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In this paper we used DCT (Discrete Cosine Transform) and DWT (Discrete Wavelet Transform) to achieve optimal compression ratio for two types of medical images (CT scan and MRI) with keeping good quality of these images. In 2D-DCT; the image is broken up into blocks of n × m pixels p xy (with n=m= 8 typically), and then 2D-DCT is used to produce a block of n × m DCT coefficients for each block of pixels, the result coefficients are quantized, which must result in lossy but highly efficientdoi:10.14738/aivp.26.771 fatcat:4erewqn3zvch5bs7ionugdouxy