Medical Image Watermarking has been considered as an appropriate method for enhancing the data security and content verification in medical science. For the purpose of achieving better security it is recommended to hide the data in the medical image itself that will improve the reliability of medical information system. In our paper, the work is divided in two main stages, first of all image is divided into two parts: Region of Interest that is defined as informational part of image and Region of Non Interest that is defined as noninformational part. In our work we have used Region of Non Interest to hide the data so that the informational part of the image kept safe. Watermark is encrypted by using RSA. A Discrete Wavelet Transform based approach is used for embedding the encrypted data in Region of Non Interest part of image for enhancing data security. The experimental result shows that watermark embedded by the proposed algorithm provides better security and can survive successfully under different attacks.

In this paper, the proposed work is about to store the patient information in the medical image itself that can be a CT scan or the MRI image. Medical records are extremely sensitive patient information and require uncompromising security during both storage and transmission. In the traditional way, the patient information and patient test reports are kept in different tables or databases or locations. But, this kind of data management can have some human oriented errors such as transfer of wrong report to a patient. Errors can be prevented by hiding the data in scan report itself. It will improve the reliability of the medical information system. In our paper the work is divided in two main stages, first to identify the ROI and RONI of the image. Here, the ROI is defined in terms of information part of medical image and RONI is defined in terms of non-information part of the MRI image. It will avoid the user to destroy the valuable information from the image. Watermark is encrypted by using RSA. The second stage is about to hide the image in RONI. A DWT based approach is used to hide such information. General TermsTo provide a two-way security to the medical images by using DWT and RSA along with the preservation of ROI.

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