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- 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.
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
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 419c421 < --- > print(filt) 428,429c430,432 < for i in range (proj_fft.shape ): < proj_fft [:, i] *= filt --- > if (f_type.lower () != "none"): > for i in range (proj_fft.shape ): > proj_fft [:, i] *= filt 435,436c438,442 < filtered_proj.resize ((proj.shape , filtered_proj.shape )) < --- > print(proj.shape , filtered_proj.shape ) > #filtered_proj.resize ((proj.shape , filtered_proj.shape )) > arr=filtered_proj[:proj.shape ][:proj.shape ] > print(arr.shape, arr.shape) > filtered_proj=arr