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symbol for the element iridiumiridium
, metallic chemical element; symbol Ir; at. no. 77; at. wt. 192.217; m.p. about 2,410°C;; b.p. about 4,130°C;; sp. gr. 22.55 at 20°C;; valence +3 or +4.
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Abbrev. for infrared.




Abbr. for “inside radius.”






The country code for Iran.


(1) (Industry Remarketer) See VAR and VAD.

(2) See infrared, IR detector and IrDA.

(3) See information resources.
References in periodicals archive ?
3) A striking way of portraying delayed enhancement is using inversion recovery sequences that null myocardial tissue and thus enhance the contrast of the damaged tissue.
Don't just rely on the sagittal T2, but try variations like proton density or Short Tau Inversion Recovery (STIR).
Examination of magnetic resonance imaging fluid-attenuation inversion recovery sequences has already become a routine procedure, and fluid-attenuation inversion recovery is the sequence of choice for subtle, noncontrast-enhancing lesions, such as gliomatosis cerebri, in which its advantages include exquisite sensitivity and lack of the background ventricular and subarachnoid space cerebrospinal fluid signal "noise" seen in T2-weighted sequences.
Occasionally, MRI has difficulty distinguishing an epidermoid from an arachnoid cyst; this problem can be overcome with a fluid-attenuated inversion recovery (FLAIR) MRI when an epidermoid is hyperintense.