Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is the gold standard imaging modality for soft tissues. It produces detail cross-sectional images of soft tissue and bone anatomy, including muscles, tendons, ligaments, brain and organs, without the use of ionizing radiation. In addition to orthopedic imaging, MRI is also used for heart, brain and breast. MRI uses gadolinium contrast in many exams to highlight tissues and blood vessels, which enhances images and offers better diagnostic quality. It can also be used in conjunction with PET scans. How does MRI work? MR creates images by using powerful magnets to polarize hydrogen atoms in water (the body is made of of more than 80% water) so they face in one direction. A radiofrequency pulse is then used to ping these atoms, causing them to wobble, or resonate. The MRI coils detect this and computers can assemble images from the signals. Basic MRI scans will focus on the resonance of fat and water in two different sequences, which highlight and contrast different features in the anatomy.

Friendly reminder: MRI is really cool

Radiologists already know this all too well: MRI is cool. You use the technology to give physicians a glimpse inside the human body without ever having to cut it open. 

Patients with pacemakers and cardiac defibrillators undergoing I.5-T MRI exams: Is it safe?

More than three million individuals in the U.S. live with cardiac implantable electronic devices (CIEDs) such as pacemakers and implantable cardioverter-defibrillators (ICDs). But what happens when one of them need an MRI? Is it safe? 

Radiologist or mind reader? MRI spots emotions in human brain

OK, medical imaging hasn't reached a point where it can answer for you when the physician asks, "How are you feeling today?" But researchers at Duke University are able to spot emotions as they flicker across the brain using functional MRI, according to a new study release Sept. 21.

MRI key to distinguishing multiple sclerosis from its many mimics

There is no litmus test for multiple sclerosis (MS). Symptoms for the disease vary, and those that do appear can be nonspecific. Imaging can provide clues about individuals possibly suffering from MS, but a number of other disorders present similar MRI findings.

MRI scans show dogs can understand human—sort of

MRI scans are good for more than just understanding human brains. They can also help us understand the brains of our furry friends and how they might be similar or different to us. 

PET, MRI to help doctor monitor brains of pro fighters

Head trauma is big news in the sports world these days. Degenerative nerve damage from contact sports—most notably chronic traumatic encephalopathy (CTE) in former pro football players—has pushed athlete safety to the forefront of many discussions.

Wisconsin researchers combat obesity with fat-measuring MRI

Researchers from UW-Madison have developed an MRI-based fat quantification method that separately measures brown adipose tissue (BAT) and white adipose tissue (WAT).

Study uses MRI to link breast-feeding, intelligence

The health benefits associated with breast-feeding are many, including lower risk of SIDS, descreased cancer rates and stronger immune systems. A recent study used MRIs to show increased intelligence in premature babies who were breast-fed.

Around the web

The nuclear imaging isotope shortage of molybdenum-99 may be over now that the sidelined reactor is restarting. ASNC's president says PET and new SPECT technologies helped cardiac imaging labs better weather the storm.

CMS has more than doubled the CCTA payment rate from $175 to $357.13. The move, expected to have a significant impact on the utilization of cardiac CT, received immediate praise from imaging specialists.

The all-in-one Omni Legend PET/CT scanner is now being manufactured in a new production facility in Waukesha, Wisconsin.