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Errors in quantitative dynamic three‐dimensional keyhole MR imaging of the breast
Author(s) -
Plewes Donald B.,
Bishop Jonathan,
Soutar Ian,
Cohen Eve
Publication year - 1995
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.1880050322
Subject(s) - keyhole , computer science , temporal resolution , sampling (signal processing) , pixel , encoding (memory) , data acquisition , image resolution , computer vision , artificial intelligence , physics , materials science , optics , filter (signal processing) , welding , metallurgy , operating system
Three‐dimensional (3D) keyhole magnetic resonance (MR) imaging has been proposed as a means of providing dynamic monitoring of contrast agent uptake by breast lesions, with complete breast coverage and high spatial and temporal resolution. The 3D keyhole technique dynamically samples the central regions of k‐space in both phase‐encoding directions and provides high‐frequency data from a precon‐trast acquisition. Errors due to data truncation with two‐dimensional and 3D region‐of‐lnterest measurements are estimated from a numerical simulation of various implementations of the 3D keyhole technique. Errors were found to increase with increasing temporal resolution and reduced object size. Errors of 75% are possible for objects with a diameter approaching 1 pixel when a 3D keyhole implementation that samples 50% of phase‐encoding data in each direction is used. Preliminary clinical Images with this approach illustrate artifacts consistent with inadequate k‐space sampling.