Table 2.

Primary outcomes

Factors	Variables
Patients*	Procedure type Age Sex
Fluoroscopic system	Fluoroscopic device (company, device model and manufacturing year) Basic use setting: frame per second and radiation field (cm2) †
Radiation exposure	Total fluoroscopy time (min) Air-Kerma (mGy) Dose–area product (Gycm2) Total number of roentgenography procedures Radiation dose rate (mGy/min)

*We will not collect patient weight or height because we have selected patients of standard size for the Japanese population, whose weight will range from 50 to 70 kg.

†When the setting changes during the procedure, we will record the basic setting.