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Purpose: To expand the capabilities of Zero Echo Time (ZTE) pulse sequenceswith a slice selection method suitable for the shortest-lived tissues in thebody.  Methods: We introduce two new sequences that integrate spin-locking pulsesinto standard ZTE imaging to achieve slice selection: one for moderately short$T_2$ (DiSLoP), the other for ultra-short $T_2$ samples (PreSLoP). Thesemethods exploit the slower signal decay (at $T_{1\rho}\gg T_2$) to retain themagnetization in the slices during the selection process, which is otherwisecomparable to or even much longer than $T_2$.  Results: We demonstrate control over the slice profiles and positions for 2Dimaging. We measure magnetization decay times during spin-locking ($T_{1\rho}$)as a function of pulse amplitude, showing significant lifetime enhancement foramplitudes as low as 10 uT. We show imaging of slice-selected samples with$T_2$ characteristic times in the range of single milliseconds with DiSLoP andPreSLoP, and with the latter for sub-millisecond $T_2$ tissues. As compared tostandard 3D ZTE sequences, PreSLoP achieves the same signal-to-noise ratio(SNR) in 2-5 times shorter scan times, and we argue that this is due to thefilling scheme of the finite gap at the center of $k$-space unavoidable withZTE sequences. Finally, we discuss a combination of DiSLoP with a dynamicaldecoupling sequence to avoid this central gap, leading to further scan timeaccelerations.  Conclusions: The proposed sequences are capable of slice-selected 2D imagingof tissues with $T_2$ as low as 275 us with good SNR within clinicallyacceptable scan times.

Slice-selective Zero Echo Time imaging of ultra-short T2 tissues based on spin-locking