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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 ?
c) Short-tau inversion recovery (STIR) image shows high signal intensity corresponding to the area of low intensity in (b).
Use of fluid attenuated inversion recovery (FLAIR) pulse sequences in mri of the brain," Journal of Computer Assisted Tomography, vol.
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.
7), (8), (12) Recently, specific MRI findings have been described with fluid attenuated inversion recovery (FLAIR) and diffusion sequences.
Core sequences of the brain should include sagittal and axial Fluid Attenuated Inversion Recovery (FLAIR); axial T2; and axial T1 both pre-and post-gadolinium.
In addition, many techniques to reduce artifacts are introduced, such as fluid-attenuated inversion recovery and half-Fourier single-shot turbo spin-echo.
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.
Three-dimensional images were then generated for volumetric analyses, and fluid-attenuated inversion recovery (FLAIR) and T2-weighted coronal images were examined for possible abnormalities.
The lesions of the bilateral cerebellar periventricular area were revealed in every mode of images (fluid-attenuated inversion recovery, T2-weighted intensity, diffusion-weighted images, and T1WI) and were comparable with the patient's symptoms and signs.