| Fast 3D imaging using variable-density spiral trajectories with applications to limb perfusion. | |
| | |
MedLine Citation:
|
PMID: 14648576 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Variable-density k-space sampling using a stack-of-spirals trajectory is proposed for ultra fast 3D imaging. Since most of the energy of an image is concentrated near the k-space origin, a variable-density k-space sampling method can be used to reduce the sampling density in the outer portion of k-space. This significantly reduces scan time while introducing only minor aliasing artifacts from the low-energy, high-spatial-frequency components. A stack-of-spirals trajectory allows control over the density variations in both the k(x)-k(y) plane and the k(z) direction while fast k-space coverage is provided by spiral trajectories in the k(x)-k(y) plane. A variable-density stack-of-spirals trajectory consists of variable-density spirals in each k(x)-k(y) plane that are located in varying density in the k(z) direction. Phantom experiments demonstrate that reasonable image quality is preserved with approximately half the scan time. This technique was then applied to first-pass perfusion imaging of the lower extremities which demands very rapid volume coverage. Using a variable-density stack-of-spirals trajectory, 3D images were acquired at a temporal resolution of 2.8 sec over a large volume with a 2.5 x 2.5 x 8 mm(3) spatial resolution. These images were used to resolve the time-course of muscle intensity following contrast injection. |
| | |
Authors:
|
Jin Hyung Lee; Brian A Hargreaves; Bob S Hu; Dwight G Nishimura |
Related Documents
:
|
20188366 - Three-dimensional computed tomography combined with hysterosalpingography is useful for... 18077966 - Optimizing computed tomography to reduce artifacts from titanium aneurysm clips: an in ... 18164156 - Preoperative 3t mr imaging of rectal cancer: local staging accuracy using a two-dimensi... 2925916 - Quantification of knee joint fluid volume by mr imaging and ct using three-dimensional ... 2105596 - Ct of intracranial cryptococcosis. 847146 - Value of ultrasonography in the detection of retroperitoneal inflammatory masses. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
|
Title: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine Volume: 50 ISSN: 0740-3194 ISO Abbreviation: Magn Reson Med Publication Date: 2003 Dec |
Date Detail:
|
Created Date: 2003-12-03 Completed Date: 2004-03-25 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 8505245 Medline TA: Magn Reson Med Country: United States |
Other Details:
|
Languages: eng Pagination: 1276-85 Citation Subset: IM |
Copyright Information:
|
Copyright 2003 Wiley-Liss, Inc. |
Affiliation:
|
Magnetic Resonance Systems Research Laboratory, Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA. ljnhy@mrsrl.stanford.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Contrast Media Gadolinium DTPA / diagnostic use Humans Imaging, Three-Dimensional* Ischemia / diagnosis Leg / blood supply* Magnetic Resonance Angiography / methods* Phantoms, Imaging |
| Chemical | |
Reg. No./Substance:
|
0/Contrast Media; 80529-93-7/Gadolinium DTPA |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Efficient k-space sampling by density-weighted phase-encoding.
Next Document: New hybrid technique for accurate and reproducible quantitation of dynamic contrast-enhanced MRI dat...