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Alina Popescu

Publications and source records attributed to Alina Popescu.

3 recordsLinked to original sources
PubMed2003

Wedge factor dependence with depth and field size for fast neutron beams.

The dependence of the wedge factors (WFs) on field size (FS) and depth for a fast neutron beam has been investigated. In a previous study (Popescu et al 1999 Med. Phys. 26 541), a method was presented that allows a simple and accurate way of calculating the wedge-factor dependence on FS and depth in the case of a photon beam. The validity of a similar approach is tested in the present study for neutron beam dosimetry. The clinical neutron therapy system at the University of Washington (UW) has a flattening filter assembly consisting of two filters: a small field filter and a large field filter. Despite this complication, the approach presented in Popescu et al (1999 Med. Phys. 26 541) can be used to describe the WF dependence on FS and depth (d).

Calibration↗
PubMed2003

The prevalence of Helicobacter pylori infection in western Romania.

UNLABELLED: The aim of this study was to evaluate the prevalence of Helicobacter Pylori (HP) infection in a representative group of workers in Timiş County. MATERIAL AND METHODS: Our study population consisted of 960 employees: 206 F (21.46%) and 754 M (78.54%), mean age 36.8+/-7.6 years (range 18-60 years) from a company in Timişoara, in whom we assessed IgG anti HP antibodies. We standardised our study population for the age and gender distribution of the population in Timiş County and we excluded under 18 and over 60 years age groups which were underrepresented. RESULTS: Antibodies were found in 691 individuals (71.9%). In females, the prevalence of HP infection was 63.1% (130/206) and in males 74.4% (561/754). In the age group 18-30 years - 65.3%, males-67%, females-56.8% (p=0.240); in group 31 - 40 years - 71.6%, males-74.4%, females-63.5% (p=0.025); in group 41 - 50 years - 75%, males - 78%, females-62.5% (p=0.026); and in group 51 - 60 years - 88.7 %, males-87.2 %, females - 100% (p=0.35). After standardisation for age and gender, the prevalence of HP infection in the adult population was 68.5%; in females - 63.8 %, in males - 73.5% (p=0.08). CONCLUSIONS: In a population sample significant for Timiş County, the prevalence of HP infection is 68.5% in the adult population, slightly higher in males than in females (74.4% vs 63.1) (p=0.08), and it has a tendency to increase with ag

Adolescent↗