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
-
--> Patients are positioned in the supine or left decubitus position. Claustrophobic reactions have not been observed to a higher...
-
Normal and a rupture Achilles tendon MRI images Achilles tendon MRI image-yellow arrow Green-normal Achilles tendon MRI image ...
-
Axial Plane: Prescribe plane perpendicular to midshaft of the proximal phalanx of the thumb. Scan from 1st carp-metacarpal joint th...
-
Prescribing sagittal images. Images are obtained no more than 10° oblique to a perpendicular to a line connecting the ... -
--> Routine shoulder protocols are the most variable, but most include SHOULDER MRI SEQUENCES ... -
ANKLE AXIAL IMAGING PLANE Axial ankle mri planning/referrence plane is parallel to axis of calcaneus. Technical notes: Scan ankle f... -
SAGITAL ORBIT MRI PLANNING REFERRAL LINES AXIAL ORBIT MRI PLANNING REFERRAL LINES CORONAL ORBIT MRI PLANNING REFERRAL ... -
Normal MRI Anatomy The pectoralis tendon is best seen on axial T1 and T2-weighted images as a curvilinear low-signal band inserting o...
-
High Resolution Brainstem Imaging CISS (Constructive Interference Steady State) CISS is a strongly T2 weighted GRE sequence. In essen...
No comments:
Post a Comment