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- Eriksson, Ola, 1967-, et al.
(författare)
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In vitro evaluation of brain lesioning electrodes (Leksell) using a computer-assisted video system
- 1999
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Ingår i: Neurological Research. - 0161-6412 .- 1743-1328. ; 21:1, s. 89-95
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Tidskriftsartikel (refereegranskat)abstract
- Radiofrequency (RF) generated thermal brain lesions are widely used in functional neurosurgery. The size, shape and development of the lesions depends on system parameter settings and the electrode configuration. Difficulties in studying the effect of these factors in vivo stimulated us to develop an in vitro system for standardized comparison between different electrodes and physical parameters. A computer-assisted video system was set-up allowing continuous video recording of RF-generated coagulations in either a standard albumin solution or in the fresh white of a hen's egg as transparent test substrates. Ten lesions were made with each test electrode (two bipolar and three monopolar) in each of the two substrates at 70 degrees, 80 degrees and 90 degrees C (t = 60 sec). Due to the better homogeneity the lesions in the albumin solution were much more regular and reproducible. This made it possible to calculate the size (width 2.2 +/- 0.1 to 5.3 +/- 0.1 mm and length 3.0 +/- 0.1 to 8.7 +/- 0.3 mm) as well as the volume (8.5 +/- 1.4 mm3 to 133.5 +/- 26.8 mm3). It is concluded that this in vitro system offers a reproducible way to study and document the effect of different electrode configurations and RF-generator settings on the formation of a heat lesion. Even if the results are not directly applicable to the living human brain they give an estimate of the form and size of a coagulation lesion and can be of value for standardized comparisons between different electrodes.
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| 6. |
- Eriksson, Karin
(författare)
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Begravningsplatser i Västerbotten. En inventering
- 1991
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Ingår i: Bebyggelsehistorisk tidskrift. - : Föreningen Bebyggelsehistorisk tidskrift. - 0349-2834 .- 2002-3812. ; :22, s. 181-188
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Tidskriftsartikel (refereegranskat)
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| 7. |
- Eriksson, Karin
(författare)
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Byggnadsvård i Västerbotten
- 1991
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Ingår i: Kulturmiljövård. - Stockholm : Riksantikvarieämbetet. - 1100-4800. ; :5-6, s. 14-18
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- I Västerbottens län finns glädjande exempel på hur statlig byggnadsvård kan bedrivas. I nära samarbete med museerna har länsantikvarien under de senaste åren systematiskt arbetat med inriktning på riksintressemiljöernas byggnadsbestånd. Arbetet har varit uppskattat inte minst i kommunerna där nedläggningen av jordbruket varit förödande för landskapet.
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| 8. |
- Eriksson, Ola, 1967-, et al.
(författare)
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A comparison between in vitro studies of protein lesions generated by brain electrodes and finite element model simulations
- 1999
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Ingår i: Medical and Biological Engineering and Computing. - 0140-0118 .- 1741-0444. ; 37:6, s. 737-741
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to develop a finite element model for simulation of the thermal characteristics of brain electrodes and to compare its performances with an in vitro experimental albumin model. Ten lesions were created in albumin using a monopolar electrode connected to a Leksell Neuro Generator and a computer-assisted video system was used to determine the size of the generated lesions. A finite element model was set up of the in vitro experiments using the same thermal properties. With a very simple heat source applied to the finite element model in the proximity of the upper part of the tip, a good agreement (no deviations in width and distance from tip but a deviation in length of −1.6 mm) with the in vitro experiments (width 4.6±0.1 mm and length 7.4±0.1 mm) was achieved when comparing the outline of the lesion. In addition, a gelatinous albumin-model was set up and compared to computer simulations resulting in deviations in width of −0.4 mm, length of −2.2 mm and distance from the tip of −0.1 mm. Hence, the utilisation of finite element model simulations may be a useful complement to in-vitro experiments.
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| 10. |
- Eriksson, Ola, 1967-, et al.
(författare)
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In-vitro size estimation of protein clots generated by brain electrodes
- 1998
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Ingår i: Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1998. - Hong Kong : IEEE. ; , s. 1783-
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Konferensbidrag (refereegranskat)abstract
- A method for in-vitro size estimation of protein clots generated by brain electrodes is presented. Radiofrequency generated thermal brain lesions are widely used in functional neurosurgery and in-vitro tests are used to confirm the electrodes' ability to generate lesions. To be able to estimate the size of protein clots generated in-vitro by brain electrodes, a computer-assisted video system was set up. The size estimation is carried out by software using two captured images of the protein clot. The “true” length and width (9.5 mm) of a sphere as measured with a slide-caliper differed at the most 0.5 mm (5%) and 0.3 mm (3%) respectively, all random errors fall within 2s.d
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| 12. |
- Kulneff-Eriksson, Karin
(författare)
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On 'have' in Ancient Greek. An investigation on echo and the construction einai with a dative as expressions for 'have'.
- 1999
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This book deals with ’have’ in ancient Greek. Two different types of ’have’-constructions were used, viz., on the one hand, the active transitive verb ἔχω and, on the other hand, the verb εἶναι, ’be’, with a complement in the dative case (here called the ἔστι μοι construction). A transitive ’have’ does not seem to be of Proto-Indo-European origin but rather an innovation in separate Indo-European languages. In Greek the attestation for ἔχω is very early, and both types of ’have’ constructions existed side by side for a very long time. Here an attempt has been made to investigate the way in which ἔχω has been used, during the course of time and also as compared to ἔστι μοι. Over time ἔχω gains ground at the cost of ἔστι μοι, irrespective of whether the possession is concrete or not. In Homer and Herodotus ἔστι μοι is more frequent than ἔχω when the possession is non-concrete, in Euripides, Xenophon, and Plato ἔχω dominates, and in Isocrates there is a strong dominance of ἔχω in these cases; however, this dominance is practically always less marked than when the possession is concrete, non-animate. The supposed background of ἔχω, viz.that it meant ’hold’ in an earlier period (it means ’hold’ in some cases in the older texts), may explain the fact that there is a higher proportion of concrete, non-animate, possessions than of non-concrete possessions connected with ἔχω. This fits in well with the fact that ἔχω, besides denoting a very vague ’have’, had shades of meanings such as the metaphorical ’hold in one’s power’ or ’contain’, shades of meanings which can never be part of the meaning of ἔστι μοι. However, there are restrictions on the very vague and empty ἔστι μοι, in that it is not often used when the possessor is the element in focus in the clause. Ἔχω, on the other hand, may well be used when either the possessor or the possession has focus function. Simultaneously with its expansion ἔχω becomes vaguer and the shades of meanings which discriminated it from ἔστι μοι disappear. In the latest of the investigated texts ἔχω dominates very strongly over ἔστι μοι.
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| 13. |
- Unge, Peter, et al.
(författare)
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Amoxicillin added to omeprazole prevents relapse in the treatment of duodenal ulcer patients
- 1993
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Ingår i: European Journal of Gastroenterology and Hepathology. - 0954-691X .- 1473-5687. ; 5:5, s. 325-332
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To evaluate two different therapies, omeprazole/amoxicillin versus omepra-zole alone, in the treatment of duodenal ulcer patients with respect to eradication of Helicobacter pylori and time in remission during a 6-month follow-up after cessation of therapy.Design: Double-blind, randomized, parallel groups.Setting: Outpatient referrals in nine Swedish centres.Patients: This study included 248 patients with active duodenal ulcer.Main outcome measures: Endoscopic and symptomatic evaluation of time in remission. Culture, histology and serology for determination of H. pylori status.Results: Eradication of H. pylori was 54 compared with 4% and the proportion of patients in remission at 6 months was 70 compared with 36% in the omeprazole/amoxicillin treated group versus the group treated with omeprazole alone. Of the patients who became H. pylori-negative, 84% were in remission throughout the study.Conclusion: H. pylori is an almost obligate prerequisite for duodenal ulcer disease. Amoxicillin added to omeprazole nearly doubled the proportion of patients in remission at 6 months follow-up. The eradication rate of H. pylori in patients with excellent compliance was 74%.
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