Items tagged “mri”

715 results found
Article

Bright rim sign (DNET)

The bright rim sign, also known as the hyperintense ring sign, has been described in dysembryoplastic neuroepithelial tumors (DNET). It is described as a well defined rim of high signal around the DNET on FLAIR sequences. This T2/FLAIR hyperintense ring, whether complete or in complete, is fair...
Article

Chemical shift artifact

Chemical shift artifact or misregistration is a type of MRI artifact. It is a common finding on some MRI sequences, and used in MRS. This artifact occurs in the frequency-encoding direction and is due to spatial misregistration of fat and water molecules.  Chemical shift is due to the differenc...
Article

Magic angle effect (MRI artifact)

The magic angle is an MRI artifact which occurs on sequences with a short TE (less than 32ms; T1W sequences, PD sequences and gradient echo sequences).  It is confined to regions of tightly bound collagen at 54.74° from the main magnetic field (B0), and appears hyperintense, thus potentially be...
Article

Nephrogenic systemic fibrosis

Nephrogenic systemic fibrosis (NSF), also known as nephrogenic fibrosing dermopathy, is a complication of gadolinium-based contrast agents used in MRI. It is characterized by "firm, erythematous, and indurated plaques of the skin associated with subcutaneous edema" 1. Eventually, flexure contra...
Article

Phase-encoded motion artifact

Phase-encoded motion artifact is one of many MRI artifacts occurring as a result of tissue/fluid moving during the scan. It manifests as ghosting in the direction of phase-encoding, usually in the direction of the short axis of the image (i.e left to right on axial or coronal brains, and anterio...
Article

Sugar coating

The so-called "sugar coating" or zuckerguss (German for sugar icing) is seen in post-contrast images of the brain and spinal cord in patients with leptomeningeal drop metastases or leptomeningeal carcinomatosis. It is seen both as a result of CNS involvement from distant primaries as well as dir...
Case

Baastrup syndrome

 Diagnosis certain
A.Prof Frank Gaillard
Published 07 May 2008
62% complete
MRI
Case

Chiari I malformation

 Diagnosis certain
A.Prof Frank Gaillard
Published 07 May 2008
68% complete
MRI
Case

Central pontine myelinolysis

 Diagnosis possible
A.Prof Frank Gaillard
Published 07 May 2008
53% complete
MRI
Case

Foraminal lumbar disc protrusion

 Diagnosis certain
A.Prof Frank Gaillard
Published 07 May 2008
74% complete
MRI
Case

Leptomeningeal lymphoma

 Diagnosis certain
A.Prof Frank Gaillard
Published 07 May 2008
74% complete
MRI
Case

Quadriceps tendon rupture

T1WI sagittal
 Diagnosis certain
A.Prof Frank Gaillard
Published 07 May 2008
80% complete
MRI
Case

Orbital cavernous hemangioma

 Diagnosis certain
A.Prof Frank Gaillard
Published 07 May 2008
68% complete
MRI
Case

Papilledema (MRI)

 Diagnosis probable
A.Prof Frank Gaillard
Published 07 May 2008
39% complete
MRI
Case

Phase mismapping

T1WI annotated

W...
 Diagnosis not applicable
A.Prof Frank Gaillard
Published 07 May 2008
42% complete
MRI
Case

Weber syndrome

 Diagnosis almost certain
A.Prof Frank Gaillard
Published 07 May 2008
62% complete
MRI
Article

Anterior cruciate ligament mucoid degeneration

Anterior cruciate ligament (ACL) mucoid degeneration, along with tears and anterior cruciate ligament ganglion cysts, is a relatively common cause of increased signal within the anterior cruciate ligament (ACL). The appearance can mimic acute or chronic interstitial partial tears of the ACL. How...
Case

Recurrent astrocytoma (MR perfusion)

 Diagnosis almost certain
A.Prof Frank Gaillard
Published 19 Dec 2008
74% complete
MRI
Article

Normal myelination

After normal myelination in utero, myelination of the neonatal brain is far from complete. The first myelination is seen as early as the 16th week of gestation, in the column of Burdach, but only really takes off from the 24th week 1. It does not reach maturity until 2 years or so. It correlates...
Article

T1 weighted image

T1 weighted image (also referred to as T1WI or the "spin-lattice" relaxation time) is one of the basic pulse sequences in MRI and demonstrates differences in the T1 relaxation times of tissues. A T1WI relies upon the longitudinal relaxation of a tissue's net magnetisation vector (NMV). Basicall...

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