MR Imaging of the Liver
Section snippets
MR imaging techniques and concepts
One of the major challenges of MR imaging in the abdomen has centered on the problem of acquiring data from tissue that has high spatial displacement low-frequency movement, mostly caused by respiratory-dependent movement of the diaphragm. MR imaging of the liver initially relied on standard spin echo T1- and T2-weighted methods, representing sequences that acquire data over a long time window relative to respiratory movement [5], [6], [7]. This requires supplemental techniques of respiratory
Liver tumor detection and characterization
Table 1 summarizes a pattern recognition approach to liver tumors, applying concepts described previously. Various comparisons of contrast-enhanced CT and MR imaging have been performed showing that MR imaging has significantly better capacity to characterize liver lesions. A study of 89 patients with liver lesions, confirmed by surgical assessment, percutaneous biopsy, or long-term follow-up, showed that more lesions could be detected on MR imaging in 49% of patients, and that in 25% of these
MR imaging of diffuse liver diseases
It is the objective of all cross-sectional imaging techniques to have the ability to evaluate the anatomic configuration of normal and abnormal tissues. In addition, it has become increasingly evident that MR imaging can demonstrate normal and pathologic processes that represent tissue cellular and intracellular architecture, and intracellular processes. Using intravenously injected contrast agent can further provide information regarding the vessels perfusing normal and abnormal tissues, in
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2017, Introduction to Cancer MetastasisLiver specific magnetic resonance imaging contrast medium for evaluation of focal liver lesions - initial experience at a service hospital
2012, Medical Journal Armed Forces IndiaCitation Excerpt :The role of MRI is today changing from a limited problem-solver technique to being a first-line hepatic imaging modality.5,6 Using faster imaging sequences and improved software algorithms, anatomic detail and lesion-to-liver contrast can be optimized by dynamic studies facilitating better detection and characterization of liver lesions than USG/CECT.7 Liver specific MR contrast media take advantage of the affinity of certain compounds to concentrate in hepatocytes or Kupffer cells.
Biliary, Pancreatic, and Hepatic Imaging for the General Surgeon
2011, Surgical Clinics of North AmericaCitation Excerpt :However, a significant minority of HCC tumors are hypovascular without significant arterial enhancement (Fig. 27).102,173 In this regard, MRI is advantageous in allowing further tissue differentiation based on different pulse sequences, with increased signal being noted on T2-weighted images in more than 90% of HCC cases in contrast with the eqo- or hypointensity seen with regenerative or dysplastic nodules (Fig. 28).102,103,173,177 The sensitivity of MRI is 100% for HCC larger than 2 cm and 89% for those 1 to 2 cm, but decreases to 34% sensitivity for tumors of less than 1 cm, as documented on explant studies.103,188
A pictorial review of the MRI appearances of focal liver lesions
2010, Journal of Medical Imaging and Radiation SciencesNonivasive Gastrointestinal Imaging: Ultrasound, Computed Tomography, Magnetic Resonance Imaging
2010, GI/Liver Secrets Plus: Fourth Edition