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Kidney Diseases Can Now Easily Diagnosed Using Artificial Intelligence
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Kidney Diseases Can Now Easily Diagnosed Using Artificial Intelligence

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Highlights:
  • Artificial Intelligence (AI) algorithms can classify kidney biopsy samples and help transplant pathologist
  • These methods may revolutionize the traditional diagnostics of kidney diseases

Branch of artificial intelligence in which systems analyze data, identify patterns, and give calculated outputs can now be utilized to diagnose kidney diseases.

Two new studies reveal that modern machine learning—a branch of artificial intelligence in which systems learn from data, identify patterns, and make decisions—may augment traditional diagnostics of kidney disease. The findings appear in an upcoming issue of JASN.

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Kidney Diseases Can Now Easily Diagnosed Using Artificial Intelligence

Pathologists often classify various kidney diseases on the basis of visual assessments of biopsies from patients' kidneys; however, machine learning has the potential to automate and augment the accuracy of classifications.

In one study, a team led by Pinaki Sarder, Ph.D. and Brandon Ginley, BS (Jacobs School of Medicine and Biomedical Sciences at the University at Buffalo) developed a computational algorithm to detect the severity of diabetic kidney disease without human intervention. The algorithm examines a digital image of a patient's kidney biopsy at the microscopic level and extracts information on glomeruli, the small blood vessels of the kidney that filter waste from the blood for excretion. These structures are known to become progressively damaged and scarred over the course of diabetes.
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There are typically 10 to 20 individual glomeruli per biopsy, and the algorithm detects the location of each glomerular sub-component in the digital images and then makes many measurements on each sub-component. "The algorithm then views all of the features measured from one patient's biopsy in a series, just like a doctor would scan a patient's biopsy going from glomerulus to glomerulus and examining each one's structure," explained Dr. Sarder. "The algorithm has a long and short term memory as it examines the glomerular structure, so it can remember and incorporate information from all glomeruli into its final analysis," added Mr. Ginley.

The researchers used their method to digitally classify biopsy samples from 54 patients with diabetic kidney disease and found substantial agreement between digital classifications and those by three different pathologists.

In another JASN article published at the same time, a team led by Jeroen van der Laak, Ph.D. and Mike Hermsen, BSc (Radboud University Medical Center, Nijmegen, the Netherlands) applied machine learning to examine kidney transplant biopsies and went beyond glomeruli to assess multiple tissue classes in the kidney. The researchers developed a machine learning model called a "convolutional neural network" (CNN) and found that it could be applied to tissues from multiple centers, for biopsies and nephrectomy samples, and for the analysis of both healthy and diseased tissues. In addition, they validated the CNN's results with standard classification methods.

"In this research, we applied artificial intelligence to analyze kidney transplant tissue accurately. This will facilitate kidney transplant research by yielding highly accurate and reproducible data characterizing disease processes, and in the longer term also lead to improved diagnoses for transplant patients, which may improve organ survival," said Dr. van der Laak. He noted that the performance of the CNN exceeded their expectations, especially the accuracy with which it could distinguish proximal tubule from distal tubule—two different types of kidney tubules. "We included eight more tissue classes, and the network did not perform equally good for all of them. For instance, determining if a tubule is in an atrophic state can be difficult for a human observer, and the network struggled with this as well. We are working on making the network better at this classification."

Ms. Hermsen added that machine learning has only been sparsely applied in the kidney field, mostly limited to detecting a single structure. "We felt that much more information should—and can—be extracted from kidney tissue in order to fully support graft assessment," she said.

Source: Newswise
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