Method and apparatus to improve CT image acquisition using a displaced geometry

US8379791B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Peter Forthmann · Latham, US
• Thomas Koehler · Norderstedt, DE
• Udo Van Stevendaal · Ahrensburg, DE
• Matthias Bertram · Aachen, DE
• Steffen Gunther Wiesner · Amsterdam, NL
• Colas Schretter · Grez-Doiceau, BE

Key dates

• Filing date: Oct 5, 2009
• Grant date: Feb 19, 2013
• Expiry date: Oct 5, 2029

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B6/027
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method and apparatus are provided to improve CT image acquisition using a displaced acquisition geometry. A CT apparatus may be used having a source (102) and a detector (104) transversely displaced from a center (114) of a field of view (118) during acquisition of the projection data. The amount of transverse displacement may be determined based on the size of the object (108). The source and the detector may be adjusted to vary the size of the transverse field of view. The first data set acquired by the detector may be reconstructed and used to simulate missing projection data that could not be acquired by the detector at each projection angle. The measured projection data and the simulated projection data may be used to obtain a second data set. The second data set may be compared to the first data set to produce a corrected data set.