Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1995-06-09
1997-03-04
Glick, Edward J.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
25036304, 250369, G01T 1161, G01T 1166
Patent
active
056082215
ABSTRACT:
A dual head nuclear camera system automatically switchable (and optimized) to perform either SPECT imaging or PET imaging that utilizes attenuation correction for nonuniform attenuation in SPECT or PET modes. The dual head detectors contain switchable triggering circuitry so that coincidence detection for PET imaging and non-coincidence detection for SPECT imaging is available. The system uses a variable integration technique with programmable integration interval; variable sized clusters for centroiding, use of dual integrators per PMT channel, the event detection and acquisition circuitry of the camera system is switchable for PET and SPECT imaging. In such a switchable SPECT/Pet dual head camera system, a mechanism and method is shown to perform transmission and emission scanning sessions with two line sources and two detectors wherein two sliding transmission detection windows are employed to differentiate between transmission and emission photons. Transmission and emission data can be collected simultaneously. This system provides that the dual transmission detection windows are each associated with a particular line source and move in synchronization. Further, the two line sources and the two detector windows all move in synchronization in the direction of the long axis of the object being scanned. In this configuration, the system can effectively reduce the amount of cross-talk detected by a detector.
REFERENCES:
Tanaka et al., "Engineering Aspects of a Hybrid Emission Computed Tomograph", IEEE Transactions on Nuclear Science, vol. NS-28, No. 1, 1981, pp. 137-141.
Hirose et al., "A Hybrid Emission CT-Headtome II", IEEE Transactions on Nuclear Science, vol. NS-29, No. 1, pp. 520-523, 1982.
Bailey et al., "Improved SPECT Using Simultaneous Emission and Transmission Tomography", Journal of Nuc. Med., vol. 28, No. 5, 1987, pp. 844-851.
Thompson et al., "Simultaneous Transmission and Emission Scans in Position Emission Tomography", IEEE Nuclear Science Symposium, 1988, pp. 1-6.
A. M. J. Paans, et al., "Performance Parameters of a Longitudinal Tomographic Positron Imaging System," reprinted from Nuclear Instruments & Methods, vol. 192, pp. 491-500 (1982).
G. Muehllehner, et al., "Performance of a Positron Imaging Camera," IEEE Transactions on Nuclear Science, vol. NS-23, No. 1, pp. 528-537 (Feb. 1976).
Bertelsen Hugo
Hines Horace H.
Murphy Matthew J.
Nellemann Peter
Wellnitz Donald R.
ADAC Laboratories
Glick Edward J.
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