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Home > Diagnostically Lossless Compression of Medical Images

Diagnostically Lossless Compression of Medical Images

Thesis Info

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External Link

Author

Robina Ashraf

Program

PhD

Institute

National University of Sciences & Technology

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2008

Thesis Completion Status

Completed

Subject

Mechanical Engineering

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/524

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727737386

Similar


Medical images are very important for diagnostics and therapy. However, digital imaging generates large amounts of data which need to be compressed, without loss of relevant information, to economize storage space and allow speedy transfer. In this research three techniques are implemented for medical image compression, which provide high compression ratios with no loss of diagnostic quality. Different image modalities are employed for experiments in which X-rays, MRI, CT scans, Ultrasounds and Angiograms are included. The proposed schemes are evaluated by comparing with existing standard compression techniques like JPEG, lossless JPEG2000, LOCOI and Huffman Coding. In a medical image only a small region is diagnostically relevant while the remaining image is much less important. This is called Region of Interest (ROI). The first approach compresses the ROI strictly losslessly and the remaining regions of the image with some loss. In the second approach an image is first compressed at a high compression ratio but with loss, and the difference image is then compressed losslessly. Difference image contain less data and is compressed more compactly than original. Third approach exploits inter-image redundancy for similar modality and same part of human body. More similarity means less entropy which leads to higher compression performance. The overall compression ratio is combination of lossy and lossless compression ratios. The resulting compression is not only strictly lossless, but also expected to yield a high compression ratio. These techniques are based on self designed Neural Network Vector Quantizer (NNVQ) and Huffman coding. Their clever combination is used to get lossless effect. These are spatial domain techniques and do not require frequency domain transformation. i An overall compression ratio of 6-14 is obtained for images with proposed methods. Whereas, by compressing same images by a lossless JPEG2K and Huffman, compression ratio of 2 is obtained at most. The main contribution of the research is higher compression ratios than standard techniques in lossless scenario. This result will be of great importance for data management in a hospital and for teleradiology.
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طاقت کا زور

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N-Zn Dynamics under Different Rice Production Systems

Water scarcity and nutrient availability constraints rice production and interact mutually to affect potential crop yields. Two field studies were conducted during 2008-09 to monitor N-Zn dynamics under alternate wetting and drying (AWD) and direct seeded aerobic rice (DSR) in comparison to conventional transplanting (TPR). It comprised of application of recommended N (143 kg ha-1) in two or three splits and soil or foliar Zn (25 kg ha-1; ZnSO4, 21%) at basal or transplanting, tillering and panicle initiation in experiment No. 1 & 2 for each of the rice system respectively. Crop response in terms of soil N and Zn, plant uptake, improved growth, chlorophyll contents, yield and quality was better in 2008 than 2009. Soil NH4+-N or NO3--N contents, total plant N and its translocation into leaf, stem and panicles was high with application of three (1/2 basal+1/4 tillering+1/4 anthesis) or 1/3 (at basal+tillering+ anthesis) and two N splits (1/2 basal+1/2 anthesis) than other splits in TPR, AWD and DSR during both seasons respectively. Total dry matter accumulation, LAI, pre and post-anthesis LAD, CGR and NAR were also higher in DSR with two equal (1/2) splits (basal+anthesis) and were followed by TPR and AWD for three splits (1/2 basal+1/4 tillering+1/4 anthesis) during 2008. During 2009, total dry matter accumulation was high in DSR and was followed by TPR and AWD while Chl contents, LAI, LAD, CGR and NAR were higher in TPR followed by AWD and DSR with three or two equal (1/3) splits at (basal+tillering+ anthesis) or transplanting+tillering and 1⁄2 (basal+ anthesis) in TPR, AWD and DSR respectively. Improved N nutrition with three or two splits resulted in increased leaf water potential with greater osmotic potential and high turgor maintenance in 2008 than 2009 with lower values of plant water relations. Similar response was found for improved yield and yield components Nonetheless, effect on 1000-kernel weight in 2008 and sterile spikelets were non-significant in 2009 respectively. Kernel and straw yields while harvest index were also higher with application of three or two equal N splits in DSR, TPR and AWD in 2008 while response was opposite in 2009 with order of increase in straw and kernel yield and harvest index in TPR>AWD>DSR respectively. Regarding kernel quality, effect for abortive and chalky kernels was non-significant among the production systems in 2008. However, percentage of opaque, chalky and abortive kernels was high in DSR decreasing normal kernel percentage in both seasons than AWD and TPR with improved kernel quality. Kernel length in both seasons while kernel width was non- significant during 2008 and 09 respectively with significant interaction and kernel water absorption ratio, kernel proteins were high with low amylose contents with three or two N split applications in all three cultivation systems. High water productivity was observed in AWD and DSR than TPR during 2008 and for AWD in 2009 with two or three splits. Due to increased kernel yield, farmer’s profitability in terms of benefit: cost benefit ratio was also high with three or two splits in TPR, AWD and DSR during both seasons. In case of experiment No. 2, soil Zn application at tillering or panicle initiation increased the plant or soil Zn contents in TPR, AWD and DSR respectively during 2009 and increased Zn distribution from leaves or stem towards panicle in comparison to high soil and plant Zn contents with soil application at transplanting and tillering in AWD and DSR while for foliar applied Zn in TPR respectively. Soil applied Zn at seeding in DSR also increased crop field emergence while high dry matter accumulation, Chl contents, LAI, pre- and post-anthesis LAD, CGR and NAR was the result of soil applied Zn at tillering and transplanting in AWD and DSR while for foliar applied Zn in TPR during 2008. However, soil Zn application at tillering or panicle initiation resulted in better crop growth in all three rice systems in 2009. Similar trend was observed for yield and yield components and spikelet sterility was also reduced with soil Zn application at transplanting and tillering or foliar applied Zn at panicle initiation in AWD, DSR and TPR during 2008 than 2009. Straw and kernel yield and harvest index were also high during 2008 than 2009 with similar response among the rice systems. Zn application at these stages also improved the plant water status with maintenance of high turgor. 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