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The effect of varying spectral resolution on the quality of high spectral and spatial resolution magnetic resonance images of the breast
Author(s) -
Medved Milica,
Du Weiliang,
Zamora Marta A.,
Fan Xiaobing,
Olopade Olufunmilayo I.,
MacEneaney Peter M.,
Newstead Gillian,
Karczmar Gregory S.
Publication year - 2003
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.10378
Subject(s) - resolution (logic) , spectral resolution , image resolution , magnetic resonance imaging , nuclear magnetic resonance , quality (philosophy) , high resolution , resonance (particle physics) , physics , optics , remote sensing , materials science , radiology , medicine , spectral line , computer science , geology , artificial intelligence , astronomy , atomic physics , quantum mechanics
Abstract Purpose To evaluate the effect of varying spectral resolution on image quality of high spectral and spatial resolution (HiSS) images. Materials and Methods Eight women with suspicious breast lesions and six healthy volunteers were scanned using echo‐planar spectroscopic imaging (EPSI) at 1.5 Tesla with 0.75‐ to 1‐mm in‐plane resolution and 2.3‐ to 2.6‐Hz spectral resolution. Time domain data were truncated to obtain proton spectra in each voxel with varying (2.6–83.3 Hz) resolution. Images with intensity proportional to water signal peak heights were synthesized. Changes in water signal line shape following contrast injection were analyzed. Results Fat suppression is optimized at ∼10‐Hz spectral resolution and is significantly improved by removal of wings of the fat resonance. This was accomplished by subtracting a Lorentzian fit to the fat resonance from the proton spectrum. The water resonance is often inhomogeneously broadened, and very high spectral resolution is necessary to resolve individual components. High spectral resolution is required for optimal contrast in anatomic features with very high T 2 * (e.g., within a lesion) and for detection of often subtle effects of contrast agents on water signal line shape. Conclusion Despite a trade‐off between the spectral resolution and signal‐to‐noise ratio, it is beneficial to acquire data at the highest spectral resolution currently attainable at 1.5 Tesla. J. Magn. Reson. Imaging 2003;18:442–448. © 2003 Wiley‐Liss, Inc.