Diminishing variance process for real-time reduction of motion a

Details Diminishing variance process for real-time reduction of motion a Diminishing variance process for real-time reduction of motion a

1994-08-04

1995-06-27

Pfaffle, Krista M.

Surgery

Truss

Pad

128721, 324309, A61B 5055

Patent

active

054271010

ABSTRACT:
A method whereby motion can be detected in real time during the acquisition of MRI data. This enables the implementation of several algorithms to reduce or eliminate this motion from an image as it is being acquired. The method is an extension of the acceptance/rejection method algorithm called the diminishing variance algorithm (DVA). With this method, a complete set of preliminary data is acquired along with information about the relative motion position of each frame of data. After all the preliminary data is acquired, the position information is used to determine which lines are most corrupted by motion. Frames of data are then reacquired, starting with the most corrupted frame. The position information is continually updated in an iterative process, therefore each subsequent reacquisition is always done on the worst frame of data. The algorithm has been implemented on several different types of sequences, and preliminary in vivo studies indicate that motion artifacts are dramatically reduced.

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