Title :
Real-time X-ray fan-beam z-axis position measurement
Author :
Gard, Michael F.
Author_Institution :
Gen. Electr. Med. Syst., Milwaukee, WI, USA
fDate :
4/1/1994 12:00:00 AM
Abstract :
Precise control of fan-beam position is important to the production of highest quality CT images; failure to maintain fan-beam orientation can produce image artifacts. This paper describes a special technique which provides accurate real-time measurement of fan-beam z-axis position. A geometrical mask set is used to modify the response of conventional detector cells. Data from the masked detector cells are used to form a self-consistent normalized position signal which is independent of radiological dose
Keywords :
X-ray applications; biomedical measurement; computerised tomography; diagnostic radiography; medical image processing; position measurement; real-time systems; CT images; X-ray fan-beam z-axis position measurement; fan-beam orientation; fan-beam position control; fan-beam z-axis position; geometrical mask; image artifacts; masked detector cells; radiological dose; real-time measurement; Anatomy; Anodes; Attenuation; Collimators; Computed tomography; Face detection; Motion detection; Position measurement; Radiation detectors; X-ray imaging;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
