Table of Contents
BrmRTG
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Update 2022
- We have seen old Gendex dental X-ray machine.
- Gendex 765dc built in 2001.
- Condition: Minor oil leak (investigate/refull, high voltage can be dangerous without oil). Should be working otherwise.
- + CAWO scintilator cassette 35×43, blue/black, inside is PRIMAX G-400, 2x.
Overview
An X-ray machine has been built from a vacuum diode and then from real 1970s X-ray tube, overclocked TV transformer and a hospital X-ray screen. Some X-ray photos have been taken. As of 12/2014, the high voltage supply is broken and efforts are on building a better one.
Update: Since 12/2015 we got as gift old X-ray transformer but we must dry transformer first before filling by oil. Without insulating oil transformer burns up quickly. As insulating oil we bought 5l of special transformer oil Paramo MOGUL TRAFO CZ-A (thanks all for donations :)) https://eshop.paramo.cz/data/VyrobkovaDokumentace/ti_trafo_cza_z5.pdf
Jenda wrote a final exam work at the high school about it: http://jenda.hrach.eu/brm/ct.pdf
photos:
parallel_beam.py, mirror, patch:
30a31
> import matplotlib.pyplot as pl
383c384
< if (f_type.lower () == "none"):
---
> """if (f_type.lower () == "none"):
387c388
< return filtered_proj
---
> return filtered_proj"""
415c416,417
< raise ValueError ("rho_filter: Unknown window type: %s" % f_type)
---
> #raise ValueError ("rho_filter: Unknown window type: %s" % f_type)
> window = 1
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<
---
> print(filt)
428,429c430,432
< for i in range (proj_fft.shape [1]):
< proj_fft [:, i] *= filt
---
> if (f_type.lower () != "none"):
> for i in range (proj_fft.shape [1]):
> proj_fft [:, i] *= filt
435,436c438,442
< filtered_proj.resize ((proj.shape [0], filtered_proj.shape [1]))
<
---
> print(proj.shape [0], filtered_proj.shape [1])
> #filtered_proj.resize ((proj.shape [0], filtered_proj.shape [1]))
> arr=filtered_proj[:proj.shape [0]][:proj.shape [0]]
> print(arr.shape[0], arr.shape[1])
> filtered_proj=arr
Now we have:
1. X-ray tubes
We have two old X-ray tubes manufactured by Chirana in 1970 but the smaller one is broken (R.I.P). Actually we use the larger one DOK-70kVv
2. X-ray transformer
This is old HV X-ray transformer 230V/80kV :) it is constructed for operation under oil fill.
3. X-ray screen
We use as screen original X-ray screen Agfa Ortho Regular 24×30 mounted in ClubMate box with mirror to prevent damage camera by heavy x-ray beam.
4. 3D printed X-ray tube holder
Ray designed in CAD holder for flexible manipulation with X-ray tube and printed it by 3D printer
~~CL~~
