import matplotlib.pyplot as plt
from regions.core import PixCoord
from regions.shapes.circle import CirclePixelRegion

center = PixCoord(26.6, 27.2)
reg = CirclePixelRegion(center, 5.2)

mask = reg.to_mask(mode='exact')
shape = (50, 50)
fig, ax = plt.subplots(figsize=(4, 4))
ax.imshow(mask.to_image(shape), origin='lower')