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SUMMARY:ADAPTIVE RADIATION THERAPY METHOD USING CONE BEAM COMPUTED TOMOGRA
 PHY
DTSTART;VALUE=DATE-TIME:20220712T141000Z
DTEND;VALUE=DATE-TIME:20220712T143000Z
DTSTAMP;VALUE=DATE-TIME:20260813T210248Z
UID:indico-contribution-340@events.sinp.msu.ru
DESCRIPTION:Speakers: A. Lisovskaya ()\nThere are situations at prolonged 
 treatment when patient loses weight\, tumor changes its size or new lesion
 s appear. In this case adaptive radiation therapy (ART) is necessary. This
  concept takes into account the changes of patients’ parameters and invo
 lves the recalculation of the treatment plans using new set of images. In 
 this phantom study the ART method with using cone-beam computed tomography
  (CBCT) was developed.\nCBCT doses for head and neck\, chest and pelvis si
 tes were calculated for small and big size of the heterogenic phantoms [1]
 . Deviation between the calculated CBCT doses and the reference doses was 
 determined. The long-term stability of the ratio between Hounsfield Units 
 and Relative Electron Density (HU-RED) for CBCT was investigated [2].\nThe
  deviation of the average dose in the target\, for the plans on the CBCT w
 ith HU-RED for corresponding size and protocol\, from the reference dose w
 as less than 0.5 % and 1.5 % for pelvis and head and neck\, respectively. 
 For lung the deviation of the average dose in the target is 2 % from the r
 eference dose only using the methods of the HU-RED correction.\nHU-RED cur
 ves for XVI Elekta Synergy have good long-term stability.\nThe ART method 
 using the CBCT was developed using X-Ray Volume Imaging (XVI) Elekta Syner
 gy. This method allows to estimate consequences of pediatric patients’ a
 natomy changes and to recalculate new radiotherapy plans without additiona
 l scanning on the computed tomography (CT).\n\n1. Dunlop A.\, McQuaid D.\,
  Nill S. et al. Comparison of CT number calibration techniques for CBCT-ba
 sed dose calculation. // Strahlentherapie und Onkologie. 2015. V. 191. P. 
 970-978.\n2. Rong Y.\, Smilowitz J.\, Tewatia D. et al. Dose calculation o
 n kv cone beam CT images: An investigation of the HU-Density conversion st
 ability and dose accuracy using the site-specific calibration. // Medical 
 Dosimetry. 2010. V. 35. I. 3. P. 195-207.\n\nhttps://events.sinp.msu.ru/ev
 ent/8/contributions/340/
LOCATION: НИИЯФ\, 19к\, ауд. 2-15
URL:https://events.sinp.msu.ru/event/8/contributions/340/
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