New Formula for Quantification of Pleural Effusions From Computed Tomography

Mergo, Patricia J.; Helmberger, Thomas; Didovic, John; Cernigliaro, Joseph G.; Ros, Pablo R.; Staab, Edward V.

doi:10.1097/00005382-199904000-00011

Cited by 70 publications

(53 citation statements)

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“…Our results concur with the findings of previous studies regarding the degree of correlation between pleural effusion and estimated pleural effusion on CT [4,5]. This observation is important: our approach is comparable to the approach of ultrasonography and chest radiography where practicality is also often more important than accuracy [6][7][8][9].…”

Section: Discussionsupporting

confidence: 91%

“…Emergency radiologists are regularly asked to quantify the volume of such pleural fluid collections on CT. The size of an effusion can significantly impact patient management, especially in critically ill patients [4,5]. Simple rules of thumb to estimate pleural fluid volume on thoracic sonography and chest radiographs have been proposed in the literature [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Quantification of pleural effusion from single area measurements on CT

et al. 2013

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The objective of this study was to determine if area measurements of pleural fluid on computed tomography (CT) reflect the actual pleural fluid volume (PEvol) as measured at autopsy, to establish a formula to estimate the volume of pleural effusion (PEest), and to test the accuracy and observer reliability of PEest.132 human cadavers, with pleural effusion were divided into phase 1 (n=32) and phase 2 (n=100). In phase 1, PEvol was compared to area measurements on axial (axA), sagittal (sagA), and coronal (corA) CT images. Linear regression analysis was used to create a formula to calculate PEest. In phase 2, intra-class correlation (ICC) was used to assess inter-reader reliability and determine the agreement between PEest and PEvol. PEvol correlated to a higher degree to axA (r s mean= 0.738; p<0.001) than to sagA (r s mean=0.679, p<0.001) and corA (r s mean = 0.709; p < 0.001). PEest can be established with the following formula: axA×0.1=PEest. Mean difference between PEest and PEvol was less than 40 mL (ICC=0.837-0.874; p<0.001). Inter-reader reliability was higher between two experienced readers (ICC=0.984-0.987; p<0.001) than between an inexperienced reader and both experienced readers (ICC =0.660-0.698; p<0.001). Pleural effusions may be quantified in a rapid, reliable, and reasonably accurate fashion using single area measurements on CT.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Quantification of pleural effusion from single area measurements on CT

et al. 2013

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“…According to our findings, the results based on this formula are inaccurate without using coefficients in cubic equation (Table 3). Mergo et al 8 described volume quantification based on a combination of planar measurements corresponding to our dimensions a and d and recommended the formula a×d×d for volume quantification. Based on our results, even when appropriate coefficients in quadratic equation were used, the results had the greatest average absolute variation of ±208.2 mL (Table 3).…”

Section: Discussionmentioning

confidence: 99%

“…It can be calculated by automatic quantification using special software 7 ; however, this is not widely available. Mergo et al 8 described the quantification of pleural effusion amount from CT, but their calculation requires measurements in three planes.…”

Section: Introductionmentioning

confidence: 99%

Quantification of pleural effusion on CT by simple measurement

Hazlinger¹,

Čtvrtlík²,

Langová³

et al. 2014

Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub

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Aims. To find the simplest method for quantifying pleural effusion volume from CT scans. Methods. Seventy pleural effusions found on chest CT examination in 50 consecutive adult patients with the presence of free pleural effusion were included. The volume of pleural effusion was calculated from a three-dimensional reconstruction of CT scans. Planar measurements were made on CT scans and their two-dimensional reconstructions in the sagittal plane and at three levels on transversal scans. Individual planar measurements were statistically compared with the detected volume of pleural effusion. Regression equations, averaged absolute difference between observed and predicted values and determination coefficients were found for all measurements and their combinations. A tabular expression of the best single planar measurement was created. Results. The most accurate correlation between the volume and a single planar measurement was found in the dimension measured perpendicular to the parietal pleura on transversal scan with the greatest depth of effusion. Conversion of this measurement to the appropriate volume is possible by regression equation: Volume = 0.365 × b 3 -4.529 × b 2 + 159.723 × b -88.377. Conclusion. We devised a simple method of conversion of a single planar measurement on CT scan to the volume of pleural effusion. The tabular expression of our equation can be easily and effectively used in routine practice.

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“…Mironov et al compared with three-dimensional CT reconstruction ( 14 ). The laterality of the pleural effusions was recorded as right, left, or bilateral.…”

Section: Genitourinary Imaging: Pleural Effusion In Patients With Stamentioning

confidence: 99%