ELogs/JeremyOcampo

Electronic Log for Jeremy Ocampo.

To do

• G4 Simulate an image from a 1mm thick scintillator in a non-scintillating plastic slab
  • compare to image from thick scintillator block
  • this is to test the idea that we are seeing errors due to focal depth or light coming from different depths
• G4 Get profiles at different depths and compare to data
• G4 Get output factor curves and compare to data
• G4 Make code neater, add more macros
• Report Finish first draft of start of report.
• Group placement make poster of group placement project
• Camera Familiarize oneself with DSLR camera and software
• Reading

Completed

• Workshop Went to workshop - "Challenges and opportunities within practical small field dosimetry" - 9th may
• G4 Simulate image from a 10cmx10cmx20cm scintillator and compared it's pdd with image from dslr camera.
  • ~100,000 optical photons collected by lens given ~10,000,000 x-ray photons, which took 3 hours.
  • reduced computing time using multithreaded mode, and also using the symmetry of the system by adding more lenses to collect more light
• G4 Import phase space file (cyberknife) beam to use as primary generator.
• Group placement exploring the simulacrum cancer data from PHE - 12th april
  • presentation
  • report
• 2nd term courses Machine learning with Big data, Inverse problems in imaging

1st year

• Summer
  • Summer School STFC Data Intensive, Artificial Intelligence and Machine Learning Summer School 2019
  • G4 Simulate PDD, profile and Output factor from a scintillator sheet sandwiched between 2 platic slabs:
    • PDD agrees within 2% but profile and Output factor(OF) doesn't.
    • Cerenkov coming from plastic slabs distorts OF and profile.
    • This is because as you increase the beam width, the amount of X-ray going into the plastic slab is proportional to (beam width)²
      but the amount of X-rays going into the sheet is proportional to beam width.

• 3rd term
  • Workshop Went to workshop - "Challenges and opportunities within practical small field dosimetry" - 9th may
  • G4 Simulate image of an irradiated scintillator block and compared it's pdd with image from CCD camera.
    • ~100,000 optical photons collected by lens given ~10,000,000 x-ray photons, which took 3 hours.
  • G4 Speed improvements of scintillator block image:
    • can use 4 lens' as there is 2 planes of symmetry => simulation captures 4x as much photons
    • Use HEP batch farm to run jobs on 100 cores
    • kill optical photons which are internally reflected by all sides of block => simulation ~10x faster

• 2nd term
  • Courses: Machine learning with big data, Inverse problems in imaging
  • Group placement project: exploring the simulacrum cancer dataset from PHE (partnered with Valtech)
    • presentation
    • report
  • G4 Import phase space file (cyberknife) beam to use as primary generator.
  • G4 Simulate PDD, profile dose distributions in water and compare with measured.

• 1st term
  • Courses: Standard model 1 & 2, Prob and stats, Research software (python)
  • G4 Learning Geant4 with:
    • ED-Geant4 - Lectures with exercises and solutions from an intro G4 workshop in 2018.
    • Geant4 book - Reference for G4.