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Related Concept Videos

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...
Computed Tomography01:10

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.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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Factors affecting prostate volume estimation in computed tomography images.

Cheng-Hsiu Yang1, Shyh-Jen Wang, Alex Tong-Long Lin

  • 1Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|March 6, 2010
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Summary

This study found that computed tomography (CT) slice thickness and apex localization methods minimally impact prostate volume estimation. Prostate volume calculations using CT showed strong correlation with transabdominal ultrasonography.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Urology

Background:

  • Accurate prostate volume estimation is crucial for diagnosis and treatment planning.
  • Computed tomography (CT) is a common imaging modality for prostate assessment.
  • Variability in CT parameters and methodology can affect volume accuracy.

Purpose of the Study:

  • To investigate the influence of apex-localizing methods and CT slice thickness on CT-based prostate volume estimation.
  • To identify key factors affecting prostate volume calculation accuracy.
  • To correlate CT-based prostate volume with transabdominal ultrasonography measurements.

Main Methods:

  • CT scans were performed on 28 volunteers for prostate volume evaluation.
  • Contour segmentation was done by three observers using ischial tuberosities and penile bulb as apex references.
  • CT slice thickness varied from 0.08-0.48 cm to assess its impact on volume estimation.

Main Results:

  • Volume deviation remained within ± 3 cm³ despite variations in slice thickness and apex localization.
  • Maximum error in apex identification was 1.5 times the CT slice thickness.
  • Strong positive correlation (r > 0.87, p < 0.0001) was observed between CT and transabdominal ultrasonography prostate volume estimates.

Conclusions:

  • CT slice thickness and apex localization methods have a limited effect on prostate volume estimation accuracy.
  • CT-based prostate volume estimation is reliable and correlates well with transabdominal ultrasonography.
  • Findings contribute to improving prostate volume estimation using CT imaging.