Hi there ~
What has happened has happened. I regret and am sorry about your father's loss. I think it is a time to grieve rather than think about what could have been done differently. There are varied opinions on how an agitated patient should be treated to get a proper CT scan
done. However, I hope that your father's death was a peaceful one.
I hope you are at peace and please try not to dwell over the situation.
Take care and have a lovely day !