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CSF Pulsation Artifacts on ADC Maps Obtained with Readout-segmented EPI.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Neuroimaging

Background:

  • Diffusion-weighted imaging (DWI) is crucial for assessing tissue microstructure.
  • Readout-segmented EPI (rs-EPI) minimizes distortion in DWI.
  • Cerebrospinal fluid (CSF) pulsation artifacts can affect apparent diffusion coefficient (ADC) maps, particularly with increased readout segments.

Purpose of the Study:

  • To evaluate the impact of the number of readout segments (NRS) on CSF pulsation artifacts in ADC maps.
  • To investigate the relationship between NRS and artifact severity in healthy volunteers.

Main Methods:

  • 10 healthy volunteers underwent DWI using rs-EPI at b-values of 0 and 1000 s/mm².
  • The number of readout segments (NRS) was varied at 5, 7, and 9.
  • Apparent diffusion coefficient (ADC) maps were generated, and artifact severity was assessed quantitatively (standard deviation in ROIs) and qualitatively (artifact grading).

Main Results:

  • Quantitative analysis showed a trend of increasing standard deviation with higher NRS, but without statistical significance.
  • Qualitative analysis revealed a statistically significant increase in CSF pulsation artifact scores with higher NRS (5 vs. 9 segments and 7 vs. 9 segments).

Conclusions:

  • The number of readout segments (NRS) in rs-EPI DWI significantly affects the severity of CSF pulsation artifacts on ADC maps.
  • Higher NRS values are associated with increased artifact burden, potentially impacting diagnostic accuracy.