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- Aitken, Candice L., et al.
(författare)
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Comparison of three methods used for fusion of SPECT-CT images of liver matastases
- 1998
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Ingår i: Fusion98, International Conference on Multisource-Mulltisensor Information Fusion. - : CSREA Press. - 1892512009 ; , s. 435-442
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Konferensbidrag (refereegranskat)abstract
- We compare three methods for fusing SPECT-CT images: ImageMatch - an automatic three-dimensional/two-dimensional method developed by Focus Imaging; IBM Visualization Data Explorer - a three-diemensional interactive method developed by Internation Business Machines, Inc.; and qsh - an interactive three-dimensional/two-dimensional method developed at New York University. While many fusion methods have proved successful for registering brain images, most methods have been less successful for thoracic and abdominal images. We use images of liver metastases obtained with a radiolabeled breast tumor-directed antibody to illustrate the strengths and weakness of the methods reviewed. The images used are typical clinical images from eigth patients. We conclude that an optimal image fusion program should combine the strengths of each of the methods reviewed.
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| 2. |
- Sundeman, H., et al.
(författare)
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The effects of desflurane on cardiac function as measured by conductance volumetry in swine
- 1998
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Ingår i: Anesthesia and Analgesia. - : Ovid Technologies (Wolters Kluwer Health). - 0003-2999 .- 1526-7598. ; 87:3, s. 522-8
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the investigation was to assess the effects of desflurane (DES) on left ventricular heart function during basal barbiturate anesthesia in a closed-pericardium, closed-chest acute swine model. The study was performed in 11 normoventilated adult pigs. Hemodynamic measurements were obtained using arterial, central venous, and pulmonary artery catheters, as well as a conductance volumetry and tip manometry catheter placed in the left ventricle. Hemodynamic measurements were recorded during basal pentobarbital anesthesia and with the addition of 1%, 2%, 4%, and 6% DES. DES dose-dependently decreased mean arterial pressure, systemic vascular resistance, left ventricular end-systolic pressure, dP/dtMAX and dP/dtMIN. At doses >1%, decreases in CO, stroke volume, ejection fraction, end-systolic elastance, preload recruitable stroke work, preload adjusted maximal power, and peak filling rate were observed. Heart rate decreased at 4% and 6% DES. Isovolumetric relaxation time increased only at 6% DES. We conclude that smaller doses of DES have a significant cardiodepressive effect in the setting of barbiturate infusion, as measured by conductance volumetry. IMPLICATIONS: Desflurane, in very small doses, depressed cardiac function during pentobarbital anesthesia with ketamine and benzodiazepine premedication in swine, as assessed by conductance volumetry and left ventricular pressure and volume relationship analysis. These results suggest that desflurane, in combination with certain anesthetics, can be cardiodepressive even in very small doses.
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| 3. |
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| 4. |
- White Sjölander, Peta, 1961-
(författare)
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A study of the effects of vocal intensity variation on children’s voices using long-term average spectrum (LTAS) analysis
- 1998
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Ingår i: Logopedics, Phoniatrics, Vocology. - : Informa UK Limited. - 1401-5439 .- 1651-2022. ; 23:3, s. 111-120
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Tidskriftsartikel (refereegranskat)abstract
- Studies of adult voices have shown that, as vocal intensity is increased, the partials at higher frequencies gain more than those at lower frequencies. Investigations involving children's normal productions are uncommon, however, and there is, consequently, little knowledge of how children's vocal function differs from that of adults. Using LTAS analysis, this study investigates the effects of vocal intensity variation on the voices of 10-year-old schoolchildren singing in soft, mid and loud voice. A frequency-dependent gain factor was calculated which showed the increase in level to have been greater for partials at higher than at lower frequencies for these children. Also, gain within frequency bands was often different between boys and girls, although this was not demonstrated statistically.
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