Fifteen necropsy specimens of human descending aorta and from eight patients with atheromatous vascular disease were studied by magnetic resonance imaging at 0.5 T. Images were acquired in coronal and transverse planes to localised protruding lesions and then chemical shift imaging was performed by techniques described by Dixon and by Hinks. These techniques produce images in which signal stren...

A mechanical device (NMR lift) has been built to displace vertically an object (typically an NMR sample tube) inside the NMR probe with an accuracy of 1 microm. A series of single pulse experiments are performed for incremented vertical positions of the sample. With a sufficiently spatially selective radio-frequency (r.f.) field, one obtains chemical shift information along the displacement dir...

To prove feasibility of proton chemical shift imaging ((1)H CSI) during stereotactic procedure, authors performed (1)H CSI in combination with a stereotactic headframe and selected targets according to local metabolic information, evaluated the pathologic results. The (1)H CSI directed stereotactic biopsy was performed in four patients. (1)H CSI and conventional Gd-enhancement stereotactic MRI ...

Introduction Positron emission tomography is a widely used and established tool for clinical tumour diagnosis and is the gold standard for metabolic imaging. The method complements MR imaging with respect to its metabolic specificity and helps to judge the malignancy and extent of the tumour tissue. Recently, the need to perform two separate scans has been negated through the development of new...

Hyperpolarized 13C offers high signal-to-noise ratios for imaging metabolic activity in vivo, but care must be taken when designing pulse sequences because the magnetization cannot be recovered once it has decayed. It has a short lifetime, on the order of minutes, and gets used up by each RF excitation. In this paper, we present a new dynamic chemical-shift imaging method that uses specialized ...

A 65 yrs old male patient and a known case of carcinoma of prostate with finding of a small adrenal mass on CT scan. MRI is done to rule out metastasis of adrenal. On in-phase and out phase imaging (Figs. 1,2) showing a significant loss of signals within the mass on out of phase imaging suggestive of lipid rich adrenal adenoma. The signal intensity drops below signals of spleen. Fig. 1 : In pha...

Introduction: Chemical-shift based fat and water separation techniques [1,2] are very common in practice and are effective in revealing important clinical information. They require imaging at multiple echo times, which often results in additional scan time. As compressed sensing (CS) [3-5] acceleration techniques become more available, it is necessary to be able to separate between fat and wate...