1. A getting back or regaining; recuperation. 2. Emergence from general anesthesia. 3. In nuclear magnetic resonance, refers to relaxation. [M.E., fr. O.Fr. recoverer, fr. L. recupero, to recover, get back, fr. re-, again, + capio, to take]
- creep r. the time-dependent portion of the decrease in strain in a material or object following removal of the stress that has deformed it.
- inversion r. a magnetic resonance pulse sequence in which a series of 180° magnetic field inversions is followed by a spin echo sequence for signal detection; of note, during r., the longitudinal magnetization vector passes through zero.
- short TI inversion r. (STIR) an inversion r. sequence that uses a short inversion time, about 100 ms, between 180° pulses; by proper selection of TI, the signal from water or fat can be suppressed.
- spontaneous r. the return of the conditioned response, after apparent extinction, in the presence of the conditioned stimulus without the unconditioned stimulus also being present. See classical conditioning.
- ultrasonic egg r. obtaining an egg for in vitro fertilization by means of an ultrasonically guided needle aspiration of ovarian follicles; may be performed transvesically or via the cul-de-sac.
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Medical dictionary. 2011.