Title :
Real-time X-ray fan beam z-axis position measurement
Author :
Gard, Michael F.
Author_Institution :
General Electric Med. Syst., Milwaukee, WS, USA
Abstract :
The control of fan beam z-axis position is important for the production of highest-quality computerized tomography (CT) images. The authors describe a special measurement technique that produces an accurate real-time analog measurement of the fan beam z-axis position using a set of triangular masks over conventional detector cells. Data obtained from the masked detector cells are normalized to make the position signal independent of radiological dose and collimator aperture setting. The resulting position signal is ideally suited for closed-loop fan beam position control
Keywords :
X-ray apparatus; X-ray applications; X-ray detection; biocontrol; closed loop systems; computerised tomography; position measurement; real-time systems; X-ray fan beam z-axis position measurement; closed-loop; collimator aperture setting; computerized tomography; control; masked detector cells; position control; position signal; radiological dose; real-time analog measurement; triangular masks; Apertures; Collimators; Computed tomography; Detectors; Face detection; Measurement techniques; Medical control systems; Position control; Position measurement; X-ray imaging;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1993. IMTC/93. Conference Record., IEEE
Conference_Location :
Irvine, CA
Print_ISBN :
0-7803-1229-5
DOI :
10.1109/IMTC.1993.382686
