Search Results - "Van Aswegen, A"

The effect of visible light on the dissolution of natural chalcopyrite (CuFeS2) in sulphuric acid solutions by Crundwell, F.K., Van Aswegen, A., Bryson, L.J., Biley, C., Craig, D., Marsicano, V.D., Keartland, J.M.

“…The effect of visible light on the anodic dissolution of a natural sample of chalcopyrite in 0.3M sulphuric acid using a rotating disc technique has been…”
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Production of radioactive quality assurance phantoms using a standard inkjet printer by van Staden, J A, du Raan, H, Lötter, M G, van Aswegen, A, Herbst, C P

“…This note proposes the use of a standard inkjet printer to produce radioactive (99m)Tc phantoms that can be used for routine quality control of gamma cameras…”
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The effect of ethical values on transformational leadership and ethical climate in organisations by Engelbrecht, A. S, Van Aswegen, A. S, Theron, C. C

“…Ethical leaders are ultimately responsible for developing a strong and sustainable ethical climate in organisations. Ethical values and the ability to…”
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Airflow distribution with manual hyperinflation as assessed through gamma camera imaging: a crossover randomised trial by van Aswegen, H, van Aswegen, A, Raan, H. Du, Toit, R. Du, Spruyt, M, Nel, R, Maleka, M

“…Abstract Objectives Manual hyperinflation (MHI) has been shown to improve lung compliance, reduce airway resistance, and enhance secretion removal and peak…”
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The relationship between administered radiopharmaceutical activity in myocardial perfusion scintigraphy and imaging outcome by Robinson, C. N., van Aswegen, A., Julious, S. A., Nunan, T. O., Thomson, W. H., Tindale, W. B., Tout, D. A., Underwood, S. R.

“…Introduction Lower radiopharmaceutical activities are used for myocardial perfusion scintigraphy (MPS) in the UK than in other countries. There is no evidence…”
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Staff radiation doses during eight years in a nuclear medicine radiopharmacy by Jansen, S E, Van Aswegen, A, Lötter, M G, Herbst, C P, Otto, A C

“…It is important that staff radiation doses be kept 'as low as reasonably achievable' (ALARA). Staff working in the radiopharmacy and nursing staff responsible…”
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Evaluation of an uncollimated printed paper transmission source used under scatter limiting conditions by van Staden, J.A, du Raan, H, Lötter, M.G, Herbst, C.P, van Aswegen, A, Rae, W.I.D

“…Abstract Transmission sources used for image attenuation correction, allowing image quantification, are collimated to reduce scatter. We propose the same…”
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Radiation dose estimates of 186Re-hydroxyethylidene diphosphonate for palliation of metastatic osseous lesions: an animal model study by van Aswegen, A, Roodt, A, Marais, J, Botha, J M, Naudé, H, Lötter, M G, Goedhals, L, Doman, M J, Otto, A C

“…A common complication in patients with breast or prostate cancer is bone metastases causing pain. New radionuclide therapy methods have recently been proposed…”
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Production of radioactive quality assurance phantoms using a standard inkjet printer by van Staden, J.A, du Raan, H, Lötter, M.G, van Aswegen, A, Herbst, C.P, Willemse, C.A

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Effect of chopped light on the dissolution and leaching of chalcopyrite by Crundwell, F.K., Bryson, L.J., van Aswegen, A., Knights, B.D.H.

“…•Photo-response to chopped light is observed without increase in temperature.•Photo-response is dependent on potential.•Photo-response due to semiconducting…”
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Implementation of a Tc-99m and Ce-139 scanning line source for attenuation correction in SPECT using a dual opposing detector scintillation camera by du Raan, H., du Toit, P. D., van Aswegen, A., Lötter, M. G., Herbst, C. P., van der Walt, T. N., Otto, A. C.

“…Image degradation during single photon emission computed tomography (SPECT) due to attenuation and Compton scatter of photons can cause clinical image…”
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Evaluation of samarium-153 and holmium-166-EDTMP in the normal baboon model by Louw, W.K.A., Dormehl, I.C., van Rensburg, A.J., Hugo, N., Alberts, A.S., Forsyth, O.E., Beverley, G., Sweetlove, M.A., Marais, J., Lötter, M.G., van Aswegen, A.

“…Bone-seeking radiopharmaceuticals such as ethylenediaminetetramethylene phosphonate (EDTMP) complexes of samarium-153 and holmium-166 are receiving…”
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Left ventricular function evaluation using radionuclide methods in the intensive coronary care unit by van Aswegen, A, Otto, A C, Herbst, C P, Marx, J D, Kleynhans, P H, Lötter, M G, Minnaar, P C

“…We describe an adapted first-transit (FT) technique to perform left ventricular ejection fraction (LVEF) measurements on patients with Swan-Ganz catheters in…”
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The Channel Ratio Method of Scatter Correction for Radionuclide Image Quantitation by Pretorius, P. Hendrik, van Rensburg, Ado J, Aswegen, Andries van, Lotter, Mattheus G, Serfontein, Dawid E, Herbst, Charles P

“…The accuracy of quantitation of radionuclide distributions in human tissue with the scintillation camera is decreased by attenuation and scatter of photons. If…”
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Absolute left ventricular volume changes after sublingual nitroglycerine and nifedipine intervention by Otto, A.C., Herbst, C.P., van Aswegen, A., Lotter, M.G., Minnaar, P.C., Marx, J.D. & Kleynhans, P.H.T.

“…The haemodynamic effects of two vasodilators, subIingual nitroglycerine and nifedipine, on absolute end-diastolic volume, end-systolic volume, stroke volume…”
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Temporal resolution requirements for left ventricular time-activity curves by van Aswegen, A, Alderson, P O, Nickoloff, E L, Householder, D F, Wagner, Jr, H N

“…To investigate framing rate requirements for left ventricular (LV) time-activity curves, ECG-synchronized blood pool studies of 33 patients were compared to…”
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Measurement of plasma volume using99 Tcm-labelled DMP-HSA by DU RAAN, H, LÖTTER, M G, HARRIS, G W, VAN ASWEGEN, A, OTTO, A C, NEL, M G, BADENHORST, P N, VERBEKE, K A, VERBRUGGEN, A M

“…Red cell volume (RCV) and plasma volume (PV) measurements are performed routinely in nuclear medicine departments to diagnose a number of haematological…”
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Traumatic aorta-vena cava fistula detected with radionuclide angiocardiography - a case report by Theron, H. du T., Otto, A.C., van Aswegen, A., Herbst, C.P., Kleynhans, P.H.T., Lotter, M.G., Minnaar, P.C. & Marx, J.D.

“…Diagnosis of a traumatic aorta-superior vena cava fistula in a 54-year-old man is reported, and the value of radionuclide angiocardiography in detecting and…”
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Variation in left ventricular ejection fraction determination at rest and during exercise by van Aswegen, A., Herbst, C.P., Lotter, M.G., Otto, A.C., Kleynhans, P.H.T. & Minnaar, P.C.

“…The results of multi-gated blood pool imaging (MBPI) for determination of left ventricular ejection fraction (LVEF) in 48 patients at rest and during exercise…”
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Absolute radionuclide concentration measurement using maximum-likelihood expectation-maximization iterative reconstruction, attenuation, and scatter correction by Pretorius, P.H., van Aswegen, A., Lotter, M.G.

“…The aim of this study was to evaluate the accuracy with which radionuclide concentration could be measured after implementation of the channel ratio (CR)…”
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