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  • 1
    Abstract: OBJECTIVE: Evaluation of absolute radiation exposure values for interventional radiologists (IRs) using a multiaxis interventional flat-panel C-arm cone beam CT (CBCT) system with three-dimensional laser guidance for biopsy in a triple-modality, abdominal phantom. METHODS: In the phantom, eight lesions were punctured in two different angles (in- and out-of-plane) using CBCT. One C-arm CT scan was performed to plan the intervention and one for post-procedural evaluation. Thermoluminescent dosemeters (TLDs) were used for dose measurement at the level of the eye lens, umbilicus and ankles on a pole representing the IRs. All measurements were performed without any lead protection. In addition, the dose-area product (DAP) and air kerma at the skin entrance point was documented. RESULTS: Mean radiation values of all TLDs were 190 microSv for CBCT (eye lens: 180 microS, umbilicus: 230 microSv, ankle: 150 microSv) without a significant difference (p 〉 0.005) between in- and out-of-plane biopsies. In terms of radiation exposure of the phantom, the mean DAP was not statistically significantly different (p 〉 0.05) for in- and out-of-plane biopsies. Fluoroscopy showed a mean DAP of 7 or 6 muGym(2), respectively. C-arm CT showed a mean DAP of 5150 or 5130 muGym(2), respectively. CONCLUSION: In our setting, the radiation dose to the IR was distinctly high using CBCT. For dose reduction, it is advisable to pay attention to lead shielding, to increase the distance to the X-ray source and to leave the intervention suite for C-arm CT scans. ADVANCES IN KNOWLEDGE: The results indicate that using modern navigation tools and CBCT can be accompanied with a relative high radiation dose for the IRs since detector angulation can make the use of proper lead shielding difficult.
    Type of Publication: Journal article published
    PubMed ID: 26370153
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  • 2
    German Medical Science GMS Publishing House; Düsseldorf
    In:  133. Kongress der Deutschen Gesellschaft für Chirurgie; 20160426-20160429; Berlin; DOC16dgch606 /20160421/
    Publication Date: 2016-04-22
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 3
    Electronic Resource
    Electronic Resource
    The environmentalist 16 (1996), S. 297-306 
    ISSN: 1573-2991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Summary A postal survey of 992 secondary students in Hong Kong using the Weigel and Weigel environmental concern scale was conducted to investigate their environmental attitudes which were reflected in a readiness to engage in various pro-environmental behaviours including paper recycling at school and at home and the use of less tissues and plastic bags. The results indicated that students' expressed great concern about the environment and exhibited a strong willingness to participate in pro-environmental behaviour. However, students' overoptimism towards technological development and the perceived importance of the benefits of modern consumer goods were two major factors that contradicted their concern for environment. The Pearson correlation coefficient between environmental concern and comprehensive behavioural intention was strong and positive (0.52). Television and school were cited as major sources of environmental information. Mass media were more important than personal media in the dissemination of environmental information. Female students, older students and students living in private housing held more positive environmental attitudes and were more willing to engage in pro-environmental behaviour. Factor analysis indicated that the environmental concern scale was composed of two factors, personal sacrifice and optimism/issue.
    Type of Medium: Electronic Resource
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