If cost is your concern, it’s better to use professional facilities occasionally than gamble with odd at-home scans that could cause unnecessary alarm or missed issues.
I’d only consider using one if it was under medical advice, minimally exposed, and I had a clear plan for follow-up, and I’m not alone in thinking that.
Handheld units? They’re cool but risky for casual use. Stick with pros when possible. If you do go DIY, keep exposure short, follow safety indices, and always consult your doctor.