Automated image quality assessment for chest <scp>CT</scp> scans

Reeves, Anthony P.; Xie, Yiting; Liu, Shuang

doi:10.1002/mp.12729

Cited by 4 publications

(5 citation statements)

References 28 publications

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“…We believe that our low-dose simulation is sufficient because the measured standard deviation of the trachea mask

is similar to results taken from low-dose scans from Reeves et al. 45 and Sui et al. 47 …”

Section: Discussionsupporting

confidence: 75%

“…Whilst there has been limited validation of the appearance of lung nodules against simulated low dose simulation, 44 there has been no validation on the efficacy of these methods on the appearance of airways. We believe that our low dose simulation is sufficient because the measured standard deviation of the trachea mask T n is similar to results taken from low dose scans from Reeves et al 61 and Sui et al 68 Similarly, with voxel size simulation, ideally one would reconstruct the images from the original sinogram, for example in Achenbach et al 1 However, as the sinograms were unavailable, we simulated the voxel size through interpolation of the original CT images similar to Robins et al 62 We believe the simulation is sufficient as it shows the robustness and precision of the centreline, recentring and cross-sectional plane algorithms in the pipeline. Changes in voxel sizes will change the combinatorics or arrangement of the binary image.…”

Section: Limitationssupporting

confidence: 77%

“…To relate

to the physical dose from a CT scanner, we adopted the method described by Reeves et al. 45 This paper quantified the dose of an image with a homogeneous region in the chest CT scan. To this end, we used the homogeneous region inside the trachea.…”

Section: Discussionmentioning

confidence: 99%

“…Using results from Reeves et al. 45 and Sui et al., 47 a low-dose scan with a tube current-time product 25 mAs has maximum

of 55 HU. Thus we assume

approximately corresponds to a low-dose scan.…”

Section: Discussionmentioning

confidence: 99%

“…Table 2, shows values of T n on a selection of images against a range of λ. Using results from Reeves et al 61 and Sui et al, 68 a low dose scan with a tube current-time product 25mAs has maximum T n of 55HU. Thus, we assume λ = 3.5 approximately corresponds to a low dose scan.…”

Section: Dosementioning

confidence: 99%

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Reproducibility of an airway tapering measurement in computed tomography with application to bronchiectasis

et al. 2019

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Purpose: This paper proposes a pipeline to acquire a scalar tapering measurement from the carina to the most distal point of an individual airway visible on CT. We show the applicability of using tapering measurements on clinically acquired data by quantifying the reproducibility of the tapering measure. Methods: We generate a spline from the centreline of an airway to measure the area and arclength at contiguous intervals. The tapering measurement is the gradient of the linear regression between area in log space and arclength. The reproducibility of the measure was assessed by analysing different radiation doses, voxel sizes and reconstruction kernel on single timepoint and longitudinal CT scans and by evaluating the effct of airway bifurcations. Results: Using 74 airways from 10 CT scans, we show a statistical difference, p = 3.4 × 10 −4 in tapering between healthy airways (n = 35) and those affected by bronchiectasis (n = 39). The difference between the mean of the two populations was 0.011mm −1 and the difference between the medians of the two populations was 0.006mm −1 . The tapering measurement retained a 95% confidence interval of ±0.005mm −1 in a simulated 25 mAs scan and retained a 95% confidence of ±0.005mm −1 on simulated CTs up to 1.5 times the original voxel size. Conclusion: We have established an estimate of the precision of the tapering measurement and estimated the effect on precision of simulated voxel size and CT scan dose. We recommend that the scanner calibration be undertaken with the phantoms as described, on the specific CT scanner, radiation dose and reconstruction algorithm that is to be used in any quantitative studies.Our code is available at https://github.com/quan14/AirwayTaperingInCT

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“…We believe that our low-dose simulation is sufficient because the measured standard deviation of the trachea mask

is similar to results taken from low-dose scans from Reeves et al. 45 and Sui et al. 47 …”

Section: Discussionsupporting

confidence: 75%

Section: Limitationssupporting

confidence: 77%

“…To relate

Section: Discussionmentioning

confidence: 99%

“…Using results from Reeves et al. 45 and Sui et al., 47 a low-dose scan with a tube current-time product 25 mAs has maximum

of 55 HU. Thus we assume

approximately corresponds to a low-dose scan.…”

Section: Discussionmentioning

confidence: 99%

Section: Dosementioning

confidence: 99%

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Reproducibility of an airway tapering measurement in computed tomography with application to bronchiectasis

et al. 2019

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Validation of the tail replacement method in MTF calculations using the homogeneous and non-homogeneous edges of a phantom

Anam

Budi

Haryanto

et al. 2019

J. Phys.: Conf. Ser.

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We validated the tail replacement technique in the modulation transfer function (MTF) calculation of CT images using edges of homogeneous and non-homogeneous phantom using an automated method. The algorithm for the automated MTF calculation consists of several steps. The upper edge of the phantom was detected from its axial image and pixel values was taken to create an edge spread function (ESF). The left tail of the ESF was flipped horizontally to replace the right tail. Differentiating the ESF produced a line spread function (LSF) which was Fourier transformed to produce the MTF. To validate the result for the non-homogeneous phantom was compared with that for a homogeneous phantom. Results showed that in the homogeneous module, the MTF curve generated without tail replacement corresponded to its shape in use. However for the non-homogeneous module, the MTF obtained without tail replacement differed considerably from its shape in use. The 50% value of MTF (MTF-50) without tail replacement was 0.44 cycles/mm compared to 0.33 cycles/mm in use. Using the tail replacement, the MTFs in the homogeneous and non-homogeneous modules were comparable, with MTF-50 values of 0.33 cycles/mm for both. In summary, the MTF cannot be conventionally measured from the edge of the non-homogeneous module, but it can be resolved using the tail replacement technique on the ESF curve.

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Local quality assessment of patient specific synthetic-CT via voxel-wise analysis

Chourak

Barateau

Nunes

et al. 2022

2022 International Conference on Digital Image Computing: Techniques and Applications (DICTA)

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Automated image quality assessment for chest CT scans

Abstract: Automated image quality assessment may be useful for quality control for lung cancer screening and may enable performance improvements to automated computer analysis methods.

Cited by 4 publications

References 28 publications

Reproducibility of an airway tapering measurement in computed tomography with application to bronchiectasis

Reproducibility of an airway tapering measurement in computed tomography with application to bronchiectasis

Validation of the tail replacement method in MTF calculations using the homogeneous and non-homogeneous edges of a phantom

Local quality assessment of patient specific synthetic-CT via voxel-wise analysis

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