What is located inside an extraoral cassette?

Inside an extraoral cassette, there are intensifying screens. These screens are crucial for the x-ray imaging process as they convert the x-ray energy into visible light, typically blue or green. This visible light then exposes the x-ray film, which is positioned inside the cassette. The use of intensifying screens allows for a reduction in the amount of radiation required to produce a diagnostic image, increasing both patient safety and comfort. Furthermore, the combination of the film and the intensifying screens enhances the quality of the image captured, making them essential components of the radiographic process.

X-ray films are indeed part of the setup but are not located inside the cassette separately; they are placed in conjunction with the intensifying screens. Lead foil is often found behind the film to absorb scattered radiation and reduce fogging, but it is not a primary component found within the extraoral cassette space. Developer solution is part of the processing stage that occurs after the film has been exposed and removed from the cassette, so it is not present inside the cassette during the imaging process.