Design and Medical Applications of a Platform for Image-Guided Non-Invasive Brain Delivery of Magnetic Particles.

Author(s):  
J. Benlloch ◽  
I. Weinberg
2018 ◽  
Vol 9 ◽  
pp. 1-5 ◽  
Author(s):  
Irving N. Weinberg ◽  
Lamar O. Mair ◽  
Sahar Jafari ◽  
Sagar Chowdhury ◽  
James Baker-McKay ◽  
...  

Plant Methods ◽  
2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Yunjeong Yang ◽  
Ji Eun Kim ◽  
Hak Jin Song ◽  
Eun Bin Lee ◽  
Yong-Keun Choi ◽  
...  

Abstract Background Water content variation during plant growth is one of the most important monitoring parameters in plant studies. Conventional parameters (such as dry weight) are unreliable; thus, the development of rapid, accurate methods that will allow the monitoring of water content variation in live plants is necessary. In this study, we aimed to develop a non-invasive, radiofrequency-based monitoring system to rapidly and accurately detect water content variation in live plants. The changes in standing wave ratio (SWR) caused by the presence of stem water and magnetic particles in the stem water flow were used as the basis of plant monitoring systems. Results The SWR of a coil probe was used to develop a non-invasive monitoring system to detect water content variation in live plants. When water was added to the live experimental plants with or without illumination under drought conditions, noticeable SWR changes at various frequencies were observed. When a fixed frequency (1.611 GHz) was applied to a single experimental plant (Radermachera sinica), a more comprehensive monitoring, such as water content variation within the plant and the effect of illumination on water content, was achieved. Conclusions Our study demonstrated that the SWR of a coil probe could be used as a real-time, non-invasive, non-destructive parameter for detecting water content variation and practical vital activity in live plants. Our non-invasive monitoring method based on SWR may also be applied to various plant studies.


2012 ◽  
Vol 98 (5) ◽  
pp. 630-635 ◽  
Author(s):  
Ferrat Dincoglan ◽  
Murat Beyzadeoglu ◽  
Omer Sager ◽  
Kaan Oysul ◽  
Sait Sirin ◽  
...  

Brachytherapy ◽  
2013 ◽  
Vol 12 ◽  
pp. S16 ◽  
Author(s):  
Jaroslaw T. Hepel ◽  
Jessica R. Hiatt ◽  
Sandra Sha ◽  
Kara L. Leonard ◽  
Theresa A. Graves ◽  
...  

2007 ◽  
Vol 34 (6Part5) ◽  
pp. 2375-2375
Author(s):  
J Chang ◽  
W O'Meara ◽  
J Mechalakos ◽  
Y Yamada ◽  
D Lovelock ◽  
...  

2006 ◽  
Vol 33 (6Part7) ◽  
pp. 2066-2066 ◽  
Author(s):  
F Hacker ◽  
F Rosca ◽  
S Friesen ◽  
P Zygmanski ◽  
N Ramakrishna

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Julian Mangesius ◽  
Thomas Seppi ◽  
Rocco Weigel ◽  
Christoph Reinhold Arnold ◽  
Danijela Vasiljevic ◽  
...  

Abstract Background The present study investigates the intrafractional accuracy of a frameless thermoplastic mask used for head immobilization during stereotactic radiotherapy. Non-invasive masks cannot completely prohibit head movements. Previous studies attempted to estimate the magnitude of intrafractional inaccuracy by means of pre- and postfractional measurements only. However, this might not be sufficient to accurately map also intrafractional head movements. Materials and methods Intrafractional deviation of mask-fixed head positions was measured in five patients during a total of 94 fractions by means of close-meshed repeated ExacTrac measurements (every 1.4 min) conducted during the entire treatment session. A median of six (range: 4 to 11) measurements were recorded per fraction, delivering a dataset of 453 measurements. Results Random errors (SD) for the x, y and z axes were 0.27 mm, 0.29 mm and 0.29 mm, respectively. Median 3D deviation was 0.29 mm. Of all 3D intrafractional motions, 5.5 and 0.4% exceeded 1 mm and 2 mm, respectively. A moderate correlation between treatment duration and mean 3D displacement was determined (rs = 0.45). Mean 3D deviation increased from 0.21 mm (SD = 0.26 mm) in the first 2 min to a maximum of 0.53 mm (SD = 0.31 mm) after 10 min of treatment time. Conclusion Pre- and post-treatment measurement is not sufficient to adequately determine the range of intrafractional head motion. Thermoplastic masks provide both reliable interfractional and intrafractional immobilization for image-guided stereotactic hypofractionated radiotherapy. Greater positioning accuracy may be obtained by reducing treatment duration (< 6 min) and applying intrafractional correction. Trial registration Clinicaltrials.gov, NCT03896555, Registered 01 April 2019 - retrospectively registered.


2010 ◽  
Vol 148 (1) ◽  
pp. e68-e70
Author(s):  
M. Visscher ◽  
M. Sobik ◽  
B. ten Haken ◽  
H. Rogalla

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