Optimum Gray Level Narendhran Vijayakumar 02/08/2008.

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Optimum Gray Level Narendhran Vijayakumar 02/08/2008

Image properties ModalityNo of bits DimensionFOVResolution (pixels per mm) T2FLAIR16512x512220mmx220mm2.327 DWEPI16256x256280mmx280mm0.914 DIFFRAD16256x256256mmx256mm

Choosing Gray Levels Tradeoff between accuracy and computation time Ways to determine effective gray levels – Histogram Involves guess work – Entropy measure Guessing not required 3

Entropy measure of T2 FLAIR 4

Mutual Information 5

Conclusion Effective number of gray levels – 11 bits => 2048 Levels MI of T2FLAIR/Radial diffusion – Higher than T2FLAIR/DWEPI – Quantitatively proves Radial Diffusion is better 6