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Robust and distortion control dual watermarking in LWT domain using DCT and error correction code for color medical image
摘要： This paper presents lifting wavelet transform (LWT) and discrete cosine transform (DCT) based robust watermarking approach for tele-health applications. For identity authentication, 'signature watermark' of size '64 × 64' and 'patient report' of size '80' characters are hiding into the host medical image. Further, the signature watermark is encrypted by message-digest (MD5) and 'patient report' is encoded by BCH error correcting code before embedding into the host image. Experimental demonstrations indicate that the method provides sufficient robustness and security against various attacks without significant distortion between cover and watermarked image. Further, our results proved that the method offer NC value more than 0.9214 for most of the considered attacks. Furthermore, it is evident from results our method shows the improvement in robustness to previously reported techniques under consideration while providing low computational complexity.
关键词： LWT,MD5,Robustness,Complexity,DCT,BCH
更新于2025-09-23 15:22:29
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Synthesis and preclinical evaluation of 68Ga-PSMA-BCH for prostate cancer imaging
摘要： Prostate specific membrane antigen (PSMA) is a promising target for the diagnosis and therapy of prostate cancer. In this report, a NOTA-conjugated precursor, NOTA-PSMA (also named PSMA-BCH), was synthesized by peptide synthesizer with the chemical purity over 95%. 68Ga-PSMA-BCH was obtained by radiolabeling NOTA-PSMA with 68GaCl3 with >99% radiochemical purity and 59-74 GBq/μmol specific activity. In vitro and in vivo study of 68Ga-PSMA-BCH showed high stability, high uptake in PSMA-expressing cells and tumor, fast clearance and low non-target uptake. 22Rv1 tumors were clearly observed in micro-PET images of and showed good retention. Compared with 68Ga-PSMA-617, 68Ga-PSMA-BCH showed comparable tumor uptake and tumor-background ratios. Indicating 68Ga-PSMA-BCH is a promising candidate for prostate cancer imaging and worthy of further clinical investigations.
关键词： 68Ga-PSMA-BCH,PSMA,PET imaging,Prostate cancer
更新于2025-09-23 15:22:29
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[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Integration of FEC Channel-coding Schemes Based on the Bose-Chaudhuri-Hocquenghem (BCH) Code for WDM Fiber Optical Communication Systems
摘要： With the volumes of transmitted information growth, the task of increasing the noise immunity and reliability of data transmission networks arises. The presence of interference such as nonlinear loss, chromatic dispersion, polarization mode dispersion, and inter-channel interference decreases the performance of fiber optical communication systems. Forward Error Correction (FEC) codes are vital in optical communication systems to achieve highly efficient and highly reliable communication. The paper presents research on a simulation model where FEC channel-coding schemes based on the Bose-Chaudhuri-Hocquenghem (BCH) cycling block code are integrated with non-return-to-zero on-off-keying (NRZ-OOK) modulated wavelength division multiplexed (WDM) fiber optical communication systems. The results highlight the selection of coding parameters in the adopted FEC approach. In our paper, the BCH (255, 231), BCH (255, 223), and BCH (255,191) FEC channel-coding schemes are chosen for integration in the NRZ-OOK modulated WDM optical transmission system. The paper shows the main advantages and drawbacks of the selected FEC coding scheme and provides a comparison of the proposed schemes based on their main features, such as bit error ratio (BER), which were obtained through the simulations of 25 Gbit/s NRZ-OOK WDM fiber optical system. The dynamics of changes in BER was investigated using the Monte Carlo (MC) method for precise results. The paper shows that integration of FEC channel-coding schemes based on the BCH codes improves the noise immunity and reliability of the WDM Fiber Optical Communication Systems.
关键词： optical communication systems,BCH code,NRZ-OOK,WDM,FEC
更新于2025-09-23 15:21:01