TrueFISP—technical considerations and cardiovascular applications
Section snippets
TrueFISP—technical considerations
Among many other factors, the quality of magnetic resonance images strongly depends on the signal-to-noise ratio (SNR) and the contrast-to-noise ratio (CNR). Unfortunately, with most imaging techniques the SNR drops significantly when one tries to scan faster. This is due to spin saturation effects when the pulse repetition time is in the order, or even shorter than the longitudinal relaxation time T1. In 1986 Oppelt [1] described a new gradient-echo magnetic resonance imaging (MRI) technique
Cardiac imaging
Over the last decade cardiac MR (CMR) has become the new gold standard for the evaluation of cardiac anatomy and function based on the high accuracy and reproducibility of CMR [4]. As described above, TrueFISP offers high SNR and CNR as well as high temporal resolution. Consequently, the image quality is much better as compared with the traditionally used spoiled gradient-echo fast low-angle shot (FLASH) MR technique. The blood-myocardial CNR is about two times higher compared with FLASH, the
Summary
SSFP sequences like TrueFISP have opened a new era in non-invasive cardiovascular imaging, especially in imaging of dynamic structures like the beating heart. This is due to highest achievable SNR and CNR and best possible temporal resolution.
TrueFISP has become the sequence of choice for evaluation of cardiac function, anatomy and late enhancement.
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