Editing Magnetic resonance imaging (section)

==== Liver and gastrointestinal ====
[[Hepatobiliary system|Hepatobiliary]] MR is used to detect and characterize lesions of the [[liver]], [[pancreas]], and [[bile duct]]s. Focal or diffuse disorders of the liver may be evaluated using [[Diffusion MRI|diffusion-weighted]], opposed-phase imaging and [[Dynamic Contrast Enhanced MRI|dynamic contrast enhancement]] sequences. Extracellular contrast agents are used widely in liver MRI, and newer hepatobiliary contrast agents also provide the opportunity to perform functional biliary imaging. Anatomical imaging of the bile ducts is achieved by using a heavily T2-weighted sequence in [[Magnetic resonance cholangiopancreatography|magnetic resonance cholangiopancreatography (MRCP)]]. Functional imaging of the pancreas is performed following administration of [[secretin]]. MR enterography provides non-invasive assessment of inflammatory bowel disease and small bowel tumors. MR-colonography may play a role in the detection of large polyps in patients at increased risk of colorectal cancer.<ref name="FrydrychowiczLubner2012">{{cite journal | vauthors = Frydrychowicz A, Lubner MG, Brown JJ, Merkle EM, Nagle SK, Rofsky NM, Reeder SB | title = Hepatobiliary MR imaging with gadolinium-based contrast agents | journal = Journal of Magnetic Resonance Imaging | volume = 35 | issue = 3 | pages = 492–511 | date = March 2012 | pmid = 22334493 | pmc = 3281562 | doi = 10.1002/jmri.22833 }}</ref><ref name="SandrasegaranLin2010">{{cite journal | vauthors = Sandrasegaran K, Lin C, Akisik FM, Tann M | title = State-of-the-art pancreatic MRI | journal = AJR. American Journal of Roentgenology | volume = 195 | issue = 1 | pages = 42–53 | date = July 2010 | pmid = 20566796 | doi = 10.2214/ajr.195.3_supplement.0s42 }}</ref><ref name="MasselliGualdi2012">{{cite journal | vauthors = Masselli G, Gualdi G | title = MR imaging of the small bowel | journal = Radiology | volume = 264 | issue = 2 | pages = 333–48 | date = August 2012 | pmid = 22821694 | doi = 10.1148/radiol.12111658 }}</ref><ref name="ZijtaBipat2009">{{cite journal | vauthors = Zijta FM, Bipat S, Stoker J | title = Magnetic resonance (MR) colonography in the detection of colorectal lesions: a systematic review of prospective studies | journal = European Radiology | volume = 20 | issue = 5 | pages = 1031–46 | date = May 2010 | pmid = 19936754 | pmc = 2850516 | doi = 10.1007/s00330-009-1663-4 }}</ref>