| US 7,564,035 B2 | ||
| Generating detector efficiency estimates for a pet scanner | ||
| Darren Hogg, Murrumbeena (Australia); and Kris Filip Johan Jules Thielemans, London (United Kingdom) | ||
| Assigned to Hammersmith Imanet Limited, London (United Kingdom) | ||
| Appl. No. 10/559,145 PCT Filed Jun. 03, 2004, PCT No. PCT/GB2004/002340 § 371(c)(1), (2), (4) Date May 05, 2006, PCT Pub. No. WO2004/109332, PCT Pub. Date Dec. 16, 2004. |
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| Claims priority of application No. 0312776.8 (GB), filed on Jun. 04, 2003. | ||
| Prior Publication US 2006/0249682 A1, Nov. 09, 2006 | ||
| Int. Cl. G01T 1/164 (2006.01) | ||
| U.S. Cl. 250—363.03 [250/363.04; 250/363.07; 250/363.09] | 19 Claims |
| 1. A method of generating detector efficiency data for a positron emission tomography scanner including:
a detector array for generating detection data; and
a single photon source,
a coincidence detection system for producing coincidence count data (Mij) in the detection data during an acquisition when a positron source is inside the scanner, and wherein the scanner is arranged
to produce artificial coincidence count data (M′ij) during an acquisition using the single photon source;
wherein the method comprises the steps of:
conducting an acquisition procedure using the single photon source to produce detection data;
generating artificial coincidence count data taking the position of the single photon source into account; and
processing said detection data using an efficiency estimation algorithm to calculate data representative of the efficiencies
of individual detectors in said array by processing said artificial coincidence count data, wherein the efficiency estimation
algorithm is based upon a measurement model which is additive, in that the measured model is related to a weighted sum of
individual efficiencies.
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