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1.
Quality assurance of a helical tomotherapy machine 总被引:2,自引:0,他引:2
Fenwick JD Tomé WA Jaradat HA Hui SK James JA Balog JP DeSouza CN Lucas DB Olivera GH Mackie TR Paliwal BR 《Physics in medicine and biology》2004,49(13):2933-2953
Helical tomotherapy has been developed at the University of Wisconsin, and 'Hi-Art II' clinical machines are now commercially manufactured. At the core of each machine lies a ring-gantry-mounted short linear accelerator which generates x-rays that are collimated into a fan beam of intensity-modulated radiation by a binary multileaf, the modulation being variable with gantry angle. Patients are treated lying on a couch which is translated continuously through the bore of the machine as the gantry rotates. Highly conformal dose-distributions can be delivered using this technique, which is the therapy equivalent of spiral computed tomography. The approach requires synchrony of gantry rotation, couch translation, accelerator pulsing and the opening and closing of the leaves of the binary multileaf collimator used to modulate the radiation beam. In the course of clinically implementing helical tomotherapy, we have developed a quality assurance (QA) system for our machine. The system is analogous to that recommended for conventional clinical linear accelerator QA by AAPM Task Group 40 but contains some novel components, reflecting differences between the Hi-Art devices and conventional clinical accelerators. Here the design and dosimetric characteristics of Hi-Art machines are summarized and the QA system is set out along with experimental details of its implementation. Connections between this machine-based QA work, pre-treatment patient-specific delivery QA and fraction-by-fraction dose verification are discussed. 相似文献
2.
Saja H. Hamed Bilal Altrabsheh Tareq Assa’d Said Jaradat Mohammad Alshra’ah Abdulfattah Aljamal Hatim S. Alkhatib Abdul-Majeed Almalty 《Medical engineering & physics》2012,34(10):1471-1476
Different probes are used in dermato-cosmetic research to measure the electrical properties of the skin. The principle governing the choice of the geometry and material of the measuring probe is not well defined in the literature and some device's measuring principles are not accessible for the scientific community. The purpose of this work was to develop a simple inexpensive conductance meter for the objective in vivo evaluation of skin hydration.The conductance meter probe was designed using the basic equation governing wave propagation along Transverse Electromagnetic transmission lines. It consisted of two concentric copper circular electrodes printed on FR4 dielectric material.The performance of the probe was validated by evaluating its measurement depth, its ability to monitor in vitro water sorption–desorption and in vivo skin hydration effect in comparison to that of the Corneometer CM 825. The measurement depth of the probe, 15 μm, was comparable to that of CM 825. The in vitro readings of the probe correlated strongly with the amount of water adsorbed on filter paper. Skin hydration after application of a moisturizer was monitored effectively by the new probe with good correlation to the results of CM 825.In conclusion, a simple probe for evaluating skin hydration was made from off-the-shelf materials and its performance was validated in comparison to a commercially available probe. 相似文献
3.
Yousef Jaradat Morten Birkeland Nielsen Petter Kristensen Khaldoun Nijem Espen Bjertness Rita Bast-Pettersen 《Lancet》2018
Background
Nurses who are exposed to workplace aggression from patients, patient relatives, or colleagues are at risk for mental health disorders and job dissatisfaction. The aim of this study was to assess the prevalence of exposure to workplace aggression and the association between mental distress and job satisfaction in nurses working in the Hebron district of the occupied Palestinian territory.Methods
In this cross-sectional study, nurses were recruited to answer a questionnaire covering sociodemography and workplace aggression (WHO questionnaire), including exposure to physical and verbal aggression and bullying. We assessed mental distress with the General Health Questionnaire (GHQ-30) and job satisfaction with the Generic Job Satisfaction scale. Associations between workplace aggression and mental distress and satisfaction were estimated from χ2 tests and linear regression analyses using Stata/IC10. The study was approved by the ministry of health. Written informed consent was provided by all participants.Findings
In 2012, we recruited 372 registered nurses from the Hebron governorate. 28 (8%) nurses were excluded, and the final sample (n=344) included 213 (62%) women and 131 (38%) men. The prevalence of aggression of any kind was 27%. 17 (5%) nurses had been exposed to physical aggression, 83 (24%) had been exposed to verbal aggression, and 25 (7%) had been exposed to bullying. Men reported a higher prevalence of bullying than women (12% of men vs 5% of women). The prevalence of exposure to physical aggression, verbal aggression, and bullying was highest in young nurses. After adjusting for covariates, nurses exposed to verbal aggression reported 2·9 units (95% CI 0·02 to 5·6; p=0·04) more mental distress than non-exposed nurses. Bullying was associated with a 2·6 unit (95% CI ?5·1 to ?0·14) reduction in job satisfaction score.Interpretation
Nearly a third of nurses in this study reported exposure to some sort of aggression. Nurses exposed to verbal aggression reported more distress than nurses who had never been exposed to verbal aggression. Bullying was associated with reduced job satisfaction. Because the study had a cross-sectional design and both exposure and outcomes were measured using self-report, the results should be interpreted with caution.Funding
The Norwegian Programme for Development, Research and Education (NUFU pro x1 50/2002 and NUFUSM-2008/10232) and The National Norwegian State Education Loan Funds. 相似文献4.
5.
6.
Badria L Amarin Z Jaradat A Zahawi H Gharaibeh A Zobi A 《Archives of gynecology and obstetrics》2003,268(4):340-342
A full-term abdominal pregnancy culminating in the birth of a live healthy baby by laparotomy is described. 相似文献
7.
A.R.M. Radaideh D. Jaradat M.M. Abu-Kalaf M.K. Nusier? 《Current oncology (Toronto, Ont.)》2009,16(5):87-90
Oncogenic osteomalacia is a rare metabolic bone disease characterized by phosphate leakage from the kidney and subsequent hypophosphatemia. It is caused by a phosphaturic factor produced by certain tumours. Removal of such tumours can completely cure the condition. Here, we report the case of a patient who was crippled with oncogenic osteomalacia. Extensive study revealed a tumour deeply located in the pelvis; removal of the tumour resulted in complete recovery. The tumour was identified as a mesenchymal tumour (mixed connective-tissue variant). The diagnostic evaluation, differential diagnosis, and treatment are discussed. 相似文献
8.
Jumana A. Karasneh Khansa T. Ababneh Anas H. Taha Muna S. Al‐Abbadi Nour al‐dain S. Marzouka Sameh M. Jaradat Martin H. Thornhill 《European journal of oral sciences》2013,121(6):551-558
Vitamin D acts through binding with vitamin D receptor (VDR) and is responsible for regulating bone metabolism and mineralization; it also suppresses the immune system. The aim of this study was to investigate if VDR gene polymorphisms are associated with chronic periodontitis (CP) and aggressive periodontitis (AgP) in a Jordanian population. A total of 99 patients with CP, 63 patients with AgP, and 126 controls were genotyped using PCR‐restriction fragment length polymorphism (RFLP) for BsmI, ApaI, and TaqI single nucleotide polymorphisms (SNPs). The association was determined after correcting for confounding factors using multivariate logistic regression analysis. Estimation of haplotype frequencies was carried out using the EH program, and haplotypes were constructed using the phase 2.1 program. After correcting for confounding factors, multivariate logistic regression analysis revealed that inheritance of the BsmI bb genotype or the ApaI aa genotype was associated with increased risk of developing CP (OR = 2.4 and OR = 3.4, respectively) but with reduced risk of developing AgP (OR = 0.4 and OR = 0.3, respectively). This was further supported by association of the ba haplotype with CP but not with AgP. This study supports an association of VDR gene polymorphisms with CP and AgP in a Jordanian population; however, the pattern of association was different between the two diseases. 相似文献
9.
The calculation of shielding barrier thicknesses for radiation therapy facilities according to the NCRP formalism is based on the use of broad beams (that is, the maximum possible field sizes). However, in practice, treatment fields used in radiation therapy are, on average, less than half the maximum size. Indeed, many contemporary treatment techniques call for reduced field sizes to reduce co-morbidity and the risk of second cancers. Therefore, published tenth value layers (TVLs) for shielding materials do not apply to these very small fields. There is, hence, a need to determine the TVLs for various beam modalities as a function of field size. The attenuation of (60)Co gamma rays and photons of 4, 6, 10, 15, and 18 MV bremsstrahlung x ray beams by concrete has been studied using the Monte Carlo technique (MCNP version 4C2) for beams of half-opening angles of 0 degrees , 3 degrees , 6 degrees , 9 degrees , 12 degrees , and 14 degrees . The distance between the x-ray source and the distal surface of the shielding wall was fixed at 600 cm, a distance that is typical for modern radiation therapy rooms. The maximum concrete thickness varied between 76.5 cm and 151.5 cm for (60)Co and 18 MV x rays, respectively. Detectors were placed at 630 cm, 700 cm, and 800 cm from the source. TVLs have been determined down to the third TVL. Energy spectra for 4, 6, 10, 15, and 18 MV x rays for 10 x 10 cm(2) and 40 x 40 cm(2) field sizes were used to generate depth dose curves in water that were compared with experimentally measured values. 相似文献
10.
F. Mayyas R. Jaradat K.H. Alzoubi 《Nutrition, metabolism, and cardiovascular diseases : NMCD》2018,28(6):592-599