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Computed Tomography01:10

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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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Clinical Imaging of Microwave Mammography
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Clinical digital breast tomosynthesis system: dosimetric characterization.

Steve Si Jia Feng1, Ioannis Sechopoulos

  • 1Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, GA 30322, USA.

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|February 15, 2012
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Digital breast tomosynthesis (DBT) involves a slightly higher mean glandular dose (MGD) than digital mammography, but remains within safety limits for effective breast cancer screening.

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Area of Science:

  • Medical Physics
  • Radiology
  • Biomedical Imaging

Background:

  • Digital breast tomosynthesis (DBT) offers advanced 3D imaging for mammography.
  • Accurate dosimetry is crucial for patient safety in breast imaging.
  • Understanding radiation dose differences between DBT and FFDM is essential for clinical practice.

Purpose of the Study:

  • To comprehensively characterize the dosimetric properties of a clinical DBT system.
  • To compare the mean glandular dose (MGD) between DBT and FFDM for various breast parameters.
  • To evaluate radiation dose in the context of regulatory limits.

Main Methods:

  • Used compressible phantoms to simulate different breast sizes and compositions.
  • Employed automatic exposure control (AEC) on the Selenia Dimensions system in both DBT and FFDM modes.
  • Utilized Monte Carlo simulations and empirical measurements to calculate MGD.

Main Results:

  • DBT acquisitions showed a range of MGD from 0.657 to 3.52 mGy.
  • For a 5cm, 50% glandular breast, DBT MGD was 8% higher than FFDM (1.30 vs 1.20 mGy).
  • For a 6cm, 14.3% glandular breast, DBT MGD was 83% higher than FFDM (2.12 vs 1.16 mGy).

Conclusions:

  • The MGD for 2D-3D fusion imaging is within acceptable limits.
  • DBT radiation dose is comparable to FFDM for certain breast types.
  • The system's dosimetric performance supports its use in screening mammography.