The Digital watermarking has been introduced for increasing the medical image security, confidentiality and integrity. The Medical image watermarking is a special sub-division of the image watermarking in the aspects that the images have some special requirements. The Medical image watermarking is an appropriate technique applied for increasing security and authentication of the medical data or information, which is very crucial and used for further diagnosis and future reference. This paper discusses the available medical image watermarking techniques for protecting and authenticating the medical data. The paper focuses on about the perceptual designing of the watermark for the digital images. The watermark designed perceptually is then embedded to the digital images in wavelet domain. A perceptual model is applied on to perceptually shape the watermark. This paper represents a primary study on the degradation of medical images when embedded with various watermarks, using a variety of the popular systems. The Image quality is measured with a number of widely used matrices, which have been used elsewhere in the image processing. The watermark before embedding can be compressed. This will lead to more secured and safely system. Also, it will take more effort to break the system. Consequently, the medical image watermarking remains an open field for the research and it appears that a selection of various watermarks for different medical image types is the most suitable solution to the generic problem.