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RISS 인기검색어
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- 저자 : Nalcioglu, Orhan (검색결과 2 건)
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Imaging System Science Laboratory
Nalcioglu, O.,Cho, Z.H. The Korean Society of Medical and Biological Engin 1983 의공학회지 Vol.4 No.1
Characteristics of the lung inflation and deflation reflexes were measured at various temperatures on the cervical vagi in five anesthetized mongrel dogs. Nerve temperature was maintained at the body temperature, and 2-14˚C with 2˚C apart using a specially designed automated vagal cooling apparatus with an accuracy to within $\pm$ 0.1˚c at each temperature. The inflation reflex was blocked abruptly at 8-10˚C. The deflation reflex started weakened at 14˚C, thereafter showed a gradual blockade with the temperature decreased with a substantial variance among the animals.It was approximately 75% blocked at 2-5˚C. These differences in temperature characteristics made it hard to differentiate the deflation reflex from the inflation reflex. In one animal, however, the inflation reflex was completely blocked with the deflation reflex almost alive at 6-8˚C. This suggests that differential cold blockade of the vagal reflexes can be done only in selected subjects. Furthermore, the fact that these two reflexes were blocked at different temperatures may be due to the differences in the nerve fiber size and the changes in the conduction velocity with temperature.
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Development of a QA phantom and protocol for proton magnetic resonance spectroscopy
Woo, Dong-Cheol,Choi, Chi-Bong,Kim, Sang-Soo,Rhim, Hyang-Shuk,Jahng, Geon-Ho,Baek, Hyeon-Man,Nalcioglu, Orhan,Choe, Bo-Young Wiley Subscription Services, Inc., A Wiley Company 2009 Concepts in magnetic resonance. Part B, Magnetic r Vol.b35 No.3
<P>The purpose of this study was to develop a special proton magnetic resonance spectroscopy (1H-MRS) phantom, to establish and verify a quality assurance (QA) protocol, and to perform QA for a MR system. For a complete QA protocol, seven principal quality factors (PQFs) were measured. For evaluation of localization and quantification accuracy, two PQFs which are difficult to measure in commercial phantoms, we developed the layered dumbbell-shaped phantom. The performance sensitivity of our phantom was determined as a function of the voxel size on three occasions over ∼1 year. All MRS QA factors were optimized on two different MRI/MRS systems. The correlation between the metabolite signal intensity and the metabolite concentration was verified. The seven principal MRS QA factors studied can be used to evaluate MR spectra as well as to measure the stability of MR systems. © 2009 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 35B: 168–179, 2009</P>
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