Penile injection test

I don’t know whether somebody else asked this question but did somebody made an penile injection test ?
if so it would be very nice to tell what was diagnosed or whether his erection was as full as in pre-finasteride days. I mean to exclude things like arterial blockage. I know it’s probably rather a neurological problem but I guess nevertheless worth to ask

My penis fills up the same as pre fin with pde5i.

For a very long time my penis wasn’t filling out properly - the vein on the underside wasn’t filling and hardening. This seems to have improved recently.