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Design and evaluation of a patient positioning system for BNCT

Munck af Rosenschöld, Per (1999)
Medical Physics Programme
Abstract (Swedish)
A patient positioning system for Boron Neutron Capture Therapy (BNCT) for treatment of brain tumours was designed, and its accuracy was evaluated. The system will be used at the BNCT facility under construction at Studsvik, Sweden. Recent studies have shown that the accuracy in the patient positioning procedure in BNCT is of more significance than generally perceived in the past. Therefore one objective of this study was to achieve an accuracy equal to, or better than, conventional standards. An aquaplast mask system was chosen for fixation, the mask can be attached to a head support device reminding of a camera head. The head support is in turn mounted onto a motorised couch. A three-dimensional digitiser is used for localisation of the... (More)
A patient positioning system for Boron Neutron Capture Therapy (BNCT) for treatment of brain tumours was designed, and its accuracy was evaluated. The system will be used at the BNCT facility under construction at Studsvik, Sweden. Recent studies have shown that the accuracy in the patient positioning procedure in BNCT is of more significance than generally perceived in the past. Therefore one objective of this study was to achieve an accuracy equal to, or better than, conventional standards. An aquaplast mask system was chosen for fixation, the mask can be attached to a head support device reminding of a camera head. The head support is in turn mounted onto a motorised couch. A three-dimensional digitiser is used for localisation of the patient in the treatment room. The three-dimensional digitiser is an instrument which is able to locate points in space. The accuracy of this was determined to be 1.3 mm (1 SD). A mathematical formalism was developed which calculates the settings of the couch and the head support in the treatment room, enabling reproduction of the dose plan. To evaluate the system’s accuracy a phantom was created and CT-scanned with several markers attached (1.5 mm radius tungsten balls). A dose plan was generated from the CT-scan, and beams were planned so that their entry and exit points each coincide with a marker position. The positioning of 28 beams were simulated based on the dose plan, and a system accuracy of ± 3 mm (1 SD) in each direction was achieved. (Less)
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author
Munck af Rosenschöld, Per
supervisor
organization
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Strålterapi
language
English
id
2156911
date added to LUP
2011-09-13 15:33:47
date last changed
2011-09-13 15:33:47
@misc{2156911,
  abstract     = {A patient positioning system for Boron Neutron Capture Therapy (BNCT) for treatment of brain tumours was designed, and its accuracy was evaluated. The system will be used at the BNCT facility under construction at Studsvik, Sweden. Recent studies have shown that the accuracy in the patient positioning procedure in BNCT is of more significance than generally perceived in the past. Therefore one objective of this study was to achieve an accuracy equal to, or better than, conventional standards. An aquaplast mask system was chosen for fixation, the mask can be attached to a head support device reminding of a camera head. The head support is in turn mounted onto a motorised couch. A three-dimensional digitiser is used for localisation of the patient in the treatment room. The three-dimensional digitiser is an instrument which is able to locate points in space. The accuracy of this was determined to be 1.3 mm (1 SD). A mathematical formalism was developed which calculates the settings of the couch and the head support in the treatment room, enabling reproduction of the dose plan. To evaluate the system’s accuracy a phantom was created and CT-scanned with several markers attached (1.5 mm radius tungsten balls). A dose plan was generated from the CT-scan, and beams were planned so that their entry and exit points each coincide with a marker position. The positioning of 28 beams were simulated based on the dose plan, and a system accuracy of ± 3 mm (1 SD) in each direction was achieved.},
  author       = {Munck af Rosenschöld, Per},
  keyword      = {Strålterapi},
  language     = {eng},
  note         = {Student Paper},
  title        = {Design and evaluation of a patient positioning system for BNCT},
  year         = {1999},
}