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Bangladesh's government had been constantly conscious of its health-care system. As a result, the health-care system had seen a significant rise in quality in the past few years. The Lean Six Sigma concept is used to boost up the productivity as well as the quality of products or services. The purpose of this article was to measure the process capability in the health-care system by lean tools. In this study, we selected the dialysis unit as our investigation area where we applied the Six Sigma DMAIC (Define, Measure, Analysis, Improve, and Control) model which had been structured step by step, respectively. Furthermore, different tools of Total Quality Management, Statistical Quality Control and Lean manufacturing like SIPOC (Supplier, Input, Process, Output, and Customer) diagram, P Control chart, Fishbone diagram, and Pareto analysis had been performed in different phases of the DMAIC model. Y27632 Measuring process capability using the DMAIC model helped to identify the problems associated with the dialysis unit and also recommendations were developed based on investigation and analysis. These recommendations will help the hospital management to overcome all problems and increase service rate and patient safety in the dialysis unit.
The purpose of this study was to investigate the effect of device and scan size on quantitative optical coherence tomography angiography (OCT-A) metrics.
The 3 × 3 mm scans from Optovue AngioVue and Zeiss AngioPlex systems were included for 18 eyes of 18 subjects without ocular pathology. The foveal avascular zone (FAZ) was segmented manually by two observers, from which estimates of FAZ area (using both the nominal image scale and the axial length corrected image scale) and acircularity were derived. Three scan sizes (3 mm, 6 mm HD, and 8 mm) from the AngioVue system were included for 15 eyes of 15 subjects without ocular pathology. For each subject, larger image sizes were resized to the same resolution as 3 × 3 mm scans, aligned, then cropped to a common area. FAZ area, FAZ acircularity, average and total parafoveal intercapillary area, vessel density, and vessel end points were computed.
Between the devices used here, there were no significant differences in FAZ acircularity (
= 0.88) or FAZ area using scaled (
= 0.11) or unscaled images (
= 0.069). Although there was no significant difference in FAZ area across scan sizes (
= 0.30), vessel morphometry metrics were all significantly influenced by scan size.
The scan devices and sizes used here do not affect FAZ area measures derived from manual segmentations. In contrast, vessel morphometry metrics are affected by scan size. As individual differences in axial length induce differences in absolute scan size, extreme care should be taken when interpreting metrics of vessel morphometry, both between and within OCT-A devices.
A better characterization of the confounds surrounding OCT-A retinal vasculature metrics can lead to improved application of these metrics as biomarkers for retinal and systemic diseases.
A better characterization of the confounds surrounding OCT-A retinal vasculature metrics can lead to improved application of these metrics as biomarkers for retinal and systemic diseases.
The purpose of this study is to compare the ability of 3 optical coherence tomography angiography (OCTA) devices to measure lesion area in patients with macular neovascularization (MNV) with type 1, 2 and mixed neovascularization (NV).
OCTA, fluorescein angiography (FA), indocyanine green angiography (ICGA), and structural optical coherence tomography (OCT) were performed. NV lesion area measurements were performed by two graders.
Twenty-eight eyes were included 20 with NV were classified as type 1, 6 as type 2, and 2 as mixed type. AngioVue and Spectralis detected the NV in 26 out of 28 eyes (92.8%). The intraclass correlation coefficient (ICC) between readers for the three different OCTA with the different slabs was high. The NV area was larger in the outer retina to choriocapillaris (ORCC) and choriocapillaris (CC) images for the AngioVue device and the PLEX Elite device compared to avascular images (
< 0.05). The mean values of the NV area were not significantly different among the three instruments (Friedman test,
> 0.05) for the avascular zone (AV), ORCC, and CC images. Median (interquartile range [IQR]) NV were significantly different among avascular images, ORCC images, and CC images of the AngioVue device (
= 0.046), of the Spectralis device (
= 0.015), and the PLEX Elite device (
< 0.001).
The ORCC slabs showed the highest detection rate for NV detection independently to the device used, and swept source (SS)-OCTA measurements of ORCC slabs showed the highest detection rate of NVs compared to the spectral domain (SD)-OCTA.
It is pivotal to realize how much we can rely on OCTA to make a diagnosis of NV.
It is pivotal to realize how much we can rely on OCTA to make a diagnosis of NV.
To explore the agreement between the wavefront supported custom ablation (WASCA) aberrometer and manifest refraction (MR) and cycloplegic refraction (CR) in hyperopia testing.
Ninety eyes of 90 hyperopic patients (spherical equivalent ≥ +0.5 D) were evaluated; MR, CR, and WASCA refraction (WR) were performed consecutively. Analysis pupil size was 6.0 mm in WASCA measurement using the Seidel method. The conventional notation was transferred into vector components for analysis, i.e., spherical equivalent (M) and two cross-cylinders at axis 0° (J
) and axis 45° (J
). Bland-Altman plots were used to test the agreement between the two measurements.
The mean Ms obtained with MR and CR were 3.23 ± 1.74 D and 4.04 ± 2.04 D, respectively (
< 0.001), and the correlation was high (r = 0.90,
< 0.001). The WR was highly correlated with MR and CR in terms of M (r = 0.89, 0.87), but not significantly correlated in J
and J
. The total dioptric power vector error was 0.18 ± 1.00 D between WR and MR and -0.64 ± 1.03 D between WR and CR. The limits of agreement of all vector components were beyond ± 1.0 D. With hyperopia level increase, WR tended to overestimate MR (
= 0.04), whereas WR always underestimated CR.
WASCA could act as a reference of subjective refraction in hyperopia measurement, the exchangeability is not fully applicable.
WASCA can provide an alternative for objective refraction in hyperopia measurement.
WASCA can provide an alternative for objective refraction in hyperopia measurement.
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