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X-ray-induced acoustic computed tomography (XACT) shows feasibility for 3D detection of early breast microcalcifications. This low-dose imaging technique offers true 3D visualization, overcoming mammography

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Acoustic Tomography

Background:

  • Mammography faces limitations in 3D breast imaging due to tissue superposition.
  • Early detection of un-palpable microcalcifications is crucial for breast cancer diagnosis.

Purpose of the Study:

  • To demonstrate the feasibility of 3D X-ray-induced acoustic computed tomography (XACT) for detecting early breast microcalcifications.
  • To provide true 3D imaging of the breast volume, overcoming mammographic limitations.

Main Methods:

  • A 3D digital breast phantom was created from 2D CT slices, with distinct tissue types and embedded microcalcifications.
  • Simulations using the Matlab K-Wave toolbox modeled X-ray-induced acoustic wave generation, propagation, and ultrasound detection.
  • The XACT system was characterized by simulating microcalcification detection at various locations within the phantom.

Main Results:

  • The XACT system successfully visualized microcalcification clusters in 3D without tissue superposition.
  • Detection of microcalcifications as small as 100 μm was achieved with high contrast, SNR, and CNR.
  • The required radiation dose was 0.4 mGy, significantly lower (one-tenth) than conventional mammography.

Conclusions:

  • 3D breast XACT is feasible for detecting early, un-palpable breast lesions.
  • The proposed system configuration shows potential as a low-dose screening and diagnostic tool.
  • Further development could enhance early breast cancer detection capabilities.