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Extra resources for Cardiology [Blueprints - Notes and Cases]

Example text

The k-t BLAST and k-t SENSE techniques permit typically fivefold to eightfold accelerations in cardiac imaging. In MR imaging, the information necessary to reconstruct an image is sampled sequentially, typically line-by-line in the spatial frequency or k-space domain. The distance between the lines in k-space is inversely proportional to the size of the field-of-view that encloses the object (see Appendix). To reconstruct an image from the sampled data the Fourier transform is applied. Faster scanning by means of reduced data acquisition schemes implies less dense sampling, with a resultant reduction of the field-of-view.

In this case, the loss in resolution is unacceptable, and additional postprocessing steps must be taken, using the inherent symmetry of the Fourier data to reconstruct the missing information. SEQUENTIAL THREE-DIMENSIONAL METHODS Distal saturation of blood flow that occurs in 3D time-of-flight sequences can also be reduced by reducing the thickness of the excitation slab and by using multiple 3D volumes to cover the region of interest. This method has been termed multiple overlapping thin slab acquisition or MOTSA (36).

20 motion while imaging the coronaries or breathing motion for the visceral vessels. Also, blood flow itself can degrade the quality of the depiction of the vascular lumen when that flow is either extremely low, extremely high, or disordered. Techniques for obtaining high quality MR angiograms have evolved with improvements in MR 41 42 instrumentation. As new performance capabilities become available, new techniques become feasible, and this trend can be expected to continue. In this chapter, a number of different methods for obtaining MR angiograms will be discussed.

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Cardiology [Blueprints - Notes and Cases] by E. Awtry, et al.,


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