Radiotherapy/Experimental Runs/2022-09-07

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Third experimental measurements with Cyberknife at Birmingham. Green and blue scintillator thin sheet measurements with measurements of green radiation damage.

Setup

Schematic

setup_1.png

Photos of setup

_DSC4715.JPG setup_photo.jpg setup_photo3.jpg crosshair.jpg laser.jpg green_disco.jpg

Pre-data Taking Information and Notes

  • Used 200mmx200mmx2mm green or blue scintillator sheet polystyrene base sandwiched by two 200mmx200mmx50mm polystyrene clear plastic blocks
  • 53cm from "phi" symbol on camera to sheet
  • Checked camera in focus with ruler in front/back and middle of two blocks.
  • Pelicase on couch
  • Scintillator blocks aligned to laser cross hairs
  • 785 mm source to surface distance suitable for output factor/PDD/profile measurements.
  • Room lights out and pelicase window closed by 1mm pelicase material.
  • Check optical axis aligned with top surface using crosshair in the image analysis.

Camera settings

  • Focal length 20mm
  • lens focus distance – 0.5 (500mm)
  • 53cm focal plane (phi on camera ) to sheet
  • f-number 5.6

Data taking

Plan

  • Take photos of blue sheet with blocks starting from 60mm collimator size to 5mm.
  • Remove blue sheet – repeat measurements
  • Use new set of blocks and blue sheet - repeat measurements
Blue scintillator sheet
Collimator Size (mm) Exposure (s) ISO f-number File no. Comments Image
60 10 400 5.6 69-73
coll_size_60mm_0.JPG
50 10 400 5.6 74-78
coll_size_50mm_0.JPG
40 13 400 5.6 79-83
coll_size_40mm_0.JPG
35 15 400 5.6 84-88
coll_size_35mm_0.JPG
30 15 400 5.6 89-93
coll_size_30mm_0.JPG
25 20 400 5.6 94-98
coll_size_25mm_0.JPG
20 25 400 5.6 99,101-104
coll_size_20mm_0.JPG
15 30 400 5.6 106-110
coll_size_15mm_0.JPG
12.5 30 400 5.6 111-115
coll_size_12-5mm_0.JPG
10 30 400 5.6 116-120
coll_size_10mm_0.JPG
7.5 30 400 5.6 121-130
coll_size_7-5mm_0.JPG
5 30 400 5.6 131-140
coll_size_5mm_0.JPG
60 4 400 5.6 161-165
coll_size_60mm_4s.JPG
60 5 400 5.6 166-170
coll_size_60mm_5s.JPG
60 6 400 5.6 171-175
coll_size_60mm_6s.JPG
5 30 800 5.6 141-145
coll_size_5mm_30s_iso800_f5-6.JPG
5 30 1600 5.6 146-150
coll_size_5mm_30s_iso1600_f5-6.JPG
5 30 400 2.8 151-155
coll_size_5mm_30s_iso400_f2-8.JPG
5 15 1600 5.6 156-160
coll_size_5mm_15s_iso1600_f5-6.JPG
No scintillator sheet
Collimator Size (mm) Exposure (s) ISO f-number File no. Comments Image
60 10 400 5.6 69-73
coll_size_60mm_0.JPG
50 10 400 5.6 74-78
coll_size_50mm_0.JPG
40 13 400 5.6 79-83
coll_size_40mm_0.JPG
35 15 400 5.6 84-88
coll_size_35mm_0.JPG
30 15 400 5.6 89-93
coll_size_30mm_0.JPG
25 20 400 5.6 94-98
coll_size_25mm_0.JPG
20 25 400 5.6 99,101-104
coll_size_20mm_0.JPG
15 30 400 5.6 106-110
coll_size_15mm_0.JPG
12.5 30 400 5.6 111-115
coll_size_12-5mm_0.JPG
10 30 400 5.6 116-120
coll_size_10mm_0.JPG
7.5 30 400 5.6 121-130
coll_size_7-5mm_0.JPG
5 30 400 5.6 131-140
coll_size_5mm_0.JPG
60 4 400 5.6 195-199
coll_size_60mm_4s.JPG
60 6 400 5.6 200-204
coll_size_60mm_6s.JPG
Green scintillator sheet
Collimator Size (mm) Exposure (s) ISO f-number File no. Comments Image
60 2 400 5.6 281-285
coll_size_60mm_2s_0.JPG
60 3 400 5.6 286-290
coll_size_60mm_3s_0.JPG
60 4 400 5.6 291-295
coll_size_60mm_4s_0.JPG
60 6 400 5.6 296-300
coll_size_60mm_6s_0.JPG
60 10 400 5.6 301-305
coll_size_60mm_10s_0.JPG
50 10 400 5.6 306-310
coll_size_50mm_10s_0.JPG
50 2 400 5.6 311-315
coll_size_50mm_2s_0.JPG
40 13 400 5.6 316-320
coll_size_40mm_13s_0.JPG
40 2 400 5.6 321-325
coll_size_40mm_3s_0.JPG
35 4 400 5.6 326-330
coll_size_35mm_4s_0.JPG
35 15 400 5.6 331-335
coll_size_35mm_15s_0.JPG
30 15 400 5.6 336-340
coll_size_30mm_15s_0.JPG
30 4 400 5.6 341-345
coll_size_30mm_4s_0.JPG
25 20 400 5.6 346-350
coll_size_25mm_20s_0.JPG
25 5 400 5.6 351-355
coll_size_25mm_5s_0.JPG
20 25 400 5.6 356-360
coll_size_20mm_25s_0.JPG
20 6 400 5.6 361-365
coll_size_20mm_6s_0.JPG
15 30 400 5.6 366-370
coll_size_15mm_30s_0.JPG
12.5 30 400 5.6 377-381
coll_size_12-5mm_30s_0.JPG
10 30 400 5.6 382-386
coll_size_10mm_30s_0.JPG
7.5 30 400 5.6 387-391
coll_size_7-5mm_30s_0.JPG
5 30 400 5.6 392-396
coll_size_5mm_30s_0.JPG
Background
Collimator Size (mm) Exposure (s) ISO f-number File no. Comments Image
None 4 400 5.6 176
exposure_4s.JPG
None 5 400 5.6 177
exposure_5s.JPG
None 6 400 5.6 178
exposure_6s.JPG
None 8 400 5.6 179
exposure_8s.JPG
None 10 400 5.6 180
exposure_10s.JPG
None 13 400 5.6 181
exposure_13s.JPG
None 15 400 5.6 182
exposure_15s.JPG
None 20 400 5.6 183
exposure_20s.JPG
None 25 400 5.6 184
exposure_25s.JPG
None 30 400 5.6 185
exposure_30s.JPG