Diffusible tracers pass the blood-brain-barrier and are taken up by the brain parenchyma. The concentration of the tracer in the brain parenchyma is therefore correlated with the amount of blood flow to the brain parenchyma. With knowledge of the tracer concentration in the arterial blood supply, absolute CBF values can be calculated. Perfusion imaging techniques that use diffusible tracers include Xenon-CT, Single Photon Emission CT (SPECT) and positron emission tomography (PET). PET is generally viewed as the gold-standard perfusion imaging technique, but it is used little in clinical practice due to its high cost, limited availability, and the poor resolution of PET perfusion images.
-->
Popular Posts
-
Normal MRI Anatomy The pectoralis tendon is best seen on axial T1 and T2-weighted images as a curvilinear low-signal band inserting o...
-
Axial Plane: Prescribe plane perpendicular to midshaft of the proximal phalanx of the thumb. Scan from 1st carp-metacarpal joint th...
-
Regional Saturation Bands Regional saturation employs a 90° RF pulse which, when combined with a gradient orthogonal to the imaging p...
-
--> Routine shoulder protocols are the most variable, but most include SHOULDER MRI SEQUENCES ... -
FLUID-ATTENUATED INVERSION RECOVERY FLAIR is a T2-weighted sequence in which the CSF signal is suppressed. On traditional T2-weighted MRI...
-
The section thickness should vary depending on the anatomic sites and clinical setting. Image resolution can be increased with zero inte...
No comments:
Post a Comment