[Evaluation of three-dimensional contrast-enhanced MRA using differential rate k-space sampling (DRKS)].
The progress of three-dimensional (3D) magnetic resonance angiography used in combination with contrast medium (CE-MRA) has been remarkable. Currently, angiography aims at improvements in time resolution without sacrificing spatial resolution. We conducted a basic study of 3D differential rate k-space sampling (DRKS) in which the slice direction of the k-space is divided into two or more areas, the echo data near zero encoding is sampled by a higher time resolution than data in other areas, and reconstruction is done within a short time. This technique involved a problem in which ghost artifacts occur easily when the concentration of contrast medium changes extremely or when signal intensity changes suddenly. This is probably due to a difference in the time to sample data between the low- and high-frequency areas. When we used DRKS to grasp these characteristics, however, it was useful because it allowed reconstruction with an extremely high time resolution.
Watanabe
Kunihiro
K
Department of Radiology, Saitama Prefecture Saiseikai Kurihashi Hospital.
Kurita
Kouki
K
D016477:Artifacts; D003287:Contrast Media / Q000008:administration & dosage; D005069:Evaluation Studies as Topic; D019786:Gadolinium DTPA; D006801:Humans; D021621:Imaging, Three-Dimensional; D018810:Magnetic Resonance Angiography / Q000379:methods / Q000592:standards*; D008955:Models, Cardiovascular; D019047:Phantoms, Imaging
D003287:Contrast Media; D019786:Gadolinium DTPA