[[BrmRTG]]
 

BrmRTG

brmrtg
sdc10743.jpg
founder: Jenda
ray
depends on:
interested: EDITME
EDITME
software license: -
hardware license: -
status: active

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

 foto1 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

 foto2 This is old HV X-ray transformer 230V/80kV :) it is constructed for operation under oil fill.

3. X-ray screen

 foto3 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

 
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