Conveners
Session 10b - Small field dosimetry
- Karen Christaki (IAEA)
- Jan Seuntjens (McGill University)
Description
Learning objectives:
1.Review the ICRU small field dosimetry activities
2. Implementation of small field dosimetry in the clinic
Prof.
M. Saiful Huq
(UPMC CancerCenter)
6/21/17, 9:00โฏAM
Invited Presentation
Wolfgang Lechner
(Department of Radiation Oncology, Division Medical Physics, Medical University Vienna, 1090 Vienna, Austria)
6/21/17, 9:30โฏAM
Dosimetry
Oral Presentation
**Purpose:**
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The International Atomic Energy Agency (IAEA) has established a coordinated research project focusing on clinical testing of the procedures described in the upcoming IAEA/AAPM code of practice on small field dosimetry. The initial task was the determination of beam quality based on square fields with different sizes using a standard MLC shaped 6 MV photon beams....
Jose Manuel LARRAGA-GUTIERREZ
(Instituto Nacional de Neurologia y Neurocirugia)
6/21/17, 9:40โฏAM
Dosimetry
Oral Presentation
Purpose
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To compare and analyze the corrected out factors resulting from three different radiation detectors for small fields of a TrueBeam STxยฎ linac.
Materials and Methods
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Detector signal ratios ($M_{Qclin}^{fclin}/ M_{Qmsr}^{fmsr}$) were measured for a 6 MV WFF (with flatting filter) photon beam of a TrueBeam STx linac. The following nominal square field sizes were used:...
Maria Pimpinella
(ENEA - National Institute of Ionizing Radiation Metrology, I-00123 Rome, Italy)
6/21/17, 9:50โฏAM
Dosimetry
Oral Presentation
**Introduction -** Volume averaging and detector mass-density effects are crucial for dosimetry in radiotherapy photon beams with small field size. Although for solid state detectors as silicon diodes and diamond detectors the two effects tend to balance each other, correction factors are in general required for field output factor measurements of small beams. Recently several studies have...
Lalageh Mirzakhanian
(McGill University, Medical Physics Unit, Montreal, QC H4A 3J1, Canada)
6/21/17, 10:00โฏAM
Dosimetry
Oral Presentation
**Introduction:** The Leksell Gamma Knife (LGK) Perfexion unit is a radiosurgical device delivering a single high dose of radiation and small radiation fields. The dosimetry of LGK should be based on the formalism for the reference dosimetry of small and nonstandard fields since the reference conditions of TG-51 or TRS-398 cannot be established on this unit. There are few published studies on...
Olivia Amanda GARCIA-GARDUรO
(Instituto Nacional de Neurologia y Neurocirugia)
6/21/17, 10:10โฏAM
Dosimetry
Oral Presentation
Introduction
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The problems related to the dosimetry of small photon radiotherapy beams are highlighted in the literature (Das 2008). To perform the dosimetry of such beams, the detectors employed with more frequency are silicon diodes. Nerveless, these detectors over-respond in non-equilibrium conditions. For that reason, it is necessary to apply correction factors according...
Wojciech Bulski
(The Maria Skลodowska Curie Memorial Cancer Centre and Institute of Oncology)
6/21/17, 10:20โฏAM
QA/QC
Oral Presentation
Introduction
Modern radiotherapy is mostly based on the modulation of the beam intensity and on the sterotactic dose delivery. These techniques require very accurate imaging of the patient and very accurate tumour delineation. They also require very accurate dose distribution calculation by the treatment planning systems (TPS). The calculation algorithms use the basic data such as multileaf...
