Biomedical subjects

R Pozzi-Mucelli

Publications and source records attributed to R Pozzi-Mucelli.

23 records · Page 2Linked to original sources

PubMed1980

[Angiography in the evaluation of pancreatic carcinoma after the introduction of echotomography (author's transl)].

The authors refer the results of angiography in 46 patients with proven pancreatic carcinoma. Based on the prospective report there were 40 correct diagnoses, giving an overall accuracy of 86.95%. The incidence of the angiographic features has been investigated; basing on these findings the possibility of a radical surgery was suggested. 24 of these patients have undergone echotomography. The authors compare the results of the two investigations, concluding that these are complementary in diagnosis and prediction of resectability (invasion of great vessels, secondary deposits to the liver). Echotomography allows to recognize a large number of small dimension carcinomas, suggesting its use in the screening of those patients with suspected pancreatic neoplasm. Angiography is still essential to perform radical surgery.

Angiography↗

PubMed1980

[The biphasic contrast method in the stomach examination. A comparative study with standard method and correlations with endoscopy (author's transl)].

A two years-experience, using the biphasic contrast method in the evaluation of the stomach, is reported. Endoscopic and radiological results are compared. Our previous reports with standard contrast method are also reviewed. Ulcerative and neoplastic pathologies were studied and classified as proposed in the "trial policentrico multidisciplinare paritetico". The double contrast method has greatly increased the accuracy of X-ray diagnosis, considerably reducing the difference with endoscopy.

Contrast Media↗

PubMedDate not supplied

New automatic software for virtual colonoscopy: technical aspects.

PURPOSE: To evaluate a new virtual endoscopy software package capable of automatically plotting the path along which to perform endoscopic exploration. MATERIALS AND METHODS: We reviewed the examinations of 50 patients with colonic neoplasms studied by CT colonoscopy by using a single-detector CT scanner (Philips Tomoscan AVE1). The technical parameters used were: slice thickness 3 mm, pitch 1.4, reconstruction interval 2-2.5, 120 kV, 150-200 mA. The images were processed on a separate workstation (Philips Easy Vision 5.1) running an experimental virtual endoscopy software package capable of automatically drawing a line along which to move the virtual endoscope to explore the colon. Reconstruction of the endoscopic images along the path obtained was set at an interval of 15-20 mm between one endoscopic view and the next, to a total of 70 to 120 images. The endoscopic animated image sequence was then saved and evaluated by comparing the starting axial images and the three-dimensional images obtained. RESULTS: The programme plotted the endoscopic path correctly in a single pass in 40 of the 50 cases studied. The overall time spent by the radiologist on image-processing did not exceed 5 minutes. DISCUSSION: The need to reduce the time spent by audiologists on post-processing has led to a gradual improvement in image-processing hardware and software. In the context of virtual endoscopy, one of the main goals is to obtain the path for endoscopic exploration in as short a time as possible. The programme we evaluated successfully fulfils this requirement as, once the image-processing technical parameters have been defined, it plots a path along the entire colon and performs the reconstruction procedures automatically. The time spent by the operator on post-processing does not exceed 5 minutes. CONCLUSIONS: The new programme evaluated in this study facilitates the processing of endoscopic images, reduces radiologist time and may contribute to the widespread use of virtual colonoscopy.

Colonic Neoplasms↗

PubMedDate not supplied

[Comparative evaluation of echography, computerized tomography and magnetic resonance imaging in the diagnosis of hepatocellular carcinoma in cirrhotic patients].

The contribution of US, CT, and MR imaging was investigated in 25 cirrhotic patients with hepatocellular carcinoma. The following parameters were considered: lesion detection, site and size of the lesion, daughter nodules, location and/or infiltration of intrahepatic vessels, patency of portal vein and collateral vessels, signs of chronic liver disease, steatosis, ascitis, and lymphadenopathy. Our results confirm the value of US, which also allowed lesion biopsy in all cases. CT was as accurate as US in detecting the lesion and even superior in demonstrating daughter nodules. MR imaging, with conventional SE and IR sequences, was inferior since it missed 3 lesions due to motion artifacts; moreover, a smaller number of daughter nodules was seen than with CT. The authors conclude that, at present, MR imaging cannot replace US and CT; the latter, if combined with arteriography, using either hydrosoluble or liposoluble contrast agents, gives the best results in the detection of small hepatocellular carcinomas, and especially of daughter nodules which are important factors for planning appropriate therapy.

Carcinoma, Hepatocellular↗

PubMedDate not supplied

[Echography and computerized tomography in the diagnosis of complex abdominal lesions].

Complex abdominal lesions include a variety of pathologies, such as septated, infected, and hemorrhagic cysts, abscesses, tumors, and fluid collections of different etiology. These lesions present diagnostic difficulties with both Ultrasonography (US) and Computed Tomography (CT), since findings may not be present or, when present, are not specific. Keeping these limitations in mind, we evaluated 105 patients (111 abdominal lesions) with both US and CT in order to compare their adequacy in predicting the nature of the lesion. On the basis of US and CT results, complex abdominal lesions were divided in four classes: class I includes 43 cases in which both examinations gave the same contribution to the definition of the nature of the lesion, class II (14 lesions, mainly sepimentated cysts), in which US was superior to CT, class III includes 45 cases in which CT was superior to US, mainly in case of hemorrhagic cysts, abscesses, fluid collections and, less frequently, cystic tumors; class IV includes 9 cases in which US and CT results were complementary, which allowed the nature of the lesion to be defined. In conclusion, US and CT enable the identification and the characterization of complex abdominal lesions; an association of the two investigations enhances their diagnostic value. As a rule, CT is superior when the content of the lesion is either gas or hemorrhage, and in the definition of its peripheral wall. US is always superior in assessing septa, and sometimes even vegetations.

Abdomen↗