Leuco crystal violet-Pluronic F-127 3D radiochromic gel dosimeter.

Leuco crystal violet-Pluronic F-127 3D radiochromic gel dosimeter. Phys Med Biol. 2019 Jul 04;: Authors: Kouvati K, Jaszczak M, Papagiannis P, Kadlubowski S, Wach R, Maras P, Dudek M, Kozicki M Abstract This work reports results related to the manufacturing and optimisation of a leuco crystal violet (LCV)-Pluronic F-127 radiochromic gel dosimeter suitable for 3D radiotherapy dosimetry. A feature of this gel is that the natural gelatine polymer, which is most often used as a matrix in 3D dosimeters, is substituted with Pluronic F-127 synthetic copolymer (poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide). Pluronic F-127 ensures a higher transparency than gelatine, which may be beneficial for optical computed tomography readout, and improves the thermal properties in the temperature range above ~30 °C at which the gelatine physical gel converts to a solution. The optimal composition obtained comprises 2 mM LCV, 4 mM 4-(1,1,3,3-tetramethylbutyl)phenyl-polyethylene glycol (Triton X-100), 17 mM trichloroacetic acid (TCAA) and 25% Pluronic F-127. Its main dose-response features are 4‒150 Gy linear dose range (150 Gy was the maximal dose applied to gels in this work), 0.0070 Gy-1 cm-1 dose sensitivity (derived from absorbance (600 nm)=f(dose) for 6 MeV electrons, 0.88(3) Gy/s and 0.0156 Gy-1 cm-1 derived from optical density (Δμ)=f(dose) for 6 MV x-rays, 0.1010 Gy/s), low initial colour (initial absorbance = 0.0429) and a...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research

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CONCLUSIONS: The presented algorithm can achieve image quality superior to that of the MLEM and MLEM-TV approaches in terms of the preservation of fine structure and the suppression of undesired artifacts and noise, indicating its useful potential for low-sampled data in PET imaging. PMID: 31381539 [PubMed - as supplied by publisher]
Source: Journal of X-Ray Science and Technology - Category: Radiology Tags: J Xray Sci Technol Source Type: research
ConclusionA careful assessment with high clinical suspicion along with CT Scan is the best way to diagnose extra pericardial tamponade cause by sternal fracture.
Source: International Journal of Surgery Case Reports - Category: Surgery Source Type: research
CONCLUSIONS: The proposed mecanum iCT system achieved the improved flexible mobility and has potential to better serve as a useful imaging tool in the clinical intraoperative setting. PMID: 31356225 [PubMed - as supplied by publisher]
Source: Journal of X-Ray Science and Technology - Category: Radiology Tags: J Xray Sci Technol Source Type: research
CONCLUSIONS: Semi-empirical linearization of X-ray projection data with custom calibration phantoms allows accurate measurements to be obtained on the radiodense samples after applying the proposed correction method on biomedical micro-CT images. PMID: 31356224 [PubMed - as supplied by publisher]
Source: Journal of X-Ray Science and Technology - Category: Radiology Tags: J Xray Sci Technol Source Type: research
ConclusionLimy bile is a rare clinical entity of unknown etiology but obstruction of the cystic duct may be the most important step in its occurrence. The condition needs cholecystectomy as in most of the cases it is associated with gall stones. There are no reported long term sequelae and long term follows up is not recommended.
Source: International Journal of Surgery Case Reports - Category: Surgery Source Type: research
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Source: Journal of Wrist Surgery - Category: Orthopaedics Authors: Tags: Survey or Meta-Analysis Source Type: research
CT scans have revolutionised the fight against human illness by creating three-dimensional images of the body's inner workings. Such scans, however, can deliver high doses of radiation. Now EU-funded researchers have built special cameras that limit radiation while delivering images vital for patient health.
Source: EUROPA - Research Information Centre - Category: Research Source Type: news
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Source: Medical Device Recalls - Category: Medical Devices Source Type: alerts
Specially trained beagles could one day detect mesothelioma by scent, according to the lead researcher of a recent study detailing the dog breed’s stunning accuracy with lung cancer. Dr. Thomas Quinn, clinical professor at the Lake Erie College of Osteopathic Medicine, believes the dogs could be equally effective with pleural mesothelioma, a rare cancer caused by asbestos exposure. “Absolutely, this could work with mesothelioma. There is no reason why it wouldn’t,” Quinn told The Mesothelioma Center at Asbestos.com. “That is another cancer with strong potential for this to work well.” Th...
Source: Asbestos and Mesothelioma News - Category: Environmental Health Authors: Source Type: news
Authors: Chen M, Wang D, Cai N, Xia D, Zou J, Yu H Abstract Multi-source computed tomography (CT) imaging has unique technical advantages not only for dynamic objects, but also for large-size objects by designing its imaging scan mode. Using the triple-source fan-beam imaging scan mode under three circular trajectories with two different radii, we in this study developed and analyzed theoretically several exact reconstruction algorithms in terms of full-scan and short-scan for three sets of truncated projection data. This triple-source scan configuration in different radii cases is easier to be simulated by a singl...
Source: Journal of X-Ray Science and Technology - Category: Radiology Tags: J Xray Sci Technol Source Type: research
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