Magnetic resonance imaging of the liver hemangioma

Abstract

15 liver hemangiom as Irom 10 patients were stud ied by mangetic resonance imaging (MRI) w ith 2.0 Tesla superconductive magnet in order to eva luate the detectability 01 the mass by MRI and to ana lyze the optimal pulse sequence in hi gh lield magnet. Identical multislice/multiecho techniques were used in all pati ents obtained with T1-and T2 weighted spin echo using TR 500, 1500, 2000 msec and TE 30, 60, 90, 120 msec. MRI could detect liver hemangiomas in all cases. Hemangioma tended to have sharp margin, homogeneous signa l intensi 야 and no capsu le and showed iso signal intensity in majority on SE 500/30 images. Hemangioma also had hi gh signa l inte n si 야 w ith prolongation 01 TR and TE. On T2 -weighted images obtain ed with 2000 msec TR and 60, 90, 120 msec TE, hemangiomas had signilicantly greater contrast between the mass and su rrounding li ver than that on T1 weighted im ages We believe that MRI may replace the angiography lor the diagnosis of hemangioma and may become th e procedure 01 choice lor lurther work up 01 suspected small hemangioma on so nography

Extremely non-equilibrium synthesis of luminescent zinc oxide nanoparticles through energetic ion condensation in a dense plasma focus device

“…The AFM images of ZnO nanoparticles deposited at room temperature on silicon and quartz substrates at a pressure of 80 Pa are shown in figure 3. Cho [45] produced ZnO nanoparticles and observed hexagonal crystal shapes at the substrate temperatures above 700 • C. Christoulakis et al [46] observed nanosphagetti-like structures deposited for longer periods of time when the thickness of their films increased to 200 nm. Thareja and Shukla [47] found ZnO nanoparticles which varied in shape from spherical to platelet-like structures after ablation in acetone.…”

Optical properties of ZnO/PMMA nanocomposite films

“…3 shows the temperature evolution of PL spectra in ZnO nanocrystals embedded into polymeric matrix PMMA in the temperature range from 85 to 290 K. Analysis of the low-temperature PL in ZnO NCs and its comparison with PL in bulk ZnO permits to define the nature and characteristics of the recombination processes in the nanoscale ZnO crystals near the absorption edge. The PL spectra are characterized by intensive emission in the near-UV region and lower emission in the green region of spectrum (507 nm) connected with the presence of intrinsic defects [6,7]. The recombination processes in ZnO NCs differ from that in bulk ZnO mainly, because of the larger surface-to-volume ratio and, therefore, larger amount of defects on the surface.…”