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Contrast enhanced mra with highly constrained backprojection reconstruction using phase contrast composite image

A technology for contrast enhancement and compositing images, applied in the field of RUCTIONUSING PH

Active Publication Date: 2009-11-04
WISCONSIN ALUMNI RES FOUND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as is known in the art, if certain corrections are made to each signal curve 11 and a sufficient number of curves are acquired at a corresponding number of projection angles, the error due to this false assumption can be minimized and the image Artifacts are suppressed

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  • Contrast enhanced mra with highly constrained backprojection reconstruction using phase contrast composite image
  • Contrast enhanced mra with highly constrained backprojection reconstruction using phase contrast composite image
  • Contrast enhanced mra with highly constrained backprojection reconstruction using phase contrast composite image

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Embodiment Construction

[0053] Detailed description of the preferred embodiment

[0054] For details, see figure 1 , a preferred embodiment of the present invention is employed in an MRI system. The MRI system includes a workstation 110 having a display 112 and a keyboard 114 . Workstation 110 includes processor 116, which is a commercially available programmable machine running a commercially available operating system. Workstation 110 provides an operator interface that allows scanning specifications to be entered into the MRI system.

[0055] Workstation 110 is coupled to four servers: pulse sequence server 118 ; data acquisition server 120 ; data processing server 122 and data storage server 23 . In the preferred embodiment, data storage server 123 is implemented by workstation processor 116 and associated disk drive interface circuitry. The remaining three servers 118, 120 and 122 are executed by separate processors housed in a single enclosure and interconnected using a 64-bit backplane bu...

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Abstract

Mask projection views are obtained prior to the arrival of a contrast agent during a dynamic contrast enhanced MRA study. After the arrival of the contrast agent, a set of undersampled contrast enhanced projection views are obtained for each of a plurality of time frames. Corresponding mask projection views are subtracted from the contrast enhanced projection views to provide sparse contrast enhanced projection view sets. A phase contrast scan of a region of interest is performed prior to or after the arrival of the contrast agent. The phase contrast image is used as a composite image in a HYPR reconstruction of the sparse projection view sets to produce first pass contrast enhanced images. Iterative HYPR reconstructions can also be performed to remove venous information from the reconstructed images.

Description

[0001] Cross References to Related Applications [0002] This application is based upon the U.S. Provisional Application for Contrast Enhanced MRAWITH HIGHLY CONSTRAINED BACKPROJECTION RECONSTRUCTIONUSING PHASE CONTRAST COMPOSITE IMAGE, filed January 2, 2007 Patent Application No. 60 / 883,099. [0003] Statement Regarding U.S. Federally Funded Research [0004] This invention was made with United States Government support under Grant No. NIH HL072260 awarded by the National Institutes of Health. The US Government has certain rights in this invention. Background of the invention [0005] The field of the invention is contrast-enhanced magnetic resonance angiography ("CEMRA"), and more specifically, a method of reconstructing CEMRA images from highly undersampled magnetic resonance data. [0006] Magnetic resonance imaging (MRI) uses the phenomenon of nuclear magnetic resonance (NMR) to produce images. When a substance such as human tissue is subjected to a uniform magnetic f...

Claims

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Application Information

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IPC IPC(8): G01R33/28G01R33/563G01R33/561G01R33/565
CPCG01R33/56509G01R33/4824G01R33/56308G01R33/561G01R33/5601G01R33/56316G01R33/5635
Inventor C·A·米斯特塔K·M·约翰逊J·维尔吉纳T·M·格里斯特
Owner WISCONSIN ALUMNI RES FOUND
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