Significance of Region of Interest Applied on MRI and CT Images in Teleradiology-Telemedicine
Within the expanding paradigm of medical imaging in Teleradio- logy-Telemedicine, there is increasing demand for transmitting diagnostic medical imagery. These are usually rich in radiological contents, especially in slicing modalities, and the associated
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National University of Sciences and Technology, Karachi-Campus, Pakistan {tariqjavid,pervez}@pnec.edu.pk 2 Sir Syed University of Engineering & Technology, Karachi, Pakistan {mibhatti,mabdul}@ssuet.edu.pk
Abstract. Within the expanding paradigm of medical imaging in Teleradiology-Telemedicine, there is increasing demand for transmitting diagnostic medical imagery. These are usually rich in radiological contents, especially in slicing modalities, and the associated file sizes are large which must be compressed with minimal file size to minimize transmission time and robustly coded to withstand required network medium. It has been reinforced through extensive research that the diagnostically important regions of medical images, Regions of Interest, must be compressed by lossless or near lossless algorithm, while on the other hand, the background region be compressed with some loss of information but still recognizable using JPEG2000 standard. Applying on MRI and CT scan images achieved different high compression ratios with varying quantization levels analogously reduced transmission time depending on sources of energy, the MAXSHIFT method proved very effective both objectively and subjectively.
1 Introduction The objectives of teleradiology-telemedicine are to improve access and to enhance overall quality of care at an affordable cost. Improved access and cost savings could be achieved by allowing a doctor to remotely examine patients or to consult with a specialist. This reduces or eliminates the time and expense of travel necessary to bring the patient to the doctor or the doctor to the patient [1]. Quality of care is improved by providing the diagnostically important images. Rigorous research in diagnostic imaging and image compression in teleradiology-telemedicine is gaining prominence all over the world, particularly in developing countries [2]. Engineers are developing technologies and tools, enabling the medical practitioners to provide efficient treatment. From the elaborate medical information, the doctor prefers to focus on certain selected region(s) of interest. Also the doctors are more comfortable with image processing and analysis solutions that offer subjective analysis of medical images more than depending on the objective engineering results alone. Technology assisted, integrated diagnostic methods are of high relevance in this context [3]. A CT scanner, See Fig. 1, uses X-rays, a type of ionizing radiation, to acquire its images, making it a good tool for examining tissue composed of elements of a X. Gao et al. (Eds.): MIMI 2007, LNCS 4987, pp. 151–159, 2008. © Springer-Verlag Berlin Heidelberg 2008
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relatively higher atomic number than the tissue surrounding them, such as bone and calcifications (calcium based) within the body (carbon based flesh), or of structures (vessels, bowel). MRI, See Fig. 1, on the other hand, uses nonionizing radio frequency (RF) signals to acquire its images and is best suited for non-calcified tissue. For purposes of tumor detection and identifi
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