Errors in T1-determination using multislice technique and Gaussian slice profiles

✍ Scribed by M. Just; H.P. Higer; P. Pfannenstiel

• Book ID: 103909155
• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 890 KB
• Volume: 6
• Category: Article
• ISSN: 0730-725X
• DOI: 10.1016/0730-725x(88)90523-1

✦ Synopsis

Multislice SE-or IR-sequences with different TRand T,-times, respectively, are often used, to determine Tland T,-values for tissue characterisation. To investigate the perturbating influence of the sequential excitation in multislice technique, we measured the signal intensities and calculated the T,-values of phantoms as a function of gap widths between neighboured slices. Phantoms contained fluids of different T,. We found a strong dependence of signal intensities and therefore of calculated T,-values on the gap width, when a T,/T,-ratio of more than 0.3-0.4 was reached. T,-values are considerably overestimated in this case, whereas T,-values are not influenced by the sequential excitation. We conclude that reliable T,-measurements necessitate a large spacing of more than 1 slice thickness between adjacent slices.