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Objective <p>To develop a non-iterative method for applying elliptical field-of-view (FOV) to radial imaging and evaluate it for Stack-Of-Stars (SOS) with variable radial density in the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({k}_{z}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>k</mi> <mi>z</mi> </msub> </math></EquationSource> </InlineEquation> direction.</p> Materials and methods <p>New analytic expressions were derived to compute the radial profile angles for an elliptical FOV with and without golden angle sampling. With a major-to-minor-axis FOV ratio of 1:0.5, anisotropic FOV and variable density SOS were evaluated, using point spread function analysis, phantom imaging, and in vivo pelvic imaging.</p> Results <p>Compared with conventional SOS, elliptical density in <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({k}_{z}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>k</mi> <mi>z</mi> </msub> </math></EquationSource> </InlineEquation> reduced scan time by 20%, while maintaining similar levels of radial aliasing artifacts. Anisotropic FOV reduced scan time by 31%, resulting in similar levels of radial aliasing artifacts at low undersampling for objects with matching in-plane anisotropy. Combining both techniques resulted in a 45% scan time reduction. Alternatively, when compared to conventional SOS using identical scan time, variable density and anisotropic FOV both displayed a lower level of radial aliasing artifacts, although for anisotropic FOV this effect was less pronounced at higher undersampling.</p> Discussion <p>Variable density and anisotropic FOV can reduce scan time and/or reduce aliasing artifacts for SOS. The new analytical expressions for elliptical FOV will facilitate future studies on anisotropic FOV radial imaging.</p>

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Variable density and anisotropic field-of-view for 3D Stack-of-Stars radial imaging

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月15日

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  • Joao Tourais,
  • Guruprasad Krishnamoorthy,
  • Jouke Smink,
  • Marcel Breeuwer,
  • Marc Kouwenhoven

摘要

Objective

To develop a non-iterative method for applying elliptical field-of-view (FOV) to radial imaging and evaluate it for Stack-Of-Stars (SOS) with variable radial density in the \({k}_{z}\) k z direction.

Materials and methods

New analytic expressions were derived to compute the radial profile angles for an elliptical FOV with and without golden angle sampling. With a major-to-minor-axis FOV ratio of 1:0.5, anisotropic FOV and variable density SOS were evaluated, using point spread function analysis, phantom imaging, and in vivo pelvic imaging.

Results

Compared with conventional SOS, elliptical density in \({k}_{z}\) k z reduced scan time by 20%, while maintaining similar levels of radial aliasing artifacts. Anisotropic FOV reduced scan time by 31%, resulting in similar levels of radial aliasing artifacts at low undersampling for objects with matching in-plane anisotropy. Combining both techniques resulted in a 45% scan time reduction. Alternatively, when compared to conventional SOS using identical scan time, variable density and anisotropic FOV both displayed a lower level of radial aliasing artifacts, although for anisotropic FOV this effect was less pronounced at higher undersampling.

Discussion

Variable density and anisotropic FOV can reduce scan time and/or reduce aliasing artifacts for SOS. The new analytical expressions for elliptical FOV will facilitate future studies on anisotropic FOV radial imaging.