Keywords: Humans, Magnetic Resonance Angiography, Methods, Predictive Value Of Tests, Pulmonary Embolism, Diagnosis, Diagnostic Imaging, Pathology, Tomography, X-Ray Computed,
Affiliations: Istituto di Scienze Radiologiche, Universita G. D'Annunzio, Chieti, Italy.,
References: Not available.
Pulmonary embolism: the role of computed tomography and magnetic resonance imaging
The technological progress in Computed Tomography (CT) (spiral and electron beam) and Magnetic Resonance Imaging (MRI fast sequences) has stimulated their interest in the diagnosis of acute and chronic pulmonary embolism (PE). They are noninvasive procedures able to identify thrombi up to the level of segmental pulmonary branches. This result, albeit not ideal, is significant, in view of the lower clinical relevance of peripheral emboli as compared to more central locations, especially in the absence of peripheral venous thrombosis. Spiral CT allows satisfactory assessment of pulmonary branches with high sensitivity (65-100%), specificity (89-96%), positive predictive value (95%) and negative predictive value (80-100%) in the diagnosis of PE. MRI with spin-echo sequences has also a satisfactory sensitivity (75-90%), specificity (up to 100%), positive predictive value (86%) and negative predictive value (85%). Recently, MR angiography was shown to be able to depict smaller pulmonary branches (6th and 7th generation), even if its efficacy in the identification of emboli has not been demonstrated as yet. CT and MRI are bound to play an increasingly relevant role in the diagnosis of PE.
Pulmonary embolism: the role of computed tomography and magnetic resonance imaging
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