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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 301 to 310 of 378 (0.042 seconds)Spelling suggestions: "subject:"chealth ciences - radiology"" "subject:"chealth ciences - adiology""
| 301 |
Precise rubidium-82 infusion system for cardiac perfusion measurement using three-dimensional positron emission tomographyKlein, Ran January 2005 (has links)
Introduction. Quantitative myocardial perfusion measurements using positron emission tomography (PET) can be improved by introducing diagnostic tracers at a constant rate of activity. 82Rb can be produced cost effectively by eluting a 82Sr/82Rb generator with saline; however, it exhibits an undesirable, but reproducible, activity rate variation. Previously, a threshold-comparison algorithm controlled saline flow through either generator or bypass line using an on/off valve, to simulate constant-activity elutions. Methods. In this work a mechanical system and control software is developed to control tracer infusion. The valve is cycled at 5Hz and its duty-cycle controlled by a predictive-corrective algorithm in order to reduce measurable activity rate fluctuations. Results. Precision increases (RMS error improves from >40% to ∼14%) as does the range of relative activities that can be eluted from the generator. Conclusion. The proposed method demonstrates superior precision and flexibility. However, further tests must be conducted to ensure that the precision of the system does not deteriorate over time.
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| 302 |
Inverse treatment planning by simulated annealing optimization of a dose-volume objective functionSham, Edwin O. H. January 2001 (has links)
No description available.
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| 303 |
The use of endovaginal sonography and Doppler ultrasound in the detection of endometrial carcinoma in women presenting with postmenopausal bleeding /Reinhold, Caroline. January 1999 (has links)
No description available.
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| 304 |
Development of a portal imager and of tools for radiation treatment verificationWang, Hui, 1964- January 1996 (has links)
No description available.
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| 305 |
Photoneutrons and induced activity from medical linear acceleratorsWang, Yi Zhen, 1965- January 2004 (has links)
No description available.
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| 306 |
Validation of Monte Carlo techniques for 3D-CRT of lung cancer patients and comparative evaluation of treatment plansDai, Jinxian January 2005 (has links)
No description available.
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| 307 |
Physical parameters of narrow photon beams in radiosurgerySixel, Katharina E. (Katharina Elisabeth) January 1990 (has links)
No description available.
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| 308 |
Projecting the lifetime risk of breast and thyroid cancer from exposure to diagnostic ionizing radiation for adolescent idiopathic scoliosisLevy, Adrian R., 1962- January 1992 (has links)
No description available.
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| 309 |
A multimodality image fusion and localisation system for radiosurgery treatments of arteriovenous malformations /Bercier, Yanic January 2000 (has links)
No description available.
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| 310 |
Viability of an isocentric cobalt-60 teletherapy unit for stereotactic radiosurgeryPoffenbarger, Brett A. January 1998 (has links)
No description available.
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