1,721,117 research outputs found
Imaging non invasivo del sistema arterioso coronarico ed extra-coronarico in un unico esame; tecnica ed applicazione clinica della Angiografia con TC Whole-Body
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Multidetector-Row CT Angiography of Peripheral Arteries: Imaging Upper and Lower Extremity Vascular Disease
No full textMultidetector-row CT has dramatically improved the results of computed tomography in all clinical applications, but its beneficial impact has been most striking in vascular imaging. The simplicity of acquisition and the wide availability of equipment make this modality especially suitable for routine clinical application. In this book the basic aspects of multidetector-row CT angiography are comprehensively reviewed. Individual chapters are included on technical principles, image processing techniques and contrast agent administration. All clinical applications are then discussed in depth, with lucid descriptions of the examination technique for particular clinical indications and of the findings that characterize specific diseases. Limitations and advantages in comparison with other imaging modalities are considered. A large number of high-quality black and white and color illustrations help to explain the clinical findings
MRI of adhesive capsulitis of the shoulder: Distension of the bursa in the superior subscapularis recess is a suggestive sign of the pathology
No full textObjective: To evaluate the diagnostic values of the superior subscapularis recess sign in patients with shoulder adhesive capsulitis. The sign consists in evaluating in MRI of the shoulder the presence of fluid distension of the bursa in the superior subscapularis recess. Materials and methods: We evaluated MRI of 165 shoulders in 48 consecutive patients with a diagnosis of shoulder adhesive capsulitis in the freezing phase (group I), in 49 short-wide superior cuff tear (group II) and in 65 controls (group III) between 2010 and 2013. On the T2 weighted images, we evaluated the presence of an high intensity signal within the superior subscapularis recess, consistent with fluid distension of the bursa. Results: The sign was found in 43/48 patients (89.58%) with shoulder adhesive capsulitis in 3/49 (6.12%) patients with superior cuff tear and in 1/65 controls (1.53%) (p < 0.001). The mean diagnostic values were: sensibility 0.91; specificity 0.96-0.98; positive predictive value 0.93-0.97; negative predictive value 0.92-0.94; likelihood ratios for an abnormal test result 15.16-60.6; likelihood ratios for a normal test result 0.086-0.095. Conclusion: For the orthopedic surgeon or the clinician, the sign is useful to confirm in MRI the clinical diagnosis of shoulder adhesive capsulitis; accordingly, the radiologist should describe and relate this sign to the pathology in the report, looking eventually for further typical sign of shoulder adhesive capsulitis. (C) 2013 Elsevier Ireland Ltd. All rights reserved
Imaging cardiovascolare TC e RM: Dalla tecnica all'interpretazione clinica
No full textLa disponibilità e la diffusione di tecnologie performanti ha determinato l'affermarsi degli studi angio-TC ed angio-RM come tecniche semplici ed affidabili per la caratterizzazione ed il planning terapeutico delle principali patologie del sistema cardiocircolatorio, la cui conoscenza è divenuta ormai obbligatoria per tutti i radiologi. Lo scopo di questo testo è di fornire indicazioni tecniche in forma sintetica, ma quanto più possibile completa, relativamente ai principi tecnici ed alla metodologia d'esame per studi angio-TC ed angio-RM di alta qualità negli scenari clinici più vari, presentando allo stesso tempo un'ampia casistica di supporto, ricca di spunti interpretativi e di suggerimenti pratici per la valutazione e la refertazione degli esami. Lo scopo del testo sarà anche di dimostrare i vantaggi ed i limiti delle due metodiche a confronto nelle diverse patologie e nei diversi distretti vascolari, in modo da fornire indicazioni al radiologo esperto ed a quello in formazione
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
L’angio-TC dell’aorta
No full textIl recente sviluppo tecnologico degli scanner TC e dei sistemi di visualizzazione delle immagini ha consentito un imponente ingresso della tecnica di angio-TC nella pratica clinico-diagnostica, conferendole un ruolo di primo piano sia nello studio in elezione che in situazioni di urgenza/emergenza, grazie ad immagini di qualità ottimale e di facile interpretazione. Il presente volume intende offrire un’introduzione alle tecniche di imaging vascolare con la massima semplicità e praticità possibili, cercando di riportare in maniera esaustiva le basi della tecnica d’esame, le principali patologie riscontrabili nella pratica clinica e i quadri normali e patologici da riconoscere nello studio post-operatorio. L’angio TC della’aorta si propone quindi come utile strumento di aggiornamento per tutte le figure professionali diversamente coinvolte nella diagnosi e nella gestione delle patologie aortiche: dal radiologo, al chirurgo, al tecnico di radiologia
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