1,721,648 research outputs found
3D IMAGE PROCESSING. TECHNIQUES AND CLINICAL APPLICATIONS - Chinese Edition
No full textFew fields have witnessed such impressive advances as the application of computer technology to radiology. The progress achieved has revolutionized diagnosis and greatly facilitated treatment selection and accurate planning of procedures. This book, written by leading experts from many different countries, provides a comprehensive and up-to-date overview of the role of 3D image processing. The first section covers a wide range of technical aspects in an informative way. This is followed by the main section, in which the principal clinical applications are described and discussed in depth. To complete the picture, the final section focuses on recent developments in functional imaging and computer-aided surgery. This book will prove invaluable to all who have an interest in this complex but vitally important field
Ethanol injection for the treatment of hepatic tumours
No full textPercutaneous ethanol injection (PEI) is a relatively new therapeutic technique for the treatment of liver tumours. PEI is now considered a reliable alternative to surgical resection for cirrhotic patients with a single, small hepatocellular carcinoma (HCC). Intratumoral injection of absolute ethanol, in fact, achieves complete ablation of HCC nodules 3 cm or less in diameter with a high probability. Moreover, PEI is not associated with significant morbidity or mortality and does not damage non-cancerous liver parenchyma. Long-term survival rates of PEI-treated patients were similar to those obtained in matched patients submitted to partial hepatectomy. In large HCC lesions, the anticancer effect of PEI can be significantly enhanced by pretreatment of the tumour with transcatheter arterial chemoembolisation. PEI may also be effectively used to destroy adenomatous hyperplastic nodules in liver cirrhosis, which represent precancerous lesions. The results of PEI in the treatment of liver metastases, in contrast, have been far less encouraging than in the case of HCC, so that PEI is not recommended when other interventional procedures such as radiofrequency electrocautery or interstitial laser photocoagulation are available. Imaging procedures plays a key role in PEI, as they provide a reliable assessment of the therapeutic effect of the procedur
Virtual endoscopy of the middle and inner ear with spiral computed tomography. Neri E, Caramella D, Battolla L, Cosottini M, Scasso CA, Bruschini P, Pingitore R, Bartolozzi C
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IL CAMPANILE VITTONIANO DELL’ANTICA CASA COMUNALE A MONTANARO (To): STUDI PER UNA STORIA DELLA SUA COSTRUZIONE
Full text linkPERCUTANEOUS BIOPSY OF LIVER-TUMORS WITH COLOR DOPPLER US GUIDANCE
No full textBackground: Percutaneous liver biopsy is a well-established procedure. Aim of this study was to investigate the usefulness of color Doppler ultrasound (US) for guiding percutaneous biopsy of liver tumors in patients at high risk of bleeding. Methods: Forty-seven patients with severe, uncorrectable coagulopathy (platelet count <50 x 10(9)/L and/or prothrombin time ratio [normal/patient] <50%) were submitted to percutaneous biopsy of focal Liver lesions using a 21 G cutting needle. The procedure was guided by color Doppler US, avoiding the needle cross into any liver or tumor vessel. Results: Biopsy material was adequate for pathological reading in 46/47 cases (97.9%). No major post-biopsy complication was observed. In particular, no case of hemoperitoneum was detected on US examinations performed 2 hours after biopsy. Minor complications (including one subcapsular hematoma) occurred in 4 patients (8.5%). Conclusions: Color Doppler US can safely guide percutaneous liver biopsy in patients at high-risk of bleeding
HEPATOCELLULAR-CARCINOMA - USE OF COLOR DOPPLER US TO EVALUATE RESPONSE TO TREATMENT WITH PERCUTANEOUS ETHANOL INJECTION
No full textPURPOSE: To determine the usefulness of color Doppler ultrasound (US) in the evaluation of the response of hepatocellular carcinoma (HCC) to percutaneous ethanol injection (PEI). MATERIALS AND METHODS: Forty-one patients with 48 lesions 2-5 cm in diameter underwent color Doppler US before and after PEI. Computed tomography (CT), magnetic resonance (MR) imaging, and percutaneous biopsy were also performed to help establish the outcome of therapy. RESULTS: Before treatment, color signals with an arterial Doppler spectrum were seen in 44 of 48 lesions with a frequency shift of 0.51-4.11 kHz (mean, 1.65 kHz). After PEI, 37 of these lesions showed no color signal and were found to be necrotic at CT, MR imaging, and biopsy. In six of seven lesions containing residual tumor, pulsatile flow was still identified, although the frequency shift was significantly decreased (P = .01). CONCLUSION: Color Doppler US proved useful in the assessment of the therapeutic effect of PEI on HCC
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