ELogs/JeremyOcampo

Electronic Log for Jeremy Ocampo.

To do

• New water tank setup
  • Scintillator sheet sandwiched between two water tanks replacing plastic blocks.
  • Optical grease in-between for smoothness (will scintillator be contaminated by the grease?)
  • Polish outer surfaces and lens

• Figure out physics of green dis-coloration in high dose areas of plastic

• Fill out wiki page for radiotherapy experimental runs

• Get ML models to work on real images

• Ask Stan for phd viva forms

Completed

2nd year

• 1st term
  • G4 Separate Scintillation and Cerenkov photons in scintillator sheet simulation
    • Whole beam produces Cerenkov photons in the plastic slabs+scintillator sheet while Scintillation is only produced in the scintillator sheet.
    • A "scintillation only" image produces PDD, profile and Output factor within 2% of actual dose.
  • Birmingham Meeting 9th Dec With Adam, Simon, Geoff, Hamid, Spyros
    • Presented simulation results
    • Methods to separate Cerenkov and scintillation, concluded with:
      image plastic block (cerenkov) and then image scintillator sheet sandwiched by plastic slabs (scintillation + cerenkov) and then subtract
    • Plans for experiment in January with scintillator sheet sandwiched between plastic
    • Talked about using the system for treatment plan verification by comparing a video to simulation.
  • PhD transfer Report
  • PhD transfer Viva - passed yay
  • CDT presentation of 1st year work

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 would be internally reflected by all sides of block at there 1st step => 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.