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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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Updated: Aug 27, 2025

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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A C-arm photon counting CT prototype with volumetric coverage using multi-sweep step-and-shoot acquisitions.

Kevin Treb1, Xu Ji1, Mang Feng1

  • 1Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, WI 53705, United States of America.

Physics in Medicine and Biology
|September 26, 2022
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Summary

This study introduces a new C-arm photon counting detector (PCD) CT system that significantly improves image quality and low-contrast detectability over existing flat panel detector (FPD) systems. The novel step-and-shoot method enables high-quality volumetric imaging for interventional procedures.

Keywords:
CT image qualityCT systemsPhoton counting CT

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Area of Science:

  • Medical Imaging
  • Radiological Technology
  • Photon Counting Detectors

Background:

  • Current clinical C-arm interventional systems rely on flat panel detectors (FPDs) for cone-beam CT (CBCT) imaging.
  • FPD-CBCT offers volumetric coverage but lacks sufficient low-contrast detectability for specific interventional needs.

Purpose of the Study:

  • To develop and evaluate a C-arm photon counting detector (PCD) CT system using a step-and-shoot acquisition method.
  • To enhance tomographic imaging performance for interventional procedures.

Main Methods:

  • A cadmium telluride-based PCD was integrated into a biplane C-arm system alongside an FPD.
  • A synchronized motorized patient table facilitated a step-and-shoot data acquisition strategy with multiple C-arm sweeps.
  • Experiments utilized physical phantoms, a human cadaver head, and an in vivo swine subject, comparing results with FPD-CT under matched conditions.

Main Results:

  • PCD-CT images demonstrated lower noise and superior visualization of low-contrast lesions compared to FPD-CT.
  • Improved visibility of small iodinated blood vessels and finer structures was achieved with PCD-CT.
  • No geometric distortion artifacts were observed in the multi-planar PCD-CT images.

Conclusions:

  • This work presents the first successful demonstration of high-quality, multi-planar PCD-CT imaging using a rotating C-arm gantry.
  • The developed system shows significant potential for improving diagnostic capabilities in interventional radiology.