钆特醇 (Prohance)

概览

Gadoteridol is a medication used to improve the contrast of MRI scans for better visualization.

作用机制

Based on the behavior of protons when placed in a strong magnetic field, which is interpreted and transformed into images by magnetic resonance (MR) instruments. Paramagnetic agents have unpaired electrons that generate a magnetic field about 700 times larger than the proton's field, thus disturbing the proton's local magnetic field. When the local magnetic field around a proton is disturbed its relaxation process is altered. MR images are based on proton density and proton relaxation dynamics. MR instruments can record two different relaxation processes, the T1 (spin-lattice or longitudinal relaxation time) and T2 (spin-spin or transverse relaxation time). In MRI, visualization of normal and pathological brain tissue depends in part on variations in the radiofrequency signal intensity that occur with changes in proton density, alteration of the T1, and variation in T2. When placed in a magnetic field, gadoteridol shortens the T1 relaxation time in tissues where it accumulates. Gadoteridol does not cross the intact blood-brain barrier; therefore, it does not accumulate in normal brain tissue or in central nervous system (CNS) lesions that have not caused an abnormal blood-brain barrier (e.g., cysts, mature post-operative scars). Abnormal vascularity or disruption of the blood-brain barrier allows accumulation of gadoteridol in lesions such as neoplasms, abscesses, and subacute infarcts.

适应症

Gadoteridol is indicated for use with magnetic resonance imaging (MRI) in order to visualize lesions with disrupted blood-brain barrier and/or abnormal vascularity in the brain, spine, and associated tissues in adult and pediatric patients, including term neonates. It is also indicated for visualization of lesions in the head and neck in adult patients.

• Central nervous system lesion
• Lesions of the Head and Neck