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Kidney Imaging

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109 papers 25 to 100 followers
By Isabel Acosta-Ochoa Nephrology senior staff. Valladolid. Spain
Su-Faye Lee, Meir Lichtenstein, Peter Hughes, Dinesh Sivaratnam
OBJECTIVE: Major complications including acute tubular necrosis or rejection may occur after renal transplantation. We use a semiquantitative parameter, 2 min uptake (2MU), as part of Tc mercaptoacetyltriglycine (MAG3) scintigraphy for transplant evaluation. The aim of this study were (a) to examine the utility of Tc MAG3 scintigraphy in the assessment of postsurgical complications using the renal biopsy as the gold standard and (b) examine for any correlation with 2MU with serum creatinine (sCr) at 3 and 12 months...
August 1, 2018: Nuclear Medicine Communications
Michał Błaszczyk, Paweł Cichocki, Małgorzata Bieńkiewicz, Janusz Dąbrowski, Anna Płachcińska, Jacek Kuśmierek
BACKGROUND: Ultrasound is the first-line imaging in the diagnostics of the urinary system. It provides valuable morphological information, but its usefulness in assessment of the function of renal parenchyma is limited. Dynamic renal scintigraphy provides much more accurate information about parenchymal function of kidneys and urinary outflow. The aim of the study was to establish morphological ultrasound criteria for high likelihood of obstructive uropathy. MATERIAL AND METHODS: 59 patients (38 women, 21 men, between 18 and 82 years old, average age 50) with the pelvis dilatation > 10 mm in one or both kidneys newly diagnosed in ultrasound, without earlier history of kidney and urinary tract diseases or renal surgery...
2018: Nuclear Medicine Review. Central & Eastern Europe
Harsh Singh, Om Biju Panta, Umesh Khanal, Ram Kumar Ghimire
Introduction: Renal cortical elastography has shown conflicting but promising results in evaluation of chronic kidney disease and other renal disorders. The purpose of this study was to establish a normogram of renal cortical elasticity values and assess their variation between right and left kidney and their relation with age, gender, body mass index, renal dimensions and skin to cortex distance. Methods: The study was a hospital based cross sectional study performed at Tribhuvan University Teaching Hospital, a tertiary care center in Kathmandu, Nepal...
October 2017: Journal of Medical Ultrasound
Shimona Saini, Vikas Kumar, Prakashini Koteshwara
Context: Diffusion Tensor Imaging (DTI) is a reliable noninvasive tool to assess renal function with medullary Fractional Anisotropy (FA) values showing the most consistent results. Aims: Evaluation of FA, Apparent Diffusion Coefficient (ADC) for detecting diabetic nephropathy (DN) using 1.5-Tesla magnetic resonance imaging (MRI). To determine FA and ADC values in chronic kidney disease (CKD) patients and controls, and comparing these with estimated glomerular filtiration rate (eGFR) and categorizing the stage of CKD...
April 2018: Indian Journal of Radiology & Imaging
Sharath K Bhagavatula, Paul B Shyn
Image-guided renal biopsies have an increasing role in clinical practice. Renal mass and renal parenchymal biopsy indications, techniques, and other clinical considerations are reviewed in this article. Image-guided renal mass ablation shows significant promise and increasing clinical usefulness as more studies demonstrate its safety and efficacy. Renal mass ablation indications, techniques, and other considerations are also reviewed.
August 2018: Urologic Clinics of North America
Gunnar Schley, Jutta Jordan, Stephan Ellmann, Seymour Rosen, Kai-Uwe Eckardt, Michael Uder, Carsten Willam, Tobias Bäuerle
OBJECTIVES: In human chronic kidney disease (CKD) the extent of renal tubulointerstitial fibrosis correlates with progressive loss of renal function. However, fibrosis can so far only be assessed by histology of kidney biopsies. Magnetic resonance imaging (MRI) can provide information about tissue architecture, but its potential to assess fibrosis and inflammation in diseased kidneys remains poorly defined. MATERIALS AND METHODS: We evaluated excised kidneys in a murine adenine-induced nephropathy model for CKD by MRI and correlated quantitative MRI parameters (T1, T2, and T2* relaxation times, apparent diffusion coefficient and fractional anisotropy) with histological hallmarks of progressive CKD, including renal fibrosis, inflammation, and microvascular rarefaction...
2018: PloS One
Saba Shirvani, Paweł Tokarczuk, Ben Statton, Marina Quinlan, Alaine Berry, James Tomlinson, Peter Weale, Bernd Kühn, Declan P O'Regan
OBJECTIVES: We investigated the feasibility and reproducibility of free-breathing motion-corrected multiple inversion time (multi-TI) pulsed renal arterial spin labelling (PASL), with general kinetic model parametric mapping, to simultaneously quantify renal perfusion (RBF), bolus arrival time (BAT) and tissue T1 . METHODS: In a study approved by the Health Research Authority, 12 healthy volunteers (mean age, 27.6 ± 18.5 years; 5 male) gave informed consent for renal imaging at 3 T using multi-TI ASL and conventional single-TI ASL...
July 10, 2018: European Radiology
Shinji Tanaka, Mark D Okusa
BACKGROUND: No approved pharmacological agents are available for the treatment and prevention of acute kidney injury (AKI). The nervous system has been reported to play an important role, directly or indirectly via the immune system, in the pathophysiology of AKI. Neuromodulation, such as vagus nerve stimulation and pulsed ultrasound, is emerging as an innovative therapeutic treatment for various diseases including AKI. However, lack of effective methods to selectively stimulate or inhibit neurons has hampered the complete understanding of the roles of the nervous system in AKI because electrical stimulation is nonspecific for cell types...
July 10, 2018: Nephron
Haitian Liu, Zhangjian Zhou, Xiang Li, Chenxia Li, Rong Wang, Yuelang Zhang, Gang Niu
OBJECTIVE: To evaluate stages of chronic kidney disease (CKD) by apparent diffusion coefficient (ADC) obtained from diffusion weighted imaging (DWI) using a meta-analysis. METHODS: Literature databases were searched from PubMed, Web of Science, Cochrane and Embase to identify relevant articles about DWI in CKD between 1999 and 2017. ADC values were extracted from the healthy group and CKD patients with different stages. Meta-analysis was conducted using STATA v...
June 21, 2018: British Journal of Radiology
Seth Winfree, Pierre C Dagher, Kenneth W Dunn, Michael T Eadon, Michael Ferkowicz, Daria Barwinska, Katherine J Kelly, Timothy A Sutton, Tarek M El-Achkar
Kidney biopsy remains the gold standard for uncovering the pathogenesis of acute and chronic kidney diseases. However, the ability to perform high resolution, quantitative, molecular and cellular interrogation of this precious tissue is still at a developing stage compared to other fields such as oncology. Here, we discuss recent advances in performing large-scale, three-dimensional (3D), multi-fluorescence imaging of kidney biopsies and quantitative analysis referred to as 3D tissue cytometry. This approach allows the accurate measurement of specific cell types and their spatial distribution in a thick section spanning the entire length of the biopsy...
June 5, 2018: Nephron
Tobias Kummer, Laura Oh, Mary Beth Phelan, Robert D Huang, Jason T Nomura, Srikar Adhikari
INTRODUCTION: Contrast-enhanced ultrasound (CEUS) using intravascular microbubbles has potential to revolutionize point-of-care ultrasonography by expanding the use of ultrasonography into clinical scenarios previously reserved for computed tomography (CT), magnetic resonance imaging, or angiography. METHODS: We performed a literature search and report clinical experience to provide an introduction to CEUS and describe its current applications for point-of-care indications...
July 2018: American Journal of Emergency Medicine
Nicola Schieda, Jason I Blaichman, Andreu F Costa, Rafael Glikstein, Casey Hurrell, Matthew James, Pejman Jabehdar Maralani, Wael Shabana, An Tang, Anne Tsampalieros, Christian van der Pol, Swapnil Hiremath
Use of gadolinium-based contrast agents (GBCAs) in renal impairment is controversial, with physician and patient apprehension in acute kidney injury (AKI), chronic kidney disease (CKD), and dialysis because of concerns regarding nephrogenic systemic fibrosis (NSF). The position that GBCAs are absolutely contraindicated in AKI, CKD stage 4 or 5 (estimated glomerular filtration rate [eGFR] <30 mL/min/1.73 m2 ) and dialysis-dependent patients is outdated, and may limit access to clinically necessary contrast-enhanced MRI examinations...
May 2018: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
Manuela Nestola, Nicoletta De Matthaeis, Pietro Manuel Ferraro, Paola Fuso, Stefano Costanzi, Gian Franco Zannoni, Fabrizio Pizzolante, Sabina Vasquez Quadra, Giovanni Gambaro, Gian Ludovico Rapaccini
PURPOSE: To compare contrast-enhanced ultrasonography (CEUS)-derived time-intensity (TI) curves with histological findings in kidneys of patients affected by chronic glomerulonephritides (GN) in the early stage of disease. METHODS: Research ethics committee approval and patient written informed consent were obtained. Thirty-one patients who showed clinical and laboratory signs of GN, with preserved renal function, were consecutively enrolled. They underwent kidney CEUS, from which TI curves were obtained, and kidney biopsy...
June 2018: Journal of Ultrasound
Yosuke Hirakawa, Kiichi Mizukami, Toshitada Yoshihara, Ippei Takahashi, Purevsuren Khulan, Tomoko Honda, Imari Mimura, Tetsuhiro Tanaka, Seiji Tobita, Masaomi Nangaku
Renal tubulointerstitial hypoxia is recognized as a final common pathway of chronic kidney disease and is considered a promising drug target. However, hypoxia in the tubules is not well examined because of limited detection methods. Here, we devised a method to visualize renal tubular oxygen tension with spatial resolution at a cellular level using the cell-penetrating phosphorescent probe, BTPDM1 (an iridium-based cationic lipophilic dye), and confocal phosphorescence lifetime imaging microscopy to precisely assess renal hypoxia...
June 2018: Kidney International
Vishal K Varma, Andre Kajdacsy-Balla, Sanjeev Akkina, Suman Setty, Michael J Walsh
Renal transplants have not seen a significant improvement in their 10-year graft life. Chronic damage accumulation often leads to interstitial fibrosis and tubular atrophy (IF/TA) and thus graft function loss over time. For this reason, IF/TA has been the chief suspect for a potential prognostic marker for long term outcomes. In this study, we have used infrared spectroscopic (IR) imaging to interrogate the biochemistry of regions of fibrosis from renal transplant biopsies to identify a biochemical signature that can predict rapid progression of fibrosis...
January 12, 2018: Scientific Reports
Daniel Lange, Andreas Helck, Axel Rominger, Alexander Crispin, Bruno Meiser, Jens Werner, Michael Fischereder, Manfred Stangl, Antje Habicht
Renal function of potential living kidney donors is routinely assessed with scintigraphy. Kidney anatomy is evaluated by imaging techniques such as magnetic resonance imaging (MRI). We evaluated if a MRI-based renal volumetry is a good predictor of kidney function pre- and postdonation. We retrospectively analyzed the renal volume (RV) in a MRI of 100 living kidney donors. RV was correlated with the tubular excretion rate (TER) of MAG3-scintigraphy, a measured creatinine clearance (CrCl), and the estimated glomerular filtration rate (eGFR) by Cockcroft-Gault (CG), CKD-EPI, and modification of diet in renal disease (MDRD) formula pre- and postdonation during a follow-up of 3 years...
July 2018: Transplant International: Official Journal of the European Society for Organ Transplantation
Mark D Balceniuk, Lauren Trakimas, Claudia Aghaie, Doran Mix, Khurram Rasheed, Matthew Seaman, Jennifer Ellis, Roan Glocker, Adam Doyle, Michael C Stoner
INTRODUCTION: Chronic kidney disease (CKD) is a predictor of poor outcomes for patients undergoing endovascular aortic aneurysm repair (EVAR). Anatomic severity grade (ASG) represents a quantitative mechanism for assessing anatomical suitability for endovascular aortic repair. Anatomic severity grade has been correlated with repair outcomes and resource utilization. The purpose of this study was to identify a novel renal perfusion metric as a way to assist ASG with predicting EVAR outcomes...
July 2018: Vascular and Endovascular Surgery
Wui K Chong, Virginie Papadopoulou, Paul A Dayton
Microbubble ultrasound contrast agents (UCAs) were recently approved by the Food and Drug administration for non-cardiac imaging. The physical principles of UCAs, methods of administration, dosage, adverse effects, and imaging techniques both current and future are described. UCAs consist of microbubbles in suspension which strongly interact with the ultrasound beam and are readily detectable by ultrasound imaging systems. They are confined to the blood pool when administered intravenously, unlike iodinated and gadolinium contrast agents...
April 2018: Abdominal Radiology
Vandana Dua Niyyar, W Charles O'Neill
Sonography is increasingly being performed by clinicians and has applications throughout the spectrum of nephrology, including acute and chronic renal failure, urinary obstruction, cystic disease, pain, hematuria, transplantation, kidney biopsy, temporary and permanent vascular access, and assessment of fluid status. The skill is relatively easily acquired, expedites patient care, and enhances the practice of nephrology. However, the lack of exposure in most training programs remains a major obstacle.
May 2018: Kidney International
S Benjamens, S P Berger, A W J M Glaudemans, J S F Sanders, R A Pol, R H J A Slart
BACKGROUND: Clinicians use several diagnostic modalities to recognize post-transplant complications, such as acute tubular necrosis, acute rejection, urologic and vascular complications. Currently, there is no consensus about the best procedural approach to evaluate post-transplant renal dysfunction. Renal needle-biopsy is often required, however, this is invasive and may lead to sample errors and complications, and most clinicians prefer using one of the noninvasive diagnostic modalities...
April 2018: Transplantation Reviews
2018-02-11 11:57:37
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