Purpose <p>To conduct an exploratory analysis of quantitative and semi-quantitative perfusion-weighted MRI (PWI) parameters across various intraocular lesions and assess their relationship with fluorescein angiography (FAG) features.</p> Methods <p>Thirty-eight patients with twelve different diagnoses who underwent 3T dynamic contrast-enhanced MRI (DCE-MRI) of the eye were included, with diagnosis confirmed either by histopathology or clinical course of the disease. Tofts pharmacokinetic modelling was used to calculate K<sup>trans</sup>, v<sub>e</sub>, and k<sub>ep</sub> values. Semi-quantitative relative peak intensity and outflow percentage were derived from time-intensity curves and compared with quantitative parameters. FAG images were evaluated for blocking effects, pinpoint and diffuse leakages.</p> Results <p>Median values of quantitative and semi-quantitative parameters varied across lesion types. Haemangiomas showed the highest K<sup>trans</sup> (median = 6.35&#xa0;min<sup>− 1</sup>) and k<sub>ep</sub> (median = 3.8&#xa0;min<sup>− 1</sup>). Uveal melanomas showed high K<sup>trans</sup> (median = 0.68&#xa0;min<sup>− 1</sup>) and k<sub>ep</sub> (median = 2.45&#xa0;min<sup>− 1</sup>) in comparison with choroidal naevi and metastases. Quantitative and semi-quantitative parameters showed significant correlation across all intensity groups (all R<sup>2</sup> &gt; 0.36, all <i>p</i> &lt; 0.04). The correlation between K<sup>trans</sup> and relative peak intensity differed for hypo- and isointense lesions versus hyperintense lesions (both <i>p</i> &lt; 0.002). Statistical comparison between individual diagnoses was not possible due to limited sample size per diagnosis. Quantitative PWI parameters showed correspondence with FAG features.</p> Conclusion <p>This study provided quantitative and semi-quantitative PWI parameters for various intraocular lesions. Semi-quantitative PWI parameters may provide comparable information on lesion vascularity when stratified by T1 signal intensity.</p>

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Quantitative assessment of perfusion-weighted magnetic resonance imaging for the differential diagnosis of various intraocular lesions

  • Iris Mulder,
  • Khanh Vu,
  • Teresa Ferreira,
  • Lisa Klaassen,
  • Jan-Willem Beenakker

摘要

Purpose

To conduct an exploratory analysis of quantitative and semi-quantitative perfusion-weighted MRI (PWI) parameters across various intraocular lesions and assess their relationship with fluorescein angiography (FAG) features.

Methods

Thirty-eight patients with twelve different diagnoses who underwent 3T dynamic contrast-enhanced MRI (DCE-MRI) of the eye were included, with diagnosis confirmed either by histopathology or clinical course of the disease. Tofts pharmacokinetic modelling was used to calculate Ktrans, ve, and kep values. Semi-quantitative relative peak intensity and outflow percentage were derived from time-intensity curves and compared with quantitative parameters. FAG images were evaluated for blocking effects, pinpoint and diffuse leakages.

Results

Median values of quantitative and semi-quantitative parameters varied across lesion types. Haemangiomas showed the highest Ktrans (median = 6.35 min− 1) and kep (median = 3.8 min− 1). Uveal melanomas showed high Ktrans (median = 0.68 min− 1) and kep (median = 2.45 min− 1) in comparison with choroidal naevi and metastases. Quantitative and semi-quantitative parameters showed significant correlation across all intensity groups (all R2 > 0.36, all p < 0.04). The correlation between Ktrans and relative peak intensity differed for hypo- and isointense lesions versus hyperintense lesions (both p < 0.002). Statistical comparison between individual diagnoses was not possible due to limited sample size per diagnosis. Quantitative PWI parameters showed correspondence with FAG features.

Conclusion

This study provided quantitative and semi-quantitative PWI parameters for various intraocular lesions. Semi-quantitative PWI parameters may provide comparable information on lesion vascularity when stratified by T1 signal intensity.