Hi all,
I am trying to analyze images acquired with SFOV and LFOV CBCT for two Catphan phantoms (504 and 600). Unfortunately the script gives errors in both cases.
My script is pretty simple:
from pylinac import CatPhan600
import tkinter as tk
from tkinter import filedialog
root = tk.Tk()
root.lift()
root.focus_force()
root.wm_attributes(‘-topmost’,True)
root.after_idle(root.attributes,‘-topmost’,False)
root.withdraw()
# image selection
cbct_folder = filedialog.askdirectory()
mycbct = CatPhan600(cbct_folder)
mycbct.analyze()
# print results to the console
print(mycbct.results())
# view analyzed images
mycbct.plot_analyzed_image()
# save the image
mycbct.save_analyzed_image(‘mycatphan.png’)
# generate PDF
mycbct.publish_pdf(‘mycatphan.pdf’, open_file=True) # open the PDF after saving as well.
Below the errors, that are different in the case of the 504 and 600.
Catphan 504:
add = (f’MTF 50% (lp/mm): {self.ctp528.mtf.relative_resolution_at(50):2.2f}\n’)
AttributeError: ‘MTF’ object has no attribute ‘relative_resolution_at’
Catphan 600:
File “C:\ProgramData\Anaconda3\lib\site-packages\pylinac\ct.py”, line 1294, in results
add = (f’MTF 50% (lp/mm): {self.ctp528.mtf.relative_resolution_at(50):2.2f}\n’)
File “C:\ProgramData\Anaconda3\lib\site-packages\pylinac\ct.py”, line 637, in mtf
mtf = MTF(lp_spacings=spacings, lp_maximums=maxs, lp_minimums=mins)
File “C:\ProgramData\Anaconda3\lib\site-packages\pylinac\core\mtf.py”, line 38, in init
max_delta = np.max(np.diff(list(self.norm_mtfs.values())))
File “<array_function internals>”, line 6, in amax
File “C:\ProgramData\Anaconda3\lib\site-packages\numpy\core\fromnumeric.py”, line 2734, in amax
keepdims=keepdims, initial=initial, where=where)
File “C:\ProgramData\Anaconda3\lib\site-packages\numpy\core\fromnumeric.py”, line 87, in _wrapreduction
return ufunc.reduce(obj, axis, dtype, out, **passkwargs)
ValueError: zero-size array to reduction operation maximum which has no identity
If anyone wants to help me, I would be grateful 
Thanks in advance!
Andrea