Advanced Imaging Modalities by Steffen Rickes, P Malfertheiner

By Steffen Rickes, P Malfertheiner

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Fibrous capsule is observed as a hyperintensity area surrounding the tumor during the portal venous and the equilibrium phase images (arrowheads). 3/90) (e) and hyperintensity on T2-weighted MRI (FSE, 8000/89) (f). 7/60) (g), the tumor is visualized as area with a higher signal than the surrounding liver parenchyma due to decreased uptake of SPIO in the tumor. CT Scan and MRI in the Differentiation of Liver Tumors Dig Dis 2004;22:39–55 43 Fig. 3. HCC and dysplastic nodule with a malignant focus in a 70-year-old man.

The early arterial phase imaging should be performed during maximal arterial enhancement. CT hepatic angiographic images can be made using those images [12]. The late arterial phase imaging should be done during a phase of maximal enhancement of hypervascular tumors without significant hepatic parenchymal enhancement. The interval between the onset of the early arterial phase and that of the late arterial phase is about 10–15 s. The late arterial phase images usually show better detection sensitivity for hypervascular liver tumors than the early arterial phase images [10].

Br J Surg 1999;86:189–193. 25 Legmann P, Vignaux O, Dousset B, Baraza AJ, Palazzo L, Dumontier I, Coste J, Louvel A, Roseau G, Couturier D, Bonnin A: Pancreatic tumors: comparison of dual-phase helical CT and endoscopic sonography. AJR Am J Roentgenol 1998;170:1315–1322. 26 Rösch T, Braig C, Gain T, Feuerbach S, Siewert JR, Schusdziarra V, Classen M: Staging of pancreatic and ampullary carcinoma by endoscopic ultrasonography. Comparison with conventional sonography, computed tomography, and angiography.

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