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.
-->
Subscribe to:
Post Comments (Atom)
Popular Posts
-
Magnetic resonance imaging (MRI) cisternography depends on heavily T2-weighted sequences with fat suppression. CSF appears as a bright s...
-
3-PLANE LOC AXIAL T1 AXIAL T2 FS CORONAL T1 CORONAL STIR Axial T2 high resolution FIESTA ( Facial Nerves in IAC for any space occu...
-
Regional Saturation Bands Regional saturation employs a 90° RF pulse which, when combined with a gradient orthogonal to the imaging p...
-
--> Indications : evaluating for meniscal retears in a postoperative knee. Sequences Knee MR arthrogram MRI Protocol : ...
-
Normal MRI Anatomy The pectoralis tendon is best seen on axial T1 and T2-weighted images as a curvilinear low-signal band inserting o...
-
SOURCE: http://imageradiology.blogspot.com/2012/06/3d-mrcp-pancreas.html The 3D TSE sequence can produce high-spatial-resolution MRCP...
-
Because MR neurography sequences are relatively lengthy and motion sensitive, it is not generally feasible to screen the whole extremity ...
-
The sternum and sternoclavicular joints are difficult to evaluate with plain radiographs. The value of CT in assessing lesions of the...
-
Prostrate MRI Appearence T1‐weighted MR images, the normal prostate gland demonstrates homogeneous intermediate to‐ low signal inten...
-
T-spine mri protocol without contrast T2 Sagittal FSE T1 Sagittal SE T2 Sagitta STIR T2 Axial FSE T1 Axial SE POST CONTRAS...
No comments:
Post a Comment