TRA versus TFA in 6-vessel DCA (radiation exposure and age comparison)
| TRA | TFA | P value | |
| FT | 19.1 (15.28–23.2) | 11 (9.3–14.4) | <0.001 |
| DAP | 3978.5 (3123.03–4713.75) | 2604 (1938.5–3603.8) | 0.001 |
| TD | 317.65 (251.5–455.6) | 224.5 (168.5–302) | 0.001 |
| Age | 47 (38.8–59.5) | 53 (46–64) | 0.056 |
DAP, dose area product; DCA, diagnostic cerebral angiogram; FT, Fluoroscopy time; TD, total dose; TFA, transfemoral access; TRA, transradial access.