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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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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)...
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Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Renal calculi, commonly termed kidney stones, are crystalline solid masses that form in the kidneys but can occur at any point within the urinary system, encompassing the kidneys, ureters, bladder, and urethra.The pathophysiology of renal stones involves several key factors: supersaturation of the urine with stone-forming constituents, changes in urine pH, a decrease in urine volume, and the presence of substances that promote or inhibit stone formation.Supersaturation of Urine: This is the...
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Cholecystitis is inflammation of the gallbladder, most commonly caused by obstruction of the cystic duct. This blockage prevents bile from draining, leading to gallbladder distension, inflammation, and potentially serious complications. This condition may present acutely or chronically and can happen with or without gallstones.EtiologyAbout 95% of cholecystitis cases are calculous, caused by gallstones blocking the cystic duct, leading to bile accumulation and inflammation of the gallbladder...
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The gallbladder is a small, pear-shaped organ that plays a crucial role in our digestive system. Measuring about 10 cm in length, it is comparable in size to a kiwi fruit and is located in a hollow area on the lower surface of the liver. The gallbladder's primary function is to store and concentrate bile, a fluid produced by the liver that aids in digestion.
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Common bile duct stones on multidetector computed tomography: attenuation patterns and detectability.

Chang Whan Kim1, Jae Hyuck Chang, Yeon Soo Lim

  • 1Department of Internal Medicine, College of Medicine, The Catholic University of Korea, 505 Banpo-Dong, Seocho-Gu, Seoul 137-701, South Korea.

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Multidetector computed tomography (MDCT) shows common bile duct (CBD) stones with 85.4% sensitivity. Stone type and size influence detectability, with a 5 mm cut-off for optimal MDCT identification of CBD stones.

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Area of Science:

  • Radiology
  • Gastroenterology
  • Medical Imaging

Background:

  • Common bile duct (CBD) stones are a significant clinical concern.
  • Accurate detection of CBD stones is crucial for effective patient management.
  • Multidetector computed tomography (MDCT) is a widely used imaging modality.

Purpose of the Study:

  • To evaluate the attenuation patterns of CBD stones using MDCT.
  • To determine the detectability of CBD stones by MDCT.
  • To correlate MDCT findings with stone characteristics and endoscopic retrograde cholangiopancreatography (ERCP) results.

Main Methods:

  • Retrospective review of 191 patients with suspected CBD stones who underwent both MDCT and ERCP.
  • Classification of CBD stone attenuation patterns on MDCT (heavily calcified, radiopaque, less radiopaque, undetectable).
  • Statistical analysis to assess the association between attenuation patterns, stone type, and detectability factors.

Main Results:

  • MDCT demonstrated CBD stones in 111 of 130 ERCP-confirmed cases (85.4% sensitivity).
  • Attenuation patterns varied, with less radiopaque stones being most common (35%).
  • Stone size (cut-off 5 mm), stone type, and patient age were significant factors for MDCT detectability.

Conclusions:

  • CBD stone radiopacity on MDCT varies with stone composition.
  • MDCT detectability is influenced by stone type and size.
  • A 5 mm stone size serves as an appropriate threshold for MDCT detection of CBD stones.