You are talking “apples and oranges”.
The calcium that shows up on a CAC can’t be seen with a normal plain-vanilla X-ray.
CAC uses an ultra-fast CT.
Like I said, apples and oranges
Hope this helps…
“When dense and heavy, calcifications can be detected by chest x-rays.”
https://www.ncbi.nlm.nih.gov/books/NBK557689/
Even dentists are doing it:
“Carotid calcium identified in panoramic radiographs was associated with high coronary artery calcium. Awareness of carotid calcium recognized by dental practitioners in low-cost, low radiation and commonly done panoramic radiographs may be useful to identify patients at risk of coronary disease with potential future cardiovascular events.”
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7860958/
I have no coronary calcium in my dental 360 or my chest X-ray, since having my CT scan. Chest X-rays and dental 360 images can’t compute CAC scores, but they, most definitely, can show calcium sitting where it shouldn’t be.