US 11,835,669 B2
Method and system for PET detector efficiency normalization
Wenyuan Qi, Vernon Hills, IL (US); Yi Qiang, Vernon Hills, IL (US); Evren Asma, Vernon Hills, IL (US); Xiaoli Li, Vernon Hills, IL (US); Li Yang, Vernon Hills, IL (US); Peng Peng, Vernon Hills, IL (US); and Jeffrey Kolthammer, Vernon Hills, IL (US)
Assigned to CANON MEDICAL SYSTEMS CORPORATION, Tochigi (JP)
Filed by CANON MEDICAL SYSTEMS CORPORATION, Tochigi (JP)
Filed on Dec. 21, 2021, as Appl. No. 17/557,710.
Application 17/557,710 is a continuation of application No. 16/866,993, filed on May 5, 2020, granted, now 11,249,206.
Claims priority of provisional application 62/957,590, filed on Jan. 6, 2020.
Prior Publication US 2022/0113437 A1, Apr. 14, 2022
Int. Cl. G01T 1/29 (2006.01)
CPC G01T 1/2985 (2013.01) 10 Claims
OG exemplary drawing
 
1. A positron emission tomography (PET) apparatus, comprising:
a PET detector comprising a plurality of arrayed rings in each of which a plurality of detector crystals are arrayed; and
processing circuitry configured to
acquire a first crystal efficiency for each detector crystal of the plurality of detector crystals based on a measured gamma ray emitted from a line source, a second crystal efficiency for said each detector crystal of the plurality of detector crystals, which is calculated based on a simulation assuming a gamma ray emitted from a cylinder source, and a third crystal efficiency for said each detector crystal of the plurality of detector crystals, which is calculated based on a simulation assuming a gamma ray emitted from a line source, and
calculate a fourth crystal efficiency for said each detector crystal of the plurality of detector crystals based on the first crystal efficiency, the second crystal efficiency, and the third crystal efficiency.