The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

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.