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Zapytanie: SKRZYŃSKI
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Tytuł oryginału: Evaluation of physical parameters of a CT unit in radiotherapy treatment planning.
Autorzy: Skrzyński Witold, Tołwiński Jerzy, Bulski Wojciech
Źródło: Pol. J. Med. Phys. Engin. 2002: 8 (4) s.231-238, il., tab., bibliogr. 6 poz.
Sygnatura GBL: 306,499

Hasła klasyfikacyjne GBL:
  • radiologia

    Typ dokumentu:
  • praca doświadczalna
  • tytuł obcojęzyczny

    Streszczenie angielskie: The aim of this study was to evaluate physical parametes of a Siemens Somaton DRH computed tomography unit used for radiotherapy treatment planing. Three groups of measurements were performed: control of the image geometry, dose absorbed by the patients, and estimation of the function relating CT numbers to tissue electron density. It was found that for properly performed examination, doses absorbed by patients do not exceed reference dose values published in the European Commision guideliness. Additional reference levels could be established for non-diagnostic examinations performed only before radiotherapy treatment planing (breast tomography). Function relating CT numbers to issue electron density determined for the Siemens Somatom DRH does not differ significantly from that used in the Cadplan treatment planing system in the soft tissue range. Beam hardening artefacts and changes in image slice width are the main causes of variations in CT numbers. Inaccuracies of dose distribution calculations due to the observed inaccuuracies were also estimated.

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