Factors Affecting Contrast-Detail Performance in Computed Tomography: A Review

Alsleem, Haney; Davidson, Rob

doi:10.1016/j.jmir.2012.12.001

Cited by 25 publications

(28 citation statements)

References 54 publications

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“…This effect was supported by previous study, which proved that image noise was inversely correlated with tube current [10]. Alsleem and Davidson stated that decrease in mA value will increase the image noise and lower kV, as a result of reduced total energy ux that will decrease image noise, leading to better image contrast enhancement [11]. Study by Raman et al stated that improvement of image quality with low image noise was due to the use of high tube current [12].…”

Section: Discussionsupporting

confidence: 52%

Effect of different contrast administration protocols on contrast enhancement and image quality in CT scan

Ibrahim

Karim

Shuaib

et al. 2019

Preprint

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Objective The aim of this study is to compare the effect of different contrast administration protocols practiced in Advanced Medical and Dental Institute, Universiti Sains Malaysia (Group A) and Hospital Pulau Pinang, Malaysia (Group B), on contrast enhancement and image quality in computed tomography scan. The two protocols were fixed time delay (FTD) with fixed volume (FV), and automatic bolus tracking (ABT) with weight based volume (WBV) contrast administration. Quantification of contrast enhancement’s magnitude in four different anatomical structures was measured in Hounsfield Unit (HU) and based on 5-point scale (1=poor, 5=excellent), the images were rated qualitatively.Results Mean enhancement values of all structures in Group B was higher compared to Group A (p = < 0.001). Mean of quality rating between the two groups was statistically not significant (p = 0.185). There was a weak correlation between HU values and administered contrast volume (r = 0.152). It can be concluded that FTD with FV protocol is non inferior to ABT with WBV protocol as it yielded higher degree of contrast enhancement. There was no significant difference between the two protocols in term of qualitative assessment although ABT with WBV protocol had higher mean grading in image quality.

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Section: Discussionsupporting

confidence: 52%

Effect of different contrast administration protocols on contrast enhancement and image quality in CT scan

Ibrahim

Karim

Shuaib

et al. 2019

Preprint

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“…The accurate reconstruction process of geometry is depend on type of CT scanner [ 16 , 17 ], method of segmentation [ 19 , 20 ], software algorithm [ 12 , 21 ] and manufacturing technology [ 12 , 13 ]. Currently, scientists are working on precisely determining the deviation and distribution associated with a change in slice thickness for reconstruction of geometry [ 21 , 27 ] but none actually presents methods to improve the spatial resolution of this data at the stage of data processing.…”

Section: Discussionmentioning

confidence: 99%

“…The spatial resolution defines the ability to resolve, as separate forms, small objects that are very close together (like in the area of the temporomandibular joint). Most datasets in medical imaging are anisotropic, and in many cases, the slice thickness is several times larger than the pixel distance [ 3 , 16 ]. Changing the slice thickness can create an artifact–partial-volume effect.…”

Section: Discussionmentioning

confidence: 99%

“…Each stage of the medical method has an impact on the accuracy of a model’s geometry reconstruction. The data acquisition stage is the most important one since the appropriate selection of the system and measurement parameters influence the quality of the obtained diagnostic data [ 16 , 17 ]. The stage of data processing comes next and usually begins with digital filtering to remove measurement noise appearing in the 2D images.…”

Section: Introductionmentioning

confidence: 99%

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Improved accuracy of mandible geometry reconstruction at the stage of data processing and modeling

Budzik

Turek

2018

Australas Phys Eng Sci Med

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The article presents a comparative study of influence of the Lanczos resampling filter on improving the accuracy of reconstruction of mandible geometries. The research was performed on eight different patients. Digital Imaging and Communications in Medicine data were obtained on the Siemens Somatom Sensation Open 40 scanner. At the stage of reconstruction, the same parameters were utilized, while only slice thickness was changed. Modeling with voxel dimensions of 0.4 mm × 0.4 mm × 1.5 mm was chosen as the gold standard over the modeling approach comprising voxel dimensions of 0.4 mm × 0.4 mm × 3.0 mm and improved using the Lanczos resampling filter. The influence of the Lanczos resampling filter on the accuracy of reconstruction of mandible geometry is very similar for the eight presented patients. The average results show a distribution with a positive skew and kurtosis. The value of skewness is 0.713 and kurtosis is 4.221 for the model without Lanczos filtering applied. When the Lanczos filtering is applied the value of skewness is 0.542 and kurtosis is 4.313. Based on 95% confidence, changes in layer thickness from 1.5 mm to 3 mm generated errors reconstructing the geometry of the mandible at the value of 0.153 mm ± 1.209 mm. In models improved using the Lanczos resampling filter, the errors generated in reconstructing the geometry of the mandible were minimized at the value of 0.160 mm ± 1.007 mm. The presented research highlights new opportunities to improve the accuracy of reconstruction geometry of the mandible at the stage of data processing.

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“…Scientists also present work about a comparative evaluation of CBCT and MDCT at the stage of image reconstruction [13] and [14] and accuracy reconstruction 3D model [15]. The reconstruction process is also dependent on spatial and contrast resolution of computer tomography systems [16] and [17] method of segmentation [18] software algorithms [19] and [20], and a manufacturing technology [7] and [21].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Accuracy of Reconstructed Two Teeth Models Manufactured Using the 3DP and FDM Technologies

Budzik

Burek

Bazan

et al. 2016

SV-JME

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Traditional computer modelling is performed using CAD systems. Everything starts with a constructor idea. They present their concept on a technical drawing and then perform it in a virtual environment of a 3D model. This model may then be manufactured with the use of available methods. The problem arises when technical documentation of an object, for example, a tooth model, is not available.2D images are the traditional way of presenting anatomical structures; unfortunately, this method is sometimes ineffective. In advanced cases of dental conditions, there are difficulties in the recognition and proper interpretation of 2D images of the affected area. This is why other ways to show the shape of the complex internal structures have been researched, such as the (3DP and FDM). They were similarly aligned in the work space of both printers to maintain similar conditions of printing, and similar layer thicknesses of 0.1 mm and 0.13 mm were used. The printed models were scanned using a focus variation (FV) microscope. The scanned geometry of the models of the two teeth was compared with the geometry of the teeth after their segmentation and filtering. A fitting process was carried out using the best fit algorithm with a fitting condition of 0.001 mm. The achieved accuracy of the FV measurements was significantly higher than the accuracy of the used printing methods. FV can be applied to performing 3D scans of complex shapes such as the crown and roots of a tooth. 3DP models have more homogenous structure, whereas layer structure is easy to recognize for FDM models. Due to that, the 3DP models have to be strengthened using infiltration, which makes it more difficult to predict the final dimensions and to achieve required accuracy. Keywords: dental model, reverse engineering, rapid prototyping, focus variation Highlights • The accuracy of FDM and 3DP techniques were examined in terms of manufacturing dental models such as tooth models.• The infiltration applied to the 3DP models reduced in accuracy compared to FDM models.• For the FDM models, the values of mean deviation were negative and met the accuracy specified by the printer's manufacturer.• Due to infiltration the values of mean deviation of 3DF models were positive.• The infiltration also caused the models manufactured with the FDM to be more accurate than the 3DP ones.• It was determined that the focus variation method can be applied to measure parts with a complex shape, such as the crown and roots of a tooth.

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Factors Affecting Contrast-Detail Performance in Computed Tomography: A Review

Cited by 25 publications

References 54 publications

Effect of different contrast administration protocols on contrast enhancement and image quality in CT scan

Effect of different contrast administration protocols on contrast enhancement and image quality in CT scan

Improved accuracy of mandible geometry reconstruction at the stage of data processing and modeling

Analysis of the Accuracy of Reconstructed Two Teeth Models Manufactured Using the 3DP and FDM Technologies

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