Prospective acquisition correction for head motion with image-based tracking for real-time fMRI
| Autor: | Stefan Thesen, Oliver Heid, Lothar R. Schad, Edgar Mueller |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Computer science
Translation (geometry) Imaging phantom Motion Data acquisition Computer Systems Image Processing Computer-Assisted Humans Radiology Nuclear Medicine and imaging Computer vision Simulation Orientation (computer vision) business.industry Phantoms Imaging Reproducibility of Results Motion detection Body movement Signal Processing Computer-Assisted Models Theoretical Rigid body Magnetic Resonance Imaging Head Movements Artificial intelligence business Artifacts Rotation (mathematics) Algorithms |
| Zdroj: | Magnetic resonance in medicine. 44(3) |
| ISSN: | 0740-3194 |
| Popis: | In functional magnetic resonance imaging (fMRI) head motion can corrupt the signal changes induced by brain activation. This paper describes a novel technique called Prospective Acquisition CorrEction (PACE) for reducing motion-induced effects on magnetization history. Full three-dimensional rigid body estimation of head movement is obtained by image-based motion detection to a high level of accuracy. Adjustment of slice position and orientation, as well as regridding of residual volume to volume motion, is performed in real-time during data acquisition. Phantom experiments demonstrate a high level of consistency (translation < 40 microm; rotation < 0.05 degrees ) for detected motion parameters. In vivo experiments were carried out and they showed a significant decrease of variance between successively acquired datasets compared to retrospective correction algorithms. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text