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Related Concept Videos

Urinary Tract Calculi VI: Surgical Management01:25

Urinary Tract Calculi VI: Surgical Management

Procedures for Kidney StonesMedical intervention is necessary when kidney stones or renal calculi are too large to pass spontaneously (typically greater than 5 millimeters) when stones are accompanied by symptomatic infection (such as fever or pyelonephritis), when they impair kidney function, or when they cause persistent symptoms like severe pain, nausea, or urinary retention. Additionally, patients with only one kidney or those who cannot be treated with medical management also require...
Imaging Studies V: Intravenous Urography and Retrograde Pyelography01:22

Imaging Studies V: Intravenous Urography and Retrograde Pyelography

IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
Imaging Studies I: Kidney, Ureter, and Bladder Studies01:28

Imaging Studies I: Kidney, Ureter, and Bladder Studies

Kidney, Ureter, and Bladder (KUB) StudiesKidney, Ureter, and Bladder (KUB) studies are standard diagnostic imaging procedures used to assess the anatomy of the urinary system. They are commonly utilized for patients experiencing abdominal pain or urinary symptoms. By using a simple X-ray of the abdomen, KUB studies can reveal structural and pathological abnormalities within the kidneys, ureters, and bladder. These studies are particularly valuable in diagnosing kidney stones, urinary...
Imaging Studies VI: Voiding Cystourethrography and Cystography01:22

Imaging Studies VI: Voiding Cystourethrography and Cystography

Voiding Cystourethrography (VCUG) and Cystography are specialized radiographic procedures used to examine the structure and function of the bladder and urethra.Voiding Cystourethrography (VCUG)A Voiding Cystourethrogram (VCUG) is a diagnostic imaging procedure that assesses the anatomy and function of the lower urinary tract. It focuses on the bladder, bladder neck, and urethra, helping detect abnormalities such as vesicoureteral reflux (VUR)—the backward or reverse flow of urine into the...

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Related Experiment Video

Updated: Jun 12, 2026

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition
03:19

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

Published on: June 21, 2024

An algorithm for calculi segmentation on ureteroscopic images.

Benoît Rosa1, Pierre Mozer, Jérôme Szewczyk

  • 1UPMC Univ Paris 06, UMR 7222, ISIR, 75005, Paris, France. benoit.rosa@centraliens.net

International Journal of Computer Assisted Radiology and Surgery
|June 25, 2010
PubMed
Summary
This summary is machine-generated.

This study developed a region growing algorithm to segment renal calculi in ureteroscopic images, achieving over 90% accuracy. This automated segmentation is crucial for guiding laser lithotripsy during ureteroscopy.

Related Experiment Videos

Last Updated: Jun 12, 2026

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition
03:19

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

Published on: June 21, 2024

Area of Science:

  • Medical Imaging
  • Urology
  • Computer Vision

Background:

  • Renal calculi (kidney stones) are a common cause of urological obstruction.
  • Ureteroscopy with laser lithotripsy is a standard treatment for kidney stones.
  • Automating stone segmentation is vital for precise laser targeting during ureteroscopy.

Purpose of the Study:

  • To develop an automated algorithm for segmenting renal calculi in real-time ureteroscopic images.
  • To enable image guidance for a laser-based system designed to vaporize kidney stones.
  • To improve the efficiency and precision of laser lithotripsy procedures.

Main Methods:

  • A region growing algorithm was developed and implemented.
  • The algorithm was trained and validated using real ureteroscopic video images.
  • Segmentation performance was evaluated against expert-defined ground truth using metrics like Precision and Recall.

Main Results:

  • The developed algorithm demonstrated high accuracy in segmenting renal calculi.
  • The algorithm correctly identified over 90% of the calculus surface area.
  • Segmentation parameters were optimized for typical clinical scenarios.

Conclusions:

  • Automated segmentation of renal calculi from ureteroscopic images is technically feasible.
  • The developed algorithm shows promise for integration into automated laser lithotripsy systems.
  • Future work includes incorporating the algorithm into a motorized system for a functional prototype.