T MRI Diagnostic Features Comparison with Lower Magnetic Fields

T. SCARABINO, G. M. GlANNATEMPO, T. POPOLIZIO, A. SlMEONE, A. MAGGIALETTI, N. MAGGIALETTI, U. SALVOLINI

3.0 T magnetic resonance (MR) units are optimized for high-resolution morphological and functional imaging, especially of the head and neck, and offer a number of advantages over lower-field systems, such as a higher signal/noise ratio (SNR) and greater spatial and temporal resolution (Fig. 3.1) [1-4]. Drawbacks include greater specific absorption rates (SAR), acoustic noise, and dielectric resonance, although in the more recent imagers these problems have largely been resolved by improvements in hardware and software.

MR scans acquired at 3.0 T and 1.5 T exhibit different diagnostic features that need to be taken into consideration when images are being interpreted and also to optimize sequence parameters. These same differences prevent transfer of 1.5 T study protocols to 3.0 T systems.

Fig. 3.1. High-resolution morphological and functional study of cerebral glioblastoma: SE T1 (a), FSE T2 (b), FLAIR (c), MRA (d), DWI (e), PWI (f), fMRI with motor task (g), and spectroscopy (h Cho map; i NAA map; l Lac/Lip map)

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Fig. 3.1. (Cont.)
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