Rapid autocorrection using prescan navigator echoes
نویسندگان
چکیده
منابع مشابه
Autocorrection in MR imaging: adaptive motion correction without navigator echoes.
A technique for automatic retrospective correction of motion artifacts on magnetic resonance (MR) images was developed that uses only the raw (complex) data from the MR imager and requires no knowledge of patient motion during the acquisition. The algorithm was tested on coronal images of the rotator cuff in a series of 144 patients, and the improvements in image quality were similar to those a...
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Introduction: The spherical navigator echo (SNAV) is ideal for tracking rigid body motion in all six degrees of freedom simultaneously [1, 2]. However, current iterative registration algorithms, used to calculate the rotations between two SNAVs, require significant computation time (seconds) and may be trapped in local minima within the search space. These shortcomings limit the feasibility of ...
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A common problem in clinical MRI is anatomic misalignment of imaging slices across successive examinations. This unnecessarily complicates the radiologic assessment of anatomic change over time on serial MRI studies. To address this problem, spherical navigator echoes, which can detect rigid body motion in all six degrees of freedom, were used to guide spatial location and orientation adjustmen...
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Navigator echoes are frequently used in cardiac magnetic resonance to monitor respiratory motion and have proved particularly useful in coronary artery imaging techniques where they allow the acquisition of data over multiple reproducible breathholds and during free breathing. The large number of variables involved in their use, however, is such that an optimal method of application may yet hav...
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Spiral imaging does not produce apparent flow artifacts. However, it remains sensitive to rapid rigid body motion. In this abstract, a motion correction technique using an orbital navigator “ring” in interleaved spiral imaging is presented. In this technique, a circular k-space trajectory is incorporated into each spiral interleaf. Data inconsistency due to both rotation and translation can be ...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2000
ISSN: 0740-3194,1522-2594
DOI: 10.1002/(sici)1522-2594(200004)43:4<583::aid-mrm13>3.0.co;2-b