Radiotherapy/Experimental Runs/2022-07-26

Second experimental measurements with Cyberknife at Birmingham. Green scintillator thin sheet measurements only.

Schematic

Data Taking

All images taken with Nikon D7000, 20mm lens, f/2.8, 400ISO

First run

With scintillator sheet
Collimator Size (mm)	Exposure (s)	Image	Comments
5	30
7.5	20
10	15
12.5	10
15	8
20	8
25	6
30	6
35	5
40	4
50	3
60	3

No scintillator sheet
Collimator Size (mm)	Exposure (s)	Image	Comments
60	3		Can see green discolouration caused by previous irradiations. Blocks must have been rotated by 90 when re-assembling

Second run
Replaced plastic blocks from first run with new un-irradiated plastic blocks, but using same green scintillator sheet.

With scintillator sheet
Collimator Size (mm)	Exposure (s)	Image	Comments
5	30
7.5	20
10	15
12.5	10
15	8
20	8
25	6
30	6
35	5
40	4
50	3
60	3		Green discolouration probably from scintillator sheet. Rotated by 90 when re-assembling blocks and sheet

No scintillator sheet
Collimator Size (mm)	Exposure (s)	Image	Comments
5	30
7.5	20
10	15
12.5	10
15	8
20	8
25	6
30	6
35	5
40	4
50	3
60	3