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By Altun, Ersan; El-Azzazi, Mohamed; Semelka, Richard C
"This e-book offers a pragmatic procedure for imaging of focal and diffuse liver lesions according to cutting-edge MR and CT imaging sequences, multidetector row CT pictures, 3D reformatted pictures, breath-hold MRI sequences, and state of the art MR 3T photographs the place applicable, concise yet precious determine legends, appropriate and systematic (differential) diagnostic info, the most recent references to fundamental literature and �Read more...
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Extra resources for Liver imaging : MRI with CT correlation
Example text
However, these lesions (arrow, b) usually enhance less than the remaining liver parenchyma on the hepatic venous or interstitial phases (b). 28 Patent and thrombosed portal vein. The right portal vein (a) is patent and the left portal vein (arrow, b) is thrombosed. The left portal vein thrombus is bland because of the absence of enhancement in the thrombus. Additionally, increased transient enhancement of the left lobe becomes isointense with the remaining liver parenchyma on the hepatic venous phase.
Interstitial phase This phase should be acquired following the early hepatic venous phase and is customarily referred to as equilibrium phase. However, it should be referred to as interstitial phase more correctly, as there is no true equilibrium that occurs and the contrast is distributed into the interstitial space. Hepatic venous phase or interstitial phase is acquired 90 s–5 min following initiation of contrast injection.
Near isovascularity is most readily appreciated when lesions are poorly seen on postgadolinium images but well seen on precontrast images. Liver metastases from primaries of colon, thyroid, and endometrium may show this type of enhancement pattern. The most common setting is postchemotherapy, although this may also be observed in untreated patients. Fortunately, many of these tumors are moderately low signal intensity on T1-weighted images, rendering them readily apparent, and on occasion they may also be moderately high signal intensity on T2-weighted images.