Use of a commercial ion chamber detector array for the measurement of high spatial-resolution photon beam profiles.

Use of a commercial ion chamber detector array for the measurement of high spatial-resolution photon beam profiles. J Appl Clin Med Phys. 2018 Oct 04;: Authors: Karimnia V, Belley MD, Rodgers R, Price M Abstract Linear accelerator (linac) commissioning and quality assurance measurements are time-consuming tasks that often require a water tank scanning system to acquire profile scans for full characterization of dosimetric beam properties. To increase efficiency, a method is demonstrated to acquire variable resolution, photon beam profile data using a commercially available ion chamber array (0.5 cm detector spacing). Field sizes of 2 × 2, 5 × 5, 10 × 10, and 15 × 15 cm2 were acquired at depths in solid water of dmax , 5 cm, and 10 cm; additionally, beam profiles for field sizes of 25 × 25 and 40 × 40 cm2 were acquired at 5 cm depth in solid water at x-ray energies of 6 and 23 MV. 1D composite profiles were generated by combining discrete point measurements made at multiple couch positions. The 1D composite profile dataset was evaluated against a commissioning dataset acquired with a 3D water tank scan system utilizing (a) 0.125 cc ion chamber for 5 × 5, 10 × 10, 15 × 15, 25 × 25, and 40 × 40 field sizes and (b) a solid state detector for 2&nb...
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research

Related Links:

Okey, why did i thought of this combination. I work as EM resident in europe and we do not evaluate much CT scans. You can learn self of course. But my thought is - if you are double specialized with rad maybe it can give much to patient flow, you can take quick evaluations self and avoid long with times till you get rad answer. You have good ultrasonography skills and if you want to avoid a bit patient contact can work for exemple 50/50 or 60/40. Maybe it is just me who thinks that way... Combined EM/Diagnostic Radiology?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Combined Residencies Source Type: forums
Magnetic resonance imaging (MRI) could be a successful technology for understanding the severity ofmeningioma, according to a  studyrecently published inClinical Radiology. Determining if meningioma is high grade or low grade can help physicians decide how the tumor should be managed. Researchers from the American University Beirut Medical Center ventured to find out if MRI could help identify the meningioma grade before it ’s removed from the patient, making surgery easier and safer. The researchers analyzed scans of 71 patients who had undergone surgeries to remove intracranial meningiomas at America...
Source: radRounds - Category: Radiology Authors: Source Type: blogs
ConclusionIn breast cancer, D and f values show significant differences according to TSR, and D value is lower in collagen dominant type than in fibroblast dominant or lymphocyte dominant types.
Source: European Journal of Radiology - Category: Radiology Source Type: research
Authors: Bube SH, Hansen RB, Dahl C, Konge L, Azawi N Abstract Objectives: A prospective observational trial to develop and gather validity evidence using Messick's framework for a simulator-based test in TURB. Methods: Forty-nine doctors were recruited from urology departments (Herlev/Gentofte University Hospital, Rigshospitalet Copenhagen University Hospital and Zealand University Hospital Roskilde) and enrolled from April to September 2018. The TURB Mentor™ virtual reality (VR) simulator was assessed at an expert meeting selecting clinically relevant cases and metrics. Test sessions were done on identical ...
Source: Scandinavian Journal of Urology - Category: Urology & Nephrology Tags: Scand J Urol Source Type: research
We present a feasible method to evaluate bacterial biofilm formation in vivo that in the near future can be used to evaluate antibiofilm compounds.
Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
ConclusionsExcessive etching, refiring, and adjustment by airborne-particle abrasion or diamond rotary instrument result in qualitative changes in surface condition. Adjustment by diamond rotary instrument results in appreciable surface damage.
Source: The Journal of Prosthetic Dentistry - Category: Dentistry Source Type: research
Publication date: Available online 30 August 2019Source: Clinical Lymphoma Myeloma and LeukemiaAuthor(s): Zuzan Cayci, Kerem Ozturk, Celalettin Ustun, Aazim K. Omer, Erhan Dincer, Zohar Sachs, Bruce A. Peterson, Michael A. LindenAbstractSarcoidosis has been shown to be associated with increased risk of development of several malignancies including lymphomas. On the other hand, “sarcoid-like reactions” in the absence of other clinical signs of sarcoidosis, have also been described in patients who had been treated with chemotherapy for a wide variety of malignancies. In this article, we report 3 cases who had PET...
Source: Clinical Lymphoma Myeloma and Leukemia - Category: Cancer & Oncology Source Type: research
Publication date: 15 December 2019Source: Materials Letters, Volume 257Author(s): Daixiong Zhang, Qing Xiang, Xueming LiAbstractZeolitic imidazolate framework-67 (ZIF-67) coating was successfully fabricated through electrophoretic deposition (EPD) methods. The study on the electrophoretic deposition behavior indicates isopropanol containing polyethyleneimine is the suitable dispersion system. The N-doped porous carbon coating electrode derived from the pyrolyzed ZIF-67 coating shows a high specific capacitance of 197 F·g−1 at a scan rate of 50 mV·s−1. We believe that this study can pave a new ...
Source: Materials Letters - Category: Materials Science Source Type: research
Publication date: Available online 20 September 2019Source: Materials Chemistry and PhysicsAuthor(s): N. Preda, A. Costas, M. Enculescu, I. EnculescuAbstractThree-dimensional (3D) fibrous networks based on metal oxides were obtained by a bio-inspired approach: the replication of an ecological daily-waste, the eggshell membrane (ESM). The biomorphic process consists in the immersion of the ESM into aqueous solutions containing the metal salt precursors followed by the calcination of the metal ions impregnated ESM. Biomorphic ZnO, CuO and ZnO–CuO composite networks were obtained, their morphological, structural, compos...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
Publication date: Available online 20 September 2019Source: Materials Chemistry and PhysicsAuthor(s): P. Anto Christy, A. John Peter, S.Arumugam, Chang Woo Lee, P. Siva PrakashAbstractFullerenes were synthesized to form sulfonated fullerenes by novel less cost-effective manner using diethyl ether as solvent. The synthesized sulfonated fullerene was extensively characterized by UV–Vis, FT-IR, FT-RAMAN, XRD, SEM HRTEM, XPS, EPR and VSM. FT-IR characterization reveals the presence of functional SO3H groups and FT-Raman characterization confirms the symmetry of the molecule. UV–Vis spectral analysis endorses red sh...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
More News: PET Scan | Physics