A gastroenterology suite is performing a lengthy therapeutic fluoroscopy case on an adult with prior high skin dose, and the radiologist asks the technologist to set dose-saving defaults while keeping anatomy visible. Table-to-source distance is fixed and magnification was requested only if needed. Which fluoroscopic technique combination best minimizes patient skin dose during the prolonged procedure?

Pulsed fluoroscopy limits effective beam-on time, and last-image hold lets you review anatomy without additional exposure. Limiting beam-on time and magnification also avoids the higher dose rate needed to maintain image quality in zoom modes. With table-to-source distance fixed, keeping the patient close to the receptor preserves source-to-skin distance and avoids the automatic exposure increase associated with a larger patient-to-receptor air gap. Using magnification throughout, even with pulsed mode, hold, and close geometry, fails because electronic magnification narrows the effective field and requires higher entrance exposure; magnification should be used only if needed. Lowering the receptor away from the patient, despite pulsed mode, hold, and restrained magnification, increases the air gap and shortens source-to-skin distance, prompting higher tube output. Continuous low-dose fluoroscopy with hold, limited time and magnification, and close geometry still irradiates throughout activation; pulsed operation reduces exposure when continuous imaging is unnecessary. Exam caveat: collimation can improve contrast and reduce scatter, but it does not correct errors in pulse rate, magnification, or geometry when minimizing skin dose. Practical check: preset a low pulse rate, verify the hold display, position the receptor near the patient, confirm magnification is off unless needed, and announce beam-on time and cumulative air kerma at intervals.