Fig. 1

Semi-quantification of periphery calcification (white dots in gray background) and central liquefaction (wavy lines in black circle) of lesions (⊗ with dashed lines). a Calcification at lesion periphery was quantified mainly based on proportion of calcified area at periphery of the lesion and graded into three degrees [0%(−), < 50%(+) and ≥ 50%(++), respectively similar to non-calcification, micro calcification and macro calcifications]; b liquefaction at lesion center was quantified mainly based on proportion of liquefied area at center of the lesion and graded into four degrees [0%(−), < 50%(+), 50 ~ 75%(++) and ≥ 75%(++), respectively denoted as non-liquefaction, minor liquefaction and major liquefactions] according to liquefaction-to-lesion volumetric ratio