Reduction of blurring in view angle tilting MRI

Magnetic resonance imaging (MRI) in the presence of metallic objects suffers from slice‐selection errors and in‐plane distortions. View angle tilting (VAT) corrects for in‐plane distortions by adding a gradient on the slice‐select axis during readout, but can suffer from image blurring. This work demonstrates that the major source of blurring is a slice profile modulation of the data, and proposes several solutions to prevent such blurring. Multiple high‐bandwidth readouts are demonstrated to reduce the blurring while improving the signal‐to‐noise ratio (SNR) over a single high‐bandwidth readout. Magn Reson Med 53:418–424, 2005. © 2005 Wiley‐Liss, Inc.

[1]  Meir Shinnar.  Reduced power selective excitation radio frequency pulses , 1994, Magnetic resonance in medicine.

[2]  A. Mackay,et al.  Quantitative assessment of an MR technique for reducing metal artifact: application to spin-echo imaging in a phantom , 2001, Skeletal Radiology.

[3]  D B Plewes,et al.  Nonsusceptibility artifacts due to metallic objects in MR imaging , 1995, Journal of magnetic resonance imaging : JMRI.

[4]  J. Pauly,et al.  Design of symmetric‐sweep spectral‐spatial RF pulses for spectral editing , 2004, Magnetic resonance in medicine.

[5]  Qing-San Xiang,et al.  Quantitative evaluation of metal artifact reduction techniques , 2004, Journal of magnetic resonance imaging : JMRI.

[6]  J M Pauly,et al.  Management of biopsy needle artifacts: Techniques for RF‐refocused MRI , 1999, Journal of magnetic resonance imaging : JMRI.

[7]  J. Pauly,et al.  Dualband spectral‐spatial RF pulses for prostate MR spectroscopic imaging , 2001, Magnetic resonance in medicine.

[8]  Hollis G Potter,et al.  Magnetic resonance imaging after total hip arthroplasty: evaluation of periprosthetic soft tissue. , 2004, The Journal of bone and joint surgery. American volume.

[9]  Z H Cho,et al.  Total inhomogeneity correction including chemical shifts and susceptibility by view angle tilting. , 1988, Medical physics.

[10]  K Butts,et al.  The use of view angle tilting to reduce distortions in magnetic resonance imaging of cryosurgery. , 2000, Magnetic resonance imaging.

[11]  J S Lewin,et al.  Pulse sequences for interventional magnetic resonance imaging. , 2000, Topics in magnetic resonance imaging : TMRI.

[12]  G C McKinnon,et al.  Optimized outer volume suppression for single‐shot fast spin‐echo cardiac imaging , 1998, Journal of magnetic resonance imaging : JMRI.

[13]  J. Pauly,et al.  Parameter relations for the Shinnar-Le Roux selective excitation pulse design algorithm [NMR imaging]. , 1991, IEEE transactions on medical imaging.

[14]  S. Pickup,et al.  Pulses with fixed magnitude and variable phase response profiles , 1995, Magnetic resonance in medicine.

[15]  Kenneth A Buckwalter,et al.  Technical considerations: CT and MR imaging in the postoperative orthopedic patient. , 2002, Seminars in musculoskeletal radiology.

[16]  A. Mackay,et al.  Metal artifact reduction sequence: early clinical applications. , 2000, Radiographics : a review publication of the Radiological Society of North America, Inc.

[17]  J. Kurhanewicz,et al.  Very selective suppression pulses for clinical MRSI studies of brain and prostate cancer , 2000, Magnetic resonance in medicine.