Abstract
In recent years, with development of new MRI techniques, noninvasive evaluation of global and regional cardiac function is becoming a reality. One of the methods used for this purpose is MRI tagging. In tagging, spatially encoded magnetic saturation planes, tags, are created within tissues. These act as temporary markers and move with the tissue. In cardiac tagging, tag deformation pattern provides useful qualitative and quantitative information about the functional properties of underlying myocardium. The measured deformation of a single tag plane contains only unidirectional information of the past motion. In order to track the motion of a cardiac material point, this sparse, single dimensional data has to be combined with similar information gathered from other tag sets and all time frames. Previously, several methods have been developed which rely on the specific geometry of the chambers. Here, we employ an image plane based, simple cartesian coordinate system and provide a stepwise method to describe the heart motion using a four-dimensional tensor product of B-splines. The proposed displacement and forward motion fields exhibited sub-pixel accuracy. Since our motion fields are parametric and based on an image plane based coordinate system, trajectories or other derived values (velocity, acceleration, strains...) can be calculated for any desired point on the MRI images. This method is sufficiently general so that the motion of any tagged structure can be tracked.
Original language | English (US) |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
Publisher | Society of Photo-Optical Instrumentation Engineers |
Pages | 46-56 |
Number of pages | 11 |
Volume | 3660 |
State | Published - 1999 |
Event | Proceedings of the 1999 Medical Imaging - Physiology and Function from Multidimensional Images - San Diego, CA, USA Duration: Feb 21 1999 → Feb 23 1999 |
Other
Other | Proceedings of the 1999 Medical Imaging - Physiology and Function from Multidimensional Images |
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City | San Diego, CA, USA |
Period | 2/21/99 → 2/23/99 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics