Real-time system for respiratory-cardiac gating in positron tomography
- Lawrence Berkeley National Lab., CA (United States). Center for Functional Imaging
- CTI, Inc., Knoxville, TN (United States)
A Macintosh-based signal processing system has been developed to support simultaneous respiratory and cardiac gating on the ECAT EXACT HR PET scanner. Using the Lab-View real-time software environment, the system reads analog inputs from a pneumatic respiratory bellows and an EGG monitor to compute an appropriate histogram memory location for the PET data. Respiratory state is determined by the bellows signal amplitude; cardiac state is based on the time since the last R-wave. These two states are used in a 2D lookup table to determine a combined respiratory-cardiac state. A 4-bit address encoding the selected histogram is directed from the system to the ECAT scanner, which dynamically switches the destination of tomograph events as respiratory-cardiac state changes. to Test the switching efficiency of the combined Macintosh/ECAT system, a rotating emission phantom was built. Acquisitions with 25 msec states while the phantom was rotating at 240 rpm demonstrate the system could effectively stop motion at this rate, with approximately 5 msec switching time between states.
- Sponsoring Organization:
- Department of Health and Human Services, Washington, DC (United States); USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 292928
- Report Number(s):
- CONF-971147-; ISSN 0018-9499; TRN: 99:001662
- Journal Information:
- IEEE Transactions on Nuclear Science, Vol. 45, Issue 4Pt2; Conference: Institute of Electrical and Electronic Engineers (IEEE) nuclear science symposium and medical imaging conference, Albuquerque, NM (United States), 11-13 Nov 1997; Other Information: PBD: Aug 1998
- Country of Publication:
- United States
- Language:
- English
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