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Heidi A. Ward
Researcher at Mayo Clinic
Publications - 22
Citations - 5035
Heidi A. Ward is an academic researcher from Mayo Clinic. The author has contributed to research in topics: Imaging phantom & Rigid body. The author has an hindex of 14, co-authored 22 publications receiving 4430 citations. Previous affiliations of Heidi A. Ward include General Electric & GE Healthcare.
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Journal ArticleDOI
The Alzheimer's Disease Neuroimaging Initiative (ADNI): MRI methods.
Clifford R. Jack,Matt A. Bernstein,Nick C. Fox,Paul M. Thompson,Gene E. Alexander,Danielle J Harvey,Bret J. Borowski,Paula J. Britson,Jennifer L. Whitwell,Chadwick P. Ward,Anders M. Dale,Joel P. Felmlee,Jeffrey L. Gunter,Derek L. G. Hill,Ronald J. Killiany,Norbert Schuff,Sabrina Fox-Bosetti,Chen Lin,Colin Studholme,Charles DeCarli,Gunnar Krueger,Heidi A. Ward,Gregory J. Metzger,Katherine T. Scott,Richard Philip Mallozzi,Daniel J. Blezek,Joshua Levy,Josef Phillip Debbins,Adam S. Fleisher,Marilyn S. Albert,Robert C. Green,George Bartzokis,Gary H. Glover,John P. Mugler,Michael W. Weiner +34 more
TL;DR: The approach taken in ADNI to standardization across sites and platforms of the MRI protocol, postacquisition corrections, and phantom‐based monitoring of all scanners could be used as a model for other multisite trials.
Journal ArticleDOI
Comparison of memory fMRI response among normal, MCI, and Alzheimer’s patients
Mary M. Machulda,Heidi A. Ward,Brett J. Borowski,Jeffrey L. Gunter,Ruth H. Cha,P. C. O'Brien,Ronald C. Petersen,B. F. Boeve,D. S. Knopman,David F. Tang-Wai,Robert J. Ivnik,Glenn E. Smith,Eric G. Tangalos,C. R. Jack +13 more
TL;DR: In this article, the authors used receiver operating characteristic (ROC) analyses to determine whether an fMRI memory encoding task distinguishes among cognitively normal elderly individuals, patients with mild cognitive impairment (MCI), and patients with early Alzheimer's disease (AD).
Journal ArticleDOI
Imaging artifacts at 3.0T.
TL;DR: Some of the imaging artifacts that are commonly observed with 3.0T imaging, and their root causes are described, and when possible, countermeasures that reduce the artifact level are described.
Journal ArticleDOI
Spherical navigator echoes for full 3D rigid body motion measurement in MRI.
TL;DR: In this paper, a 3D spherical navigator (SNAV) echo technique was developed to measure rigid body motion in all six degrees of freedom simultaneously by sampling a spherical shell in k-space.
Journal ArticleDOI
Prospective multiaxial motion correction for fMRI
Heidi A. Ward,Stephen J. Riederer,Roger C. Grimm,Richard L. Ehman,Joel P. Felmlee,Clifford R. Jack +5 more
TL;DR: A method for real‐time prospective correction of rotation and translation in all six degrees of rigid body motion by incorporating an orbital navigator echo for each of the sagittal, axial, and coronal planes into the fMRI pulse sequence is presented.