Steganography is the powerful tool for hiding information inside useful cover medium in ways such that the hidden message is undetectable. In Greek language, stego means covered or secret and graphy means to write. Hence, steganography means covered writing. Transform domain steganography is one of the techniques used for hidden exchange of information in frequency domain and it can be defined ...

Cryptography is the study of Secret (crypto-) writing (-graphy) that is concealing the content of message from all except the sender and the receiver and to authenticate the correctness of message to the recipient. Data security is the challenging issue of today that touches many areas including computers and communication. Recent cyber security attacks have certainly played with the sentiments...

A 77-year-old man was admitted with severe stenosis of both left anterior descending and circumflex coronary arteries and mitral valve regurgitation. He underwent mitral valve replacement and coronary artery bypass grafting (CABG). During the second postoperative day, sedation having been stopped, the patient presented a left hemiplegia and homolateral central facial paralysis. Head CT performe...

We present a novel approach to visualize and explore unstructured text. The underlying technology, called TOPIC-O-GRAPHY, applies wavelet transforms to a custom digital signal constructed from words within a document. The resultant multiresolution wavelet energy is used to analyze the characteristics of the narrative flow in the frequency domain, such as theme changes, which is then related to ...

X‐rays were discovered in 1895 by Wilhelm Roentgen. Digital radiology has overtaken conventional screen‐film radiography since it was introduced in the mid‐1980s.[1] Digital imaging uses sensor of solid‐state, and information is presented and stored as an image using a computer. The dawn of the digital era in dental radiography came in 1987 with the first digital radiography system called radio...

PURPOSE To review a series of extramacular choroidal neovascular membranes (CNVMs) in the context of their choroidal features, as determined by optical coherence tomography (OCT). METHODS Patients with extramacular CNVMs were identified from a tertiary care center through a review of records. The charts and cases were reviewed using multimodal imaging including fundus photography, OCT, fluore...

Intravascular ultrasound (IVUS) is an invasive imaging modality used to visualize coronary crosssectional anatomy. IVUS technology has been proven to be superior to coronary angio graphy for assessment of vessel size, plaque composition, calcium content and lesion severity [1–3]. The role of IVUS guidance after stent implantation has been previously explored; however, limited information is ava...

A 64-slice computed tomography (CT)—coronary angio-graphy depicted a saccular aneurysm of the left coronary artery located at the bifurcation of the left main into the left anterior descending artery and the left circumflex artery (Fig. 1A). Coronary angiography confirmed the diagnosis (Fig. 1B). The LAD and CX themselves originated directly from the neck of the aneurysm (Fig. 2A and B). Fig. 1...

We analyse the neurootological data of patients attended in the Ear, Nose and Throat (E.N.T.) department of the Centro Hospitalar de Vila Nova de Gaia for a tinnitus problem. We submitted these patients to our neurootological routine evaluation. This approach is justified in a tinnitus patient because the cochleovestibular system is a unit and acts as a whole. We characterise the population tha...