We demonstrate that whole-body, single-shot imaging is practical for imaging out of the central plane, including oblique axes. The technique is illustrated by images of the heart in the cardiac long- and short-axis and by coronal images of the brain. Secondary gradients can produce additional image distortion and ghosting in these images. These artifacts are a direct consequence, predictable by Maxwell's equations, of the large gradients used in echo planar imaging. We show that these effects are, in general, made smaller by working at a high magnetic field.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1002/mrm.1910290612 | DOI Listing |
Ann Rheum Dis
June 2013
Department of Radiology, Charité Medical University, Campus Mitte, Berlin, Germany.
Objective: To evaluate active inflammatory lesions (AIL) and structural changes (SC) in patients with active non-radiographic axial spondyloarthritis (nr-axSpA) compared with patients with ankylosing spondylitis (AS) on whole-body MRI (wb-MRI).
Method: 75 patients with active disease and a symptom duration of <5 years (39 with AS and 36 with nr-axSpA) were investigated with a comprehensive wb-MRI protocol and scored for AIL and SC in the spine, sacroiliac joints (SIJs) and non-axial manifestations.
Results: 92% of patients with AS showed active inflammation in the SIJ, 53% in the spine and 94% and 39%, respectively, in the nr-axSpA group.
Curr Rheumatol Rep
October 2009
Division of Rheumatology, MetroHealth Medical Center, 2500 MetroHealth Drive, Cleveland, OH 44109, USA.
In 1987, synovitis, acne, pustulosis, hyperostosis and osteitis (SAPHO) syndrome was proposed as an umbrella term for a group of diseases with similar musculoskeletal manifestations, in particular hyperostosis of anterior chest wall, synovitis, and multifocal aseptic osteomyelitis, observed in association with dermatologic conditions such as palmoplantar pustulosis, severe acne, and hidradenitis suppurativa. Despite recent advances in our understanding of the epidemiologic, pathophysiologic, and immunogenetic mechanisms involved in SAPHO syndrome, etiopathogenesis remains poorly understood. Propionibacterium acnes, the microorganism associated with acne, has been recovered on bone biopsy in some patients, but the possible pathogenetic role of an infectious agent in a genetically predisposed individual, resulting in exaggerated inflammatory response as "reactive osteitis," is a largely unproven hypothesis.
View Article and Find Full Text PDFMagn Reson Med
June 1993
Massachusetts General Hospital, Department of Radiology, Charlestown 02129.
We demonstrate that whole-body, single-shot imaging is practical for imaging out of the central plane, including oblique axes. The technique is illustrated by images of the heart in the cardiac long- and short-axis and by coronal images of the brain. Secondary gradients can produce additional image distortion and ghosting in these images.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!