Magnetic Resonance Imaging (MRI)
MRI creates images from the magnetic resonance created in hydrogen atoms when they are polarized and an electromagnetic pulse is used to knock them off axis. This section includes MR analysis software, MRI scanners, gadolinium contrast agents and related magnetic resonance imaging accessories.
A, Image from noncontrast head CT demonstrates symmetric hypoattenuation within the bilateral medial thalami (arrows). B, Axial CT venogram demonstrates patency of the cerebral venous vasculature, including the internal cerebral veins (arrows). C, Coronal reformat of aCT angiogram demonstrates normal appearance of the basilar artery and proximal posterior cerebral arteries. Image courtesy of the Radiological Society of North America (RSNA)
Summary steps of the processing pipeline for QSM reconstruction (phase pre-processing and map estimation) and whole brain/regional analysis. ANTs, advanced normalisation tools; MP-RAGE, magnetisation-prepared, 3D, rapid, gradient-echo; MSDI, multi-scale dipole inversion; QSM, quantitative susceptibility mapping; ROI, region of interest; SWI, susceptibility weighted imaging.
A: Oblique coronal fat-suppressed T2-weighted MR image shows normal hypointense joint capsule at axillary recess (arrow). Note full-thickness tear of supraspinatus tendon (arrowheads) B: Oblique sagittal proton density MR image shows preserved subcoracoid fat triangle (asterisk). Image courtesy of the American Journal of Roentgenology (AJR)
UT Dallas faculty members who collaborated with Dr. Jeremiah Gassensmith (center, back), associate professor of chemistry and biochemistry, include Dr. Lloyd Lumata (left, back), assistant professor of physics, and Dr. Steven Nielsen, associate professor of chemistry. Chemistry graduate students in Gassensmith’s lab include (from left, front) Oliva Brohlin, Arezoo Shahrivarkevishahi and Laurel Hagge.
This image is of an 80 kg woman with a newly diagnosed IDH-wildtype glioblastoma. The quarter dose image on the left was obtained after the administration of 4 ml of MultiHance. Subsequently, an additional 12 ml of MultiHance was administered and the cumulative full dose image in the center was obtained. The image on the right was rendered following artificial intelligence processing of the 4 ml image using eGad genetic algorithms. This image has the quality of triple dose gadolinium even though only one quarter dose gadolinium was given.