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Related Concept Videos

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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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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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Related Experiment Video

Updated: Nov 19, 2025

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Improving linac integrated cone beam computed tomography image quality using tube current modulation.

Uros Stankovic1, Lennert S Ploeger1, Jan-Jakob Sonke1

  • 1Department of Radiation Oncology, The Netherlands Cancer Institute, Amsterdam, 1066CX, The Netherlands.

Medical Physics
|February 1, 2021
PubMed
Summary
This summary is machine-generated.

Tube current modulation (TCM) improves cone beam CT (CBCT) image quality by reducing noise anisotropicity and enhancing contrast-to-noise ratio (CNR). Its effectiveness varies with scatter conditions, showing greater benefits in lower scatter environments for radiotherapy image guidance.

Keywords:
cone beam CTimage qualitynoise power spectrumtube current modulation

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Medical Imaging

Background:

  • Linac integrated cone beam CT (CBCT) is crucial for radiotherapy image guidance.
  • Current CBCT systems use constant imaging fluence, causing anisotropic noise and suboptimal image quality for non-circular objects.
  • Tube current modulation (TCM) is a known technique to improve image quality in conventional CT.

Purpose of the Study:

  • To implement and evaluate Tube Current Modulation (TCM) on a linac integrated CBCT scanner.
  • To assess the impact of TCM on image quality under varying scatter conditions and scatter correction strategies.
  • To investigate the potential of TCM for improving CBCT image quality in radiotherapy.

Main Methods:

  • TCM was implemented on a nonclinical Elekta Versa HD linear accelerator using pulse width modulation controlled by Arduino microcontrollers.
  • Image quality was assessed using a custom phantom, analyzing the anisotropicity of 2D noise power spectra (NPS) and contrast-to-noise ratio (CNR).
  • Scatter conditions were varied using different collimators and an antiscatter grid (ASG) to evaluate TCM's performance.

Main Results:

  • TCM application resulted in a 30-78% reduction in angular anisotropicity of the NPS.
  • Image quality improvements, specifically CNR, were dependent on scatter levels.
  • CNR improved by approximately 30% in low scatter conditions and 12% in high scatter conditions.

Conclusions:

  • Tube current modulation (TCM) demonstrates potential for enhancing CBCT image quality.
  • The degree of image quality improvement with TCM is contingent upon the amount of detected x-ray scatter.
  • Further optimization of TCM strategies may be needed for high scatter environments in radiotherapy.