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3d kidney stone

Manoj Mannil, Jochen von Spiczak, Thomas Hermanns, Cédric Poyet, Hatem Alkadhi, Christian Daniel Fankhauser
PURPOSE: To determine the predictive value of three-dimensional texture analysis (3D-TA) in computed tomography (CT) images for successful shock wave lithotripsy (SWL) in patients with kidney stones. MATERIAL AND METHODS: Patients with pre and postoperative CT scans, previously untreated kidney stones and a stone diameter of 5-20 mm were included. A total of 224 3D-TA features of each kidney stone, including the attenuation measured in Hounsfield Units (HU), and the clinical variables body mass index (BMI), initial stone size, and skin-to-stone distance (SSD) were analyzed using five commonly used machine learning models...
April 16, 2018: Journal of Urology
Lakshmi Ananthakrishnan, Xinhui Duan, Yin Xi, Matthew A Lewis, Margaret S Pearle, Jodi A Antonelli, Harold Goerne, Elysha M Kolitz, Suhny Abbara, Robert E Lenkinski, Julia R Fielding, John R Leyendecker
PURPOSE: To assess the non-inferiority of dual-layer spectral detector CT (SDCT) compared to dual-source dual-energy CT (dsDECT) in discriminating uric acid (UA) from non-UA stones. METHODS: Fifty-seven extracted urinary calculi were placed in a cylindrical phantom in a water bath and scanned on a SDCT scanner (IQon, Philips Healthcare) and second- and third-generation dsDECT scanners (Somatom Flash and Force, Siemens Healthcare) under matched scan parameters. For SDCT data, conventional images and virtual monoenergetic reconstructions were created...
April 7, 2018: Abdominal Radiology
Nils Große Hokamp, Johannes Salem, Albrecht Hesse, Jasmin Alexandra Holz, Manuel Ritter, Axel Heidenreich, David Maintz, Stefan Haneder
OBJECTIVES: The aim of this study was to investigate the feasibility of kidney stone composition analysis using spectral detector computed tomography scanner (SDCT) with normal- and low-dose imaging protocols. METHODS: A total of 154 stones harvested from nephrolithotripsy or nephrolithotomy with a known monocrystalline composition as determined by infrared spectroscopy were examined in a nonanthropomorphic phantom on an SDCT (IQon, Philips, Best, the Netherlands)...
March 28, 2018: Investigative Radiology
Andrew R Christiansen, Rami M Shorti, Cory D Smith, William C Prows, Jay T Bishoff
PURPOSE: Despite the increasing use of advanced 3D imaging techniques and 3D printing, these techniques have not yet been comprehensively compared in a surgical setting. The purpose of this study is to explore the effectiveness of five different advanced imaging modalities during a complex renal surgical procedure. METHODS: A patient with a horseshoe kidney and multiple large, symptomatic stones that had failed Extracorporeal Shock Wave Lithotripsy (ESWL) and ureteroscopy treatment was used for this evaluation...
March 15, 2018: World Journal of Urology
Ahmed Ghazi, Timothy Campbell, Rachel Melnyk, Changyong Feng, Alex Andrusco, Jonathan Stone, Erdal Erturk
INTRODUCTION AND OBJECTIVES: The restriction of resident hours with an increasing focus on patient safety and a reduced caseload has impacted surgical training. A complex and complication prone procedure such as percutaneous nephrolithotomy (PCNL) with a steep learning curve may create an unsafe environment for hands-on resident training. In this study, we validate a high fidelity, inanimate PCNL model within a full-immersion simulation environment. METHODS: Anatomically correct models of the human pelvicaliceal system, kidney, and relevant adjacent structures were created using polyvinyl alcohol hydrogels and three-dimensional-printed injection molds...
December 2017: Journal of Endourology
Luciano A Favorito
No abstract text is available yet for this article.
May 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
Hasan Anil Atalay, H Lütfi Canat, Volkan Ülker, İlter Alkan, Ünsal Özkuvanci, Fatih Altunrende
OBJECTIVE: To investigate the impact of personalized three dimensional (3D) printed pelvicalyceal system models on patient information before percutaneous nephrolithotripsy surgery. MATERIAL AND METHODS: Patients with unilateral complex renal stones with indicatation of percutaneous nephrolithotripsy surgery were selected. Usable data of patients were obtained from CT scans as Digital Imaging and Communications in Medicine (DICOM) format. Mimics software version 16...
May 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
Fabio C Vicentini, Luiz A A Botelho, José L M Braz, Ernane S Almeida, Marcelo Hisano
We describe the use of the Uro Dyna-CT, an imaging system used in the operating room that produces real-time three-dimensional (3D) imaging and cross-sectional image reconstructions similar to an intraoperative computerized tomography, during a percutaneous nephrolithotomy and a contralateral flexible ureteroscopy in a complete supine position. A 65 year-old female patient had an incomplete calyceal staghorn stone in the right kidney and a 10mm in the left one. The procedure was uneventful and the intraoperative use of the Uro Dyna-CT identified 2 residual stones that were not found by digital fluoroscopy and flexible nephroscopy at the end of surgery, helping us to render the patient stone-free in one procedure, which was confirmed by a postoperative CT scan...
July 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
Ju G Alyaev, N A Grigoriev, N I Sorokin, I V Diakonov, S H Ali
PURPOSE: to compare various methods of upper urinary tract drainage in patients with urolithiasis. PATIENTS AND METHODS: 60 patients were included into a prospective study which ran from March 2013 through December 2014. All patients underwent PCNL with a nephrostomy tract diameter of (28-30 Ch.) at the I.M. Sechenov First Moscow State Medical University urology clinic. Patients were divided into 2 groups. Group 1 30 (patients) underwent nephrostomy after PCNL with nephrostomy tract placement, in group 2 (29 patients) internal drainage was performed...
August 2016: Urologii︠a︡
Matej Knezevic, Ivana Paksi, Boris Ruzic, Tomislav Galeta
No abstract text is available yet for this article.
January 1, 2017: Surgical Innovation
Kevin G Wang
A novel multiphase fluid-solid-coupled computational framework is applied to investigate the interaction of a kidney stone immersed in liquid with a lithotripsy shock wave (LSW) and a gas bubble near the stone. The main objective is to elucidate the effects of a bubble in the shock path to the elastic and fracture behaviors of the stone. The computational framework couples a finite volume 2-phase computational fluid dynamics solver with a finite element computational solid dynamics solver. The surface of the stone is represented as a dynamic embedded boundary in the computational fluid dynamics solver...
November 24, 2016: International Journal for Numerical Methods in Biomedical Engineering
Wayne Brisbane, Michael R Bailey, Mathew D Sorensen
Kidney stone imaging is an important diagnostic tool and initial step in deciding which therapeutic options to use for the management of kidney stones. Guidelines provided by the American College of Radiology, American Urological Association, and European Association of Urology differ regarding the optimal initial imaging modality to use to evaluate patients with suspected obstructive nephrolithiasis. Noncontrast CT of the abdomen and pelvis consistently provides the most accurate diagnosis but also exposes patients to ionizing radiation...
November 2016: Nature Reviews. Urology
Hasan Anıl Atalay, Volkan Ülker, İlter Alkan, Halil Lütfi Canat, Ünsal Özkuvancı, Fatih Altunrende
OBJECTIVE: To investigate the impact of three-dimensional (3D) printed pelvicaliceal system models on residents' understanding of pelvicaliceal system anatomy before percutaneous nephrolithotripsy (PCNL). MATERIALS AND METHODS: Patients with unilateral complex renal stones indicating PCNL were selected. Usable data of patients were obtained from CT-scans in Digital Imaging and Communications in Medicine (DICOM) format. Mimics software version 16.0 (Materialise, Belgium) was used for segmentation and extraction of pelvicaliceal systems (PCSs)...
October 2016: Journal of Endourology
Zahra Najafi, Prashanta Gautam, Bradley F Schwartz, Abhilash J Chandy, Ajay M Mahajan
Ureteral peristalsis can be considered as a series of waves on the ureteral wall, which transfers the urine along the ureter toward the bladder. The stones that form in the kidney and migrate to the ureter can create a substantial health problem due to the pain caused by interaction of the ureteral walls and stones during the peristaltic motion. Three-dimensional (3D) computational fluid dynamics (CFD) simulations were carried out using the commercial code ansys fluent to solve for the peristaltic movement of the ureter, with and without stones...
October 1, 2016: Journal of Biomechanical Engineering
M Karzova, B Cunitz, P Yuldashev, Y Andriyakhina, W Kreider, O Sapozhnikov, M Bailey, V Khokhlova
Newer imaging and therapeutic ultrasound technologies require higher in situ pressure levels compared to conventional diagnostic values. One example is the recently developed use of focused ultrasonic radiation force to move kidney stones and residual fragments out of the urinary collecting system. A commercial diagnostic 2.3 MHz C5-2 array probe is used to deliver the acoustic pushing pulses. The probe comprises 128 elements equally spaced at the 55 mm long convex cylindrical surface with 38 mm radius of curvature...
June 2015: AIP Conference Proceedings
Ju G Aljaev, V S Saenko, S V Pesegov
This article presents the experience of applying 3D-computer simulation for treatment planning in patients with coral kidney stones. The impact of the kidney internal structure and the nephrolithiasis stage on the treatment results of the patients with staghorn stones are analyzed on the basis of authors' own experience. They note the usefulness of computer modeling in preoperative planning for improving the treatment results and preventing intraoperative complications.
July 2015: Urologii︠a︡
El-Sayed H Ibrahim, Robert A Pooley, Mellena D Bridges, Joseph G Cernigliaro, William E Haley
Computed tomography (CT) is the current gold standard for imaging kidney stones, albeit at the cost of radiation exposure. Conventional magnetic resonance imaging (MRI) sequences are insensitive to detecting the stones because of their appearance as a signal void. With the development of 2D ultra-short echo-time (UTE) MRI sequences, it becomes possible to image kidney stones in vitro. In this work, we optimize and implement a modified 3D UTE MRI sequence for imaging kidney stones embedded in agarose phantoms mimicking the kidney tissue and in urine phantoms at 3...
2014: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Shuai Leng, Maria Shiung, Songtao Ai, Mingliang Qu, Terri J Vrtiska, Katharine L Grant, Bernhard Krauss, Bernhard Schmidt, John C Lieske, Cynthia H McCollough
OBJECTIVE: The objective of our study was to show the feasibility of distinguishing between uric acid (UA) and non-UA renal stones using two consecutive spatially registered low- and high-energy scans acquired on a conventional CT system. SUBJECTS AND METHODS: A total of 33 patients undergoing clinically indicated dual-source dual-energy CT examinations to differentiate UA from non-UA renal stones were enrolled in this study. Immediately after patients underwent clinically indicated dual-source dual-energy CT, two consecutive scans (one at 80 kV and one at 140 kV) were obtained on a conventional CT scanner over the region limited to the stones identified on the dual-source scans...
January 2015: AJR. American Journal of Roentgenology
Louise Stone
No abstract text is available yet for this article.
August 2014: Nature Reviews. Urology
Marianne Brehmer, Mats O Beckman, Anders Magnusson
OBJECTIVE: Percutaneous nephrolithotripsy (PCNL) has become the gold standard for treatment of renal stones larger than 2 cm. To optimize the surgical procedure a method for meticulous preoperative three-dimensional computed tomography (3D-CT) planning was developed and analysed. The aim of this study was to evaluate how 3D-CT influenced the choice of access route and treatment outcome. MATERIAL AND METHODS: Patients planned for PCNL were included in a prospective study...
June 2014: Scandinavian Journal of Urology
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