| 1. |
- Ahlström, Håkan, et al.
(author)
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Pulmonary MR angiography with ultrasmall superparamagnetic iron oxide particles as a blood pool agent and a navigator echo for respiratory gating : pilot study
- 1999
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In: Radiology. - 0033-8419 .- 1527-1315. ; 211:3, s. 865-869
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Journal article (peer-reviewed)abstract
- In nine healthy adult volunteers, pulmonary magnetic resonance angiography was performed with the blood pool agent NC100150 injection combined with respiratory gating with a navigator echo. With increasing doses of the contrast agent, higher signal intensities and vessel branch order visualization were achieved. No motion artifacts were seen. The blood pool agent NC100150 injection in combination with respiratory navigator gating permitted acquisition of high-quality MR angiograms of the pulmonary vasculature during continuous breathing.
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| 2. |
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| 3. |
- Steding Ehrenborg, Katarina, et al.
(author)
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Left ventricular AV-plane displacement is preserved with lifelong endurance training and is the main determinant of maximal cardiac output.
- 2015
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In: Journal of Physiology. - 1469-7793. ; 593:23, s. 5157-5166
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Journal article (peer-reviewed)abstract
- Age-related decline in cardiac function can be prevented or postponed by lifelong endurance training. However, effects of normal ageing as well as of lifelong endurance exercise on longitudinal and radial contribution to stroke volume are unknown. The aim of this study was to determine resting longitudinal and radial pumping in elderly athletes, sedentary elderly and young sedentary subjects. Furthermore, we aimed to investigate determinants of maximal cardiac output in elderly.
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| 4. |
- Åkeson, Jonas, et al.
(author)
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Serum CK-MB is useful in diagnosis of acute myocardial infarction after total hip arthroplasty
- 1989
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In: Acta Anaesthesiologica Scandinavica. - 0001-5172. ; 33:6, s. 435-438
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Journal article (peer-reviewed)abstract
- Skeletal muscle trauma and myocardial infarction both increase the serum values of the creatine kinase isoenzyme MB (CK-MB) which may render the diagnosis of perioperative myocardial infarction in major orthopaedic surgery more difficult. The significance of postoperative changes in CK-MB was studied in 30 patients subjected to total hip replacement (THR), and the results were compared to CK-MB in 30 nonsurgical patients with acute myocardial infarction (AMI). AMI patients had significantly higher serum CK-MB values at 24 h than THR patients. However, the highest value after THR exceeded the lowest value in AMI. The results suggest that skeletal muscle release of CK-MB after THR is slight. CK-MB thus also seems useful in the diagnosis of AMI in postoperative patients.
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| 5. |
- Åkeson, M., et al.
(author)
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Picosecond laser pulses improves sensitivity in standoff explosive detection
- 2011
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In: Proc SPIE Int Soc Opt Eng. - : SPIE. - 9780819485915
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Conference paper (peer-reviewed)abstract
- Portendo has in collaboration with FOI, the Swedish Defence Research Agency, developed a world-leading technique of trace detection of explosives at standoff distance using Raman spectroscopy. The technology is further developed in order to enhance the sensitivity of the method and to be able to extend the field of applications. Raman scattering is a well-established technique able to detect substances down to single micrograms at standoff distances, however, one of the obstacles limiting the detection possibilities is interfering fluorescence, originating either from the substance itself or from the surrounding material. One main challenge for this technology is thus to either omit the excitation of the fluorescent process altogether or to be able to separate the two processes and only detect the Raman signal. Due to the difference in the temporal behavior of the two processes - Raman scattering occurs in the order of femtoseconds while fluorescence typically has a lifetime in the order of nanoseconds - one way to theoretically separate them is to limit the measurement to as short time as possible, cutting off most of the emitted fluorescence. The improvement depends on how much of the fluorescence can be omitted without decreasing the Raman signal. Experimentally, we have verified this improvement in signal to noise ratio when using a laser with picosecond pulses instead of nanosecond pulses, which has resulted in an improvement in SNR of up to 7 times for bulk ANFO. These results verify the predicted signal enhancement and suggest higher sensitivity for standoff detection in future systems.
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