医学类-牙科放射线学--口腔數位影像失誤.ppt

Miscellaneous Errors Ref. 4 Normal orientation of cassette within cassette holder Ref. 3 Opposite side of the cassette was wrongly placed facing the X-ray tube Ref. 3 Opposite side of the cassette was wrongly placed facing the X-ray tube Ref. 3 Ref. 3 Normal orientation of cassette within cassette holder The cassette was incorrectly placed upside down within the cassette holder of the X-ray machine The cassette was incorrectly placed upside down within the cassette holder of the X-ray machine Ref. 3 The cassette was incorrectly placed upside down within the cassette holder of the X-ray machine Ref. 3 The cassette was incorrectly placed upside down within the cassette holder of the X-ray machine Ref. 3 The cassette was incorrectly placed upside down within the cassette holder of the X-ray machine Ref. 3 The cassette was incorrectly placed upside down within the cassette holder of the X-ray machine then scanned upside down Ref. 3 The cassette was incorrectly placed upside down within the cassette holder of the X-ray machine then scanned upside down Ref. 3 Digora cassette 放反 Ref. 3 Ref. 3 Ref. 3 Ref. 3 A further example of image obtained was too bright due to delayed sensor plate scanning (N.B. overlap of two sensor plates) Ref. 3 數位底片在洗片前二張重疊1 Ref. 3 數位底片在洗片前三張重疊的最底下一張 Ref. 3 Ref. 3 Further example of defective image Ref. 3 Further example of defective image Ref. 3 Further example of defective image Ref. 3 Further example of defective image Ref. 3 Further example of defective image Ref. 3 Further example of defective image Ref. 3 Further example of defective image Ref. 3 Further example of defective image Ref. 3 Further example of defective image Ref. 3 Further example of defective image 1. Important ways of decreasing the radiation dose are to determine whether there is an explicit clinical indication for each exposure and to make sure that each exposure is taken under adequate conditions, thereby avoiding the formation of image artifacts minimizing the ne