Spot film, photospot and cine recording
A comparison table of four fluoroscopic image-recording methods. Two record still images: spot film (film-screen), a dedicated cassette in the beam giving the highest still resolution (about 5 to 10 line pairs per mm) at high dose per image and allowing multiple exposures per film; and the photospot camera, which records the image-intensifier output through a beam-splitter mirror onto small-format film (about 70 to 100 mm, roughly 30 percent of a spot film) at lower mAs per frame, giving lower dose, rapid sequences and less noisy images but intensifier/TV-limited resolution. Two record motion: cine fluorography, full-frame at 25 to 30 frames per second, giving the highest resolution for motion but the highest dose rate; and pulsed fluoroscopy with last-image-hold, the lowest-dose option where holding the last frame adds no extra dose. General rule: better spatial resolution costs more dose. Cine also needs the x-ray pulse rate locked to the frame rate.
Practice the Physics paper
FRCRX is a Part 1 Physics question bank: true/false items with explanations, timed mocks and topic analytics.