scholarly journals Microscope-Integrated OCT-Guided Volumetric Measurements of Subretinal Blebs Created by a Suprachoroidal Approach

2021 ◽  
Vol 10 (7) ◽  
pp. 24
Author(s):  
Ananth Sastry ◽  
Jianwei D. Li ◽  
William Raynor ◽  
Christian Viehland ◽  
Zhenxi Song ◽  
...  
Keyword(s):  
Volumetric Measurements

Digital volumetric measurements based on 3D scans of the lower limb: A valid and reproducible method for evaluation in lymphedema therapy. (Preprint)

2019 ◽  
Author(s):  
Daniel Schiltz ◽  
Natalie Kiermeier ◽  
Dominik Eibl ◽  
Christoph Koch ◽  
Karolina Müller ◽  
...  
Keyword(s):  
Lower Limb ◽  
Lower Leg ◽  
T Test ◽  
Volume Changes ◽  
Quick Method ◽  
Reproducible Method ◽  
The Mean ◽  
3D Scans ◽  
Paired T Test ◽  
Volumetric Measurements

BACKGROUND Exact quantification of volumetric changes of the extremities is difficult. There are several direct and indirect methods to assess extremity volume. As water displacement volumetry is rarely viable in a clinical setting and circumference measurements are prone to errors due to poor reproducibility and high inter- and intra-observer variability, an objective and easily reproducible method is indispensable. OBJECTIVE The aim of this study was to establish a standardized method based on 3D scans with defined caudal and cranial landmarks of the lower leg which allows for measurements of exactly the same body area. Furthermore, this study tests the method in terms of reproducibility and evaluates volume changes after surgical therapy in patients suffering from lymphedema. METHODS 3D-scans of the lower limb were performed with a mobile 3D-scanner. Volumetric calculation was done digitally. “Repeatability“ and “Inter-observer reliability” of digital volumetry were tested. Furthermore, the method was applied on 31 patients suffering from chronic lymphedema. ANOVA (analyses of variance) was conducted to compare the digital volumetric measurements. To assess the sensitivity to changes in digital volumetry, the mean volume of 31 patients before and 3 months after therapy were compared by a paired t-Test. RESULTS Calculations of repeatability of the volume based on 20 3D-scans of the same lower leg showed a mean volume of 2,488 ± 0,011 liters (range: 2,470 – 2,510). The mean volume of the 7 measurements of the 3 examiners did not differ significantly (F(2,18) = 1,579, p = .233). The paired t-Test showed a significant mean volume decrease of 375ml (95% CI = 245/505ml) between pre and post treatment (t (30) =5,892, p < .001). CONCLUSIONS 3D-Volumetry is a noninvasive, easy and quick method to assess volume changes of the lower leg. Other than the costs, it is reproducible and precise and therefore ideal for evolution of therapy in lymphedema.

scholarly journals Reproducibility and reliability of volumetric measurements of olfactory eloquent structures

1997 ◽  
Vol 4 (4) ◽  
pp. 264-269 ◽  
Author(s):  
David M. Yousem ◽  
Rena J. Geckle ◽  
Richard L. Doty ◽  
Warren B. Bilker
Keyword(s):  
Volumetric Measurements

The method of volumetric measurements under high pressure I. Qualitative approach

1994 ◽  
Vol 12 (4-6) ◽  
pp. 297-300 ◽  
Author(s):  
A. G. Umnov ◽  
V. V. Brazhkin ◽  
R. N. Voloshin ◽  
S. V. Popova
Keyword(s):  
High Pressure ◽  
Qualitative Approach ◽  
Volumetric Measurements

scholarly journals Relation between planimetric and volumetric measurements of permafrost coast erosion: a case study from Herschel Island, western Canadian Arctic

2016 ◽  
Vol 35 (1) ◽  
pp. 30313 ◽  
Author(s):  
Jaroslav Obu ◽  
Hugues Lantuit ◽  
Michael Fritz ◽  
Wayne H. Pollard ◽  
Torsten Sachs ◽  
...  
Keyword(s):  
Canadian Arctic ◽  
Volumetric Measurements

Volumetric analysis of subarachnoid hemorrhage: assessment of the reliability of two computerized methods and their comparison with other radiographic scales

2013 ◽  
Vol 118 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Luis Jiménez-Roldán ◽  
Jose F. Alén ◽  
Pedro A. Gómez ◽  
Ramiro D. Lobato ◽  
Ana Ramos ◽  
...  
Keyword(s):  
Subarachnoid Hemorrhage ◽  
Quantitative Methods ◽  
Interobserver Reliability ◽  
Characteristic Curve ◽  
Intraclass Correlation ◽  
Delayed Cerebral Ischemia ◽  
Interobserver Reproducibility ◽  
Poor Outcome ◽  
Bleeding Volume ◽  
Volumetric Measurements

Object There were two main purposes to this study: first, to assess the feasibility and reliability of 2 quantitative methods to assess bleeding volume in patients who suffered spontaneous subarachnoid hemorrhage (SAH), and second, to compare these methods to other qualitative and semiquantitative scales in terms of reliability and accuracy in predicting delayed cerebral ischemia (DCI) and outcome. Methods A prospective series of 150 patients consecutively admitted to the Hospital 12 de Octubre over a 4-year period were included in the study. All of these patients had a diagnosis of SAH, and diagnostic CT was able to be performed in the first 24 hours after the onset of the symptoms. All CT scans were evaluated by 2 independent observers in a blinded fashion, using 2 different quantitative methods to estimate the aneurysmal bleeding volume: region of interest (ROI) volume and the Cavalieri method. The images were also graded using the Fisher scale, modified Fisher scale, Claasen scale, and the semiquantitative Hijdra scale. Weighted κ coefficients were calculated for assessing the interobserver reliability of qualitative scales and the Hijdra scores. For assessing the intermethod and interrater reliability of volumetric measurements, intraclass correlation coefficients (ICCs) were used as well as the methodology proposed by Bland and Altman. Finally, weighted κ coefficients were calculated for the different quartiles of the volumetric measurements to make comparison with qualitative scales easier. Patients surviving more than 48 hours were included in the analysis of DCI predisposing factors and analyzed using the chi-square or the Mann-Whitney U-tests. Logistic regression analysis was used for predicting DCI and outcome in the different quartiles of bleeding volume to obtain adjusted ORs. The diagnostic accuracy of each scale was obtained by calculating the area under the receiver operating characteristic curve (AUC). Results Qualitative scores showed a moderate interobserver reproducibility (weighted κ indexes were always < 0.65), whereas the semiquantitative and quantitative scores had a very strong interobserver reproducibility. Reliability was very high for all quantitative measures as expressed by the ICCs for intermethod and interobserver agreement. Poor outcome and DCI occurred in 49% and 31% of patients, respectively. Larger bleeding volumes were related to a poorer outcome and a higher risk of developing DCI, and the proportion of patients suffering DCI or a poor outcome increased with each quartile, maintaining this relationship after adjusting for the main clinical factors related to outcome. Quantitative analysis of total bleeding volume achieved the highest AUC, and had a greater discriminative ability than the qualitative scales for predicting the development of DCI and outcome. Conclusions The use of quantitative measures may reduce interobserver variability in comparison with categorical scales. These measures are feasible using dedicated software and show a better prognostic capability in relation to outcome and DCI than conventional categorical scales.

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