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Relevance of Prostatic Fluid on the Apparent Diffusion Coefficient: An Inversion Recovery Diffusion-Weighted Imaging

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  • 1From the Institute of Radiology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (D.S., S.B., M.B., R.J., M.M., F.G., D.H., M.U., F.B.L.); Section for Biomedical Physics, Department of Radiation Oncology, University of Tübingen, Tübingen, Germany (M.M.); Department of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany (T.A.K.); Institute of Neuroradiology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (M.Z.); and Department of Artificial Intelligence in Biomedical Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (M.Z.).

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Summary
This summary is machine-generated.

Prostate cancer imaging using diffusion-weighted imaging (DWI) can be improved. Adjusting fluid suppression with inversion recovery preparation enhances apparent diffusion coefficient (ADC) contrast for better lesion detection.

Keywords:
diagnostic imagingdiffusion magnetic resonance imagingfeasibility studymagnetic resonance imagingprospective studyprostate cancer

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Area of Science:

  • Radiology
  • Medical Imaging
  • Prostate Cancer Research

Background:

  • Diffusion-weighted imaging (DWI) is crucial for prostate MRI.
  • Reduced apparent diffusion coefficient (ADC) in prostate cancer is linked to microstructural changes.
  • Decreased fluid-containing lumen volume may contribute to lower ADC in tumors.

Purpose of the Study:

  • To investigate the nature of ADC contrast in prostate tissue.
  • To explore how fluid suppression affects ADC measurements.
  • To understand the role of fluid content in prostate DWI signal.

Main Methods:

  • Prospective study using inversion recovery-prepared DWI.
  • Acquired DWI with b-values of 50 and 800 s/mm² at 16 inversion times (TI).
  • Analyzed ADC using a 2-compartment model (tissue and fluid).

Main Results:

  • ADC map appearance varied significantly with TI, showing a feature-rich ADC(TI) curve.
  • Healthy prostate tissue ADC increased with TI up to ~1100ms, then decreased.
  • This TI-dependent ADC behavior was less pronounced in prostate cancer, suggesting altered fluid contribution.

Conclusions:

  • Prostate fluid content significantly influences measured ADC values.
  • Optimizing inversion recovery preparation can modulate fluid contribution.
  • This technique holds potential for enhancing contrast in prostate cancer detection via DWI.