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Fig. 1 —Diagram for calculating thickness of peritumoral and tumoral
enhancement from rim enhancement of tumor on arterial phase dynamic MR images.
Left drawing is schema of tumor on precontrast T1-weighted MR image and right
is for rim enhancement of same lesion on arterial phase dynamic MR image.
Light gray area on right image represents contour of tumor, not delineated on
arterial phase images because of superimposed rim enhancement in inner and
outer portion of tumor margin. Horizontal dotted line is imaginary line along
longest dimension for lesion, used for reference plane to measure tumor size
(a), outer (b), and inner (c) dimension of rim enhancement after
synchronization of anatomic level of arterial phase images with nonenhanced
images. Outer thickness of rim enhancement was estimated by subtracting a from
b, and result was regarded as thickness of circumferential perilesional
enhancement. Inner thickness of rim enhancement was estimated by subtracting c
from a, and result used to represent tumor vascularity in periphery of each
lesion.
