Automated renal cortical volume measurement for assessment of renal function in patients undergoing radical nephrectomy

Shimoyama, Hirofumi; Isotani, Shuji; China, Toshiyuki; Nagata, Masayoshi; Yokota, Isao; Kitamura, Kosuke; Wakumoto, Yoshiaki; Ide, Hisamitsu; Muto, Satoru; Tujimura, Akira; Yamaguchi, Raizo; Horie, Shigeo

doi:10.1007/s10157-017-1404-y

Cited by 14 publications

(5 citation statements)

References 18 publications

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“…These characteristics may render it impractical for use in a busy daily practice outside of investigational applications, and inaccessible in many resource-limited environments. The precision of the method used for renal volume assessment in this article has been evaluated by applying the equation developed by Isotani et al 15 and Shimoyama et al 10 These authors developed an equation to predict postoperative renal function after nephrectomy by renal volume change and they found a correlation between predicted and observed eGFR of 0.83. Applying this equation, our correlation between predicted and observed eGFR was 0.844, a result comparable with the already published literature.…”

Section: Discussionmentioning

confidence: 99%

“…The robustness of this method has been published in a previous study. 9 Predicted postoperative eGFR was calculated by renal volume change using the equation developed by Shimoyama et al 10 : predicted postoperative eGFR = preoperative eGFR × (postoperative renal volume/preoperative renal volume) . The correlation between the predicted and the observed postoperative eGFR has been quantified.…”

Section: Methodsmentioning

confidence: 99%

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Accuracy of implementing principles of fusion imaging in the follow up and surveillance of complex aneurysm repair

et al. 2018

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Fusion imaging is standard for the endovascular treatment of complex aortic aneurysms, but its role in follow up has not been explored. A critical issue is renal function deterioration over time. Renal volume has been used as a marker of renal impairment; however, it is not reproducible and remains a complex and resource-intensive procedure. The aim of this study is to determine the accuracy of a fusion-based software to automatically calculate the renal volume changes during follow up. In this study, computerized tomography (CT) scans of 16 patients who underwent complex aortic endovascular repair were analysed. Preoperative, 1-month and 1-year follow-up CT scans have been analysed using a conventional approach of semi-automatic segmentation, and a second approach with automatic segmentation. For each kidney and at each time point the percentage of change in renal volume was calculated using both techniques. After review, volume assessment was feasible for all CT scans. For the left kidney, the intraclass correlation coefficient (ICC) was 0.794 and 0.877 at 1 month and 1 year, respectively. For the right side, the ICC was 0.817 at 1 month and 0.966 at 1 year. The automated technique reliably detected a decrease in renal volume for the eight patients with occluded renal arteries during follow up. This is the first report of a fusion-based algorithm to detect changes in renal volume during postoperative surveillance using an automated process. Using this technique, the standardized assessment of renal volume could be implemented with greater ease and reproducibility and serve as a warning of potential renal impairment.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Accuracy of implementing principles of fusion imaging in the follow up and surveillance of complex aneurysm repair

et al. 2018

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“…Renal function was determined jointly by the left and right single kidneys. Single renal function measurement is an important component of the preoperative evaluation in many clinical contexts [21,22]. The absolute single renal function includes absolute and relative single renal function [23].…”

Section: Renal Depth Difference Of Single Renal Gfrmentioning

confidence: 99%

Study on the Rotation Method for Correcting the Depth of the Kidney to Optimize Renal Dynamic Imaging

Wei

Han

et al. 2022

Preprint

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Purpose: We aimed to investigate the effect and significance of the rotation method corrected for the depth of two kidneys on the determination of glomerular filtration rate (GFR) in total and single kidneys by the renal dynamic imaging Gates method. Methods: Seventy-two patients who underwent dynamic renal imaging by the rotation method and abdominal CT in our hospital were collected in the present study. CT scanning, rotation method, Tonnesen's formula, and Li-Qian's formula were compared in terms of the depth of two kidneys, depth difference between the two kidneys, and the total renal and single GFR obtained by substituting the renal depth values into Gates' formula. Results: ①GFR and the depth of kidneys: Compared to CT, Tonnesen's formula significantly underestimated the total and single renal GFR and the depth of both kidneys (P < 0.05). No significant differences were found in the total and single renal GFR and the depth of both kidneys between Li-Qian's formula and the rotation method (P > 0.05), with a strong agreement and with the least bias in the values measured by the rotation method. ②Renal depth difference: Compared to CT, Tonnesen's formula and Li-Qian's formula underestimated the difference in depth between the two kidneys (P < 0.05). None of the differences were statistically significant based on the rotation method (P > 0.05). The depth difference was positively correlated with the resulting changes in single renal function (|R(CT)-R(Li-Qian)|) and (|R(rotation)-R(Li-Qian)|) (r = 0.881, 0.641, P < 0.001). As the depth difference increased, Li Qian's formula could not visualize changes in single renal function accurately. In contrast, the accuracy of the rotation method in assessing single renal function remains unaffected. Conclusion: The rotation method obtains an accurate depth and depth difference between the two kidneys without additional CT radiation, enhancing the accuracy of the Gates method for determining total and single renal GFR. Trial registration: Medical Ethics Committee of First Hospital of Shanxi Medical University, 2021BAL0146. Registered 12 January 2021.

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“…All CT scans were conducted according to a multiphasic protocol including an initial non-contrast-enhanced phase followed by an arterial and/or parenchymal contrast-enhanced phase after intravenous injection of an iodinated contrast medium. All images were transferred to a workstation running personal computer-based software (SYNAPSE 3D, Fujifilm Corporation, Tokyo, Japan) already used in previous studies concerning renal volume calculation [15][16][17] . Using enhanced CT phases, the aforementioned software first performed an automatic extraction of the volume of both kidneys then adjusted by the operator using different correction tools to obtain the definitive renal volume.…”

Section: Populationmentioning

confidence: 99%

Renal function after partial nephrectomy following intra-arterial embolization of renal tumors

Bréhier

Bouvier

Besnier

et al. 2020

Sci Rep

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Laparoscopic Partial Nephrectomy (LPN) after intra-arterial Embolization of renal tumors (LPNE) in a hybrid operating room allows renal tumor enucleation without dissection and clamping of the renal pedicle. The purpose was to assess the potential negative impact of embolization on the renal function. This prospective monocentric study included all patients treated with LPNE between May 2015 and June 2019. Clinical data was collected and incorporated into the UroCCR database (NCT03293563). Glomerular Filtration Rate (GFR) and Computed Tomography Renal Volume (CTRV) were compared before and after 6 months following LPNE. The mean post-operative GFR was 86.6 mL/min (SD 22.9). The mean GFR loss was 9.4% (SD 15.1) and the median renal parenchyma loss was 21 mL (SD 20.6). Using a threshold of 25% GFR loss, age was the only significant predictive factor of renal function impairment according to bivariate (59.5 vs 69.3 years, p = 0.017) and multivariable analysis (OR 1.075, CI 1–1.2], p = 0.05). Significant renal function impairment was not correlated with the renal parenchymal volume loss (OR 0.987, CI [0.95–1.02], p = 0.435). Renal function impairment after LPNE seems to be comparable to other techniques of partial nephrectomy.

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Automated renal cortical volume measurement for assessment of renal function in patients undergoing radical nephrectomy

Abstract: The computational automated RCV measurements is a simple estimation of renal functional outcome for patients undergoing radical nephrectomy.

Cited by 14 publications

References 18 publications

Accuracy of implementing principles of fusion imaging in the follow up and surveillance of complex aneurysm repair

Accuracy of implementing principles of fusion imaging in the follow up and surveillance of complex aneurysm repair

Study on the Rotation Method for Correcting the Depth of the Kidney to Optimize Renal Dynamic Imaging

Renal function after partial nephrectomy following intra-arterial embolization of renal tumors

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