US 11,860,320 B2
Gamma camera dead time determination in real time using long lived radioisotopes
Manojeet Bhattacharya, Chicago, IL (US)
Assigned to Siemens Medical Solutions USA, Inc., Malvern, PA (US)
Filed by Siemens Medical Solutions USA, Inc., Malvern, PA (US)
Filed on Dec. 9, 2021, as Appl. No. 17/643,460.
Application 17/643,460 is a division of application No. 15/315,107, granted, now 11,231,508, previously published as PCT/IB2015/054323, filed on Jun. 8, 2015.
Claims priority of provisional application 62/008,791, filed on Jun. 6, 2014.
Prior Publication US 2022/0099845 A1, Mar. 31, 2022
Int. Cl. G01T 1/17 (2006.01); A61B 6/03 (2006.01); G01T 1/161 (2006.01)
CPC G01T 1/171 (2013.01) [A61B 6/037 (2013.01); G01T 1/161 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A single photon emission computed tomography (SPECT) system comprising:
a gamma camera;
a shielded point source connected to emit radiation at the gamma camera;
detection electronics configured to detect emissions, including the radiation from the shielded point source and radioisotope emissions from a patient, a radioisotope of the shielded point source being different than any source of the radioisotope emissions from within the patient, and the detection electronics configured to detect the radiation during detection of the radioisotope emissions; and
a processor configured to correct for dead time of the detection electronics, the correction being a function of the detection of the radiation from the shielded point source and a constant known emission rate of the radiation of the radioisotope of the shielded point source.