Rationale and Objective: Conventional MRI techniques to track ferumoxide-labeled stem cells rely on the detection of signal voids, which often mimic other image artifacts. Several bright marker imaging techniques have been proposed (1,2), but are either poorly suited for in vivo cardiac imaging or h
Application of anatomically shaped surface coils in MRI at 0.5 T
β Scribed by J. Doornbos; H. A. A. Grimbergen; P. E. Booijen; L. te Strake; J. L. Bloem; G. J. Vielvoye; E. Boskamp
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 697 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0740-3194
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β¦ Synopsis
The construction and application of eight different MRI surface coils is described. The coils consist of an anatomically shaped copper wire loop as an antenna and a printed circuit board containing electronic components for tuning and matching. The electronic device for tuning and matching is interchangeable between the various coils. Surface coils for signal detection yield images with high signal-to-noise ratio in comparison to the usual saddle-shaped head or body coils. The sensitivity of a surface coil decreases with increasing distance between the coil and the object of interest and therefore the coils are constructed to fit the anatomical structure under examination as well as possible. The application of dedicated surface coils for superficial structures in the body extends the possibilities of the MRI system. Photographs of the coils positioned on the body and MR images of volunteers and patients are shown.
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The RF field intensity distribution in the human brain becomes inhomogeneous due to wave behavior at high field. This is further complicated by the spatial distribution of RF field polarization that must be considered to predict image intensity distribution. An additional layer of complexity is invo
## Abstract ## Purpose To evaluate the potential of fullyβbalanced steadyβstate freeβprecession (SSFP) sequences in in vivo highβresolution (HR) MRI of trabecular bone at field strengths of 1.5 and 3 T by simulation and experimental methods. ## Materials and Methods Using simulation studies, ref