Search results
Results from the WOW.Com Content Network
They include gadolinium and manganese chelates, or iron salts for T 1 signal enhancement. SPIO, barium sulfate , air and clay have been used to lower T 2 signal. Natural products with high manganese concentration such as blueberry and green tea can also be used for T 1 increasing contrast enhancement.
Delayed Gadolinium-enhanced MR Imaging of Articular Cartilage: Three-dimensional T1 Mapping with Variable Flip Angles and B1 Correction; Toward Imaging Biomarkers for Glycosaminoglycans; Longitudinal Evaluation of Cartilage Composition of Matrix-Associated Autologous Chondrocyte Transplants with 3-T Delayed Gadolinium-Enhanced MRI of Cartilage
In contrast-enhanced CT images, large GISTs appear as heterogeneous masses due to areas of living tumor cells surrounding bleeding, necrosis or cysts, which is radiographically seen as a peripheral enhancement pattern with a low attenuation center. [19] In MRI studies, the degree of necrosis and bleeding affects the signal intensity pattern ...
Gadopentetic acid, sold under the brand name Magnevist, is a gadolinium-based MRI contrast agent. [2]It is usually administered as a salt of a complex of gadolinium with DTPA (diethylenetriaminepentacetate) with the chemical formula A 2 [Gd(DTPA)(H 2 O)]; when cation A is the protonated form of the amino sugar meglumine the salt goes under the name "gadopentetate dimeglumine".
Gadolinium isotopes have 10 metastable isomers, with the most stable being 143m Gd (t 1/2 = 110 seconds), 145m Gd (t 1/2 = 85 seconds) and 141m Gd (t 1/2 = 24.5 seconds). The primary decay mode at atomic weights lower than the most abundant stable isotope, 158 Gd, is electron capture , and the primary mode at higher atomic weights is beta decay .
Gadolinium salts are of primary interest for relaxation agents in magnetic resonance imaging . This technique exploits the fact that Gd 3+ has an electronic configuration of f 7 . Seven is the largest number of unpaired electron spins possible for an atom, so Gd 3+ is a key component in the design of highly paramagnetic complexes. [ 6 ]
Gadolinium acetylacetonate is a coordination compound with the formula Gd(C 5 H 7 O 2) 3. This anhydrous acetylacetonate complex is widely discussed but unlikely to exist per se. The 8-coordinated dihydrate Gd(C 5 H 7 O 2 ) 3 (H 2 O) 2 is a more plausible formula based on the behavior of other lathanide complexes.
The decahydrate of gadolinium oxalate thermally decomposes to obtain the anhydrous form, which can then be heated to produce gadolinium oxide. [2] Gadolinium oxalate reacts with hydrochloric acid to produce Gd(C 2 O 4)Cl. [3] It also reacts with sodium hydroxide under hydrothermal conditions to produce gadolinium hydroxide. [1]