1,720,964 research outputs found
Diagnostic accuracy of MRCP in choledocholithiasis
No full textPURPOSE: To evaluate the accuracy of MRCP in diagnosing choledocholithiasis considering Endoscopic Retrograde Cholangiopancreatography (ERCP) as the gold standard. To compare the results achieved during the first two years of use (1999-2000) of Magnetic Resonance Cholangiopancreatography (MRCP) in patients with suspected choledocholithiasis with those achieved during the following two years (2001-2002) in order to establish the repeatability and objectivity of MRCP results. MATERIALS AND METHODS: One hundred and seventy consecutive patients underwent MRCP followed by ERCP within 72 h. In 22/170 (13%) patients ERCP was unsuccessful for different reasons. MRCP was performed using a 1.5 T magnet with both multi-slice HASTE sequences and thick-slice projection technique. Choledocholithiasis was diagnosed in the presence of signal void images in the dependent portion of the duct surrounded by hyperintense bile and detected at least in two projections. The MRCP results, read independently from the ERCP results, were compared in two different and subsequent periods. RESULTS: ERCP confirmed choledocholithiasis in 87 patients. In these cases the results of MRCP were the following: 78 true positives, 53 true negatives, 7 false positives, and 9 false negatives. The sensitivity, specificity and accuracy were 90%, 88% and 89% respectively. After the exclusion of stones with diameters smaller than 6 mm, the sensitivity, specificity and accuracy were 100%, 99% and 99%, respectively. MRCP accuracy was related to the size of the stones. There was no significant statistical difference between the results obtained in the first two-year period and those obtained in the second period. CONCLUSIONS: MRCP is sufficiently accurate to replace ERCP in patients with suspected choledocholithiasis. The results are related to the size of stones. The use of well-defined radiological signs allows good diagnostic accuracy independent of the learning curve
Tecnologia TCMS e mezzi di contrasto
No full textla TC ha fatto passi enormi nella sua evoluzione da TC convenzionale a TC spirale e a TC multistrato. Quest’ultima tecnologia ha ulteriormente cambiato le regole e rinnovato, ancora una volta, il modo di operare in questo campo della Radiodiagnostica [...]. In ogni capitolo viene dato spazio agli aspetti di anatomia e tecnica di esame e alle varie patologie indagabili con TC. L’iconografia trova particolare spazio nel testo ed è stata concepita in modo da far risaltare le possibilità delle attuali TC multistrato, con ampio ricorso alle immagini di ricostruzione multiplanare e tridimensionale, oltre che assiale, non per un fine iconografico, ma per far risaltare il cambiamento nella visualizzazione e nell’interpretazione che si è verificato con la TC multistrato
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Recurrent uterine cancer after surgery: magnetic resonance imaging patterns and their changes after concomitant chemoradiation
No full textPURPOSE:
Our primary objective was to describe the magnetic resonance (MR) imaging patterns of recurrent uterine cancer after surgery and their changes following concurrent chemoradiation. The secondary objective was to identify MR imaging predictors of outcome.
MATERIALS AND METHODS:
Twenty-two consecutive women with biopsy-proven recurrent uterine cancer after surgery (cervix 13 patients, endometrium nine patients) were enrolled in this prospective study. Inclusion criteria were MR imaging at diagnosis and during follow-up and eligibility for concurrent chemoradiation. MR images were assessed for signal intensity of the pelvic relapse on T2-weighted images, site of relapse and infiltration of adjacent organs. Pre- and posttreatment MR images were compared on the basis of the same criteria. The 3D volume of relapses after treatment was calculated, and tumour response to treatment was evaluated as complete, partial, no change or disease progression.
RESULTS:
Recurrences appeared hyperintense on T2-weighted images in 22/22 (100%) patients. Pelvic relapse site was vagina in 5/22 (23%), vaginal vault in 9/22 (41%), vaginal vault with extension to the pelvic wall in 5/22 (23%) and pelvic wall in 3/22 (13%). Infiltration of adjacent organs was detected in 9/22 (41%) patients. The mean volume of recurrences on pretreatment MR images was 38.83 cm(3). On posttreatment MR images, relapses appeared hypointense in 19/22 (86%) patients and hyperintense in 3/22 (14%). The mean volume of recurrences on posttreatment MR images was 18.01 cm(3). Complete response was seen in 11/22 (50%) patients, partial response in 8/22 (36%) and no change in 3/22 (14%).
CONCLUSIONS:
MR imaging can provide an evaluation of all parameters necessary for planning treatment and assessing response to treatment
Imaging of IPMT [Imaging dei tumori papillari intraduttali muco-secernenti del pancreas]
No full textWe describe radiological characteristics of intraductal papillary mucinous tumor (IPMT) of the pancreas, giving a classification of IPMT based on imaging findings at Ultrasound, Computed Tomography, Magnetic Resonance and Cholangiopancreatography with Magnetic Resonance. Different from the first IPMT classification, based on anatomical correlation, we propose a classification based on anatomical, clinical and radiological findings, that describes focal or diffuse main duct IPMT, combined IPMT and unifocal or multifocal side branch IPMT
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Tumori intraduttali papillari mucino-secernenti (TIPM) del dotto pancreatico principale: ruolo della RM nella caratterizzazione delle lesioni, a confronto con l'isto-patologia
No full textMain Pancreatic Duct Intraductal Papillary mucinous Tumors (IPMT): Accurancy of MR Imaging in Predicting Clinical Behavior, Comapred to Histopathology
No full textRuolo della RM nella valutazione delle neoplasie della cervice uterina localmente avanzate dopo trattamento neo-adiuvante
No full text- …
