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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Reproducibility of spatial penalty-based methodologies for intravoxel incoherent motion analysis with diffusion MRI.

Esha Baidya Kayal1, Shuvadeep Ganguly2, Devasenathipathy Kandasamy3

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Spatial penalty-based intravoxel incoherent motion (IVIM) methods, specifically BE+TV and BE+HPF, offer improved precision and reproducibility for diffusion coefficient (D), perfusion coefficient (D*), and perfusion fraction (f) in osteosarcoma patients compared to conventional models.

Keywords:
Intravoxel incoherent motionPrecisionQuantitative comparisonReproducibilitySpatial penalty based IVIM method

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Area of Science:

  • Medical Imaging
  • Radiology
  • Oncology

Background:

  • Intravoxel incoherent motion (IVIM) magnetic resonance imaging (MRI) is a valuable technique for assessing tissue microenvironment.
  • Conventional bi-exponential (BE) IVIM models face challenges in precision and reproducibility, particularly in dynamic studies like chemotherapy response assessment.
  • Spatial penalty-based methods offer potential improvements in IVIM parameter estimation.

Purpose of the Study:

  • To compare the precision and reproducibility of spatial penalty-based IVIM methods (BE+TV, BE+HPF) against conventional BE models.
  • To evaluate IVIM parameter estimation (D, D*, f) in osteosarcoma patients undergoing neoadjuvant chemotherapy.
  • To determine the efficacy of different IVIM fitting methodologies in clinical settings.

Main Methods:

  • IVIM MRI was performed on 40 osteosarcoma patients at baseline, after 1 cycle, and after 3 cycles of chemotherapy using 11 b-values (0-800 s/mm²).
  • Diffusion coefficient (D), perfusion coefficient (D*), and perfusion fraction (f) were estimated using five methods: BE, BESeg-2, BESeg-1, BE+TV, and BE+HPF.
  • Within-subject (wCV) and between-subject (bCV) coefficients of variation were calculated for healthy muscle and tumor tissues to assess precision and reproducibility.

Main Results:

  • BE+TV and BE+HPF methods demonstrated significantly lower wCV and bCV for D, D*, and f compared to conventional BE, BESeg-2, and BESeg-1 methods (p < 10⁻³).
  • These improvements in precision and reproducibility were observed across all three time-points in both healthy muscle and tumor tissues.
  • Spatial penalty-based methods showed substantially reduced variability in IVIM parameter estimation.

Conclusions:

  • Spatial penalty-based IVIM analysis methods (BE+TV and BE+HPF) offer superior precision and reproducibility over conventional methods.
  • These advanced IVIM techniques are well-suited for clinical applications, including monitoring treatment response in osteosarcoma.
  • The improved reliability of BE+TV and BE+HPF enhances their utility in quantitative MRI studies.