No abstract available.
Magnetic Resonance Imaging* ; Myelography*

A retrospective and cross sectional survey was carried out in 52 patients with cervical disc displacement who were screened by magnetic resonance at Viet Duc Hospital and Military Hospital 103 from Jan 2003 to Oct 2004. Sites of common displacement: C5-C6 (36.61%); C4-C5 (26.79%); C3-C4 (23.21%); C6-C7 (11.61%); C7-D1 (1.79%). Disc displacement in one layer was 42.31%, in two 11.54%, in three layers 34.61%, in four 11.54%, in centre 71.43%, beside centre 25%, in foramen 3.57%. Displacement image was looked clearly in T1W and T2W image. 100 displaced discs reduced signal in T2W image, 63.46% reduced disc height, 42.31% increased medulla signal equal with site of displacemen in T2W image
Magnetic Resonance Imaging ; Spine

The contrast substances have been used in the magnetic resonance imaging (MRI) to increase the sensitivity and specificity of diagnosis. It impacts on the density of proton and spin-spin time (T1 and T2). There were many different substances studied to increase the density of proton such as water, alcohol, hydrocarbon, and sugar or perfluoroctyl bromide. However, only paramagnetic compounds impacts on the spin-spin time were studied much and are being used.
Magnetic Resonance Imaging ; diagnosis

Magnetic resonance imaging with its superior soft tissue contrast resolution and absence of beam hardening artifacts, combined with its ability to perform multiplanar imaging, is now effective tool in diagnostic imagings. Magnetic resonance is primarily a phenomenon that involves atomic nuclei. It provides totally new clinical informations with no known hazards through the use of very weak interactions with endogenous stable magnetic atomic nuclei. This article briefly summarized the basic mechanism of generation and detection of the signals and general sorts of tissue properties which can influence the signals and thereby give rise to tissue contrast. It also describes how the machine-operating parameters can be used to manipulate the tissue contrast observed in the image.
Artifacts ; Magnetic Resonance Imaging*

According to many years of MR experience for maintenance, Through careful observations artifacts, according to the easy first principle, use the process of elimination, first check the external environment to the interior of the machine, the layers of delivery in the cause of failure, eliminate the artifact.
Artifacts ; Magnetic Resonance Imaging

No abstract available.
Magnetic Resonance Imaging*

No abstract available.
Magnetic Resonance Imaging*

This article briefly summarized conventional k-space technique, partial k-space sampling and key hole technique, then introduced the latest applications during these years.
Magnetic Resonance Imaging

No abstract available.
Humans ; Magnetic Resonance Imaging*

Metaphyseal cysts are common findings in Legg-Calv Perthes(LCP) disease, though usually disappear within 6-12 months. Several studies have described the MR imaging findings of these cysts, though serial MRI findings have not been documented. In this report, therefore, we report the serial MRI results of metaphyseal cyst in LCP patients.
Humans ; Magnetic Resonance Imaging