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.

Breathing issues, language barriers swell MRI scan times

MRI technologists serving patients who have difficulty understanding English may need to budget additional scanner time—especially when image quality largely depends on patients’ compliance with breathing instructions.

COVID-19 medical imaging examples of various clinical presentations. SARS-CoV-2 clinical imaging presentations.

PHOTO GALLERY: What does COVID-19 look like on medical imaging?

This image gallery shows what the various clinical presentations associated with the COVID-19 virus that have been documented during the coronavirus pandemic.

Portable MRI found handy, useful—just not as a full-on replacement for its immovable cousin

Point-of-care MRI is a worthwhile diagnostic option for emergency departments and ICUs concerned about wait or transport times to access fixed MRI for patients with neuroimaging needs.

Early PT for low back pain wards off advanced imaging, other pricey sources of healthcare spending

Patients who receive physical therapy for low back pain within two weeks of symptom onset pay significantly smaller healthcare bills at the 30-day and one-year marks than patients who wait longer for PT or never receive it. 

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For prostate cancer diagnostics, 7T MRI has next to nothing on ultrasound tomography

In an initial comparison study involving 10 patients with high-risk prostate cancer, ultrasound tomography (UT) soundly beat 7-Tesla multiparametric MRI on detection sensitivity, 85.7% to 65.3%.

Radiology, meet ‘3D-based superconducting radiofrequency computers’

What do you get when you combine MRI with quantum computing? The world will soon find out.

Technologist ‘learning opportunities’ vastly outnumber imaging ‘do-overs’ across almost 1 million exams

Reviewing a 20-month run with a radiologist-to-technologist communications tool, researchers have found minor problems with image quality 10 times more common than patient callbacks for repeat imaging.

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Imaging-based COVID study finds blood clots twice as likely with infection vs. vaccination

A retrospective analysis of cross-sectional venograms shows only 4.5% of a teaching hospital’s COVID-vaccinated patients had a clotting condition in early 2021. Meanwhile the rate for the unvaccinated was 10.1%.

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.

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