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Sökning: L773:0250 7005 OR L773:1791 7530 > (2015-2019) > Isacsson Ulf

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1.
  • Johansson, Andreas K., et al. (författare)
  • Neurovascular Bundle Infiltration Can Explain Local Relapses Using Conformal Radiotherapy of Prostate Cancer.
  • 2017
  • Ingår i: Anticancer Research. - : Anticancer Research USA Inc.. - 0250-7005 .- 1791-7530. ; 37:4, s. 1825-1830
  • Tidskriftsartikel (refereegranskat)abstract
    • AIM: To quantify the impact of decreased margins for two treatment techniques, three-dimensional conformal radiotherapy (3D-CRT) and volumetric-modulated arc therapy (VMAT), on local control in curative treatment of prostate cancer.MATERIALS AND METHODS: The planning target volume (PTV) margins were decreased in steps of 1 mm from 10 to 1 mm. Treatment plans using 3D-CRT and VMAT technique were produced for all margin sizes and the dose to the neuro vascular bundles (NVB), that was not included in the PTV, was investigated.RESULTS: Due to the more conformal dose delivery using VMAT, the dose to the NVB decreased more rapidly by VMAT compared to the 3D-CRT plans. The dose difference was significant for margins from 1-7 mm.CONCLUSION: One should be very cautious before clinical routines are changed, bearing in mind whether the change means more conformal treatment technique, smaller margins or target segmentation in different imaging modalities.
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2.
  • Wikström, Johan, 1964-, et al. (författare)
  • Magnetic Resonance Compatibility of a Transponder Aimed for Radiotherapy Positioning – A Phantom Study
  • 2017
  • Ingår i: Anticancer Research. - : Anticancer Research USA Inc.. - 0250-7005 .- 1791-7530. ; 37:9, s. 4993-4996
  • Tidskriftsartikel (refereegranskat)abstract
    • Background/Aim: Electromagnetic Positioning Systems (EMP) is a new position-ing technique in four-dimensional radiotherapy. Patients with implanted transponders may be referred for magnetic resonance imaging (MRI) making it important to establish the MR safety.Materials and Methods: Oranges were prepared with transponders and imaged on a 3T MR scanner with different sequences. Computed tomography (CT) was performed as comparison. MR artifacts were assessed. An estimation of the maximum transponder de-flection force and heating was made.Results: The mean measured displacement of transponders was 0.1 mm (range=0.03-0.3 mm). Artifacts were observed adjacent to transponders using all sequences. The deflection force on the transponder in the gantry was less than 38 mN. No heating was observed.Conclusion: The absence of any substantial movement, the weak measured deflection force and absence of observed heating speaks for the safe use of MR imaging with transponder 3T. Local artefacts makes evaluation impossible adjacent to transponders.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Isacsson, Ulf (2)Ta bort avgränsningen
Lennernäs, Bo, 1963 (2)
Wikström, Johan, 196 ... (1)
Johansson, Bengt, 19 ... (1)
Johansson, Andreas K ... (1)
Lärosäte
Uppsala universitet (2)
Örebro universitet (2)
Språk
Engelska (2)
Forskningsämne (UKÄ/SCB)
Medicin och hälsovetenskap (2)
År
2017 (2)

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