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Titolo:
QUANTITATION OF T-2' ANISOTROPIC EFFECTS ON MAGNETIC-RESONANCE BONE-MINERAL DENSITY-MEASUREMENT
Autore:
YABLONSKIY DA; REINUS WR; STARK H; HAACKE EM;
Indirizzi:
WASHINGTON UNIV,SCH MED,EDWARD MALLINCKRODT INST RADIOL,510 S KINGSHIGHWAY BLVD ST LOUIS MO 63110 SIEMENS MED SYST INC ERLANGEN GERMANY
Titolo Testata:
Magnetic resonance in medicine
fascicolo: 2, volume: 37, anno: 1997,
pagine: 214 - 221
SICI:
0740-3194(1997)37:2<214:QOTAEO>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
VERTEBRAL TRABECULAR BONE; CANCELLOUS BONE; ARCHITECTURE; AGE; INTERFEROMETRY; OSTEOPOROSIS; MODEL; FIELD;
Keywords:
OSTEOPOROSIS; BONE MINERAL DENSITY; MR SUSCEPTIBILITY EFFECTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
D.A. Yablonskiy et al., "QUANTITATION OF T-2' ANISOTROPIC EFFECTS ON MAGNETIC-RESONANCE BONE-MINERAL DENSITY-MEASUREMENT", Magnetic resonance in medicine, 37(2), 1997, pp. 214-221

Abstract

In this paper, the authors quantitate the anisotropy of susceptibility effects in an uniaxial trabecular bone model and show its relevance to clinical MR bone mineral density measurements. A physical model is described that quantitates the anisotropic MR behavior of uniaxial trabecular bone. To test the model, a phantom of parallel polyethylene filaments was scanned every 15 degrees between 0 degrees and 90 degrees with respect to the system's main magnetic field ((B) over right arrow(0)). The distal radial metaphysis of a healthy female volunteer was scanned in orthogonal projections. The signal from each phantom image and each radial image was separated in a pixel-wise fashion into R(2) and R(2)' maps. As predicted, R(2)' relaxation showed anisotropic behavior and changed according to sin(2) (theta), confirming that columnar structures parallel with <(B)over right arrow(0)> will cause no MR susceptibility effects. Scans of the distal radius showed that R(2)' relaxation was twice as great with the forearm perpendicular to <(B)over right arrow(0)> as when it was parallel to it, demonstrating different contributions from struts and columns. For both phantom and radial bone scans, R(2) relaxation was isotropic and did not change with object orientation.

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Documento generato il 07/04/20 alle ore 22:29:22