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Sökning: WFRF:(Bahar Gogani Jalil)

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1.
  • Bahar Gogani, Jalil, 1967-, et al. (författare)
  • Assessment of correlated dose and sensitivity profiles on a multi-slice CT scanner
  • 2005
  • Ingår i: Radiation Protection Dosimetry. - : Oxford University Press (OUP). - 0144-8420 .- 1742-3406. ; 114:1-3, s. 332-336
  • Tidskriftsartikel (refereegranskat)abstract
    • In the case of computed tomography (CT) scanners as well as other imaging techniques utilising ionising radiation, it is imperative that radiation is confined to the sensitive part of the image detector. Assuring this for a CT scanner requires detailed information about the scanner dose and sensitivity profiles and their spatial correlation. The profiles should ideally be co-centric and tightly fit to each other. Ensuring this inherent performance of the scanner can be seen as one of the fundamental steps in optimising diagnostic examinations with CT. A measurement device using a dedicated liquid ionisation chamber is employed to investigate the performance of a Toshiba Aquilion 16 scanner in this aspect. Dose profile and sensitivity profile pairs for four collimations are presented where each pair of profiles are spatially correlated to each other. The measurement device can be applied to any scanner for fast and accurate assessment of dose and sensitivity profiles and their spatial correlation. © The Author 2005. Published by Oxford University Press. All rights reserved.
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2.
  • Gårdestig, Magnus, 1973-, et al. (författare)
  • Estimations of effective dose in X-ray examinations derived from information stored in PACS
  • 2005
  • Ingår i: Radiological Protection in Transition. - Stockholm : Statens Strålskyddsinstitut. ; , s. 175-178
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Information about each X-ray examination, in a modern digitized X-ray department is generated and stored in a PACS. Appropriate conversion factors, e.g. E/DAP, can be applied to separate projections and summed to the total effective dose for each examination. The objectives of the work were (i) to investigate the accuracy and precision in the calculated effective dose (ii) to identify data for registration of (1) patient dose, (2) exposure data, and (3) patient information (iii) to make it possible to derive dose statistics on patient level for documentation of diagnostic standard doses, optimizations, constancy checks, and future epidemiological studies. The effective doses were calculated using Monte Carlo based computer programs or by using tabulations. Conversion factors were calculated for different levels of information and the individual effective dose was compared to the most precise estimation. The results suggest that the accuracy in the estimations of effective dose increases by added information about the patient (gender, size) and how the examination was performed.
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