the cadaveric skull. All scans were performed by a single operator using the same CT machine followed by a standard scanning protocol. Artefact intensity for all data sets was quantified by calculating the standard deviation (SD) of the grey values within the dataset by following a standard method. The One-way ANOVA Bonferroni test was used for the data analysis. The mean artefact score of the stainless steel bracket was significantly (p < 0.001) high in comparison with other types of the orthodontic brackets. Besides, the mean artefact score was significantly (p=0.002) low when orthodontic brackets were placed unilaterally. Stainless steel brackets produced a significant amount of noise in CT images which can degrade the diagnostic image quality. Thus, the polycrystalline ceramic bracket can be a better alternative of stainless steel brackets for patient need frequent CT scan.

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Computerized method for evaluating diagnostic image quality of calcified plaque images in cardiac CT: Validation on a physical dynamic cardiac phantom

Medical Physics ◽

10.1118/1.3495684 ◽

2010 ◽

Vol 37 (11) ◽

pp. 5777-5786 ◽

Cited By ~ 3

Author(s):

Martin King ◽

Zachary Rodgers ◽

Maryellen L. Giger ◽

Dianna M. E. Bardo ◽

Amit R. Patel

Keyword(s):

Image Quality ◽

Cardiac Ct ◽

Diagnostic Image Quality ◽

Diagnostic Image ◽

Computerized Method ◽

Cardiac Phantom ◽

Calcified Plaque

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Safety and diagnostic image quality of iopromide: results of a large non-interventional observational study of European and Asian patients (IMAGE)

Acta Radiologica ◽

10.1258/ar.2011.110359 ◽

2012 ◽

Vol 53 (2) ◽

pp. 179-186 ◽

Cited By ~ 15

Author(s):

Petra Palkowitsch ◽

Philipp Lengsfeld ◽

Kathrin Stauch ◽

Christian Heinsohn ◽

Soon Tae Kwon ◽

...

Keyword(s):

Image Quality ◽

Observational Study ◽

Diagnostic Image Quality ◽

Diagnostic Image ◽

Asian Patients

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Stochastic Capsule Endoscopy Image Enhancement

10.20944/preprints201804.0333.v1 ◽

2018 ◽

Author(s):

Ahmed Mohammed ◽

Ivar Farup ◽

Marius Pedersen ◽

Øistein Hovde ◽

Sule Yildirim

Keyword(s):

Image Quality ◽

Capsule Endoscopy ◽

Rank Order ◽

Subjective Evaluation ◽

Similarity Index ◽

Structural Similarity ◽

Diagnostic Image Quality ◽

Diagnostic Image ◽

Tissue Surfaces

Capsule endoscopy, which uses a wireless camera to take images of the digestive tract, is emerging as an alternative to traditional colonoscopy. The diagnostic values of these images depend on the quality of revealed underlying tissue surfaces. In this paper, we consider the problem of enhancing the visibility of detail and shadowed tissue surfaces for capsule endoscopy images. Using concentric circles at each pixel for random walks combined with stochastic sampling, the proposed method enhances the details of vessel and tissue surfaces. The framework decomposes the image into two detail layers that contain shadowed tissue surfaces and detail features. The target pixel value is recalculated for the smooth layer using similarity of the target pixel to neighboring pixels by weighting against the total gradient variation and intensity differences. In order to evaluate the diagnostic image quality of the proposed method, we used clinical subjective evaluation with a rank order on selected KID image database and compared to state of the art enhancement methods. The result showed that the proposed method provides a better result in terms of diagnostic image quality and objective quality contrast metrics and structural similarity index.

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