What are T2 signal lesions?
What are T2 signal lesions?
T2 weighted imaging identifies MS lesions as high signal foci against the low signal background of white matter. However, periventricular lesions are often indistinguishable from the adjacent CSF which is also of high signal with T2 weighting.
Can MRI detect abdominal tumors?
MRI may be used in diagnosing abnormal growths. It can distinguish tumors from normal tissues and can provide information for the staging (determination of the size, extent, and spread) of abdominal tumors.
Can fatty liver cause lesions?
Focal lesions may frequently be concurrent with fatty liver, for fatty liver (including non-alcohol fatty liver disease and liver fat infiltration from other causes) is common in the general population [8-10].
What does T1 and T2 hypointense mean?
T1 -hypointense lesions (T1-black holes) in multiple sclerosis (MS) are areas of relatively severe central nervous system (CNS) damage compared with the more non-specific T2-hyperintense lesions, which show greater signal intensity than normal brain on T2-weighted magnetic resonance imaging (MRI).
How are T2 weighted sequences used in magnetic resonance imaging?
T2-weighted sequences are an integral part of magnetic resonance (MR) imaging performed for the characterization of adnexal lesions. A relatively small number of these lesions demonstrate low signal intensity on T2-weighted MR images.
How is T2 weighted imaging used to diagnose adnexal lesions?
On the other hand, visualization of both ovaries as separate and distinct from the lesion confirms that the lesion is extraovarian in origin. Visualization of hyperintense ovarian follicles or of a functional cyst at T2-weighted imaging helps identify the ovaries.
What are the signal characteristics of T2 hypointense lesions?
Signal Characteristics of T2-Hypointense Adnexal Lesions. Tissue characterization at MR imaging is based primarily on differences in longitudinal (T1) and transverse (T2) relaxation times (6). The majority of adnexal lesions contain cystic components and are, therefore, T2 hyperintense.
What causes shortening of T2 weighted imaging time?
However, there are a few distinctive histologic and morphologic entities that result in shortening of T2 relaxation time and hence manifest with low signal intensity at T2-weighted imaging, including blood products, muscle, fibrous tissue, calcification, air or flow-related artifact, and paramagnetic substances such as melanin ( 7 ).
