By Charles B. Higgins, Albert de Roos MD
--New chapters reflecting technological discoveries in cardiology
--Color illustrations for heightened clarity
--Companion site with absolutely searchable text
--Units equipped by means of pathology and disorder detection
--Fully up-to-date info on program of MR and CT
--Up-to-date research of rising multi-detector CT
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Extra resources for MRI and CT of the Cardiovascular System
Beyond this range, images are increasingly compromised by local noise ampliﬁcation. A different approach to faster imaging of dynamic objects is based on the observation of considerable correlation of image information in space and time. This becomes apparent, if for example, a cine image series of the heart is considered. Large regions of the image remain static or move in a coherent fashion. Accordingly, an optimized acquisition scheme would only need to update highly dynamic information at a high rate, while less dynamic or static information can be acquired at a much lower rate.
During the undersampling stage, very sparse sampling is applied along space and time resulting in, for example, eightfold scan time reduction. 26. 26. In the parlance of image reconstruction, the training data determines a ﬁlter which suppresses folding artifacts as a result of undersampled data. In a more general view, k-t BLAST and k-t SENSE may be compared to data compression as used on personal computers to reduce ﬁle sizes on a hard disk. By identifying redundant information such as the reoccurrence of certain patterns of numbers, an index for the pattern is saved instead of all individual numbers.
De Roos A, Doornbos J, van der Wall EE, et al. MR imaging of acute myocardial infarction: Value of Gd-DTPA. AJR Am J Roentgenol 1988;150(3):531–534. 24. Kim RJ, Fieno DS, Parrish TB, et al. Relationship of MRI delayed contrast enhancement to irreversible injury, infarct age, and contractile function. Circulation. 1999;100(19): 1992–2002. 25. Kim RJ, Wu E, Rafael A, et al. The use of contrast-enhanced magnetic resonance imaging to identify reversible myocardial dysfunction. N Engl J Med. 2000;343(20): 1445–1453.
MRI and CT of the Cardiovascular System by Charles B. Higgins, Albert de Roos MD