Abstract
We read with interest the article entitled “Detection of Intratumoral Calcification in Oligodendrogliomas by Susceptibility-Weighted MR Imaging”[1][1] and would like to comment on the appearance of calcification on the high-pass-filtered phase images. The authors reported that the paramagnetic
Highlights
We read with interest the article entitled “Detection of Intratumoral Calcification in Oligodendrogliomas by Susceptibility-Weighted MR Imaging”[1] and would like to comment on the appearance of calcification on the high-pass-filtered phase images
The authors reported that the paramagnetic hemorrhagic component of the tumor would cause a negative phase shift and appear as dark signal on the highpass-filtered phase images, while the diamagnetic intratumoral calcifications would cause an opposite positive phase shift and appear as bright signal on the highpass-filtered phase images
This description is true, but only in the case of right-handed MR imaging systems, while in left-handed MR imaging systems, the complete opposite signal would be seen: Paramagnetic substances would appear bright, while diamagnetic substances would appear dark.[2,3] In Figs 2D and 3D of the above-mentioned article, the highpass-filtered phase images are those of a left-handed MR imaging system, evident by the bright signal of the veins (paramagnetic deoxyhemoglobin).[3]
Summary
We read with interest the article entitled “Detection of Intratumoral Calcification in Oligodendrogliomas by Susceptibility-Weighted MR Imaging”[1] and would like to comment on the appearance of calcification on the high-pass-filtered phase images.
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