Protect, Enhance, and Save Lives - 1 -
III ARDENT Annual Workshop
29/09-02/10/2014IBA Dosimetry
Francesca BiselloESR 10
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OutlineResearch Activities
ConferencesTraining and Secondments
I. Research Activities
II. Conferences
III. Trainings and Secondments
Outline
Protect, Enhance, and Save Lives - 3 -
Research Activities
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Dosepix Characterization
General overview
OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix detector as Quality Assurance tool in diagnostics
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Energy(keV)
Counts
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix Characterization
kVp-meter in mammography
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OutlineResearch Activities
ConferencesTraining and Secondments
October 2013 – October 2014:
Dosepix as kVp-meter in mammographyRadiation Tolerance studiesTemperature characterization
Dosepix Characterization
Sum up of activities
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix CharacterizationkVp-meter in mammography
o Image quality and dose depend on the xRay tube voltage
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Tube setting: 30 kV, 20 mAs
Mo-Mo
Big Pixels
Tube setting: 30 kV, 20 mAs
Mo-Mo
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix CharacterizationkVp-meter in mammography
o kVp: fitting the end point of the spectrum
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f(x) = 0.905925196214262 x + 3.35983643787807R² = 0.993008054945356
kVp MagicMax (kV)
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kVp (MagicMAx) (KV)D
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Additional filtration: 0.3mm CuCounts/big pixel/s: 1.5 · 104 Hz [ count rate without filtration : 5· 104 Hz ]
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix Characterization
RadiationTolerance studies
10-28/02/2014Secondment at CERNRadiation Tolerance Studies
Measurement Session:Accumulated dose for the test: 5 kGy in step of 200 Gy Tube settings: 40 kV, 2 mA dose rate 4.83 Gy/min
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix CharacterizationRadiation Tolerance studies
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix CharacterizationRadiation Tolerance studies
Poster Presention IEEE 2014, 8-15 November 2014 “Investigation on the radiation tolerance of Dosepix detector” F. Bisello, W.S. Wong , E.Frojdh , J.Alozy I. Ritter, A.Zang, M. Campbell, J.C.Celi, G.Anton and T.Michel
o Deeper analysis of effect around mammographic energieso Investigations in damages in the sensor or in the chip
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix Characterization
Temperature Characterization
First Measurement Session: CERN (secondment)Addidtiona Investigations: IBA Dosimetry
Measurement Session:Range required by the regulation: 15°- 35 °CInstability < 1%
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix CharacterizationTemperature Characterization
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix CharacterizationTemperature Characterization
Source of instability (I):PLL circuit
Source of instability (II):Bias current of initial gain stage of
the discriminator
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OutlineResearch Activities
ConferencesTraining and Secondments
Dosepix CharacterizationTemperature Characterization
Next steps:
o Evaluate the possibility to bypass the PLL circuit
o Find other more stable configurations for the analog front end
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OutlineResearch Activities
ConferencesTraining and Secondments
Other Activities
SFD diodes
Machine and Plan QASmall Field external Radiotherapy
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OutlineResearch Activities
ConferencesTraining and Secondments
Other ActivitiesSFD diodes
Studies on sensitivity dependence from:
• Dose• Dose per pulse• Dose rate
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OutlineResearch Activities
ConferencesTraining and Secondments
Other ActivitiesSFD diodes
Oral Presentation, RESMDD14, 8-10 October 2014 “Development of silicon monolithic arrays for dosimetry in external beam radiotherapy”
F. Bisello, M. Bucciolini, M. Bruzzi, D. Menichelli, M. Scaringella, C. Talamonti, M. Zani1,2
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Conference
Trainings
Secondments
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OutlineResearch Activities
ConferencesTraining and Secondments
Conferences 2014
DPG Mainz, 25th March 2014Oral Presentation “Characterization of the Dosepix detector under clinical conditions ”
RESMDD Florence, 8-10 October 2014Oral Presentation “Development of silicon monolithic arrays for dosimetry in external beam radiotherapy”
IEEE 2014 Seattle, 8-15 November 2014Poster Presentation “Investigation on the radiation tolerance of Dosepix detector”
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OutlineResearch Activities
ConferencesTraining and Secondments
Planned Training and Secondments
Business and Administration training, ST Microelectronics
Secondment at the UPENN University Hospital, Phyladelphia (tentative: 16-28 November 2014):
Measurements on plan QA with silicon monolithic array
Trainings on clinical quality assurance routine (to be defined)
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Thank you very much for your attention
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