Radiography Part 6 - Common Film Faults First name:   Last name:   Email Address     1 This is an intraoral DV view of the nasal chambers of a dog. There is a film artifact which has been circled. What is the likely cause of this? Over exposure Pressure mark from a tooth Dirt on the intensifying screen Developer solution too hot Fingerprint from careless handling of the film 2 This X ray was produced as one of a series of X rays of a lame dog. What is the cause of this appearance? Movement blur, due to movement of the patient during exposure Over exposure Double exposure, due to using the same cassette twice Faulty exposure button Use of Right and Left labels for the same X ray exposure 3 This is VD view of a dog’s hips and stifles. There are a number of faults with this X ray, but which is the most important fault? The film is over exposed The patient is poorly positioned The X ray beam is poorly centred There are unprotected hands in the primary X ray beam Collimation of the X ray beam is inadequate 4 This is a lateral projection of the abdomen of a dog. There is a film artifact (arrowed). What steps would you take to prevent this artifact being repeated? Open the X ray cassette and clean the intensifying screens Alter the exposure factors Clean the rollers of the automatic processor Check the dark room for light leakage Replenish the fixer solution 5 What is the most likely explanation for the blackening in the top right hand corner of this image (starred)? Light leakage into the cassette or film box Over exposure A faulty darkroom safe light Inaccurate collimation Film too long in the developer solution 6 What is the most important fault on this X ray of a dog’s pelvis? Under exposure Over exposure Inadequate washing of the film Faulty use of a grid Movement blur due to movement of the patient during exposure 7 How would you improve the quality of this X ray? Check the temperature of the developer, and replenish if necessary       Check the fixer, and replenish if necessary Increase the exposure factors Use a grid Clean the rollers of the automatic processor 8 This image was produced by turning off all lights in the darkroom except for the safelight, holding a piece of unexposed piece of film on the work bench for 2 minutes, then processing the film. How could you explain the result? This is a normal finding – all is well in the dark room The outline of the hand can be seen due to sweat / grease on the palm The outline of the hand can be seen due to fogging of the surrounding film by a faulty safelight or light leakage into the darkroom The outline of the hand can be seen due to a pressure effect on the film The outline of the hand can be seen but this is quite normal if you take too long in the darkroom