Photocoagulation of Cerebral Arteriovenous Malformations and Arterial Aneurysms with the Neodymium: Yttrium-Aluminum-Garnet or Argon Laser: Preliminary Results in Twelve Patients

Neurosurgery ◽  
1982 ◽  
Vol 11 (6) ◽  
pp. 754-760 ◽  
Author(s):  
Victor Aldo Fasano ◽  
Rosa Urciuoli ◽  
Roberto Maria Ponzio
Keyword(s):  
Arteriovenous Malformations ◽  
Yttrium Aluminum Garnet ◽  
Argon Laser ◽  
Parent Artery ◽  
New Techniques ◽  
Preliminary Results ◽  
Yttrium Aluminum ◽  
Neodymium:Yttrium Aluminum Garnet Laser ◽  
Intraoperative Rupture ◽  
Arterial Aneurysms

Abstract Six arteriovenous malformations (AVMs) and five arterial aneurysms (AAs) were treated with either argon or neodymium:yttrium-aluminum-garnet laser irradiation; one AVM was treated with both. All AVMs were occluded completely, leaving adjacent tissue untouched and preserving the regional vascularization. Photocoagulation produced varying effects on AAs: in one case an intraoperative rupture was sealed, in two cases the volume of an ectasia was reduced when the bleeding and thinner areas were coagulated, and in one case a saccular aneurysm was progressively and completely obliterated while the patency of the parent artery was preserved. These preliminary results are satisfactory; more experience will indicate how and when these new techniques can replace traditional ones or be used in combination with them.

A Combinatorial Chemistry Study of YAG Nucleation

2003 ◽  
Vol 804 ◽  
Author(s):  
Randall S. Hay
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Combinatorial Chemistry ◽  
Yttrium Aluminum Garnet ◽  
Combinatorial Method ◽  
Preliminary Results ◽  
Large Numbers ◽  
Yttrium Aluminum ◽  
Size Of Nuclei

ABSTRACTA combinatorial method to screen large numbers of dopants that affect the nucleation of yttrium-aluminum garnet was developed. The method involves heat-treatment of electron-transparent sol-derived thin films on TEM grids, and counting the number and size of nuclei by TEM. Advantages and limitations of the technique are discussed. Preliminary results are presented.

Nd:YAG Adhesiolysis: A Novel Approach to Tractional Retinal Detachment From Beyond-the-Edge Proliferation After Retinectomy

2018 ◽  
Vol 2 (6) ◽  
pp. 374-378
Author(s):  
Ross Chod ◽  
Gennady Landa ◽  
Richard Rosen
Keyword(s):  
Nd:Yag Laser ◽  
Yttrium Aluminum Garnet ◽  
Adhesion Formation ◽  
Subretinal Fluid ◽  
Argon Laser ◽  
Tractional Retinal Detachment ◽  
Band Formation ◽  
Novel Approach ◽  
Yttrium Aluminum ◽  
Tractional Forces

Retinectomy can be complicated by recurrent retinal elevation and subretinal fluid (SRF) accumulation secondary to tractional chorioretinal adhesion band formation and contraction. Classically, this complication requires repeat vitrectomy with destruction of adhesion bands using the vitrectomy instrument. We present a novel, nonoperative technique utilizing neodymium-yttrium-aluminum-garnet (Nd:YAG) laser to address tractional retinal elevation of a retinectomy edge causing SRF accumulation secondary to peripheral chorioretinal adhesion formation after retinectomy. Nd:YAG laser was used to perform targeted adhesiolysis to release the tractional forces on the retina, after which argon laser retinopexy was performed. Retinal reattachment with resolution of SRF was achieved without the need for reoperation.

Yag Single Crystals for Scintillators of Stem

1990 ◽  
Vol 48 (1) ◽  
pp. 166-167
Author(s):  
M. Hibino ◽  
K. Irie ◽  
R. Autrata ◽  
P. schauer
Keyword(s):  
Single Crystals ◽  
Yttrium Aluminum Garnet ◽  
Light Guide ◽  
Detection System ◽  
Polished Surface ◽  
Detective Quantum Efficiency ◽  
Backscattered Electrons ◽  
Electron Detection ◽  
Yttrium Aluminum ◽  
Phosphor Screens

Although powdered phosphor screens are usually used for scintillators of STEM, it has been found that the phosphor screen of appropriate thickness should be used depending on the accelerating voltage, in order to keep high detective quantum efficiency. 1 It has been also found that the variation in sensitivity, due to granularity of phosphor screens, makes the measurement of fine electron probe difficult and that the sensitivity reduces with electron irradiation specially at high voltages.In order to find out a preferable scintillator for STEM, single crystals of YAG (yttrium aluminum garnet), which are used for detecting secondary and backscattered electrons in SEM were investigated and compared with powdered phosphor screens, at the accelerating voltages of 100kV and 1 MV. A conventional electron detection system, consisting of scintillator, light guide and PMT (Hamamatsu Photonics R268) was used for measurements. Scintillators used are YAG single crystals of 1.0 to 3.2mm thicknesses (with surfaces matted for good interface to the light guide) and of 0.8mm thickness (with polished surface), and powdered P-46 phosphor screens of 0.07mm and 1.0mm thicknesses for 100kV and 1MV, respectively. Surfaces on electron-incidence side of all scintillators are coated with reflecting layers.

scholarly journals Preparation of Ce-doped yttrium aluminum garnet phosphor particles using spray drying method

2020 ◽  
pp. 1-8
Author(s):  
Shao-Ju Shih ◽  
Lewi Peter Richardo ◽  
Kevin Indrawan Sucipto ◽  
Zhi-Meng Wang
Keyword(s):  
Spray Drying ◽  
Yttrium Aluminum Garnet ◽  
Drying Method ◽  
Yttrium Aluminum

scholarly journals Intracranial arterial aneurysms in childhood: case report

2006 ◽  
Vol 64 (3a) ◽  
pp. 676-680 ◽  
Author(s):  
Fernando Campos Gomes Pinto ◽  
Leandro Valiengo ◽  
Pedro Paulo Mariani Lima Santos ◽  
Hamilton Matushita ◽  
José Píndaro Pereira Plese
Keyword(s):  
Case Report ◽  
Cerebral Aneurysm ◽  
Operative Technique ◽  
Vessel Wall ◽  
Internal Carotid ◽  
Carotid Bifurcation ◽  
Early Surgery ◽  
Arterial Aneurysm ◽  
Intraoperative Rupture ◽  
Arterial Aneurysms

A case of an intracranial arterial aneurysm at internal carotid bifurcation in a 10-year-old girl is described with the special features of cerebral aneurysm which occur in children, comparing with the adults. We alert for the necessity of carefully operative technique in order to avoid damage and intraoperative rupture of the aneurysm due to the very thin vessel wall that this population can develop. Our recommendation is early surgery in these patients.

Interpretation of Alumina/Yttrium-Aluminum Garnet Orientation Relationships by Geometric Criteria

1990 ◽  
Vol 209 ◽  
Author(s):  
R.S. Hay ◽  
L.E. Matson
Keyword(s):  
Structural Unit ◽  
Yttrium Aluminum Garnet ◽  
Sol Gel ◽  
Interface Energy ◽  
Interface Structure ◽  
Invariant Line ◽  
Directionally Solidified ◽  
Orientation Relationships ◽  
Yttrium Aluminum

ABSTRACTGeometric criteria for low interface energy and interface structure were tested for the cubic-rhombohedral system YAG/alumina. Orientation relationships near (111){110}a // (112){110}y and facets on (111)a(112)y were observed in both sol-gel derived composites and directionally solidified eutectic composites. The ΣYAG=12 near-CSL of 2{111}, {110}, {112} was inferred to be the preferred structural unit. Dislocations with b=1/3{111}a and b=1/2{110}a were observed and inferred to accomodate deviation from the structural unit, respectively. The {110}a,y direction met some of the criteria for an invariant line. Although the OR was explained by geometric criteria it would have been difficult to predict it with such criteria

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