There are multiple definitions:

1. Time-resolved angiography With Interleaved Stochastic Trajectories(English)

   • a reliable imaging modality for the assessment of lower extremity tumors
   • AVF, MRA
   • Medical imaging
   • https://doi.org…jro.2016.08.006

2. time without significant symptoms of toxicity(English)

   • as exploratory endpoint in patients with advanced ovarian cancer and a BRCA mutation in response after platinum-based chemotherapy
   • BRCA, HRQoL, OC, TOI
   • Toxicology, Chemotherapy, Oncology
   • https://doi.org…2045(21)00098-X